48TC*D16Single Package RooftopGas Heating/Electric Cooling unitwith Puronr (R---410A) RefrigerantSize16

Installation InstructionsNOTE: Read the entire instruction manual before startingthe installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2. . . . . . . . . . . . . . . . . . . .

INSTALLATION 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Jobsite Survey 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 1 -- Plan for Unit Location 4. . . . . . . . . . . . . . . . . .

Roof Mount 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 2 -- Plan for Sequence of Unit Installation 5. . . . . .

Curb--Mount Installation 5. . . . . . . . . . . . . . . . . . . . .

Pad--Mount Installation 5. . . . . . . . . . . . . . . . . . . . . .

Frame--Mount Installation 5. . . . . . . . . . . . . . . . . . . .

Step 3 -- Inspect Unit 5. . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 4 -- Provide Unit Support 5. . . . . . . . . . . . . . . . . . .

Roof Curb Mount 5. . . . . . . . . . . . . . . . . . . . . . . . . .

Slab Mount (Horizontal Units Only) 5. . . . . . . . . . .

Alternate Unit Support(In Lieu of Curb or Slab Mount) 5. . . . . . . . . . . . . .

Step 5 -- Field Fabricate Ductwork 7. . . . . . . . . . . . . . . .

Step 6 -- Rig and Place Unit 7. . . . . . . . . . . . . . . . . . . . .

Positioning on Curb 8. . . . . . . . . . . . . . . . . . . . . . . .

Step 7 -- Convert to Horizontal & Connect Ductwork 8. .

Step 8 -- Install Outside Air Hood 9. . . . . . . . . . . . . . . .

Economizer Hood Removal and Setup 9. . . . . . . . .

Two Position Damper Hood Removal and Setup 9. . .

Economizer Hood and Two--Position Hood 10. . . . .

Step 9 -- Install Flue Hood 10. . . . . . . . . . . . . . . . . . . . .

Step 10 -- Install Gas Piping 11. . . . . . . . . . . . . . . . . . . .

Factory--Option Thru--Base Connections(Gas Connections) 11. . . . . . . . . . . . . . . . . . . . . . . . .

Step 11 -- Install External Condensate Trap and Line 13. .

Step 12 -- Make Electrical Connections 14. . . . . . . . . . .

Field Power Supply 14. . . . . . . . . . . . . . . . . . . . . . . .

All Units 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Units without Factory--Installed Disconnect 15. . . .

Units with Factory--Installed Disconnect 15. . . . . . .

Convenience Outlets 15. . . . . . . . . . . . . . . . . . . . . . .

Factory--Option Thru--Base Connections(Electrical Connections) 17. . . . . . . . . . . . . . . . . . . .

Units without Thru--Base Connections 18. . . . . . . . .

Field Control Wiring 18. . . . . . . . . . . . . . . . . . . . . . .

Thermostat 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit without Thru--Base Conversion Kit 18. . . . . . .

Heat Anticipator Settings 18. . . . . . . . . . . . . . . . . . .

PremierLinkt (Factory Option) 19. . . . . . . . . . . . . . . . .

Supply Air Temperature (SAT) Sensor 19. . . . . . . . .

Outdoor Air Temperature (OAT) Sensor 21. . . . . . .

EconoMi$er2 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Field Connections 21. . . . . . . . . . . . . . . . . . . . . . . . . .

Space Sensors 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connect Thermostat 21. . . . . . . . . . . . . . . . . . . . . . .

Configure the Unit for Thermostat Mode 24. . . . . .

Economizer Controls 24. . . . . . . . . . . . . . . . . . . . . . . .

Indoor Air Quality (CO2 sensor) 24. . . . . . . . . . . . .

Outdoor Air Quality Sensor 24. . . . . . . . . . . . . . . . .

Smoke Detector/Fire Shutdown (FSD) 25. . . . . . . . .

Filter Status Switch 25. . . . . . . . . . . . . . . . . . . . . . . .

Supply Fan Status Switch 25. . . . . . . . . . . . . . . . . . .

Remote Occupied Switch 25. . . . . . . . . . . . . . . . . . .

Space Relative Humidity Sensor 26. . . . . . . . . . . . .

Power Exhaust (output) 26. . . . . . . . . . . . . . . . . . . . .

CCN Communication Bus 26. . . . . . . . . . . . . . . . . .

RTU Open Control System 27. . . . . . . . . . . . . . . . . . . . .

Supply Air Temperature (SAT) Sensor 29. . . . . . . . .

Outdoor Air Temperature (OAT) Sensor 29. . . . . . .

EconoMi$er2 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Field Connections 29. . . . . . . . . . . . . . . . . . . . . . . . . .

Space Temperature (SPT) Sensors 30. . . . . . . . . . . .

Indoor Air Quality (CO2) Sensor 30. . . . . . . . . . . . .

Outdoor Air Quality Sensor 31. . . . . . . . . . . . . . . . .

Connecting Discrete Inputs 31. . . . . . . . . . . . . . . . . .

2

Communication Wiring -- Protocols 32. . . . . . . . . . . .

General 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Local Access 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RTU Open Troubleshooting 33. . . . . . . . . . . . . . . . .

Outdoor Air Enthalpy Control 34. . . . . . . . . . . . . . . . .

Differential Enthalpy Control 34. . . . . . . . . . . . . . . .

Return Air Enthalpy Sensor 34. . . . . . . . . . . . . . . . .

Smoke Detectors 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Controller 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sensor Module 35. . . . . . . . . . . . . . . . . . . . . . . . . . .

Smoke Detector Locations 36. . . . . . . . . . . . . . . . . . . .

Supply Air 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Return Air without Economizer 36. . . . . . . . . . . . . .

Return Air with Economizer 36. . . . . . . . . . . . . . . . .

Step 13 -- Adjust Factory--Installed Options 39. . . . . . . .

Step 14 -- Install Accessories 39. . . . . . . . . . . . . . . . . . .

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock or other conditions which may cause personalinjury or property damage. Consult a qualified installer,service agency, or your distributor or branch forinformation or assistance. The qualified installer oragency must use factory--authorized kits or accessorieswhen modifying this product. Refer to the individualinstructions packaged with the kits or accessories wheninstalling.

Follow all safety codes. Wear safety glasses and workgloves. Use quenching cloths for brazing operations andhave a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions attached tothe unit. Consult local building codes and appropriatenational electrical codes (in USA, ANSI/NFPA70,National Electrical Code (NEC); in Canada, CSA C22.1)for special requirements.

It is important to recognize safety information. This is the

safety--alert symbol . When you see this symbol on theunit and in instructions or manuals, be alert to thepotential for personal injury.

Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety--alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury ordeath. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identifyunsafe practices, which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personalinjury or death.

Disconnect gas piping from unit when leak testing atpressure greater than 0.5 psig (3450 Pa). Pressuresgreater than 0.5 psig (3450 Pa) will cause gas valvedamage resulting in hazardous condition. If gas valveis subjected to pressure greater than 0.5 psig (3450Pa), it must be replaced before use. When pressuretesting field--supplied gas piping at pressures of 0.5psig (3450 Pa) or less, a unit connected to such pipingmust be isolated by closing the manual gas valve.

! WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personalinjury or death.

Before performing service or maintenance operationson unit, always turn off main power switch to unit andinstall lockout tag. Unit may have more than onepower switch.

! WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personalinjury, death and/or equipment damage.

Puronr (R--410A) refrigerant systems operate athigher pressures than standard R--22 systems. Do notuse R--22 service equipment or components on Puronrefrigerant equipment.

! WARNING

PERSONAL INJURY AND ENVIRONMENTALHAZARD

Failure to follow this warning could cause personalinjury or death.

Relieve pressure and recover all refrigerant beforesystem repair or final unit disposal.

Wear safety glasses and gloves when handlingrefrigerants. Keep torches and other ignition sourcesaway from refrigerants and oils.

! WARNING

CUT HAZARDFailure to follow this caution may result in personalinjury.Sheet metal parts may have sharp edges or burrs. Usecare and wear appropriate protective clothing, safetyglasses and gloves when handling parts and servicingair conditioning equipment.

CAUTION!

48TC*D16

3

Horizontal Connections / Economizer

Vertical Connections / Economizer

C10864AFig. 1 -- Unit Dimensional Drawing – 16 Size Unit

48TC*D16

4

C10862AFig. 1 -- Unit Dimensional Drawing – 16 Size Unit (cont.)

INSTALLATIONJobsite Survey

Complete the following checks before installation.

1. Consult local building codes and the NEC (NationalElectrical Code) ANSI/NFPA 70 for special installa-tion requirements.

2. Determine unit location (from project plans) or selectunit location.

3. Check for possible overhead obstructions which mayinterfere with unit lifting or rigging.

Step 1 — Plan for Unit Location

Select a location for the unit and its support system (curbor other) that provides for at least the minimum clearancesrequired for safety. This includes the clearance tocombustible surfaces, unit performance and service accessbelow, around and above unit as specified in unitdrawings. See Fig. 2.

NOTE: Consider also the effect of adjacent units.

Unit may be installed directly on wood flooring or on ClassA, B, or C roof--covering material when roof curb is used

Do not install unit in an indoor location. Do not locate airinlets near exhaust vents, relief valves, or other sources ofcontaminated air.

18”(457) * 42"

(1067)

* Required bottom condensate drain connection. Otherwise, 36” (914mm) for condensate connection.

42"(1067)

42"(1067)

C09897

Fig. 2 -- Service Clearance Dimensional Drawing

Although unit is weatherproof, avoid locations that permitwater from higher level runoff and overhangs to fall ontothe unit.

Select a unit mounting system that provides adequateheight to allow for removal and disposal of frost and icethat will form during the heating--defrost mode as well asallow installation of condensate trap per requirements.Refer to Step 11 — Install External Condensate Trap andLine – for required trap dimensions.

48TC*D16

5

Roof Mount —

Check building codes for weight distributionrequirements. Unit operating weight is shown in Table 1.

Table 1 – Operating Weights

48TC*D16COMPONENT UNITS LB (KG)Base Unit 1380 (627)

Economizer

Vertical 100 (45)

Horizontal 115 (52)

Powered Outlet 32 (15)

Curb

14--- in/356 mm 180 (82)

24--- in/610 mm 235 (107)

Step 2 — Plan for Sequence of Unit Installation

The support method used for this unit will dictate differentsequences for the steps of unit installation. For example,on curb--mounted units, some accessories must beinstalled on the unit before the unit is placed on the curb.Review the following for recommended sequences forinstallation steps.

Curb--mounted installation —

Install curb, making sure to position the common crossrail (see Fig. 3) for large duct opening.Install field--fabricated ductwork inside curbComplete installation of the factory--installedthru--the--base service connection optionPrepare bottom condensate drain connection to suitplanned condensate line routing (refer to Step 9 fordetails)Rig and place unitInstall outdoor air hoodInstall condensate line trap and pipingMake electrical connectionsInstall other accessories

Pad--mounted installation —

Prepare pad and unit supportsCheck and tighten the bottom condensate drainconnection plugRig and place unitConvert unit to side duct connection arrangementInstall field--fabricated ductwork at unit duct openingsInstall outdoor air hoodInstall condensate line trap and pipingMake electrical connectionsInstall other accessories

Frame--mounted installation —

Frame--mounted applications generally follow thesequence for a curb installation. Adapt as required tosuit specific installation plan.

Step 3 — Inspect Unit

Inspect unit for transportation damage. File any claimwith transportation agency.

Confirm before installation of unit that voltage, amperageand circuit protection requirements listed on unit dataplate agree with power supply provided.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown inFig. 3. Assemble and install accessory roof curb inaccordance with instructions shipped with the curb.

NOTE: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket supplied withthe roof curb as shown in Fig. 3. Improperly appliedgasket can also result in air leaks and poor unitperformance.

Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are show inFig. 4. Refer to Accessory Roof Curb InstallationInstructions for additional information as required.

Install insulation, cant strips, roofing felt, and counterflashing as shown. Ductwork must be attached to curb andnot to the unit.

