1291 Brummel Avenue Elk Grove Village, IL 60007 Phone 847 ... 6032.pdf · vice life of the units can be extended by following the installation and preventive maintenance instructions

1291 Brummel Avenue Elk Grove Village, IL 60007 Phone 847-364-8600 Fax 847-364-8601

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TABLE OF CONTENTS

General Description ……………………………….. 3 Power Cord Information ……………………………….. 4 Installation Instructions ……………………………….. 4 Standard Features ……………………………….. 5 ACRS (Advanced Condensate Removal System) ………… 6 Electrical Panel & Components ……………………………. 8 Blower-Motor Assemblies ……………………………... 9 Plug/Receptacle Chart …………………………….. 10 Optional Features ……………………………... 11 Applications ……………………………... 14 Replacement Part Procedure ……………………………... 15 Electrical Inspection/Repair ……………………………... 17 Troubleshooting Guide …………………………….. 18 Preventive Maintenance Guide …………………………….. 20 Inside View Belt Drive Units (MAC60-90) ……………….. 21 Inside View Direct Drive Units (MAC12-18) ……………... 22 Wiring Diagrams …………………………….. 23-30 Piping Schematic ……………………………. 31 Specifications ……………………………. 32 Remote Thermostat Option …………………………….. 33 Warranty …………………………….. 36

PAGE TOPIC

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GENERAL DESCRIPTION

GENERAL REQUIREMENTS

IMPORTANT: NorthWind Air Conditioners have been engineered for the comfort of those using them. The ser-vice life of the units can be extended by following the installation and preventive maintenance instructions.

NorthWind Portable Air-Cooled Air Conditioners are designed and built to cool a wide variety of applications by mov-ing air through a 12 ½ x 7 inch evaporator discharge grille (Models MAC1211/1811), 18 ½ x 8 (Models MAC3612/32), 22 x 11½ (Model MAC6012/32/34) and 23 x 11½ (Model MAC9032/34). These self-contained, port-able units can direct air to specific areas or spots (spot cooling) through optional dual 5 inch diameter nozzles (Models MAC1211/1811), 6 inch diameter dual nozzles (Models MAC3612/32), 8 inch diameter dual nozzles (Model MAC6012/32/34) and 10 inch diameter dual nozzles Model MAC90/32/34). The 10 foot cord connected NorthWind models range from 13,000 BTU/HR to 90,050 BTU/HR moveable floor mount configuration to meet most space re-quirements. All models are equipped with 2 heavy duty, swivel w/lock front casters and 2 heavy duty fixed rear casters for easy steering and parking control. MAC60 and MAC90 models have 4 swivel casters with rear swivel locks. All models include a completely self-contained refrigeration system, air handling system (evaporator and condenser blowers & motors), air filtration system (electrostatic filters), condensation removal system, and electrical supply and control system in a professionally designed, neatly arranged heavy duty metal cabinet finished with exterior grade, weather resistant, high gloss, polyester TGIC powder coating. Only power is required for operation. However, ducting the condenser air out of the area is recommended. The 24 volt temperature controller provides the desired comfort and unit control.

NOMENCLATURE

M AC 60 3 2

MOBILE

AIR-COOLED

VOLTAGE

THREE PHASE

CAPACITY SELECTION CODE

UNIT MODEL COOLING CAPACITIES

MODEL

BTU/HR

CAPACITY SELECTION

CODE

VOLTAGE

MAC1211 12,000 12 115

MAC1811 16,900 18 115

MAC3612 36,000 36 208/230/1

MAC3632 36,000 36 208/230/3

MAC6012 60,000 60 208/230/1

MAC6032 60,000 60 208/230/3

MAC6034 60,000 60 460/3

MAC9032 90,000 90 208/230/3

MAC9034 90,000 90 460/3

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LCDI POWER CORD & PLUG

This air conditioner may be equipped with an LCDI (Leakage Current Detection and Interruption) power cord and plug as required by US National Electric Code 440.65. The cord consists of a length of shielded flexible cord with no termination on the load side and an LCDI attachment plug on the line side. Three phase units are not required to have an LCDI. The LCDI power cord and plug will remove the supply source via electrical disconnect if the nominal current leakage between the cord shield and either load conductor exceeds a predetermined value. The cord will remain de-energized until the device has been manually reset. This is intended to reduce the risk of a fire in the power cord or combustible materials nearby. The cord shields are not grounded and they must be considered a shock hazard if exposed. The cord shield must not be connected to ground or to any exposed metal. The test and reset buttons on the LCDI Plug are used to check if the plug is functioning properly. To Test: 1. Plug power cord into proper outlet. 2. Press the TEST Button. Circuit should trip, cutting power to the unit and turning the green “POWER READY” light off. 3. Press the RESET Button to restore power: green light should be lit.

TEST

RES

ET

TEST Button

RESET Button

Front of LCDI Back of LCDI

WARNING: 1. DO NOT press the TEST button while the air conditioner is operating. 2. The TEST and RESET buttons should not be used as “ON” or “OFF” switches. 3. The cord and plug are not intended to offer protection to externally connected loads or supply circuits. 4. The cord and plug are intended for indoor use only.

INSTALLATION INSTRUCTIONS

BEFORE INSTALLING:

ELECTRICAL REQUIREMENTS:

Unpack the unit, remove it from the pallet carefully and inspect it for any possible shipping damage. All units are thoroughly run tested and carefully packaged at the factory. If there is any damage, note it on the delivery receipt and file a claim with the carrier immediately. It is important to read this installation manual carefully. Store this manual in a safe place for future reference.

Check the data plate on the back panel to make sure the power supply matches the requirements. Refer to “Specifications” section for voltage and fuse/breaker recommendations. For proper NEMA receptacles, refer to “Electrical Service Plug/Receptacle Chart.” Operating the unit on improper voltage will void the warranty. CAUTION: AN EXTENSION CORD CAN BE USED PROVIDED IT IS RATED AT LEAST 20 AMPS@115VOLTS, or 20 AMPS @ 250 VOLTS WITH GROUNDING-TYPE ATTACHMENT PLUG AND GROUNDING TYPE CONNEC-TOR (LOAD FITTING). Do not remove or modify the cord connected LCDI (Leakage Current Detection & Interruption) or AFCI (Arc Fault Circuit Interrupter). Do not connect the unit to an outlet that is also being used for other electrical appliances or loads. It may cause nuisance tripping of the LCDI or circuit breaker.

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1) Position the unit in the desired location. Make sure that the condenser inlet air grille is not blocked or obstructed (left side of the unit). Leave at least 8 inches of clearance for proper air flow. 2) Apply the brakes on the front casters to keep unit from rolling or moving out of position. 3) Plug power supply cord into proper receptacle. The green “Power Ready” light should be lit. Push power switch

to “on” position. Turn thermostat dial clockwise (right), to desired comfort number; the unit will start. Rapid turn-ing of the dial back and forth (short cycling) will activate the unit’s compressor time delay. The unit will not start until the time delay period (5 minutes) has passed. This safety feature protects the compressor from damage.

This manual is used for guidance and does not form part of a contract. NorthWind, Inc. reserves the right to make technical changes without prior notice. 1. Always place the unit on a level surface. 2. The unit shall be installed in accordance with national and local wiring regulations. 3. The unit must be connected to a correctly grounded power supply. For safety, this air conditioner is grounded

through the power cord plug when connected to a grounded wall outlet. Do not use an adapter plug or improperly sized extension cord.