IMPORTANT:

If the unit’s gas connection and/or electric and controlwiring is to be routed through the basepan and the unitis equipped with the factory--installed Thru--the--Baseservice option see the following sections:

S Factory--Option Thru--Base Connections(Gas Connection) on page 11

S Factory--Option Thru--Base Connections(Electrical Connections) on page 17

If using the field--installed Thru--the--Base accessoryfollow the instructions provided with the accessory kit.

NOTE: If gas and/or electrical connections are notgoing to occur at this time, tape or otherwise cover thefittings so that moisture does not get into the building orconduit in the interim.

Slab Mount (Horizontal Units Only) —

Provide a level concrete slab that extends a minimum of6 in. (150 mm) beyond unit cabinet. Install a gravel apronin front of condenser coil air inlet to prevent grass andfoliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curbif required.

Alternate Unit Support (In Lieu of Curb or SlabMount) —

A non--combustible sleeper rail can be used in the unit curbsupport area. If sleeper rails cannot be used, support the longsides of the unit with a minimum of 3 equally spaced 4--in. x4--in. (102 mm x 102 mm) pads on each side.

48TC*D16

6

C10772Fig. 3 -- Roof Curb Details

48TC*D16

7

A-B0.5” (13)

B-C1.0” (25)

A-C1.0” (25)

MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)

A

B

C

C10001

Fig. 4 -- Unit Leveling Tolerances

Step 5 — Field Fabricate DuctworkNOTE: Cabinet return-air static pressure (a negativecondition) shall not exceed 0.35 in. wg (87 Pa) witheconomizer or 0.45 in. wg (112 Pa) without economizer.

For vertical ducted applications, secure all ducts to roof curband building structure. Do not connect ductwork to unit.

Insulate and weatherproof all external ductwork, joints,and roof openings with counter flashing and mastic inaccordance with applicable codes.

Ducts passing through unconditioned spaces must beinsulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the returnshould be ducted through the roof deck to comply withapplicable fire codes.

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in damageto roofing materials.

Membrane roofs can be cut by sharp sheet metaledges. Be careful when placing any sheet metal partson such roof.

CAUTION!

Step 6 — Rig and Place Unit

When the unit is ready to be rigged and no longer will belifted by a fork truck, the wood protector under the basepanmust be removed. Remove 4 screws from each base rail.Wood protector will drop to the ground. See instructions onthe unit base rails.

Keep unit upright and do not drop. Spreader bars arerequired. Rollers may be used to move unit across a roof.Level by using unit frame as a reference. See Table 1 andFig. 5 for additional information.

Lifting holes are provided in base rails as shown in Fig. 5.Refer to rigging instructions on unit.

UNIT DAMAGE HAZARD

Failure to follow this caution may result inequipment damage.

All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.

CAUTION!

Before setting the unit onto the curb, recheck gasketing oncurb.

DETAIL “A”

PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING UNIT ON ROOF CURB.

DUCT END

SEE DETAIL “A”

914 - 1371( 36” - 54” )“B”

“A”

“C”

C10774

UNITMAX WEIGHT

DIMENSIONSA B C

LB KG IN MM IN MM IN MM48TC*D16 2130 968 116.0 2945 60.5 1535 59.5 1510

NOTES:1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.2. Dimensions in ( ) are in millimeters.3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered aroundthe unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 5 -- Rigging Details

48TC*D16

8

Positioning on Curb —

For full perimeter curbs CRRFCURB074A00 and 075A00,the clearance between the roof curb and the front and rearbase rails should be 1/4 in (6.4 mm). The clearance betweenthe curb and the end base rails should be 1/2 in (13 mm). Forretrofit applications with curbs CRRFCURB003A01 and4A01, the unit should be position as shown in Fig. 6.Maintain the 15.5 in (394 mm) and 8 5/8 in (220 mm)clearances and allow the 22 5/16 in (567 mm) dimension tofloat if necessary.

C10003

Fig. 6 -- Retrofit Installation Dimensions

If the alternative condensate drain location through thebottom of the unit is used in conjunction with a retrofitcurb, the hole in the curb must be moved 12.5 in (320mm) towards the duct end of the unit. (See Fig. 7.)

Original Position

New Position(moved 12.5 in.)

C10904

Fig. 7 -- Alternative Condensate Drain Hole Positions

Although unit is weatherproof, guard against water fromhigher level runoff and overhangs.

IMPORTANT:

If the unit has the factory--installed Thru--the--Baseoption, make sure to complete installation of the optionbefore placing the unit on the roof curb.

See the following sections:

S Factory--Option Thru--Base Connections(Gas Connection) on page 11

S Factory--Option Thru--Base Connections(Electrical Connections) on page 17

NOTE: If gas and/or electrical connections are notgoing to occur at this time, tape or otherwise cover thefittings so that moisture does not get into the building orconduit in the interim.

Remove all shipping materials and top skid. Remove extracenter post from the condenser end of the unit so that thecondenser end of the unit matches Fig. 24 and 25. Recycleor dispose of all shipping materials.

Step 7 — Convert to Horizontal and ConnectDuctwork (when required)

Unit is shipped in the vertical duct configuration. Unitwithout factory--installed economizer or return air smokedetector option may be field--converted to horizontal ductedconfiguration using accessory CRDUCTCV001A00. Toconvert to horizontal configuration, remove screws from sideduct opening covers and remove covers.

Discard the supply duct cover. Install accessoryCRDUCTCV001A00 to cover the vertical supply ductopening. Use the return duct cover removed from the endpanel to cover the vertical return duct opening.

Field--supplied flanges should be attached to horizontalduct openings and all ductwork should be secured to theflanges. Insulate and weatherproof all external ductwork,joints, and roof or building openings with counter flashingand mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informativedata plate when insulating horizontal ductwork.

C06108

Fig. 8 -- Horizontal Conversion Panels

48TC*D16

9

Step 8 — Install Outside Air Hood

Economizer Hood Removal and Setup --Factory Option —

1. The hood is shipped in knock--down form and locatedin the return air compartment. It is attached to theeconomizer using two plastic tie--wraps.

2. To gain access to the hood, remove the filter accesspanel. (See Fig. 9.)

3. Locate and cut the (2) plastic tie--wraps, being carefulto not damage any wiring. (See Fig. 10.)

4. Carefully lift the hood assembly through the filteraccess opening and assemble per the steps outlined inEconomizer Hood and Two–Position Hood on page 10.

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C10004

Fig. 9 -- Typical Access Panel Locations

Economizer

Cut Plastic Ties(2) Places

Remove Hood Parts

C10005

Fig. 10 -- Economizer Hood Package Location

Two Position Damper Hood Removal and Setup --Factory Option —

1. The hood is shipped in knock--down form andassembled to a metal support tray using plastic stretchwrap. Located in the return air compartment, theassembly’s metal tray is attached to the basepan andalso attached to the damper using two plastictie--wraps.

2. To gain access to the hood, remove the filter accesspanel. (See Fig. 9.)

3. Locate the (2) screws holding the metal tray to thebasepan and remove. In order to remove the screws, itmay be necessary to remove the panel underneath thetwo--position damper. Remove the two screws. Locateand cut the (2) plastic tie--wraps securing theassembly to the damper. (See Fig. 11.) Be careful tonot damage any wiring or cut tie--wraps securing anywiring.

4. Carefully lift the hood assembly (with metal tray)through the filter access opening and assemble per thesteps outlined in Economizer Hood and Two–PositionHood on page 10.

5. If removed, reattach the panel under the damper.

Hood Parts

Plastic Tie WrapQty (2)

Screws for Metal TrayQty (2)

C10006

Fig. 11 -- Two--Position Damper Hood Package Location

48TC*D16

10

Economizer Hood and Two--Position Hood —

NOTE: If the power exhaust accessory is to be installedon the unit, the hood shipped with the unit will not beused and must be discarded. Save the aluminum filter foruse in the power exhaust hood assembly.

1. The indoor coil access panel will be used as the top ofthe hood. If the panel is still attached to the unit, re-move the screws along the sides and bottom of thepanel. See Fig. 12.

SIDEPANEL

INDOORCOILACCESSPANEL

INDOORCOILACCESSPANEL

CAULKHERE

TOPPANEL

RAIN DEFLECTORS

C10007

Fig. 12 -- Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert thehood sides under the panel (hood top). Be careful notto lift the panel too far as it might fall out. Use thescrews provided to attach the hood sides to the hoodtop. Use screws provided to attach the hood sides tothe unit. See Fig. 13.

TOPPANEL

INDOOR COILACCESS PANEL

SCREW

HOOD DIVIDER

LEFTHOODSIDE

C10008

Fig. 13 -- Economizer Hood Construction

3. Remove the shipping tape holding the economizerbarometric relief damper in place.

4. Insert the hood divider between the hood sides. SeeFig. 13 and 14. Secure hood divider with 3 screws oneach hood side. The hood divider is also used as thebottom filter rack for the aluminum filter.

5. Attach the post that separates the filters with thescrews provided.

6. Open the filter clips which are located underneath thehood top. Insert the aluminum filters into the bottomfilter rack (hood divider). Push the filter into positionpast the open filter clips. Close the filter clips to lockthe filters into place. See Fig. 14.

7. Install the two rain deflectors on the edge of the hoodtop as shown in Fig. 12.

DIVIDER

BAROMETRICRELIEF

CLEANABLEALUMINUMFILTER

FILTER

HOOD

FILTERCLIP

OUTSIDEAIR

C10009

Fig. 14 -- Economizer Filter Installation

8. Caulk the ends of the joint between the unit top paneland the hood top as shown in Fig. 12.

9. Replace the filter access panel.

Step 9 — Install Flue HoodThe flue hood is shipped screwed to the basepan besidethe burner compartment access panel. Remove the panelbelow the control box access panel to access the flue hoodshipping location. Using screws provided, install fluehood and screen in location shown in Fig. 15.

FLUEHOOD

CONTROL BOXACCESS PANEL

C10804

Fig. 15 -- Flue Hood Details

48TC*D16

11

Step 10 — Install Gas PipingInstallation of the gas piping must be accordance withlocal building codes and with applicable national codes.In U.S.A., refer to NFPA 54/ANSI Z223.1 National FuelGas Code (NFGC). In Canada, installation must beaccordance with the CAN/CSA B149.1 and CAN/CSAB149.2 installation codes for gas burning appliances.This unit is factory equipped for use with Natural Gas fuelat elevations up to 2000 ft (610 m) above sea level. Unitmay be field converted for operation at elevations above2000 ft (610 m) and/or for use with liquefied petroleumfuel. See accessory kit installation instructions regardingthese accessories.NOTE: In U.S.A. the input rating for altitudes above 2000ft (610 m) must be derated by 4% for each 1000 ft (305 m)above sea level. In Canada the input rating must be deratedby 10% for altitudes of 2000 ft (610 m) to 4500 ft. (1372 m)above sea level.For natural gas applications, gas pressure at unit gasconnection must not be less than 5 in. wg (1250 Pa) orgreater than 13 in. wg (3240 Pa) while the unit is operating.For liquified petroleum applications, the gas pressure mustnot be less than 11 in. wg (2740 Pa) or greater than 13 in.wg (3240 Pa) at the unit connection.The gas supply pipe enters the unit at the burner accesspanel on the front side of the unit, through the long slot atthe bottom of the access panel. The gas connection to theunit is made to the 3/4--in. FPT gas inlet port on the unit gasvalve.

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damageto equipment.

When connecting the gas line to the unit gas valve,the installer MUST use a backup wrench to preventdamage to the valve.

CAUTION!

Install a gas supply line that runs to the unit heatingsection. Refer to the NFPA 54/NFGC or equivalent codefor gas pipe sizing data. Size the gas supply line to allowfor a maximum pressure drop of 0.5--in wg (124 Pa)between gas regulator source and unit gas valveconnection when unit is operating at high--fire flow rate.The gas supply line can approach the unit in three ways:horizontally from outside the unit (across the roof),thru--curb/under unit basepan (accessory kit required) orthrough unit basepan (factory--option or accessory kitrequired). Consult accessory kit installation instructionsfor details on these installation methods.

Factory--Option Thru--Base Connections(Gas Connection) —

This service connection kit consists of a 3/4--in NPT gasadapter fitting (stainless steel), a 1/2--in electrical bulkheadconnector and a 11/2--in electrical bulkhead connector,connected to an “L” bracket covering the embossed(raised) section of the unit basepan in the condensersection. See Fig. 16.

11/2” ELECTRICAL BULKHEADCONNECTOR

1/2” ELECTRICAL BULKHEADCONNECTOR

3/4” NPT GASADAPTERFITTING

C10905

Fig. 16 -- Thru--the--Base Option, Shipping Position

1. Remove the “L” bracket assembly from the unit (seeFig. 16).

2. Cut and discard the wire tie on the gas fitting. Handtighten the fitting if it has loosened in transit.

3. Remove connector plate assembly from the “L”bracket and discard the “L” bracket, but retain thewasher head screws and the gasket (located betweenthe “L” bracket and the connector plate assembly

NOTE: Take care not to damage the gasket, as it isreused in the following step.

4. Place the gasket over the embossed area in thebasepan, aligning the holes in the gasket to the holesin the basepan. See Fig. 17.

5. Install the connector plate assembly to the basepanusing 8 of the washer head screws.

NOTE: If gas and/or electrical connections are not going tooccur at this time, tape or otherwise cover the fittings so thatmoisture does not get into the building or conduit in theinterim.

GASKET

CONNECTORPLATEASSEMBLY

C10906

Fig. 17 -- Completing Installation of Thru--the--BaseOption

The thru--base gas connector has male and female threads.The male threads protrude above the basepan of the unit;the female threads protrude below the basepan.

48TC*D16

12

Check tightness of connector lock nuts before connectinggas piping.Install a 3/4--in NPT street elbow (field--supplied) on thethru--base gas fitting. Attach a 3/4--in pipe nipple withminimum length of 16--in (406 mm) (field--supplied) tothe street elbow and extend it through the access panel atthe gas support bracket. (See Fig. 18.)

3/4-in NPTSTREETELBOW

THRU-BASEGAS FITTING

GASSUPPORTBRACKET

C10806

Fig. 18 -- Gas Line Piping

Other hardware required to complete the installation ofthe gas supply line will include a manual shutoff valve, asediment trap (drip leg) and a ground--joint union. Apressure regulator valve may also be required (to convertgas pressure from pounds to inches of pressure). Themanual shutoff valve must be located within 6--ft (1.83 m)of the unit. The union, located in the final leg entering theunit, must be located at least 9--in (230 mm) away fromthe access panel to permit the panel to be removed forservice. If a regulator valve is installed, it must be locateda minimum of 4--ft (1220 mm) away from the unit’s flueoutlet. Some municipal codes require that the manualshutoff valve be located upstream of the sediment trap.See Fig. 19 and 20 for typical piping arrangements for gaspiping that has been routed through the sidewall of thecurb. See Fig. 21 for typical piping arrangement whenthru--base is used. Ensure that all piping does not blockaccess to the unit’s main control box or limit the requiredworking space in front of the control box.

9” (229mm) min

Union

Shut OffValve

DripLeg

Thru-Curb Adapter

Unit Base Rail

C07469

Fig. 19 -- Gas Piping

DripLeg

Shut OffValve

Union

Thru-Curb Adapter

BurnerAccessPanel

9” (229mm) min

Unit Base Rail

C07470

Fig. 20 -- Gas Piping

C10826

Fig. 21 -- Gas Piping Thru--Base Connections

When installing the gas supply line, observe local codespertaining to gas pipe installations. Refer to the NFPA54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSAB149.1). In the absence of local building codes, adhere tothe following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe1/4--in. in every 15 ft (7 mm in every 5 m) to preventtraps. Grade all horizontal runs downward to risers.Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physicaland thermal damage. Support all piping with appro-priate straps, hangers, etc. Use a minimum of onehanger every 8 ft (2.4 m). For pipe sizes larger than3/4--in., follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and onlyto male threads of joint when making pipe connec-tions. Use only pipe dope that is resistant to action ofliquefied petroleum gases as specified by local and/ornational codes. If using PTFE (Teflon) tape, ensurethe material is Double Density type and is labeled foruse on gas lines. Apply tape per manufacturer’s in-structions.

4. Pressure--test all gas piping in accordance with localand national plumbing and gas codes before connect-ing piping to unit.

48TC*D16

13

NOTE: Pressure test the gas supply system after the gassupply piping is connected to the gas valve. The supplypiping must be disconnected from the gas valve during thetesting of the piping systems when test pressure is inexcess of 0.5 psig (3450 Pa). Pressure test the gas supplypiping system at pressures equal to or less than 0.5 psig(3450 Pa). The unit heating section must be isolated fromthe gas piping system by closing the external main manualshutoff valve and slightly opening the ground--joint union.

Check for gas leaks at the field--installed andfactory--installed gas lines after all piping connectionshave been completed. Use soap--and--water solution (ormethod specified by local codes and/or regulations).

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personalinjury, death and/or property damage.

S Connect gas pipe to unit using a backup wrench toavoid damaging gas controls.

S Never purge a gas line into a combustion chamber.S Never test for gas leaks with an open flame. Use a

commercially available soap solution madespecifically for the detection of leaks to check allconnections.

S Use proper length of pipe to avoid stress on gascontrol manifold.

! WARNING

BURNER ORIFICE

A93059

Fig. 22 -- Orifice Hole

NOTE: If orifice hole appears damaged or it is suspectedto have been re--drilled, check orifice hole with anumbered drill bit of correct size. Never re--drill anorifice. A burr--free and squarely aligned orifice hole isessential for proper flame characteristics. See Fig. 22.

Step 11 — Install External Condensate Trap andLine

The unit has one 3/4-in. condensate drain connection onthe end of the condensate pan and an alternate connectionon the bottom. See Fig. 23. Unit airflow configurationdoes not determine which drain connection to use. Eitherdrain connection can be used with vertical or horizontalapplications.

When using the standard side drain connection, ensure thered plug in the alternate bottom connection is tight. Dothis before setting the unit in place. The red drain pan canbe tightened with a 1/2--in. square socket drive extension.

To use the alternate bottom drain connection, remove thered drain plug from the bottom connection (use a 1/2--in.square socket drive extension) and install it in the sidedrain connection.

DRAIN(FACTORY-INSTALLED)

PLUG

CONDENSATE PAN (SIDE VIEW)

STANDARDSIDE DRAIN

ALTERNATEBOTTOM DRAIN

C08021

Fig. 23 -- Condensate Drain Pan (Side View)

The piping for the condensate drain and external trap canbe completed after the unit is in place. See Fig. 24.

NOTE: Trap should be deep enough to offset maximum unit staticdifference. A 4” (102) trap is recommended.

MINIMUM PITCH1” (25mm) PER10’ (3m) OF LINE

BASE RAIL

OPENVENT

TO ROOFDRAIN

DRAIN PLUG

ROOFCURB

SEE NOTE

2˝ (51) MIN

C08022

Fig. 24 -- Condensate Drain Piping Details

All units must have an external trap for condensatedrainage. Install a trap at least 4-in. (102 mm) deep andprotect against freeze-up. If drain line is installeddownstream from the external trap, pitch the line awayfrom the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Donot use a pipe size smaller than the unit connection(3/4-in.).

48TC*D16

14

Step 12 — Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personalinjury or death.

Do not use gas piping as an electrical ground. Unitcabinet must have an uninterrupted, unbroken electricalground to minimize the possibility of personal injury ifan electrical fault should occur. This ground may consistof electrical wire connected to unit ground lug in controlcompartment, or conduit approved for electrical groundwhen installed in accordance with NEC (NationalElectrical Code); ANSI/NFPA 70, latest edition (inCanada, Canadian Electrical Code CSA [CanadianStandards Association] C22.1), and local electricalcodes.

! WARNING

NOTE: Check all factory and field electrical connectionsfor tightness. Field--supplied wiring shall conform withthe limitations of 63_F (33_C) rise.

Field Power Supply —

For those units without through--the--curb power, conduitmust be used to route the main power from the condenserend, via the power entry in the corner post of the unit (seeFig. 25 and 26) to either the factory option disconnect or thebottom of the control box. 1” conduit is provided wrappedaround compressor. A second conduit is provided withfactory installed powered convenience outlet. For those unitsthat require conduit larger than 1”, it must be field supplied.Fig 25 and 26 show the wire routings.

C10884Fig. 25 -- Conduit into Factory Option Disconnect

C10885

Fig. 26 -- Conduit into Control Box

If the field disconnect is larger than 100A, it must beattached to the unit using accessory CRDISBKT001A00— disconnect switch bracket — (see Fig. 27). Follow theinstructions provided with this accessory. For smaller fielddisconnects, be sure to use 1/2” screws to mount thedisconnect directly to the end panel (see Fig. 28). In eithercase, set the disconnect vertical location on the unit sothat a 90_ fitting can be used to connect the conduit to thedisconnect.

Field power wires are connected to the unit at line--sidepressure lugs at the main terminal block (TB1) or atfactory--installed option non--fused disconnect switch.Max wire size is #2 AWG (copper only). (See Fig. 30.)

C10853

Fig. 27 -- Mounting Position for Field Disconnects(over 100A)

C10854

Fig. 28 -- Mounting Position for Field Disconnects(up to 100A)

NOTE: TEST LEADS -- Unit may be equipped withshort leads (pigtails) on the field line connection points offthe optional disconnect switch. These leads are for factoryrun--test purposes only; remove and discard before

48TC*D16

15

connecting field power wires to unit connection points.Make field power connections directly to line connectionpressure lugs only.

FIRE HAZARDFailure to follow this warning could result inintermittent operation or performance satisfaction.Do not connect aluminum wire between disconnectswitch and unit. Use only copper wire.(See Fig. 29.)

! WARNING

COPPER

WIRE ONLY

ELECTRICDISCONNECT

SWITCH

ALUMINUMWIRE

A93033

Fig. 29 -- Disconnect Switch and Unit

All Units —

All field wiring must comply with the NEC and localrequirements.

Size wire based on MCA (Minimum Circuit Amps) on theunit informative plate. See Fig. 30 and the unit labeldiagram for power wiring connections to the unit powerterminal blocks and equipment ground. Maximum wiresize is 2/0 AWG per pole.

Provide a ground--fault and short--circuit over--currentprotection device (fuse or breaker) per NEC Article 440(or local codes). Refer to unit informative data plate forMOCP (Maximum Over--current Protection) device size.

Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. SeeTable 9. On 3--phase units, voltages between phases mustbe balanced within 2% and the current within 10%. Usethe formula shown in the legend for Table 9 (see Note 2on page 38) to determine the percent of voltageimbalance.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipmentdamage.

Operation on improper line voltage or excessive phaseimbalance constitutes abuse and may cause damage toelectrical components. Such operation would invalidateany applicable Carrier warranty.

CAUTION!

Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch ofadequate size per NEC (National Electrical Code).Disconnect sizing data is provided on the unit informativeplate. Locate on unit cabinet or within sight of the unit pernational or local codes. Do not cover unit informativeplate if mounting the disconnect on the unit cabinet.

Units with Factory--Installed Disconnect —

The factory--installed option disconnect switch is located in aweatherproof enclosure located under the main control box.The manual switch handle is accessible through an openingin the access panel. Discard the factory test leads (see Fig.30). The factory disconnect is an 80A disconnect.

Units Without Disconnect Option

Units With Disconnect Option

2

4

6

1

3

5

L1

L2

L3

OptionalDisconnect

Switch

Disconnect factory test leads; discard.

FactoryWiring

11 12 13

L1 L2 L3

TB1

208/230-3-60460-3-60575-3-60

Disconnectper

NEC

C10015

Fig. 30 -- Power Wiring Connections

Convenience Outlets —

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipmentdamage.

Operation on improper line voltage or excessive phaseimbalance constitutes abuse and may cause damage toelectrical components. Such operation would invalidateany applicable Carrier warranty.