4. Do not install the unit in an area where gas leakage may occur and/or in an explosive atmosphere. 5. Do not apply an insecticide or any type of flammable spray on the unit. 6. Do not start or stop the unit by inserting or pulling out the power plug. 7. The unit is not intended for use by children. Close supervision is necessary if unit is operated near children. 8. Do not insert anything into air inlet or outlet grilles. 9. Do not obstruct air inlet or outlet grilles. 10. If an abnormal odor or smoke comes out of the unit, disconnect the unit immediately and contact a qualified service technician. 1. Do not immerse the unit in water or any type of liquid. 2. Do not put a stove/grille, etc, where it would be exposed to the direct airflow. It may affect combustion. 3. Do not sit on the unit or place anything on it. 4. Always inspect the power cord for signs of damage before use. If the power cord is damaged, it must be replaced

by the manufacturer or a qualified service technician.

INSTALLATION GUIDELINES:

INSTALLATION 1 - 2 - 3

STANDARD FEATURES

All NorthWind units are designed with “corner post” construction. This permits convenient access to most components by removal of the right side panel(s) (viewed from the front). A separate electrical control box is located on the lower back panel. For easy access to the control components, simply remove 4 screws. The power supply cord can be stored in the cord storage compartment on the back panel. All panels are attached with machine screws into threaded fasteners. The unit interior consists of three sections: 1) The lower section containing the compressor, condensate removal system and primary electrical system, 2) The upper front section, containing the evaporator blower, coil, filter and grilles, 3) The upper rear section, containing the condenser blower, coil filter and grilles.

SERVICEABILITY

COMMERCIAL CABINET The “corner post” construction provides great strength and virtually no “cabinet flex”. Base pans, corner posts and se-lect interior panels are 12 gauge galvanized steel on models MAC1211/1811 and 11 gauge on models MAC60 and MAC90.. The exterior panels are 18 gauge CRS finished with exterior grade, weather resistant, high gloss, polyester TGIC powder coating. The interior sections are insulated with sound absorbent insulation for quiet and dry operation. A “Cord Storage Compartment” is located on the back panel near the electric service panel. It provides a convenient place to protect and store the power supply cord during transport. It also serves to protect and house the fan cycle switch and high pressure switch reset button on models MAC1211/1811.

THERMOSTATIC EXPANSION VALVE/CAPILLARY TUBE

NorthWind units are equipped with either a thermostatic expansion valve or capillary tube expansion system. Both ac-curately and efficiently control refrigerant flow.

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STANDARD FEATURES continued

CONSTANT PRESSURE EXPANSION VALVE /FREEZE STAT/HOT GAS BYPASS

Each NorthWind unit is provided with a constant pressure expansion valve, freeze stat or hot gas bypass to prevent frost formation on the evaporator coil. This is most useful when operating in high humidity conditions at low fan speeds and moderate to lower temperatures.

HIGH PRESSURE SAFETY SWITCH

Each NorthWind unit is equipped with a manual reset high pressure switch to protect the refrigeration system and compressor. The cut-out pressure for all models is 425 PSIG. If the system exceeds this pressure, the compressor will stop. When the system pressure drops to 300 PSIG or less, the reset button can be pushed to restart the compressor. THE RESET BUTTON IS LOCATED IN THE CORD STORAGE COMPARTMENT on models MAC1211/1811. The button is located behind the front service door on models MAC60 and MAC90. This protects the button from damage during transport and setup. The high pressure switch capillary line is attached to a schrader access valve on the liquid line. This allows replacement of a de-fective switch without recovering the refrigerant.

ADVANCED CONDENSATE REMOVAL SYSTEM

All 1, 1½, and 3 ton units are supplied with the Advanced Condensate Removal System. This system includes a 5 gallon tank and a high lift condensate pump. The user can choose be-tween the tank or pump with no wiring or electrical changes. Simply attach a short piece of 1/2 inch o.d. tubing (included with unit) from the evaporator drain pan outlet fitting and in-sert the other end into the inlet opening on the condensate pump. This system is located be-hind the door on the lower front panel of the unit. If the pump is used, the pump discharge line must run to a drain. If the tank is used, the water level control system shuts off the com-pressor and turns on the red “condensate alert” light when about 5/8 full.

The unit’s evaporator blower will continue operation at its selected mode. To resume cooling operation, the tank must be emptied. An adjustment screw, located behind the tank, can vary the cut-off switch. If a lighter weight (less water) is de-sired, turn the adjusting screw clockwise. Do not exceed 1 full turn counterclockwise.

VIEW LOOKING THROUGH DOOR WITH TANK REMOVED

Evaporator pan outlet 1/2 inch o.d.

Condensate pump water inlet

The water level microswitch turns off the compressor and condenser blower when the tank needs to be emptied. As condensate col-lects in the tank, it becomes heavier. When the spring pressure is exceeded by the weight of the tank, the adjusting screw lowers the

lever on the switch, closing the circuit to the “condensate alert” light and opening the circuit to the compressor and condenser blower. This switch operates on 24 volts.

WATER LEVEL MICROSWITCH

Water level adjustment screw and locknut

Microswitch mounted in unit

Spring and tray attachment

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CONDENSATE PUMP

Every NorthWind unit is provided with a condensate pump. The pump has a 20 foot lift, an internal check valve, and a safety float switch. The pump is securely mounted to the base pan with all primary wiring and piping factory finished. A con-densate discharge line is required when the pump is being used. When not used, the pump is simply in standby mode.

Condensate pump in unit models MAC1211/1811

CONDENSATE ALERT LIGHT, RED

Every NorthWind unit is equipped with a red Condensate Alert light. The light is lit when one of two conditions ex-ists: 1) The condensate tank is full. 2) The condensate cannot be pumped out of the condensate pump. 3) This requires pushing the reset button in the unit’s cord storage compartment (MAC1211/1811) or behind the front access door (MAC60/90), to restart the unit.

THERMOSTAT

Every NorthWind unit is equipped with an electromechanical thermostat operating on 24 volts. The dial on the unit control panel is in the off position when turned full counterclockwise. When turned full clockwise, the temperature setpoint will be approx. 55° F @ ± 4°. The temperature sensing function is through a remote bulb located in front of the evaporator coil, in the air stream.

POWER READY LIGHT, GREEN

All NorthWind units are equipped with a green “Power Ready” light. When lit, it indicates there is power at the recepta-cle. Even when the unit is in the “off” position, the light should be lit. If this light is “off”, there is no power available for the unit to run. Perhaps a fuse or circuit breaker should then be checked.

TIME DELAY RELAY

Each unit is equipped with an adjustable, low voltage time delay relay to protect the compressor from short cycling, which could cause internal damage. This device is “delay on break” actuated and is located in the electrical box on the lower back panel of the unit. The adjustment dial on the relay is factory set and should not need any further attention.

EVAPORATOR FAN RELAY/CONTACTOR

The evaporator fan relay controls the 2 speeds of the evaporator motor on models MAC1211/1811. The relay is SPDT with a 24 volt coil. Models MAC60/90 use a separate contactor for each speed using 24 volt coils.

CONTROL TRANSFORMER

The control transformer supplies 24 volts to the unit’s low voltage control system. It is a foot mounted, 40VA, multi-tap primary that is energized when the power cord is connected to a “hot” receptacle.

CONDENSATE PUMP TRANSFORMER

Used only on 480 volt 3 phase models, it provides 230 volts to power the unit’s condensate pump.

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24 volt transformer

Compressor Contactor

Power Terminal Block

Panel Ground

Compressor Time Delay Relay

Evaporator Fan Relay

ELECTRICAL PANELS

MAC1211/1811 panel MAC6034/9034 panel

Power Terminal Block

Phase Monitor

Condensate Pump Transformer

Control Transformer

Ground Lug

Compressor Contactor

Evap Hi-Speed Contactor

Evap Lo-Speed Contactor

Cond Fan Contactor

COMPRESSOR CONTACTOR

The compressor contactor supplies power to the compressor and the condenser blower when the thermostat calls for cooling. It has a 24 volt coil, with the amp rating and number of poles required for the specific model.

TERMINAL BLOCK

The terminal block has 3 terminals that provide a convenient wiring point for the power supply cord internal wiring and pri-mary grounding.

AUTOMATIC CONDENSER FAN CYCLE SWITCH

Every NorthWind unit is equipped with an automatic condenser fan cycle switch. At 260 PSIG the condenser blower switches on, automatically. When the load decreases and the pressure in the liquid line drops to 160 PSIG, the condenser blower turns off, automatically. The switch is mounted on a schrader access valve, and it can be replaced without recovering the refrigerant.

EVAPORATOR FAN CYCLE SWITCH

All of NorthWind’s units are equipped with an evaporator fan cycle switch. Located in the cord storage box (models MAC1211/1811) and behind the front access door (model MAC60/MAC90, when switched to “cycle” function, the evaporator blower turns on and off with the compressor. When switched to the “constant” function, the evaporator blower runs continuously. The constant function may help prevent air stratification as well as clean the air with the electrostatic filters.

EVAPORATOR FAN SPEED SWITCH

Each NorthWind unit is supplied with a 2-speed evaporator fan switch. Located on the unit’s control panel, the “High” speed selection runs the blower at maximum speed. The “Low” speed selection runs the blower at 20% less than high speed. The fan switch operates on 24 volts.

AIR FILTERS

All NorthWind units include an electrostatic air filter in the evaporator and condenser air handling systems. An electro-static filter imparts a small static charge to dirt particles passing through it. The media then captures this dirt much more efficiently than standard foam or aluminum mesh filters. Made of polymer coated polypropylene, the filters can be washed with mild detergent or backwashed with a garden hose.

ON-OFF SWITCH

The “ ON-OFF” switch provides a way to stop all electrical functions on the unit except the “Power Ready” light. If the unit is plugged in and there is power at the receptacle, the green light will be lit even if the power switch is in the “OFF” position. This lets the user know when the receptacle is live.

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EVAPORATOR & CONDENSER BLOWER MOTOR ASSEMBLIES

Each 1 and 1½ ton unit is equipped with a new technology external rotor, forward curved, squirrel cage blower for the evaporator and condenser sec-tions. The external rotor motor is totally enclosed, PSC, thermally protected, 2-speed, with sealed ball bearings, and dynamically balanced in 2 planes for reduced noise/vibration levels. The blower wheel is bolted to the rotating stator section, eliminating set screws. The double inlet design puts the motor section in the center of the wheel, leaving both air inlets free of any motor obstruction and in the air stream for cool efficient operation, unlike standard direct drive blowers. No oiling or mechanical servicing is required.

MAC60/90 models utilize belt drive blowers/motors which provide the increased air flow at very moderate noise levels. All motor pulleys are keyed to the shaft and secured with tapered style bushings. Blower pulleys are secured with tapered bushings, eliminating the need for set screws. The motors are solidly bolted to the motor mounting plate. Adjustment and belt tension are easily set by raising or lowering the plate and tightening the adjustment bolts.

Motor mounting plate

Adjustment rods

Belt adjustment/replacement is easy. Just loosen the nuts on the top and bottom of the motor plate, roll off the old belt...roll on the new one… tighten the bolts to ap-ply tension to the belt and motor plate.

Lock nuts on top and bottom of motor mounting plate

MAC60 condenser blower MAC60 evaporator blower

Inside view of MAC90 showing the arrangement of internal components.

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SERVICE CORD

Every NorthWind unit has a 10 foot long electrical service cord. On all required service cords, an electric protection device (LCDI/AFCI)* is included. This complies with the UL requirements issued August 1, 2004. There are no re-quirements for these devices on 3 phase units.

UNIT/MODEL PLUG CONFIGURATION RECEPTACLE

115 VOLT MAC1211, MWC1211

NEMA-5-15R

115 VOLT MAC1811 MWC1811

NEMA 5-20R

208/230/1 MAC2412

MWC2412, 3612

NEMA 6-20R

208/230/1 MAC3612 MWC6012

NEMA 6-30R

208/230/1 MAC6012

NEMA 6-50R

208/230/3 MAC3632 MWC3632

NEMA L15-20R

208/230/3 MAC6032 MWC6032

NEMA L15-30R

460/480/3 MAC3634 MWC3634

NEMA L16-20R

460/480/3 MAC6034 MWC6034

NEMA L16-30R

15A-125 VOLT NEMA 5-15P





20A-250 VOLT NEMA L15-20P



30A-460 VOLT NEMA L-16-30P

*LCDI (Leakage Current Detection & Interruption) AFCI (Arc Fault Circuit Interrupter)

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TREATED EVAPORATOR AND CONDENSER COILS

When environmental conditions are harsh and airborne contaminants are a problem, a degrading of the coil surfaces could occur. To help mediate this problem, coils could be treated with an optional acrylic or heresite coating. Please contact your distributor for suggestions and application assistance.

CONDENSER DUCT

If your unit is operating in an office, server/computer room or other finished space, condenser duct may be used to handle the hot condenser air or condenser make-up air. 12 inch round duct is used on the discharge of the MAC1211, 1811, and 3612/32. The MAC6012/32/34 use 1, 16 inch round duct. The MAC9032/34 use 2, 16 inch round duct.

CEILING PANEL/DUCT KIT ASSEMBLY

An optional ceiling discharge kit (CDK) may be used to discharge condenser warm air into a drop ceiling space. The CDK-12 consists of a 2' x 2' lay-in ceiling panel, 8 feet of flexible duct, and a 12 inch diameter duct flange that attaches to the top of the unit over the air discharge opening. The CDK-16 has similar components for larger, 16 inch diameter duct. Installation can be accomplished in 2 steps: 1) Place the 2' x 2' drop-in ceiling panel in the drop ceiling above the unit. 2) Attach the duct flange to the unit with the machine screws supplied with the kit. Installation is complete. Non-ventilated ceiling must be large enough to handle the warm air generated by the unit. Best case is to vent into only “VENTED” ceiling areas. Check your local codes for any special “drop ceiling space” requirements. Comply with all ordinances.

OPTIONAL FEATURES

COLD AIR DISCHARGE NOZZLE KIT

Optional nozzles are used to direct the cold evaporator air to specific areas or spots. Thus the term “spot” cooling was coined. Spot cooling is generally used in commercial and industrial applications such as production lines to cool people or processes, or to cool equipment that generates heat such as computers or telecommunication products. You may have seen them on the sidelines of sporting events to cool the athletes. The nozzles are made of Virgin white PVC 100, ribbon locked, bendable, self-supporting, resistant to corrosion/ rust, abrasion, solvents, acid and chemicals. The black tips (finishing rings) are made of soft plastic providing an attractive finish and protection from sharp edges. The nozzle construction is firm, and when aimed at a spot, the nozzle will maintain that position until changed. The NZ-5 is used on the MAC1211, 1811. It consists of 2, 5-inch nozzles with a compressed length of 16 inches and ap-proximate extended length of 24 inches. The NZ-6 is used on the MAC3612. It consists of 2, 6-inch nozzles with a compressed length of 16 inches and approximate extended length of 24 inches. The NZ-8 is used on the MAC6012, 32 and 34. It consists of 2, 8-inch nozzles with a compressed length of 16 inches and approximate extended length of 24 inches. The NZ-10 is used on the MAC9032/34. It consists of 2, 10-inch nozzles with a compressed length of 16 inches and ap-proximate extended length of 24 inches.