CAUTION!

Two types of convenience outlets are offered on the48TC*D16 : non--powered and unit--powered. Both typesprovide a 125--volt GFCI (ground--fault circuit--interrupter)duplex receptacle rated at 15--A behind a hinged waterproofaccess cover, located on the panel beneath the control box.See Fig. 31.

48TC*D16

16

ConvenienceOutletGFCI

Pwd-COFuse Switch

Pwd-COTransformer

DisconnectAccess Panel

C10361

Fig. 31 -- Convenience Outlet Location

Non--powered type: This type requires the fieldinstallation of a general--purpose 125--volt 15--A circuitpowered from a source elsewhere in the building. Observenational and local codes when selecting wire size andconduit requirements, fuse or breaker requirements anddisconnect switch size and location. Route 125--v powersupply conductors into the bottom of the utility boxcontaining the duplex receptacle.

Unit--powered type: A unit--mounted transformer isfactory--installed to stepdown the main power supplyvoltage to the unit to 115--v at the duplex receptacle. Thisoption also includes a manual switch with fuse, located ina utility box and mounted on a bracket behind theconvenience outlet; access is through the panel beneaththe control box. See Fig. 31.

The primary leads to the convenience outlet transformerare not factory--connected. Selection of primary powersource is a customer--option. If local codes permit, thetransformer primary leads can be connected at theline--side terminals on the unit--mounted non--fuseddisconnect; this will provide service power to the unitwhen the unit disconnect switch is open. Other connectionmethods will result in the convenience outlet circuit beingde--energized when the unit disconnect switch is open. SeeFig. 33. On a unit without a unit--mounted disconnect,connect the source leads to the main terminal block(TB1).

If the convenience outlet transformer is connected to theline side of a field disconnect, the conduit provided withthe unit must be used to protect the wire as they are routedfrom the transformer to the field disconnect. The end ofthe conduit with the straight connector attaches to thefield disconnect. The other end does not need to connectto the transformer; however, the conduit must be routed sothat all wiring is either in the conduit or behind the accesspanel.

If the convenience outlet transformer is connected to theline side of the factory disconnect option, route the wiresthrough the web bushing located on the bottom of thedisconnect box. For the load side wiring to the factoryoption disconnect, route the wires through the hole on theright side of the disconnect. Be sure to create a drip loopat least 6” long.

2.050HE501288

NOTICE/AVISConvenience Outlet Utilization

Maximum Intermittent Use 15 - AmpsMaximum Continuous Use 8 - Amps

Observe a 50% limit on the circuitLoading above 8 - Amps

Utilisation de la prise utilitaireUsage intermittent maximum 15 - Amps

Usage continu maximum 8 - AmpsObservez une limite de 50% sur le circuit

Chargement au-dessus de 8 - Amps

C10077Fig. 32 -- Convenience Outlet Utilization Notice

Test the GFCI receptacle by pressing the TEST button onthe face of the receptacle to trip and open the receptacle.Check for proper grounding wires and power line phasingif the GFCI receptacle does not trip as required. Press theRESET button to clear the tripped condition.

C08283

UNITVOLTAGE

CONNECTAS

PRIMARYCONNECTIONS

TRANSFORMERTERMINALS

208,230 240 L1: RED +YEL

L2: BLU + GRAH1 + H3H2 + H4

460 480L1: REDSplice BLU + YELL2: GRA

H1H2 + H3H4

575 600 L1: REDL2: GRA

H1H2

Fig. 33 -- Unit Powered Convenience Outlet Wiring

Fuse on power type: The factory fuse is a Bussman“Fusetron” T--15, non--renewable screw--in (Edison base)type plug fuse.

48TC*D16

17

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personalinjury or death.

Using unit--mounted convenience outlets: Units withunit--mounded convenience outlet circuits will oftenrequire that two disconnects be opened to de--energizeall power to the unit. Treat all units as electricallyenergized until the convenience outlet power is alsochecked and de--energization is confirmed. ObserveNational Electrical Code Article 210, Branch Circuits,for use of convenience outlets.

! WARNING

Installing Weatherproof Cover: A weatherproofwhile-in-use cover for the factory-installed convenienceoutlets is now required by UL standards. This cover cannotbe factory-mounted due its depth; it must be installed at unitinstallation. For shipment, the convenience outlet is coveredwith a blank cover plate.

The weatherproof cover kit is shipped in the unit’s controlbox. The kit includes the hinged cover, a backing plate andgasket.

DISCONNECT ALL POWER TO UNIT ANDCONVENIENCE OUTLET.

Remove the blank cover plate at the convenience outlet;discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, untilapproximately 1/2-in (13 mm) under screw heads areexposed. Press the gasket over the screw heads. Slip thebacking plate over the screw heads at the keyhole slotsand align with the gasket; tighten the two screws untilsnug (do not over-tighten).

Mount the weatherproof cover to the backing plate asshown in Fig. 34. Remove two slot fillers in the bottom ofthe cover to permit service tool cords to exit the cover.Check for full closing and latching.

RECEPTACLENOT INCLUDED

COVER – WHILE-IN-USE WEATHERPROOF

BASE PLATE FOR GFCI RECEPTACLE

C09022

Fig. 34 -- Weatherproof Cover Installation

Factory--Option Thru--Base Connections(Electrical Connections)—

This service connection kit consists of a 1/2--in electricalbulkhead connector and a 11/2--in electrical bulkheadconnector, connected to an “L” bracket covering theembossed (raised) section of the unit basepan in thecondenser section. See Fig. 35. The 1/2--in bulkheadconnector enables the low--voltage control wires to passthrough the basepan. The 11/2--in electrical bulkheadconnector allows the high--voltage power wires to passthrough the basepan.

1/2” ELECTRICAL BULKHEADCONNECTOR

11/2” ELECTRICAL BULKHEADCONNECTOR

C10907

Fig. 35 -- Thru--the--Base Option, Shipping Position

1. Remove the “L” bracket assembly from the unit.2. Remove connector plate assembly from the “L”

bracket and discard the “L” bracket, but retain thewasher head screws and the gasket (located betweenthe “L” bracket and the connector plate assembly).

NOTE: Take care not to damage the gasket, as it isreused in the following step.

3. Place the gasket over the embossed area in thebasepan, aligning the holes in the gasket to the holesin the basepan. See Fig. 36.

4. Install the connector plate assembly to the basepanusing 8 of the washer head screws.

NOTE: If electrical connections are not going to occur atthis time, tape or otherwise cover the fittings so thatmoisture does not get into the building or conduit in theinterim.

GASKET

CONNECTORPLATEASSEMBLY

C10908

Fig. 36 -- Completing Installation of Thru--the--BaseOption

48TC*D16

18

Check tightness of connector lock nuts before connectingelectrical conduits.Field--supplied and field--installed liquid tight conduitconnectors and conduit may be attached to the connectorson the basepan. Pull correctly rated high voltage and lowvoltage through appropriate conduits. Connect the powerconduit to the internal disconnect (if unit is so equipped)or to the external disconnect (through unit side panel). Ahole must be field cut in the main control box bottom onthe left side so the 24--v control connections can be made.Connect the control power conduit to the unit control boxat this hole.

Units without Thru--Base Connections —

1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and controlbox.

2. Install power lines to terminal connections as shownin Fig. 30.

Field Control Wiring —

The 48TC*16D requires an external temperature controldevice. This device can be a thermostat (field--supplied)or a PremierLink controller (available as factory--installedoption or as field--installed accessory, for use on a CarrierComfort Network or as a stand alone control) or the RTUOpen Controller for Building Management Systems usingnon--CCN protocols (RTU Open is available as afactory--installed option only).

Thermostat —

Install a Carrier--approved accessory 2 stageCooling/Heating thermostat according to installationinstructions included with the accessory. If using anelectronic thermostat, configure it for “non--heat pump”operation. Locate the thermostat accessory on a solid wallin the conditioned space to sense average temperature inaccordance with the thermostat installation instructions.

X

C

G

W2

C

W2

G

W1

O/B/Y2 Y2

R

W1

R

Y1 Y1

THERMOSTAT

(see Note)

Note: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Do not configure for O output.

Field Wiring

CentralTerminalBoard

TypicalThermostatConnections

C10903

Fig. 37 -- Typical Low--Voltage Control Connections

If the thermostat contains a logic circuit requiring 24--vpower, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If thethermostat does not require a 24--v source (no “C”connection required), use a thermostat cable or equivalentwith minimum of six leads. Check the thermostatinstallation instructions for additional features whichmight require additional conductors in the cable.

For wire runs up to 50 ft. (15 m), use no. 18 AWG(American Wire Gage) insulated wire (35_C minimum).For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulatedwire (35_C minimum). For over 75 ft. (23 m), use no. 14AWG insulated wire (35_C minimum). All wire sizeslarger than no. 18 AWG cannot be directly connected tothe thermostat and will require a junction box and spliceat the thermostat.

Unit without Thru--Base Connection Kit —

Pass the thermostat control wires through the bushing on theunit end panel. Route the wire through the snap--in wire tieand up to the web bushing near the control box. Route thewire through the bushing and into the bottom left side of thecontrol box after removing one of the two knockouts in thecorner of the box. Use a connector at the control box toprotect the wire as it passes into the control box. Pull thewires over to the terminal strip at the upper left corner of theCentral Terminal Board (CTB). Use the connector at thecontrol box and the wire tie to take up any slack in thethermostat wire to ensure that it will not be damaged bycontact with the condenser coil. See Fig. 38.

NOTE: If thru--the--bottom connections accessory isused, refer to the accessory installation instructions forinformation on routing power and control wiring.

Thermostat WireC10886

Fig. 38 -- Thermostat Wire Routing

All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit isto be connected to a 208-v power supply, the controltransformer must be rewired by moving the black wirewith the 1/4-in. female spade connector from the 230--vconnection and moving it to the 200-v 1/4-in. maleterminal on the primary side of the transformer. Refer tounit label diagram for additional information.

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stageand 0.14 amp for second--stage heating, when available.

48TC*D16

19

PremierLinkt (Factory Option)

C08199

Fig. 39 -- PremierLink Controller

NOTE: Refer to Form 33CS--58SI for completePremierLink configuration, operating sequences andtroubleshooting information. Have a copy of this manualavailable at unit start--up.

The PremierLink controller (see Fig. 39) is compatiblewith Carrier Comfort Networkr (CCN) devices. Thiscontrol is designed to allow users the access and ability tochange factory--defined settings, thus expanding thefunction of the standard unit control board. CCN serviceaccess tools include System Pilot (TM), Touch Pilot (TM)and Service Tool. (Standard tier display tools Navigatortand Scrolling Marquee are not suitable for use with latestPremierLink controller (Version 2.x).)

The PremierLink control is factory--mounted in the48TC*D16 unit’s main control box to the left of theCentral Terminal Board (CTB). Factory wiring iscompleted through harnesses connected to the CTB. Fieldconnections are made at a 16--pole terminal block (TB3)located on the bottom shelf of the unit control box in frontof the PremierLink controller. The factory--installedPremierLink control includes the supply--air temperature(SAT) sensor. The outdoor air temperature (OAT) sensor isincluded in the FIOP/accessory EconoMi$ert2 package.(See page 34 for accessory enthalpy controls.)

The PremierLink controller requires the use of a Carrierelectronic thermostat or a CCN connection for timebroadcast to initiate its internal timeclock. This isnecessary for broadcast of time of day functions(occupied/unoccupied).

NOTE: PremierLink controller is shipped in Sensor mode.To be used with a thermostat, the PremierLink controllermust be configured to Thermostat mode. Refer toPremierLink Configuration instructions for Operating Mode.

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48TC*D16 units, the unit is suppliedwith a supply--air temperature (SAT) sensor

(33ZCSENSAT). This sensor is a tubular probe type,approx 6--inches (12.7 mm) in length. It is a nominal 10--kohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied tothe supply--air opening (on the horizontal opening end) inits shipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2--in. hole in the flange or duct.Use the template provided in the unit control box. Use twofield--supplied, self--drilling screws to secure the sensorprobe in a horizontal orientation. See Fig. 40.

SUPPLY AIR RETURN AIR

SUPPLY AIRTEMPERATURESENSOR

ROOFCURB

C10020

Fig. 40 -- Typical Mounting Location for Supply AirTemperature (SAT) Sensor on Small Rooftop Units

NOTE: The sensor must be mounted in the dischargeairstream downstream of the cooling coil and any heatingdevices. Be sure the probe tip does not come in contactwith any of the unit’s heater surfaces.

48TC*D16

20

C10808

Fig. 41 -- PremierLink Wiring Schematic

48TC*D16

21

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOPor accessory). It is a nominal 10k ohm thermistor attachedto an eyelet mounting ring.

EconoMi$er2 —

The PremierLink control is used with EconoMi$er2(option or accessory) for outdoor air management. Thedamper position is controlled directly by the PremierLinkcontrol; EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensor

Refer to Table 2 for accessory part numbers.

Field Connections

Field connections for accessory sensor and input devicesare made at the 16--pole terminal block (TB3) locatedbeneath the PremierLink control (see Fig. 41). Some inputdevices also require a 24--vac signal source; connect atCTB terminal R at “THERMOSTAT” connection strip forthis signal source. See connections figures on followingpages for field connection locations (and for continuedconnections at the PremierLink board inputs). Route wiresto control box as indicated in Fig. 38.

Table 3 provides a summary of field connections for unitsequipped with Space Sensor. Table 4 provides a summary offield connections for units equipped with Space Thermostat.

Space Sensors —

The PremierLink controller is factory--shipped configuredfor Space Sensor Mode. A Carrier T--55 or T--56 spacesensor must be used. T--55 space temperature sensorprovides a signal of space temperature to the PremierLinkcontrol. T--56 provides same space temperature signal plusit allows for adjustment of space temperature setpointsfrom the face of the sensor by the occupants.

2 3 4 5 61

SW1

SEN

BRN (GND)BLU (SPT)

RED(+)WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

C08201

Fig. 42 -- T--55 Space Temperature Sensor Wiring

Connect T--55: See Fig. 42 for typical T--55 internalconnections. Connect the T--55 SEN terminals to TB3terminals 1 and 3 (see Fig. 43).

SEN J6-7

J6-6

1

3

TB3 PL

SEN

C10023

Fig. 43 -- PremierLink T--55 Sensor

Connect T--56: See Fig. 44 for T--56 internal connections.Install a jumper between SEN and SET terminals asillustrated. Connect T--56 terminals to TB3 terminals 1, 3and 5 (see Fig. 45).

2 3 4 5 61

SW1

SEN SET

Cool Warm

BRN (GND)BLU (SPT)

RED(+)WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

JUMPERTERMINALSAS SHOWN

BLK(T56)

C08202

Fig. 44 -- T--56 Internal Connections

SEN J6-7

J6-6

1

3

TB3 PL

SEN

SET

Jumper

TB3 PL

J6-55SET

C10022

Fig. 45 -- PremierLink T--56 Sensor

Connect Thermostat —

A 7--wire thermostat connection requires a 24--v powersource and a common connection. Use the R and Cterminals on the CTB’s THERMOSTAT connection stripfor these. Connect the thermostat’s Y1, Y2, W1, W2 andG terminals to PremierLink TB3 as shown in Fig. 46.

If the 48TC*D16 unit is equipped with factory--installedsmoke detector(s), disconnect the factory BLU lead atTB1--6 (Y2) before connecting the thermostat. Identify theBLU lead originating at CTB--DDC--1; disconnect atTB1--6 and tape off. Confirm that the second BLU lead atTB1--6 remains connected to PremierLink J4--8.

48TC*D16

22

G J4-12

J4-10

J4-8

Y1

Y2

2

R R

4

6

J4-6

J4-4W2

C

8

10

C

SPACETHERMOSTAT

CTBTHERMOSTAT

PL

W1

TB3

CTBTHERMOSTAT

C10283

Fig. 46 -- Space Thermostat Connections

Table 2 – PremierLink Sensor Usage

APPLICATIONOUTDOOR AIRTEMPERATURESENSOR

RETURN AIRTEMPERATURESENSOR

OUTDOOR AIRENTHALPY SENSOR

RETURN AIRENTHALPY SENSOR

Differential Dry BulbTemperature withPremierLink

(PremierLink requires4---20 mA Actuator)

Included ---CRTEMPSN001A00

Required ---33ZCT55SPTor equivalent

--- ---

Single Enthalpy withPremierLink

(PremierLink requires4---20mA Actuator)

Included ---Not Used --- Requires ---

33CSENTHSW ---

Differential Enthalpywith PremierLink

(PremierLink requires4---20mA Actuator)

Included ---Not Used ---

Requires ---33CSENTHSWor equivalent

Requires ---33CSENTSENor equivalent

NOTES:CO2 Sensors (Optional):33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.33ZCASPCO2 --- Aspirator box used for duct---mounted CO2 room sensor.33ZCT55CO2 --- Space temperature and CO2 room sensor with override.33ZCT56CO2 --- Space temperature and CO2 room sensor with override and setpoint.

48TC*D16

23

Table 3 – Space Sensor Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL1 T55---SEN/T56---SEN Analog (10k thermistor)2 RMTOCC Discrete, 24VAC3 T55---SEN/T56---SEN Analog (10k thermistor)4 CMPSAFE Discrete, 24VAC5 T56---SET Analog (10k thermistor)6 FSD Discrete, 24VAC7 LOOP---PWR Analog, 24VDC8 SPS Discrete, 24VAC9 IAQ---SEN Analog, 4---20mA10 FILTER Discrete, 24VAC11 IAQ---COM/OAQ---COM/RH---COM Analog, 4---20mA12 CCN + (RED) Digital, , 5VDC13 OAQ---SEN/RH---SEN Analog, 4---20mA14 CCN Gnd (WHT) Digital, 5VDC15 AUX OUT(Power Exhaust) (Output)Discrete 24VAC16 CCN --- (BLK) Digital, 5VDC

LEGEND:T55 --- Space Temperature Sensor FSD --- Fire ShutdownT56 --- Space Temperature Sensor IAQ --- Indoor Air Quality (CO2)CCN --- Carrier Comfort Network (communication bus) OAQ --- Outdoor Air Quality (CO2)CMPSAFE --- Compressor Safety RH --- Relative HumidityFILTER --- Dirty Filter Switch SFS --- Supply Fan Status

Table 4 – Thermostat Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL1 RAT SEN Analog (10k thermistor)2 G Discrete, 24VAC3 RAT SEN Analog (10k thermistor)4 Y1 Discrete, 24VAC56 Y2 Discrete, 24VAC7 LOOP---PWR Analog, 24VDC8 W1 Discrete, 24VAC9 IAQ---SEN Analog, 4---20mA10 W2 Discrete, 24VAC11 IAQ---COM/OAQ---COM/RH---COM Analog, 4---20mA12 CCN + (RED) Digital, 5VDC13 OAQ---SEN/RH---SEN Analog, 4---20mA14 CCN Gnd (WHT) Digital, 5VDC15 AUX OUT (Power Exhaust) (Output) Discrete 24VAC16 CCN --- (BLK) Digital, 5VDC

LEGEND:CCN --- Carrier Comfort Network (communication bus) RH --- Relative HumidityG --- Thermostat Fan W1 --- Thermostat Heat Stage 1IAQ --- Indoor Air Quality (CO2) W2 --- Thermostat Heat Stage 2OAQ --- Outdoor Air Quality (CO2) Y1 --- Thermostat Cool Stage 1RAT --- Return Air Temperature Y2 --- Thermostat Cool Stage 2

48TC*D16

24

If the 48TC*D16 unit has an economizer system andfree--cooling operation is required, a sensor representingReturn Air Temperature must also be connected(field--supplied and installed). This sensor may be a T--55Space Sensor (see Fig. 42) installed in the space or in thereturn duct, or it may be sensor PNO 33ZCSENSAT,installed in the return duct. Connect this sensor to TB3--1and TB3--3 per Fig. 43.

Configure the unit for Thermostat Mode —

Connect to the CCN bus using a CCN service tool andnavigate to PremierLink Configuration screen forOperating Mode. Default setting is Sensor Mode (value1). Change the value to 0 to reconfigure the controller forThermostat Mode.

When the PremierLink is configured for ThermostatMode, these functions are not available: Fire Shutdown(FSD), Remote Occupied (RMTOCC), Compressor Safety(CMPSAFE), Supply Fan Status (SFS), and Filter PressureSwitch (FILTER).

Economizer Controls

To wire the return air enthalpy sensor, perform thefollowing:

1. Use a 2--conductor, 18 or 20 AWG, twisted pair cableto connect the return air enthalpy sensor to the en-thalpy controller.

2. Connect the field--supplied RED wire to (+) spadeconnector on the return air enthalpy sensor and the(+) terminal on the enthalpy controller. Connect theBLK wire to (--) spade connector on the return air en-thalpy sensor and the (--) terminal on the enthalpycontroller.

Indoor Air Quality (CO2 sensor) —

The indoor air quality sensor accessory monitors spacecarbon dioxide (CO2) levels. This information is used tomonitor IAQ levels. Several types of sensors are available,for wall mounting in the space or in return duct, with andwithout LCD display, and in combination with spacetemperature sensors. Sensors use infrared technology tomeasure the levels of CO2 present in the space air.

The CO2 sensors are all factory set for a range of 0 to2000 ppm and a linear mA output of 4 to 20. Refer to theinstructions supplied with the CO2 sensor for electricalrequirements and terminal locations. See Fig. 47 fortypical CO2 sensor wiring schematic.

To accurately monitor the quality of the air in theconditioned air space, locate the sensor near a return--airgrille (if present) so it senses the concentration of CO2leaving the space. The sensor should be mounted in alocation to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between the sensor and anycorner. Avoid mounting the sensor where it is influencedby the supply air; the sensor gives inaccurate readings ifthe supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room airbefore it is drawn into the return airstream.

8 7 6 5 4 3 2 12 1

H G 24 VACOR

24 VDC

NC ALARMRELAYCONTACTS

COMNO }

0-10VDCSIG COM4-20mA

+

+-

+ -

J3 J4

C08635

Fig. 47 -- Indoor/Outdoor Air Quality (CO2) Sensor(33ZCSENCO2) -- Typical Wiring Diagram

Wiring the Indoor Air Quality Sensor: For each sensor,use two 2--conductor 18 AWG (American Wire Gage)twisted--pair cables (unshielded) to connect the separateisolated 24 vac power source to the sensor and to connectthe sensor to the control board terminals.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on thesensor. See Fig. 47. Connect the 4--20 mA terminal toterminal TB3--9 and connect the SIG COM terminal toterminal TB3--11. See Fig. 48.

J4

J5-5

J5-3

9

11TB1

TB1IAQ Sensor

PL

24 VAC

4-20mA

SIG COM

C10737

Fig. 48 -- Indoor CO2 Sensor (33ZCSENCO2)Connections

Refer to Form 33CS--58SI, PremierLink Installation,Start--up, and Configuration Instructions, for detailedconfiguration information

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plusweatherproof enclosure) —

The outdoor air CO2 sensor is designed to monitor carbondioxide (CO2) levels in the outside ventilation air andinterface with the ventilation damper in an HVAC system.The OAQ sensor is packaged with an outdoor cover. SeeFig. 49. The outdoor air CO2 sensor must be located in theeconomizer outside air hood.

48TC*D16

25

COVER REMOVED SIDE VIEW

C07135

Fig. 49 -- Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO2 Sensor: A dedicatedpower supply is required for this sensor. A two--wire cableis required to wire the dedicated power supply for thesensor. The two wires should be connected to the powersupply and terminals 1 and 2.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on theOAQ sensor. See Fig. 47. Connect the 4 to 20 mAterminal to the TB3--13 terminal of the 48TC*D16.Connect the SIG COM terminal to the TB3--11 terminal ofthe 48TC*D16. See Fig. 50.