DUCT FLANGE

An optional duct flange can be attached to the condenser discharge (hot) air opening on the top of the unit. Round duct can then be attached to it. The CDF-12 (Condenser Duct Flange) is 12 inches in diameter and fits models MAC12 and 18. The CDF-16 is 16 inches in diameter and is included (installed) on models MAC60 and 90.

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CONDENSER AIR PLENUM

The CAP, Condenser Air Plenum, is used to eliminate negative air pressure in the conditioned space caused by exhausting the condenser air. The plenum attaches to the condenser inlet air opening on the side of the unit. They connect by removing the grille assembly and dropping in the plenum in its place. 12 inch round duct can then be routed from an exterior source and attached to the plenum flange. Additional duct may be attached to the condenser discharge flange for a totally ducted condenser section. Condenser air plenums can substantially reduce air noise and increase options for solving difficult and unusual cooling applications. All NorthWind units use a dedicated, automatic, 2 speed condenser blower controlled by the “load” or pressure in the high side of the refrigerant system. Another important topic to consider is the amount of duct that can be attached to a unit. Adding duct adds resistance to air-flow. Too much duct will prevent the unit from operating properly. For proper application, “equivalent feet” must be calcu-lated. To calculate equivalent feet, add the number of feet of duct on the inlet side of the blower (inlet air plenum) plus the number of feet on the discharge air side (duct connected to discharge air flange).

Then, for every 90° elbow in the ducting, add 6 feet to the calculation. Here is an example of an equivalent feet calculation: Number of feet of duct attached to discharge flange 15 Number of feet of duct attached to inlet plenum 20 Number of 90° elbows in discharge run, 1 (= 6 feet) 6 Number of 90° elbows in inlet run, 2 (= 12 feet) 12 Total equivalent feet 53

The following quick reference chart illustrates maximum equivalent feet and maximum E.S.P. (External Static Pressure) al-lowed for the condenser section of NorthWind units.

Condenser Plenum Model

Round Duct Size, Inches

Maximum Equivalent Feet

Maximum E.S.P.

CAP12 12 50 .50

CAP18 12 50 .50

CAP36 12 80 .60

CAP60 2-12 110 .70

CAP90 2, 16 120 .80

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EVAPORATOR DUCT ADAPTER

The evaporator duct adapter is used to transition the evaporator discharge opening to round duct. The standard grille can be lifted out of the opening and the adapter can be dropped in its place. By attaching duct to the adapter, cold air can be delivered to a location some distance from the unit.

Then, for every 90° elbow in the ducting, add 6 feet to the calculation. Here is an example of an equivalent feet calcu-lation: Number of feet of duct attached to discharge flange 15 Number of feet of duct attached to inlet plenum 20 Number of 90° elbows in discharge run, 1 (= 6 feet) 6 Number of 90° elbows in inlet run, 2 (= 12 feet) 12 Total equivalent feet 53

Evaporator duct adapters can substantially reduce air noise and increase the number of options used for solving diffi-cult and unusual cooling applications. All NorthWind units use a dedicated, automatic, 2-speed evaporator blower controlled by the fan speed switch mounted on the unit control panel. Another important topic to consider is the amount of duct that can be attached to a unit. Adding duct adds resistance to airflow. Too much duct will prevent the unit from operating properly. For proper application, “equivalent feet” must be calculated. To calculate equivalent feet, add the number of feet of duct on the inlet side of the blower (inlet air plenum) plus the number of feet on the dis-charge air side (duct connected to evaporator duct adapter).

This quick reference chart illus-trates maximum equivalent feet and maximum E.S.P. (External Static Pressure) allowed for the evaporator section of NorthWind units.

Evaporator Duct Adapter Model



Maximum E.S.P.

EDA12, 18 8 40 .50

EDA36 16 80 .50

EDA60 16 110 .70

EDA90 18 120 .90 EVAPORATOR AIR PLENUM

Evaporator Air Plenums are used to connect round duct to the evaporator inlet air of the unit. The plenum attaches to the unit by removing the grille and dropping in the plenum in its place on all models.

Then, for every 90° elbow in the ducting, add 6 feet to the calculation. Here is an example of an equivalent feet calculation: Number of feet of duct attached to discharge flange 15 Number of feet of duct attached to inlet plenum 20 Number of 90° elbows in discharge run, 1 (= 6 feet) 6 Number of 90° elbows in inlet run, 2 (= 12 feet) 12 Total equivalent feet 53

Evaporator air plenums can substantially reduce air noise and increase the number of options used for solving difficult and unusual cooling applications. All NorthWind units use a dedicated, automatic, 2 speed evaporator blower controlled by the fan speed switch mounted on the unit control panel. Another important topic to consider is the amount of duct that can be attached to a unit. Adding duct adds resistance to airflow. Too much duct will prevent the unit from operating efficiently. For proper application, “equivalent feet” must be calculated. To calculate equivalent feet, add the number of feet of duct on the inlet side of the blower (inlet air plenum) plus the number of feet on the discharge air side (duct connected to evaporator duct adapter).

The quick reference chart illustrates maximum equivalent feet and maxi-mum E.S.P. (External Static Pres-sure) allowed for the evaporator sec-tion of NorthWind units.

Evaporator Plenum Model



Maximum E.S.P.

EAP12 12 30 .40

EAP18 12 40 .50

EAP36 16 80 .50

EAP60 16 110 .70

EAP90 18 120 .90

APPLICATIONS

ROOM AIR CONDITIONER

NorthWind units can be used as room air conditioners to cool a room or confined space. This application requires using a CAP (Condenser Air Plenum) and a CDF (Condenser Duct Flange) to duct condenser air into the unit and duct condenser hot air out of the unit. If this ducting is not used, the space temperature will increase.

SPOT COOLER

NorthWind units may be used in open areas to cool specific “spots” through the evaporator grille, optional nozzles or duct adapter. Spot cooling can be an economical and convenient method to air condition where cooling the entire space is not practical, such as factory floors, warehouses, gyms, stadiums and similar large areas.

REMOTE COOLER

By using the optional EAP (Evaporator Air Plenum) and EDA (Evaporator Duct Adapter) it is possible to cool a space remotely. The Plenum and Duct Adapter permit ducting of the evaporator air. In drop ceiling applications the unit could be located in one room while ducting the supply and return air to another room. The “equivalent feet” guidelines must be observed.

AREA COOLER

When a unit is installed in an area that is not totally enclosed, the hot condenser air may be ducted out, allowing the evaporator air to cool the space. Consideration must always be given to the negative pressure created by the condenser air exhaust and its effect on space temperature.

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FAN ONLY OPERATION

When fan only operation is desired, turn the thermostat dial to desired comfort level and switch fan cycle switch to “constant” position. The fan cycle switch is located in the cord storage compartment on the unit’s back panel. With the switch in “constant” position, the evaporator fan will operate even when the call for cooling is satisfied. Select desired fan speed from the control panel. To cycle (turn off) the evaporator fan with the compressor, switch the fan cycle switch to “cycle”.

COOLING CYCLE

To operate the unit for cooling, plug the electric cord into a proper power supply. The green “power ready “ light should be lit. If the green light is not illuminated, there is probably no power at the outlet. Turn the temperature dial to the right (clockwise) to turn the unit on, selecting the desired comfort number. The unit will run until the call for cool-ing is satisfied. The temperature sensing bulb is located behind the evaporator filter and in front of the evaporator coil. This is the best position for sensing the room temperature. With the unit running, if the dial is turned to the left (counterclockwise) to turn the unit off, and then immediately turned to the right (clockwise), to turn it back on, the unit will not start. The time delay will not allow the unit to run until the delay period ends, usually 4 to 5 minutes. This is normal and protects the compressor from damage. If there is a power failure, the unit will resume operation when power is restored. No re-starting is required. Operation will be as though there was no power failure at all. No batteries of any kind are required for the thermostat or any operating function of the unit.