J5-2

J5-3

13

11TB1

TB1OAQ Sensor/RH Sensor

PL

24 VAC

4-20mA

SIG COM

C10743

Fig. 50 -- Outdoor CO2 Sensor Connections

Smoke Detector/Fire Shutdown (FSD) —

This function is available only when PremierLink isconfigured for (Space) Sensor Mode. The unit isfactory--wired for PremierLink FSD operation whenPremierLink is factory--installed.

On 48TC*D16 units equipped with factory--installedSmoke Detector(s), the smoke detector controllerimplements the unit shutdown through its NC contact setconnected to the unit’s CTB input. The FSD function isinitiated via the smoke detector’s Alarm NO contact set.The PremierLink communicates the smoke detector’stripped status to the CCN building control. See Fig. 41,the PremierLink wiring schematic.

Filter Status Switch —

This function is available only when PremierLink isconfigured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in twoways: By monitoring a field--supplied/installed filterpressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switchaccording to switch manufacturer’s instructions, tomeasure pressure drop across the unit’s return filters.Connect one side of the switch’s NO contact set to CTB’sTHERMOSTAT--R terminal. Connect the other side of theNO contact set to TB3--10. Setpoint for Dirty Filter is setat the switch. See Fig. 51.

R

TB3J4-4PL

Filter Switch (NO, close on rising pressure (high drop))

CTBThermostat

10

C10286

Fig. 51 -- PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filterpressure drop increases (indicating dirt--laden filters), theinput signal to PremierLink causes the filter status point toread “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS--58SI forinstructions on using the PremierLink Configurationscreens and on unit alarm sequence.

Supply Fan Status Switch —

The PremierLink control can monitor supply fan operationthrough a field--supplied/installed differential pressureswitch. This sequence will prevent (or interrupt) operationof unit cooling, heating and economizer functions untilthe pressure switch contacts are closed indicating propersupply fan operation.

Install the differential pressure switch in the supply fansection according to switch manufacturer’s instructions.Arrange the switch contact to be open on no flow and toclose as pressure rises indicating fan operation.

Connect one side of the switch’s NO contact set to CTB’sTHERMOSTAT--R terminal. Connect the other side of theNO contact set to TB3--8. Setpoint for Supply Fan Statusis set at the switch. See Fig. 52.

R

TB3J4-6PL

Fan (Pressure) Switch (NO, close on rise in pressure)

CTBThermostat

8

C10287

Fig. 52 -- PremierLink Wiring Fan Pressure SwitchConnection

Remote Occupied Switch —

The PremierLink control permits a remote timeclock tooverride the control’s on--board occupancy schedule andplace the unit into Occupied mode. This function may alsoprovide a “Door Switch” time delay function that willterminate cooling and heating functions after a 2--20 minutedelay.

48TC*D16

26

Connect one side of the NO contact set on the timeclockto CTB’s THERMOSTAT--R terminal. Connect the otherside of the timeclock contact to the unit’s TB3--2 terminal.See Fig. 53.

R

2TB3 PLTime Clock

Remote Occupied LCTBThermostat

J4-12

C10288

Fig. 53 -- PremierLink Wiring Remote Occupied

Refer to Form 33CS--58SI for additional information onconfiguring the PremierLink control for Door Switchtimer function.

Space Relative Humidity Sensor —

The RH sensor is not used with 48TC*D16 models at thistime.

Power Exhaust (output) —

Connect the accessory Power Exhaust contactor coils(s)per Fig. 54.

J8-315

C

TB3 PLPEC

TAN

Power Exhaust

CTBTHERMOSTAT

GRA

C10289

Fig. 54 -- PremierLink Power Exhaust OutputConnection

CCN Communication Bus —

The PremierLink controller connects to the bus in a daisychain arrangement. Negative pins on each componentmust be connected to respective negative pins, andlikewise, positive pins on each component must beconnected to respective positive pins. The controllersignal pins must be wired to the signal ground pins.Wiring connections for CCN must be made at the 3--pinplug.

At any baud (9600, 19200, 38400 baud), the number ofcontrollers is limited to 239 devices maximum. Bus lengthmay not exceed 4000 ft, with no more than 60 totaldevices on any 1000--ft section. Optically isolated RS--485repeaters are required every 1000 ft.

NOTE: Carrier device default is 9600 band.

Communications Bus Wire Specifications: The CCNCommunication Bus wiring is field--supplied andfield--installed. It consists of shielded 3--conductor cablewith drain (ground) wire. The cable selected must beidentical to the CCN Communication Bus wire used forthe entire network.

See Table 5 for recommended cable.

Table 5 – Recommended Cables

MANUFACTURER CABLE PART NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

NOTE: Conductors and drain wire must be at least 20AWG, stranded, and tinned copper. Individual conductorsmust be insulated with PVC, PVC/nylon, vinyl, Teflon, orpolyethylene. An aluminum/polyester 100% foil shieldand an outer jacket of PVC, PVC/nylon, chrome vinyl, orTeflon with a minimum operating temperature range of--20_C to 60_C is required. Do not run communicationwire in the same conduit as or next to any AC voltagewiring.

The communication bus shields must be tied together ateach system element. If the communication bus is entirelywithin one building, the resulting continuous shield mustbe connected to ground at only one single point. If thecommunication bus cable exits from one building andenters another building, the shields must be connected tothe grounds at a lightning suppressor in each building (onepoint only).

Connecting CCN Bus:

NOTE: When connecting the communication bus cable,a color code system for the entire network isrecommended to simplify installation and checkout. SeeTable 6 for the recommended color code.

Table 6 – Color Code Recommendations

SIGNAL TYPE CCN BUS WIRECOLOR

CCN PLUG PINNUMBER

+ Red 1

Ground White 2

--- Black 3

Connect the CCN (+) lead (typically RED) to the unit’sTB3--12 terminal. Connect the CCN (ground) lead(typically WHT) to the unit’s TB3--14 terminal. Connectthe CCN (--) lead (typically BLK) to the unit’s TB3--16terminal. See Fig. 55.

CCN Bus

J2-1

J2-2GND (WHT)

12

14TB3

J2-3– (BLK) 16TB3

TB3 PL+ (RED)

C10290

Fig. 55 -- PremierLink CCN Bus Connections

48TC*D16

27

RTU Open Control System

The RTU Open controller is an integrated component ofthe Carrier rooftop unit. Its internal applicationprogramming provides optimum performance and energyefficiency. RTU Open enables the unit to run in 100%stand--alone control mode, Carrier’s I--Vu Open network,or a Third Party Building Automation System (BAS).On--board DIP switches allow you to select your protocol(and baud rate) of choice among the four most popularprotocols in use today: BACnet, Modbus, Johnson N2 andLonWorks. (See Fig. 56.)

The RTU Open control is factory--mounted in the48TC*D16 unit’s main control box, to the left of the CTB.See Fig. 57. Factory wiring is completed throughharnesses connected to the CTB. Field connections forRTU Open sensors will be made at the Phoenix connectorson the RTU Open board. The factory--installed RTU Opencontrol includes the supply--air temperature (SAT) sensor.The outdoor air temperature (OAT) sensor is included inthe FIOP/accessory EconoMi$er2 package.

Refer to Table 7, RTU Open Controller Inputs and Outputsfor locations of all connections to the RTU Open board.

C10811

Fig. 56 -- RTU Open Multi--Protocol Control Board

C10810Fig. 57 -- 48TC*D16 Control Box Component Locations

48TC*D16

28

C10809Fig. 58 -- RTU Open System Control Wiring Diagram

48TC*D16

29

Table 7 – RTU Open Controller Inputs and Outputs

POINT NAME BACnet OBJECTNAME TYPE OF I/O CONNECTION PIN

NUMBER(S)

DEDICATED INPUTSSpace Temp / Zone Temp zone_temp AI (10K Thermistor) J20---1, 2Supply Air Temperature sa_temp AI (10K Thermistor) J2---1, 2Outdoor Air Temperature oa_temp AI (10K Thermistor) J2---3, 4Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J20---3Safety Chain Feedback safety_status DI (24 VAC) J1---9Compressor Safety Status comp_status DI (24 VAC) J1---2Fire Shutdown Status firedown_status DI (24 VAC) J1---10Enthalpy Status enthalpy_status DI (24 VAC) J2---6Humidistat Input Status humstat_status DI (24 VAC) J5---7

CONFIGURABLE INPUTSIndoor Air CO2 iaq AI (4---20 ma)

J4---2 or J4---5Outdoor Air CO2 oaq AI (4---20 ma)Space Relative Humidity space_rh AI (4---20 ma)Supply Fan Status* sfan_status DI (24 VAC)

J5---1 or J5---3 orJ5 5 or J5---7

Filter Status* filter_status DI (24 VAC)Door Contact Input* door_contact_status DI (24 VAC)Occupancy Contact* occ_contact_status DI (24 VAC)

OUTPUTSEconomizer Output econ_output AO (4---20ma) J2---5Supply Fan Relay State sfan DO Relay (24VAC , 1A) J1---4Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1---8Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J1---7Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1---6Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1---5Power Exhaust Relay State pexh DO Relay (24VAC , 1A) J11---3Dehumidification Relay State dehum DO Relay (24VAC, 1A) J11---7, 8

LEGENDAI --- Analog InputAO --- Analog OutputDI --- Discrete InputDO --- Discrete Output* These inputs (if installed) take the place of the default input on the specific channel according to schematic.Parallel pins J5---1 = J2---6, J5---3 = J1---10, J5---5 = J1---2 are used for field---installation.

The RTU Open controller requires the use of a Carrierspace sensor. A standard thermostat cannot be used withthe RTU Open system.

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48TC*D16 unit, the unit is supplied witha supply--air temperature (SAT) sensor (33ZCSENSAT). Thissensor is a tubular probe type, approx 6--inches (12.7 mm) inlength. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied tothe supply--air opening (on the horizontal opening end) inits shipping position. Remove the sensor for installation.Re--position the sensor in the flange of the supply--airopening or in the supply air duct (as required by localcodes). Drill or punch a 1/2--in. hole in the flange or duct.Use two field--supplied, self--drilling screws to secure thesensor probe in a horizontal orientation. See Fig. 40.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOPor accessory). It is a nominal 10k ohm thermistor attachedto an eyelet mounting ring.

EconoMi$er2 —

The RTU Open control is used with EconoMi$er2 (optionor accessory) for outdoor air management. The damperposition is controlled directly by the RTU Open control;EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced withfield--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)Space CO2 sensorOutdoor air CO2 sensor

Field Connections

Field connections for accessory sensors and input devicesare made the RTU Open, at plugs J1, J2, J4, J5, J11 andJ20. All field control wiring that connects to the RTUOpen must be routed as shown in Fig. 38. This routingprovides the UL required clearance between high-- andlow--voltage wiring. Connect to the wires to theremovable Phoenix connectors and then reconnect theconnectors to the board.

48TC*D16

30

Space Temperature (SPT) Sensors —

There are 2 types of SPT sensors available from Carrier,resistive input non-communicating (T55, T56, and T59)and Rnet communicating (SPS, SPPL, SPP, and SPPF)sensors. Each type has a variety of options consisting of:timed override button, set point adjustment, a LCDscreen, and communication tie in. Space temperature canbe also be written to from a building network or zoningsystem. However, it is still recommended that return airduct sensor be installed to allow stand-alone operation forback-up. Refer to the configuration section for details oncontroller configurations associated with space sensors.Field connections to T--55, T--56 and T--59 are provided asexamples.

S 33ZCT55SPT, space temperature sensor with overridebutton (T--55)

S 33ZCT56SPT, space temperature sensor with overridebutton and setpoint adjustment (T--56)

S 33ZCT59SPT, space temperature sensor with LCD(liquid crystal display) screen, override button, andsetpoint adjustment (T--59)

Use 20 gauge wire to connect the sensor to the controller.The wire is suitable for distances of up to 500 ft. Use athree--conductor shielded cable for the sensor and setpointadjustment connections. If the setpoint adjustment(slidebar) is not required, then an unshielded, 18 or 20gauge, two--conductor, twisted pair cable may be used.

Connect T--55: See Fig. 42 for typical T--55 internalconnections. Connect the T--55 SEN terminals to RTU OpenJ20--1 and J20--2. See Fig. 59.

SEN

SEN

J20-1

J20-2

C08460

Fig. 59 -- RTU Open T--55 Sensor Connections

Connect T--56: See Fig. 44 for T--56 internal connections.Install a jumper between SEN and SET terminals asillustrated. Connect T--56 terminals to RTU Open J20--1,J20--2 and J20--3 per Fig. 60.

SEN J20-1

J20-2SEN

SET

Jumper

J20-3SET

C08461

Fig. 60 -- RTU Open T--56 Sensor Connections

Connect T--59: The T--59 space sensor requires aseparate, isolated power supply of 24 VAC. See Fig. 61for internal connections at the T--59. Connect the SENterminal (BLU) to RTU Open J20--1. Connect the COMterminal (BRN) to J20--2. Connect the SET terminal (STOor BLK) to J20--3.

OR SET SEN

OPB COM- PWR+

BLU (SPT)

BLK (STO)

24 VAC

SENSORWIRING

POWERWIRING

BRN (COM)

NOTE: Must use a separate isolated transformer.

J20-3

J20-2

J20-1

C10291

Fig. 61 -- Space Temperature Sensor Typical Wiring(33ZCT59SPT)

Indoor Air Quality (CO2 sensor) —

The indoor air quality sensor accessory monitors spacecarbon dioxide (CO2) levels. This information is used tomonitor IAQ levels. Several types of sensors are available,for wall mounting in the space or in return duct, with andwithout LCD display, and in combination with spacetemperature sensors. Sensors use infrared technology tomeasure the levels of CO2 present in the space air.

The CO2 sensors are all factory set for a range of 0 to2000 ppm and a linear mA output of 4 to 20. Refer to theinstructions supplied with the CO2 sensor for electricalrequirements and terminal locations. See Fig. 47 fortypical CO2 sensor wiring schematic.

To accurately monitor the quality of the air in theconditioned air space, locate the sensor near a return--airgrille (if present) so it senses the concentration of CO2leaving the space. The sensor should be mounted in alocation to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources.Allow at least 3 ft (0.9 m) between the sensor and anycorner. Avoid mounting the sensor where it is influencedby the supply air; the sensor gives inaccurate readings ifthe supply air is blown directly onto the sensor or if thesupply air does not have a chance to mix with the room airbefore it is drawn into the return airstream.

48TC*D16

31

Wiring the Indoor Air Quality Sensor: For each sensor,use two 2--conductor 18 AWG (American Wire Gage)twisted--pair cables (unshielded) to connect the separateisolated 24 vac power source to the sensor and to connectthe sensor to the control board terminals.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on thesensor. See Fig. 47. Connect the 4--20 mA terminal toRTU Open J4--2 and connect the SIG COM terminal toRTU Open J4--3. See Fig. 62.

4-20mA

SIG COM

J4-2

J4-3

IAQ Sensor

24 VAC C10738

Fig. 62 -- RTU Open / Indoor CO2 Sensor(33ZCSENCO2) Connections

Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plusweatherproof enclosure) —

The outdoor air CO2 sensor is designed to monitor carbondioxide (CO2) levels in the outside ventilation air andinterface with the ventilation damper in an HVAC system.The OAQ sensor is packaged with an outdoor cover. SeeFig. 49. The outdoor air CO2 sensor must be located in theeconomizer outside air hood.

Wiring the Outdoor Air CO2 Sensor: A dedicatedpower supply is required for this sensor. A two--wire cableis required to wire the dedicated power supply for thesensor. The two wires should be connected to the powersupply and terminals 1 and 2.

To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on theOAQ sensor. See Fig. 47. Connect the 4 to 20 mAterminal to RTU Open J4--5. Connect the SIG COMterminal to RTU Open J4--6. See Fig. 63.

4-20mA

SIG COM

J4-5

J4-6

OAQ Sensor/RH Sensor

24 VAC C10739

Fig. 63 -- RTU Open / Outdoor CO2 Sensor(33ZCSENCO2) Connections

On 48TC*D16 units equipped with factory--installedSmoke Detector(s), the smoke detector controllerimplements the unit shutdown through its NC contact setconnected to the unit’s CTB input. The FSD function isinitiated via the smoke detector’s Alarm NO contact set.The RTU Open controller communicates the smokedetector’s tripped status to the BAS building control. SeeFig. 58, the RTU Open System Control Wiring Diagram.

The Fire Shutdown Switch configuration,MENU→Config→Inputs→input 5, identifies thenormally open status of this input when there is no firealarm.

Connecting Discrete Inputs —

Filter Status: The filter status accessory is afield--installed accessory. This accessory detects pluggedfilters. When installing this accessory, the unit must beconfigured for filter status by settingMENU→Config→Inputs→input 3, 5, 8, or 9 to FilterStatus and normally open (N/O) or normally closed (N/C).Input 8 or 9 is recommended for easy of installation. Referto Fig. 56 and Fig. 58 for wire terminations at J5.Fan Status: The fan status accessory is a field--installedaccessory. This accessory detects when the indoor fan isblowing air. When installing this accessory, the unit mustbe configured for fan status by settingMENU→Config→Inputs→input 3, 5, 8, or 9 to FanStatus and normally open (N/O) or normally closed (N/C).Input 8 or 9 is recommended for easy of installation. Referto Fig. 56 and Fig. 58 for wire terminations at J5.Remote Occupancy: The remote occupancy accessory isa field--installed accessory. This accessory overrides theunoccupied mode and puts the unit in occupied mode.When installing this accessory, the unit must beconfigured for remote occupancy by settingMENU→Config→Inputs→input 3, 5, 8, or 9 to RemoteOccupancy and normally open (N/O) or normally closed(N/C).Also set MENU→Schedules→occupancy source to DIon/off. Input 8 or 9 is recommended for easy ofinstallation. Refer to Fig. 56 and Table 7 for wireterminations at J5.

Power Exhaust (output): Connect the accessory PowerExhaust contactor coil(s) per Fig. 64.

Power Exhaust

J11-3

CTAN

PEC

CTBTHERMOSTAT

GRA

C10362

Fig. 64 -- RTU Open Power Exhaust Connections

Space Relative Humidity Sensor: The RH sensor is notused with 48TC*D16 at this time.

48TC*D16

32

Communication Wiring -- Protocols

General —

Protocols are the communication languages spoken bycontrol devices. The main purpose of a protocol is tocommunicate information in the most efficient methodpossible. Different protocols exist to provide differentkinds of information for different applications. In the BASapplication, many different protocols are used, dependingon manufacturer. Protocols do not change the function ofa controller; just make the front end user different.The RTU Open can be set to communicate on fourdifferent protocols: BACnet, Modbus, N2, and LonWorks.

Switch 3 (SW3) on the board is used to set protocol andbaud rate. Switches 1 and 2 (SW1 and SW2) are used toset the board’s network address. See Fig. 65 and 66 forprotocol switch settings and address switches. The 3rdparty connection to the RTU Open is through plug J19.See Fig. 67 for wiring. Refer to the RTU Open 3rd PartyIntegration Guide for more detailed information onprotocols, 3rd party wiring, and networking.NOTE: Power must be cycled after changing the SW1--3switch settings.

Refer to the RTU Open Controller Integration Guide(Catalog No. 11--808--428--01) for more detailed informationon protocols, 3rd party wiring, and networking.

SW3 Protocol Selection

PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1BACnet MS/TP(Master) Unused OFF OFF OFF ON OFF Select Baud Select Baud

Modbus(Slave) Unused OFF OFF ON ON OFF Select Baud Select Baud

N2(Slave) Unused OFF OFF OFF ON ON OFF OFF

LonWorks Unused ON ON OFF ON OFF OFF OFF

NOTE:DS = Dip SwitchBACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE DS2 DS19600 OFF OFF

19,200 ON OFF

38,400 OFF ON

76,800 ON ONC07166

Fig. 65 -- RTU Open SW3 Dip Switch Settings

C10815

Fig. 66 -- RTU Open Address Switches

C10816Fig. 67 -- Network Wiring

48TC*D16

33

Local Access —

BACview6 Handheld: The BACview6 is a keypad/displayinterface used to connect to the RTU Open to access thecontrol information, read sensor values, and test the RTU,see Fig. 68. This is an accessory interface that does notcome with the RTU Open controller and can only be usedat the unit. Connect the BACview6 to the RTU Open’s J12local access port. There are 2 password protected levels inthe display (User and Admin). The user password isdefaulted to 0000 but can be changed. The Adminpassword is 1111 and cannot be changed. There is a 10minute auto logout if a screen is idle. See Form48--50HCTQ--01T, Appendix A for navigation and screencontent.

Virtual BACview: Virtual BACview is a freeware computerprogram that functions as the BACview6 Handheld. TheUSB Link interface (USB--L) is required to connect acomputer to the RTU Open board. The link cable connectsa USB port to the J12 local access port. This programfunctions and operates identically to the handheld.

RTU Open Troubleshooting —

Communication LEDs: The LEDs indicate if thecontroller is speaking to the devices on the network. TheLEDs should reflect communication traffic based on thebaud rate set. The higher the baud rate the more solid theLEDs will appear.

Cable

Access Port

J12

P1 P1

P5 P5

RTU Open

BACview6 Local Access Cable

Protocol Selector

C10812

Fig. 68 -- BACview6 Handheld Connections

48TC*D16

34

Table 8 – LEDsThe LEDs on the RTU Open Control Board (see Fig. 56) show the status of certain functions:

If this LED is on... Status is...Power RTU Open has powerRx RTU Open is receiving data from the network segmentTx RTU Open is transmitting data over the network segmentDO# The digital output is active

The Run and Error LEDs indicate control module and network status

If Run LED shows... And Error LED shows... Status is...2 flashes per second Off Normal

2 flashes per second 2 flashes,alternating with Run LED Five minute auto---restart delay after system error

2 flashes per second 3 flashes,then off Control module has just been formatted

2 flashes per second 4 flashes,then pause

Two or more devices on this network have thesame ARC156 network address

2 flashes per second On Exec halted after frequent system errors orcontrol programs halted

5 flashes per second On Exec start---up aborted, Boot is running5 flashes per second Off Firmware transfer in progress, Boot is running

7 flashes per second 7 flashes per second, alternating withRun LED Ten second recovery period after brownout

14 flashes per second 14 flashes per second,alternating with Run LED Brownout

On On

Failure. Try the following solutions:S Turn RTU Open off, then on.S Format RTU Open.S Download memory to RTU Open.S Replace RTU Open.

NOTE: Refer to Catalog No. 48--50HCTQ--01T forcomplete configuration of RTU Open, operating sequencesand troubleshooting information. Refer to RTU OpenController Integration Guide (Catalog No. 11--808--428--01)for details on configuration and troubleshooting of connectednetworks. Have a copy of these manuals available at unitstart--up.

Outdoor Air Enthalpy Control(PNO 33CSENTHSW)

The enthalpy control (33CSENTHSW) is available as afield--installed accessory to be used with the EconoMi$er2damper system. The outdoor air enthalpy sensor is part ofthe enthalpy control. (The separate field--installedaccessory return air enthalpy sensor (33CSENTSEN) isrequired for differential enthalpy control. See Fig. 69.)

Locate the enthalpy control in the economizer next to theActuator Motor. Locate two GRA leads in the factoryharness and connect the gray lead labeled “ESL” to theterminal labeled “LOW”. See Fig. 69. Connect theenthalpy control power input terminals to economizeractuator power leads RED (connect to 24V) and BLK(connect to GND).

The outdoor enthalpy changeover setpoint is set at theenthalpy controller.

Differential Enthalpy Control —

Differential enthalpy control is provided by sensing andcomparing the outside air and return air enthalpy conditions.Install the outdoor air enthalpy control as described above.Add and install a return air enthalpy sensor.