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REPLACEMENT PART PROCEDURES

THERMOSTAT

1. Disconnect unit from power/unplug power cord. 2. Remove evaporator inlet air grille on the front panel of unit. 3. Remove screws and clips that secure the thermostat sensing bulb. 4. Remove the unit’s top panel attaching screws. Lift panel 6 to 8 inches to reveal components on control panel. 5. Pull sensing bulb and tubing up and out from the evaporator coil area. 6. Mark and remove wires from ON/OFF Switch. 7. Mark and remove wires from Evaporator Fan Switch 8. Mark and remove wires from Condensate Alert Light and Power Ready Light. 9. With a small slotted screwdriver, remove thermostat dial set screw from shaft. Note: Set screw is always tightened

on FLAT section of shaft. Remove dial. 10. Remove switches and lights from control panel. 11. Remove instrument panel overlay by prying up the edges first, then pulling it completely off. 12. Remove 2 thermostat attaching screws; then remove thermostat. 13. Install new thermostat and attaching screws. Apply new overlay. 14. Snap in Fan Switch, ON/OFF Switch, and Green and Red light through new overlay. 15. Reconnect marked wires, guide thermostat bulb to mounting location and attach with clips. 16. Reinstall top panel & attaching screws; replace evaporator grille assembly.

EVAPORATOR BLOWER

CONDENSER BLOWER

1. Disconnect unit from power/unplug power cord. 2. Remove screws to top, right & left side panel, and remove. 3. Remove evaporator duct shroud. 4. Cut, mark and strip electric wires from blower motor for re-connection later. 5. Position top panel to permit blower removal. 6. Remove 1/4 inch countersunk screws and nuts from blower mounting brackets. 7. Remove blower mounting brackets from inoperative blower to new blower. 8. Install new blower in unit attaching 1/4 countersunk screws & nuts. 9. Connect new blower wires to stripped and marked wires. 10. After wiring, test to make sure new blower operates; then reassemble in reverse order. BELT DRIVE 1. Remove screws on top panel, remove right and left side panels, duct shroud and blower screen. 2. Loosen belt tension, remove belt, blower pulley, adjusting rods, blower motor and plate. 3. Remove 1/4 in nuts & bolts that attach blower cage to basepan and vertical partition. 4. Remove blower and cage assembly from unit through right side, lifting the cage over the unit wiring. 5. Remove nuts & bolts that attach blower to cage assembly; re-install new blower. 6. Reassemble in reverse order, and test for proper operation; reattach side panels & top.

1. Disconnect unit from power/unplug power cord. 2. Remove screws to top, right & left side panel, and remove. 3. Remove condenser duct shroud. 4. Cut, mark and strip electric wires from blower motor for re-connection later. 5. Position top panel to permit blower removal. 6. Remove 1/4 inch countersunk screws and nuts from blower mounting brackets. 7. Remove blower mounting brackets from inoperative blower to new blower. 8. Install new blower in unit, attaching 1/4 countersunk screws & nuts. 9. Connect new blower wires to stripped and marked wires. 10. After wiring, test to make sure new blower operates; then reassemble in reverse order. BELT DRIVE 1. Follow same procedure for evaporator blower except there is no blower screen to remove.

DIRECT DRIVE

DIRECT DRIVE

16

POWER READY or CONDENSATE ALERT LIGHT

CONDENSATE PUMP

EVAPORATOR FAN SWITCH and ON/OFF SWITCH

HIGH PRESSURE SWITCH

1. Disconnect unit from power/unplug power cord. 2. Remove attaching screws that secure the top panel. 3. Lift the top front panel about 6 inches to reveal the 2 wires that attach the light. The copper sensing tube for the thermostat will provide some resistance. This is normal. However, do not kink the tubing. 4. Cut the 2 wires, pull the tinnerman clip away from the panel, and push the light out the front of the panel. 5. Push the new light through the panel and secure with the tinnerman clip. 6. Strip the insulation on the 2 cut wires in the unit. Attach one light wire to one of the just stripped wires and the other light wire to the other just stripped wire. Secure with a wire nut or butt connector, and tape the nut and wire together for extra strength. 7. Reinstall top panel and screws.

1. Disconnect power supply /remove plug from receptacle. 2. Remove right side panel. 3. Loosen nuts/bolts on pump mounting brackets. 4. Remove pump electrical cover (1 Phillips screw). 5. Remove & mark wires on low voltage and line voltage float switches; check terminals for tightness & suitability. 6. Replace condensate pump, reattach wires, replace cover & screw, reinstall attaching bolts, reinstall side panel.

1. Disconnect unit from power/unplug power cord. 2. Remove attaching screws that secure the top panel. 3. Lift the top front panel about 6 inches to reveal the switch and the 2 wires attached to it. The copper sensing tube will provide some resistance. This is normal. However, do not kink the tubing. Note: Mark the wire located on the center terminal and the wire on the outer terminal. Remove the wires by pulling from the terminal. 4. With thumb and forefinger, squeeze the spring clips together that are on the LONG side of the switch and push the switch out from the back, through the front panel. 5. Reinstall the new switch by pushing it through the panel from the front until it snaps into place. 6. Reattach wires, taking note of which wire was on the center terminal and which wire was on the outer terminal. 7. Reinstall top panel and attaching nuts.

1. Disconnect unit from power/unplug power cord. 2. Remove attaching screws from right side panel; remove panel. 3. Remove 4 screws from electrical access panel on lower back panel. 4. Remove nuts/bolts attaching the high pressure switch to the panel. 5. Mark location of two blue wires; remove from terminals. 6. Follow the tubing from the high pressure switch to the flare nut which attaches it to the

schrader access valve. 7. Remove flare nut from access valve. A small, DeMinimus release of refrigerant may occur when separating the

components. This is normal. 8. Pull the tubing, nut and wires through the panels, removing the switch assembly. 9. Reinstall, reversing the procedure.

High Pressure Switch

17

CONDENSER FAN CYCLE CONTROL

PANEL MOUNTED RELAYS, CONTACTORS, TIME DELAY TRANSFORMER

1. Disconnect unit from power; unplug power cord. 2. Remove right side panel of unit. 3. Remove and mark 2 wires on terminals of cycle switch to assure correct reconnection. 4. Using a 9/16 flare tube wrench, remove switch from schrader access valve. A small, DeMinimus

release of refrigerant may occur when components are separated. This is normal. 5. Install new fan cycle switch and use reverse order to finish process. Condenser Fan

Cycle Switch

1. Disconnect power to unit, unplug power cord. 2. Remove 4 screws on the electrical cover located on the unit’s lower back panel. 3. Select control to be replaced, carefully marking wires for reattaching to new control. 4. Remove control from panel; reinstall new control. 5. Reconnect wires; reinstall panel cover.

Electrical Panel INSPECTION/REPAIR OF ELECTRICAL SYSTEM

1. Inspection of thermostat: Check for continuity across terminals 1 and 2, (C-12, C-21) and terminals 4 and 5 on C-17, when calling for full cooling (dial full clockwise) above 65°F. If continuity is broken across the terminals, replace the thermostat. 2. Inspection of fan speed switch: There should be continuity across the above terminals. If none, replace the switch. 3. Inspection of tank full switch: Depress the microswitch lever to check for continuity. If there is no continuity between common and normally open terminals, replace the switch. 4. Inspection of high pressure switch: Check for continuity across terminals 1 and 2 of the high pressure switch. At normal pressure when the unit is not operating, there is continuity across the two terminals. If continuity is interrupted across the terminals, replace the high pressure switch. 5. Inspection of compressor motor: Measure the resistance across the terminals of the compressor motor. Resistance between C-R at 70°F approximately 0.65 OHMS ± 10% Resistance between C-S at 70°F approximately 4.50 OHMS ± 10% Replace compressor when the resistance is not at these stated values. 6. Inspection of compressor overload : Check for continuity across overload’s two terminals. At normal room temperatures, there is continuity across the two terminals. If no continuity exists, replace the overload. 7. Inspection of compressor and fan motor capacitors: Before and after the test, always short across the two terminals to discharge electric charge. Set the ohmmeter to 100 OHMS range and place its two probes against the two terminals of the capacitor. At first, the ohmmeter should indicate zero OHMS, then the meter reading should gradually approach infinity. If the ohmmeter shows infinity from the outset or the meter reading does not move from zero OHMS, replace the capacitor.

SWITCH POSITION CONDUCTING TERMINALS

High Speed Center & Left Terminal

Low Speed Center & Right Terminal

Back View of Switch

CAUTION: DISCONNECT POWER TO UNIT PRIOR TO INSPECTION

18

TROUBLESHOOTING GUIDE

The following procedures are recommended when correcting the indicated problems. Routine clean-ing and maintenance can be performed by anyone. Service and repair should be performed only by a qualified refrigeration service person.

PROBLEM: THE ENTIRE UNIT DOES NOT RUN. Green light not lit. 1. CAUSE: POWER INTERRUPTION REMEDY: Check external power supply. Look for blown fuse or open circuit breaker. Replace fuse/reset breaker. Check to make sure no other power consuming equipment is on the same circuit as the unit. PROBLEM: THE ENTIRE UNIT DOES NOT RUN. Green light lit. 1. CAUSE: THERMOSTAT INOPERABLE REMEDY: Setting may be too high to call for cooling. Lower set point by turning temperature dial clockwise. Tighten or replace any loose or broken wire on thermostat. Replace thermostat if defective. 2. CAUSE: ELECTRICAL PANEL: a) contactor coil defective, contacts stuck open, burned or dirty. b) loose wires. REMEDY: Correct as follows: (a) Tighten /replace loose wire terminals. (b) Replace contactor PROBLEM: EVAPORATOR FAN RUNS BUT COMPRESSOR AND CONDENSER FAN DO NOT START. 1. CAUSE: Low Voltage REMEDY: Check power supply for voltage outside the range of 106-126 on 115 volt models and 187-253 volts on the 208/230 volt units. 2. CAUSE: Thermostat REMEDY: Check for loose wires on the thermostat. Tighten wires, wait for time delay (3-5 minutes), then restart unit. 3. CAUSE: High Pressure Switch opened circuit. REMEDY: Push high pressure switch button (located in cord storage compartment) to reset switch. Make sure condenser coil is not obstructed; there should be 8 inches of clearance from condenser inlet air opening and wall. Make sure condenser filter is clean and open. Replace HP switch if defective or bypass to test. Make sure electrical connections are tight and secure. 4. CAUSE: Compressor contactor open or burned. REMEDY: Replace if necessary. 5. CAUSE: Refrigerant Leak; no freon. REMEDY: Locate leak and repair. Evacuate unit and recharge. 6. CAUSE: Loose or defective wires. REMEDY: Tug on wires to see if they pull away from the connections, including compressor. Repair/Replace any wires & terminals as required. 7. CAUSE: Open or shorted run capacitor. REMEDY: Repair or replace. 8. CAUSE: Defective “condensate alert” cut-out switch. REMEDY: Check and replace. 9. CAUSE: Condensate tank could be full, but red alert light could be defective. REMEDY: Replace light. 10. CAUSE: Defective compressor. REMEDY: Check for shorts, opens and grounds. Remove & replace compressor. Recharge. Test run.

19

PROBLEM: COMPRESSOR STARTS & RUNS, BUT EVAPORATOR FAN DOES NOT RUN.

1. CAUSE: Loose wires on fan speed switch or fan cycle switch. REMEDY: Check for loose wires, repair/replace as required. 2. CAUSE: Defective fan speed switch. REMEDY: Remove/replace fan switch. 3. CAUSE: Defective fan cycle/constant switch in cord storage compartment. REMEDY: Remove & repair switch. 4. CAUSE: Shorted or open fan motor capacitor. REMEDY: Remove/replace capacitor. 5. CAUSE: Open fan motor coil (winding). REMEDY: Remove/replace evaporator blower. 6. CAUSE: Defective fan relay, burned contact or defective pull-in coil. REMEDY: Remove/replace relay.

PROBLEM: INSUFFICIENT COOLING 1. CAUSE: Insufficient air flow through evaporator coil due to: A. Dirty air filter B. Dirty evaporator coil C. Obstructed evaporator inlet air REMEDY: A. Remove filter grille assembly, wash filter or clean with vacuum. B. Remove obstruction. 2. CAUSE: IMPROPER SIZING OF UNIT. REMEDY: Make sure unit is properly sized for load (application). Add supplemental unit(s) as required. PROBLEM: NOISY OPERATION 1.CAUSE: Copper tubing vibrating. REMEDY: Adjust by bending copper tubing slightly to a new, firm position. Segregate tubes touching cabinet or each other. 2. CAUSE: Loose cabinet or internal component. REMEDY: Check, tighten loose screws. 3. CAUSE: Unit vibrating out of level. REMEDY: Re-position so it is level with the floor. 4. CAUSE: Object dropped into evaporator or condenser blower. REMEDY: Turn unit off, inspect blower housings for foreign objects; remove and restart unit. 5. CAUSE: Loose blower mounting bolts. REMEDY: Tighten bolts, restart blower. 6. CAUSE: Defective external rotor motor. REMEDY: Remove/replace blower assembly. 7. CAUSE: Loose or misaligned blower/motor pulley/belts on belt drive units. 8. CAUSE: Loose set screws on blower pulley or blower motor pulley. REMEDY: Inspect, repair/tighten/replace set screws to eliminate noise. 9. CAUSE: Defective/worn motor mount rings. REMEDY: Repair/replace motor mount rings.

20

PROBLEM: WATER LEAKING FROM UNIT 1. CAUSE: Leaky drain pan. REMEDY: Locate and repair leak with proper sealant. 2. CAUSE: Loose drain hose connection or hole in hose. REMEDY: Locate hole; replace hose if necessary. Tighten hose clamp. 3. CAUSE: Did not replace tank after emptying. REMEDY: Replace tank to collect water properly. 4. CAUSE Tank improperly installed. REMEDY: Make sure water collection hole tank is in the UP position. 5. CAUSE: Defective condensate pump or excessive lift on pump. REMEDY: If pump lift exceeds 20 feet, a higher lift pump will be necessary. Make sure check valve is operative, safety float is not energized, and discharge line is not plugged or crimped. Change pump if necessary. Pump will operate against 20 feet of water head pressure. If a combination of vertical height and horizontal drain line exceeds 20 feet of water pressure drop, problems will occur.

PREVENTIVE MAINTENANCE GUIDE

All NorthWind units are designed to last and give maximum performance/reliability with minimum maintenance. To extend the life of the unit, a few simple procedures must be performed. 1. BLOWER MOTORS The external rotor motor and blower wheel is a balanced/bolted assembly requiring no maintenance. It is used in the MAC1211, MAC1811. Belt drive motors and blowers use pulley set screws and should be checked for tightness whenever the side panel is removed for cleaning/maintenance. Belts should be inspected twice a year. All bearings are sealed and permanently lubricated.