Return Air Enthalpy Sensor —

Mount the return--air enthalpy sensor (33CSENTSEN) in thereturn--air section of the economizer. The return air sensor iswired to the enthalpy controller (33CSENTHSW). SeeFig. 69.

GRA

BLK

RED– 4-20 Main

+ VDC Out

– 4-20 Main Out

+ 24-36 VDC In

LOW

GND

24V

7 CTB ECON(to J4-2)

GRA

PL6-1 (24-V)

PL6-4 (COM)

Outside AirEnthalpy Switch

Return AirEnthalpySensor

C10736

Fig. 69 -- Outside and Return Air Enthalpy SensorWiring

48TC*D16

35

Smoke Detectors

Smoke detectors are available as factory--installed optionson 48TC*D16 units. Smoke detectors may be specified forSupply Air only or for Return Air without or witheconomizer or in combination of Supply Air and ReturnAir. Return Air smoke detectors are arranged for verticalreturn configurations only. All components necessary foroperation are factory--provided and mounted. The unit isfactory--configured for immediate smoke detectorshutdown operation; additional wiring or modifications tounit terminal board may be necessary to complete the unitand smoke detector configuration to meet projectrequirements.

Units equipped with factory--optional Return Air smokedetectors require a relocation of the sensor module at unitinstallation. See “Completing Installation of Return AirSmoke Sensor:” on page 37 for details.

System —

The smoke detector system consists of a four--wirecontroller and one or two sensors. Its primary function isto shut down the rooftop unit in order to prevent smokefrom circulating throughout the building. It is not to beused as a life saving device.

Controller —

The controller (see Fig. 70) includes a controller housing,a printed circuit board, and a clear plastic cover. Thecontroller can be connected to one or two compatible ductsmoke sensors. The clear plastic cover is secured to thehousing with a single captive screw for easy access to thewiring terminals. The controller has three LEDs (forPower, Trouble and Alarm) and a manual test/reset button,all located on the cover face.

Sensor Module —

The sensor module (see Fig. 71) includes a plastichousing, a printed circuit board, a clear plastic cover, asampling tube inlet and an exhaust tube. The samplingtube (when used) and exhaust tube are attached duringinstallation. The sampling tube varies in length dependingon the size of the rooftop unit. The clear plastic coverpermits visual inspections without having to disassemblethe sensor. The cover attaches to the sensor housing usingfour captive screws and forms an airtight chamber aroundthe sensing electronics. Each sensor includes a harnesswith an RJ45 terminal for connecting to the controller.Each sensor has four LEDs (for Power, Trouble, Alarmand Dirty) and a manual test/reset button (on the left--sideof the housing).

Duct smoke sensorcontroller

Fastener(2X)

Controller cover

Conduit nuts(supplied by installer)

Conduit support plate

Cover gasket(ordering option)

Conduit couplings(supplied by installer)

Terminal block cover

Controller housingand electronics

Alarm Power

Test/resetswitch

Trouble

C08208

Fig. 70 -- Controller Assembly

Duct smoke sensor

SeeDetail A

Exhaust tube

Plug

Sampling tube(ordered separately)

Intakegasket

Cover gasket(ordering option)

TSD-CO2(ordering option)

Sensor housingand electronics

Exhaust gasket

Coupling

Sensor cover

Detail A

Magnetictest/reset

switch

Alarm

Trouble

Power

Dirty

C08209

Fig. 71 -- Smoke Detector Sensor Module

48TC*D16

36

Air is introduced to the duct smoke detector sensor’ssensing chamber through a sampling tube that extends intothe HVAC duct and is directed back into the ventilationsystem through a (shorter) exhaust tube. The difference inair pressure between the two tubes pulls the sampled airthrough the sensing chamber. When a sufficient amount ofsmoke is detected in the sensing chamber, the sensorsignals an alarm state and the controller automaticallytakes the appropriate action to shut down fans andblowers, change over air handling systems, notify the firealarm control panel, etc.

The sensor uses a process called differential sensing toprevent gradual environmental changes from triggeringfalse alarms. A rapid change in environmental conditions,such as smoke from a fire, causes the sensor to signal analarm state but dust and debris accumulated over timedoes not.

For installations using two sensors, the duct smokedetector does not differentiate which sensor signals analarm or trouble condition.

Smoke Detector Locations

Supply Air —

The Supply Air smoke detector sensor is located to theleft of the unit’s indoor (supply) fan. See Fig. 72. Accessis through the left side blower access panel. There is nosampling tube used at this location. The sampling tubeinlet extends through the side plate of the fan housing(into a high pressure area). The controller is located on abracket to the right of the return filter, accessed throughthe lift--off filter panel.

Smoke Detector Sensor

C08245

Fig. 72 -- Typical Supply Air Smoke Detector SensorLocation

Return Air without Economizer —

The sampling tube is located across the return air openingon the unit basepan. See Fig. 75. The holes in thesampling tube face downward, into the return air stream.The sampling tube is connected via tubing to the return airsensor that is mounted on a bracket high on the partitionbetween return filter and controller location. (This sensoris shipped in a flat--mounting location. Installationrequires that this sensor be relocated to its operatinglocation and the tubing to the sampling tube be connected.See “Completing Installation of Return Air SmokeSensor:” for details.)

Return Air with Economizer —

The sampling tube is inserted through the side plates ofthe economizer housing, placing it across the return airopening on the unit basepan. See Fig. 73. The holes in thesampling tube face downward, into the return air stream.The sampling tube is connected via tubing to the return airsensor that is mounted on a bracket high on the partitionbetween return filter and controller location. (This sensoris shipped in a flat--mounting location. Installationrequires that this sensor be relocated to its operatinglocation and the tubing to the sampling tube be connected.See the following installation procedure.)

Return AirSampling Tube

FlexibleExhaust Tube

C10330

Fig. 73 -- Return Air Sampling Tube Location

48TC*D16

37

Completing Installation of Return Air Smoke Sensor:

1. Unscrew the two screws holding the Return AirSensor detector plate. See Fig. 74. Save the screws.

2. Remove the Return Air Sensor and its detector plate.3. Rotate the detector plate so the sensor is facing out-

wards and the sampling tube connection is on the bot-tom. See Fig. 75.

4. Screw the sensor and detector plate into its operatingposition using screws from Step 1. Make sure thesampling tube connection is on the bottom and the ex-haust tube is on the top. See Fig. 75.

5. Connect the flexible tube on the sampling inlet to thesampling tube on the basepan.

Controller

Screws

FlexibleExhaustTubes

Sampling Tube

C10331

Fig. 74 -- Return Air Detector Shipping Position

Sampling TubeC10332

Fig. 75 -- Return Air Sensor Operating Position

Additional Application Data —

Refer to Catalog No. HKRNKA--1XA for discussions onadditional control features of these smoke detectorsincluding multiple unit coordination.

48TC*D16

38

Table 9 – Unit Wire/Fuse or HACR Breaker Sizing Data

UNIT NOM.

V---Ph---HzIFMTYPE

COMBUSTIONFAN MOTOR

POWEREXHAUST NO C.O. or UNPWR C.O.

FLA FLA

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA

FUSEorHACRBRKR

DISC. SIZEMCA

FUSEorHACRBRKR

DISC. SIZE

FLA LRA FLA LRA

48TC*D16

208/230---3---60

STD

0.48 3.8

68.3 80 71 396 72.1 80 76 400MED 70.8 80 74 413 74.6 90 79 417HIGH 77.8/75.8 100/100 82/80 424 81.6/79.6 100/100 87/84 428

460---3---60

STD

0.25 1.8

34.0 45 35 234 35.8 45 37 236MED 35.0 45 37 243 36.8 45 39 245HIGH 38.2 50 40 248 40.0 50 42 250

575---3---60STD

0.24 3.826.5 30 28 184 30.3 40 32 188

MED 26.5 30 28 184 30.3 40 32 188HIGH 29.8 35 31 187 33.6 40 36 191

Table 9 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)

UNIT NOM.

V---Ph---HzIFMTYPE

COMBUSTIONFAN MOTOR

POWEREXHAUST w/ PWRD C.O.

FLA FLA

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA

FUSEorHACRBRKR

DISC. SIZEMCA

FUSEorHACRBRKR

DISC. SIZE

FLA LRA FLA LRA

48TC*D16

208/230---3---60

STD

0.48 3.8

73.1 80 77 401 76.9 100 81 405MED 75.6 100 80 418 79.4 100 84 422HIGH 82.6/80.6 100/100 88/85 429 86.4/84.4 100/100 92/90 433

460---3---60

STD

0.25 1.8

36.2 45 38 236 38.0 50 40 238MED 37.2 50 39 245 39.0 50 41 247HIGH 40.4 50 43 250 42.2 50 45 252

575---3---60STD

0.24 3.828.2 35 30 186 32.0 40 34 190

MED 28.2 35 30 186 32.0 40 34 190HIGH 31.5 40 33 189 35.3 45 38 193

Legend and Notes for Table 9LEGEND:BRKR --- Circuit breakerCO --- Convenience outletDISC --- DisconnectFLA --- Full load ampsIFM --- Indoor fan motorLRA --- Locked rotor ampsMCA --- Minimum circuit ampsP.E. --- Power exhaustPWRD CO --- Powered convenient outletUNPWR CO --- Unpowered convenient outletNOTES:1. In compliance with NEC requirements for multimotor andcombination load equipment (refer to NEC Articles 430 and440), the overcurrent protective device for the unit shall befuse or HACR breaker. Canadian units may be fuse or circuitbreaker.

2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supplyvoltage is greater than 2%. Use the following formula to de-termine the percentage of voltage imbalance.

% Voltage Imbalance = 100 xmax voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

AB = 224 vBC = 231 vAC = 226 v

Average Voltage =(224 + 231 + 226)

=681

3 3

= 227

Determine maximum deviation from average voltage.(AB) 227 – 224 = 3 v(BC) 231 – 227 = 4 v(AC) 227 – 226 = 1 vMaximum deviation is 4 v.Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x4

227

= 1.76%

This amount of phase imbalance is satisfactory as it is below themaximum allowable 2%.IMPORTANT: If the supply voltage phase imbalance is more than2%, contact your local electric utility company immediately.

48TC*D16

39

Economizer 2 Position Damper Unit Without Economizer or2 Position Damper

C10333

Fig. 76 -- EconoMi$ert IV Wiring

Step 13 — Adjust Factory--Installed Options

Smoke Detectors —

Smoke detector(s) will be connected at the Central TerminalBoard (CTB), at terminals marked “Smoke Shutdown”.Remove jumper JMP 3 when ready to energize unit.

EconoMi$er IV Occupancy Switch —

Refer to Fig. 76 for general EconoMi$er IV wiring.External occupancy control is managed through aconnection on the Central Terminal Board.

If external occupancy control is desired, connect a timeclock or remotely controlled switch (closed for Occupied,open for Unoccupied sequence) at terminals markedOCCUPANCY on CTB. Remove or cut jumper JMP 2 tocomplete the installation.

Step 14 — Install Accessories

Available accessories include:

Roof Curb (must be installed before unit)Thru--base connection kit (must be installed before unitis set on curb)Manual outside air damperTwo--Position motorized outside air damperEconoMi$er IV (with control and integrated barometricrelief)EconoMi$er2 (without control/for external signal andintegrated barometric relief)

Barometric reliefPower ExhaustDifferential dry--bulb sensor (EconoMi$er IV)Outdoor enthalpy sensorDifferential enthalpy sensorTime Guard II compressor anti--cycle controlOutdoor coil protector grilleHead pressure controlProgrammable setback thermostatElectrical/Mechanical thermostat and subbaseThermidistatt deviceHumidistatThermostat / SensorsCO2 sensorDDC interface (PremierLink)Louvered hail guardPhase monitor control

Refer to separate installation instructions for informationon installing these accessories.

Pre--Start and Start--Up

This completes the mechanical installation of the unit.Refer to the unit’s Service Manual for detailed Pre--Startand Start--up instructions.

48TC*D16

40

Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 11/10

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 48TC---10SI

Replaces: 48TC---08SI

48TC*D16