2. FILTERS Every NorthWind unit is equipped with enhanced particle capture electrostatic filters (condenser and evaporator). Anti-microbial protection is imbedded in the fiber and cannot be washed out. They are impervious to harsh conditions, UV protected, nonreactive to chemicals/corrosive conditions and nonporous (will not absorb from the environment). How-ever, they must be kept clean. Clogged filters reduce airflow and the efficiency of the system. Some environments require filter cleaning every 2 weeks. Others, every 6 weeks. Clean as often as your conditions require. The evaporator filter is located behind the evaporator grille, in the front panel. The filter and grille can be easily lifted out of the unit. Once out of the unit, the filter can be sprayed with detergent and hosed off with water. Just shake off the ex-cessive water and reinstall. The condenser filter is located behind the condenser grille on the left side of the unit. Clean and reinstall using the same method as with the evaporator filter.

3. CONDENSATE PUMP Follow these steps when servicing the condensate pump: 1. Disconnect power before servicing pump or any other component. 2. Make sure the floats move up and down freely and smoothly. Listen for the clicks of the switches. 3. Remove tank cover, clean volute and bottom of tank. Warm water, detergent or humidifier cleaner can be used to remove any mineral deposits. 4. Make sure check valve moves freely and is free from any obstruction, particle or mineral buildup. 5. Inspect drain tubing for obstruction, dirt or kinks that could impede water flow. Clean and correct as necessary.

END OF SEASON STORAGE 1. Remove all water from the condensate tank. 2. Clean evaporator and condenser filters. 3. Remove any water from condensate pump sump and tank. 4. Turn the thermostat dial full counterclockwise (warmest position). Turn the unit on and run 2 hours in constant fan mode to completely dry out the filters and inside components. 5. Roll up the power cord and store in the cord storage box. 6. Store in a dry location. 7. Pack in original carton for extra protection.

21

Condenser discharge shroud. Helps attenuate air noise by creating a small plenum.

Heavy duty belt drive condenser blower with multiple attachments to blower support frame.

Heavy duty drive com-ponents utilizing tapered pulley bushings rather

11 gauge base pan.

Fully and easily adjust-able motor mounting bracket

Quiet, powerful belt drive blower motor

Evaporator discharge shroud. Helps attenuate air noise by creating a small plenum.

Heavy duty belt drive evaporator blower with multiple attachments to blower support frame.

Electrical panel

Cord storage box

Evaporator coil, en-hanced fin, rifled tube, 14 FPI.

Pitched evaporator condensate pan.

Condensate pump

INSIDE VIEW OF MAC 60

Behind the convenient front access door are the schrader service ports, high pressure re-set button, evaporator fan cycle/constant switch and the high lift condensate pump.

Our 5 and 7½ ton units are equipped with heavy duty 6 inch diameter swivel casters and brakes.

The rear casters have swivel locks to help when transporting, loading/unloading or maneuvering into position.

22

2 speed Evaporator Blower (external rotor) Evaporator Coil Constant Pressure expansion valve Thermostatic expansion valve Condensate tank Condensate Pump 12 gauge base pan Industrial 3½ inch casters

Condenser coil Fan Cycle Condenser blower (external rotor) Corner post Liquid line drier 12 gauge support pan Compressor Accumulator Electrical box

12 gauge support beam

INSIDE VIEW OF MAC1811

23

24 V

208/230

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH

EVAPORATOR FAN SPEED

LOW

HIGH

MAC6012 WIRING DIAGRAM June 4, 2007

Line Voltage 230V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

R

C

S

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSER CONTACTOR

L1

L2

T1

T2

24v24v

EVAP FAN LOW CONTACTOR

CONDENSER BLOWER MOTOR

24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

T2

24v24v

EVAP FAN HIGH CONTACTOR

EVAPORATOR BLOWER MOTOR

2-SPEED

L1L2GROUND

POWERTERMINAL

V

L2

L1 T1

T2

208/230/1

L1L2

RUNCAP

L2

L1

L2

L1

1

1

1 2 2 51

13

4

4

5

6

6

7

7

13

3

3

3

3

8

8

8

8

8

8

2

2

2

2

2

2

2

2

9

9

12

1211

11

10

10

24

24 V

208/230

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH


LOW

HIGH

MAC6012 WIRING DIAGRAM Sep 12, 2007

Line Voltage 230V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

R

C

S

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSER CONTACTOR

L1

L2

T1

T2

24v24v



24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

T2

24v24v



2-SPEED

L1L2GROUND

POWERTERMINAL

V

L2

L1 T1

T2

208/230/1

L1L2

RUNCAP

L2

L1

L2

L1

1

1

1 2 2 51

13

4

5

6

6

7

7

13

3

3

8

8

8

8

8

8

2

2

2

2

2

2

2

2

9

9

12

1211

11

10

10

1

2

3

4 5

6

7

8

Blue

White

Blue

White

1 and 2 fromremote thermostat connect here

WITH REMOTE THERMOSTAT

REMOTE THERMOSTAT TERMINAL BLOCK

25

24 V

208/230

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH


LOW

HIGH

MAC6032/9032 WIRING DIAGRAMApril 2, 2007

Line Voltage 230V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

T3T1

T2

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSER CONTACTOR

L3 T3

L1

L2

T1

T2

24v24v


L3 T3

CONDENSER BLOWER MOTORL1 L2 L3

Y Y C

PHASE MONITOR

Out

24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

L3

T2

T3

L1

L2

T1

24v24v


L3 T3

T2


2-SPEED

L1 L2 L3

GROUND POWERTERMINAL

V

208-230/3/60HZ

26

24 V

208/230

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH


LOW

HIGH

MAC6032/9032 WIRING DIAGRAM

September 10, 2007

Line Voltage 230V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

T3T1

T2

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSERCONTACTOR

L3 T3

L1

L2

T1

T2

24v24v


L3 T3

CONDENSER BLOWER MOTORL1 L2 L3

Y Y C

PHASE MONITOR

Out

24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

L3

T2

T3

L1

L2

T1

24v24v


L3 T3

T2


2-SPEED

L1 L2 L3


V

REMOTE THERMOSTAT OPTION

1

2

3

4 5

6

7

8

Blue

White

Blue

White


208/230/3/60HZ

27

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH


LOW

HIGH

MAC6034-9034 WIRING DIAGRAMJune 16, 2007

Line Voltage 230V/460V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

T3T1

T2

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSER CONTACTOR

L3 T3

L1

L2

T1

T2

24v24v


L3 T3


L1 L2 L3

Y Y C

PHASE MONITOROut

24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

L3

T2

T3

L1

L2

T1

24v24v


L3 T3

T2


2-SPEED

L1 L2 L3


440/460/3/60HZ

460 V

230 V

460 V

24 V

440/460/3/60HZ

28

4

6 51

3 2THERMOSTAT

13

TIMEDELAY

G

POWER READY

R

CONDENSATE ALERT

CONDENSERFAN SWITCH


CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH


LOW

HIGH

MAC6034-9034 WIRING DIAGRAMJune 16, 2007

Line Voltage 230V/460V

Low Voltage 24V

ON

OFF

CYCLE

CONSTANT ON

T3T1

T2

COMPRESSOR

L1

L2

T1

T2

24v24v

CONDENSER CONTACTOR

L3 T3

L1

L2

T1

T2

24v24v


L3 T3


L1 L2 L3

Y Y C

PHASE MONITOROut

24v

L1

L2

T1

24v

COMPRESSORCONTACTOR

L3

T2

T3

L1

L2

T1

24v24v


L3 T3

T2


2-SPEED

L1 L2 L3


440/460/3/60HZ

460 V

230 V

460 V

24 V

440/460/3/60HZ WITH REMOTE THERMOSTAT

1

2

3

4 5

6

7

8

Blue

White

Blue

White



29

24vL1 L2

T1 T2

24v

COMPRESSORCONTACTOR

24 V

120/1/60

4

6 5

1

3 2

THERMOSTAT

1 3

TIMEDELAY

G

POWER READY

R

TANK FULL

C

R

S

O

COMPRESSOR

STARTASSIST

STANDARD ONMAC1811 ONLY

1 3

2

CONDENSER FAN SPEED

EVAP FAN CYCLE

CONSTANT ON


CONDENSERBLOWER MOTOR

EVAPORATORBLOWER MOTOR

POWER PLUG120/1/60

POWER CORD

BLACK

WH

ITE

GREEN

EVAPORATOR FAN RELAY

31

4

5

2

CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH

BLUE

RED

BLACK

WHITE

BROWN

RED

BLACK

BLUE

WHITE

BROWN

CONDENSATE TANK FULL


LOW

HIGH

MAC1211-1811 WIRING DIAGRAM October 16, 2006

Line Voltage 115V

Low Voltage 24V

ON

OFFON/OFF

120/1/60HZ

30

24vL1 L2

T1 T2

24v

COMPRESSORCONTACTOR

24 V

120/1/60

4

6 5

1

3 2THERMOSTAT

1 3

TIMEDELAY

G

POWER READY

R

TANK FULL

C

R

S

O

COMPRESSOR

STARTASSIST

STANDARD ONMAC1811 ONLY

1 3

2

CONDENSER FAN SPEED

EVAP FAN CYCLE

CONSTANT ON


CONDENSERBLOWER MOTOR

EVAPORATORBLOWER MOTOR

POWER PLUG120/1/60

POWER CORD

BLACK

WH

ITE

GREEN

EVAPORATOR FAN RELAY

31

4

5

2

CONDENSATE PUMP

NC

NO

COM

PUMP FLOATSWITCH

BLUE

RED

BLACK

WHITE

BROWN

RED

BLACK

BLUE

WHITE

BROWN

CONDENSATE TANK FULL


LOW

HIGH

MAC1211-1811 WIRING DIAGRAM October 16, 2006

Line Voltage 115V

Low Voltage 24V

ON

OFFON/OFF

120/1/60HZ

1

2

3

4 5

6

7

8

Blue

White

Blue

White

7 and 8 from remote thermostat connect here


Blue

White

WITH REMOTE THERMOSTAT

31

EVAPORATOR COIL

CONDENSER COIL

COMPRESSOR SUCTIONACCUMULATOR

HIGHPRESSURE SWITCH

CONDENSER BLOWER SPEED SWITCH

THERMOSTATIC EXPANSION VALVE

CONSTANT PRESSURE EXPANSION VALVE

LIQUID LINEFILTERDRYER

1/4 OD EXTERNALEQUALIZER LINE

ACCESS PORT

ACCESS PORT

October 18, 2006

or CAPILLARY TUBE

or FREEZE CONTROL

32

June

14,

200

7

* A

CR

S A

dvan

ced

Con

dens

ate

Rem

oval

Sys

tem

. Thi

s sys

tem

util

izes

a h

igh

lift c

onde

nsat

e pu

mp

and

a 5

gallo

n ta

nk.

MO

DE

L

MA

C12

11

MA

C18

11

MA

C24

12

MA

C36

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33

REMOTE THERMOSTAT OPTION

All MAC models are capable of being factory equipped to operate with a remote located 24 volt thermostat. When this option is used, the unit’s thermostat remains in the unit but no longer controls. Control is transferred to the re-mote thermostat through the remote terminal block located behind the electrical access panel. CAUTION: Do not attach any power or “live” wiring to the terminal block. The unit’s internal 24 volt power sys-tem will operate the remote thermostat. EASY TO WIRE: The 2 wires from the remote thermostat are routed through the cord storage box, through the neo-prene bushing and attached to terminals 1 and 2 on the remote thermostat terminal block. Terminal 7 (blue) and ter-minal 8 (white) complete the circuit for the remote thermostat. No additional wiring required. CAUTION: Do not remove or change the wires on terminals 3 (white) and 4 (blue). They must remain connected.

TO REVERT TO UNIT’S INTERNAL THERMOSTAT: When the remote thermostat is no longer required it is easy to convert to internal thermostat con-trol. Simply move the white wire from terminal 8 to terminal 6. Then move the blue wire from terminal 7 to terminal 5. This completes the circuit for using the unit’s thermostat.

MAC60 CONTROL BOX

CORD STORAGE BOX

NEOPRENE BUSHING FOR REMOTE THERMOSTAT WIRES

ATTACH REMOTE THERMOSTAT WIRES HERE

CONTROL BOX

WIRING DIAGRAM & INSTRUCTIONS


34

35

DISCLAIMER All information and technical specifications presented in this service/installation manual are subject to change or modification without prior notification of any kind.

1291 Brummel Avenue Elk Grove Village, IL 60007 Phone 847-364-8600 Fax 847-364-8601

LIMITED WARRANTY

NorthWind, Inc. (the manufacturer) warrants to the origi-nal owner that the product will be free from defects in ma-terial or workmanship for a period not to exceed one (1) year from date of installation. If, upon examination by the manufacturer the product is shown to have a defect in ma-terial or workmanship during the warranty period, the manufacturer will repair or replace, at its option, that part of the product which is shown to be defective. The manufacturer further warrants that the product’s com-pressor motor will be free from defects in materials and workmanship for five (5) years from the date of installa-tion. If, upon examination by the manufacturer the product is shown to have a defect in materials or workmanship during the warranty period, the manufacturer will repair or replace, at its option, that part of the product which is shown to be defective. The electrostatic filters supplied with the unit are warranted for a period of (5) five years from date of installation when used under normal conditions. Electrical parts (such as relays, thermostats, overloads, capacitors, blower motors etc.) and the sealed refrigeration system (condenser and evaporator) are included in the one year limited warranty, but not with the five year limited warranty of the compressor. This limited warranty does not apply to:

This limited warranty is conditional upon:

5) To any workmanship of the installer of the product.

1) shipment, to the manufacturer, of that part of the product thought to be defective. Goods can only be returned with prior written approval from the manufacturer. All parts returned must be shipped freight prepaid.

2) determination, in the reasonable opinion of the manufacturer that there exists a defect in material or workmanship.

If the product has been subjected to misuse or neglect, has been accidentally or inten-tionally damaged, has not been installed, maintained or operated in accordance with the furnished written instructions, or has been altered or modified in any way.

For any expenses, including labor or material, incurred during removal or reinstallation of the product.

1)

3)

2)

If the finish of the cabinet or other appear-ance parts are damaged due to wear.

Repair or replacement of any part under this limited warranty shall not extend the duration of the warranty with respect to such repaired or replaced part beyond the stated warranty period.

THIS LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EITHER EXPRESSED OR IMPLIED, AND ALL SUCH OTHER WARRANTIES, INCLUDING/WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE HEREBY DISCLAIMED AND EX-CLUDED FROM THIS LIMITED WARRANTY. IN NO EVENT SHALL THE MANUFACTURER BE LIABLE IN ANY WAY FOR ANY CONSEQUENTIAL, SPECIAL OR INCIDENTAL DAMAGES OF ANY NATURE WHATSO-EVER, OR FOR ANY AMOUNTS IN EXCESS OF THE SELLING PRICE OF THE PRODUCT OR ANY PARTS THEREOF FOUND TO BE DEFECTIVE. THIS LIMITED WARRANTY GIVES THE ORIGINAL OWNER OF THE PRODUCT SPECIFIC LEGAL RIGHTS. YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY BY EACH JURISDICTION.

Drive belts on all belt drive units.

4)

36

Documents

1291 Brummel Avenue Elk Grove Village, IL 60007 Phone 847 ... 6032.pdf · vice life of the units can be extended by following the installation and preventive maintenance instructions