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Gen eral

This instruction provides the necessary information toproperly field-install economizer dampers and hoodassembly on 15, 17 ½, 20 and 25 ton single packagerooftop units.

Kit In cludes:

Figure 1: Economizer Kit

Unitary Products Group 1

Qty Item # Description Qty Item # De scrip tion

1 A Economizer Hood Right Side Panel 1 P Bot tom Track

1 B Economizer Hood Left Side Panel 1 Q Top Flange

2 C Fresh Air Di vider 1 R Re turn Air (RA) Damper

1 D Fresh Air Hood Top 1 S Re turn Air/Out door Air (RA/OA) Di vider

2 E Lower Fil ter Bracket 1 T Out door Air (OA) Damper with Ac tu a tor

1 F Adap tor Panel Fresh Air (20 and 25 Ton Units) 1 U Damper Ex ten sion (20 and 25 Ton Units)

3 G Economizer Fil ter 1 Bag of Screws

NOTE: To ease installation, read all instructions prior to assembling economizer kit.

Tools Re quired:

ECONOMIZER DAMPER AND HOODMOD ELS 2EE04702024 / 2EE04703824 / 2EE04703924

2MD04702524 / 2MD04702624 / 2MD04702824 / 1EH0411 / 1EH0412FOR 15, 17.5, 20, AND 25 TON ROOF TOP UNITS

The damper accessory provides the return air and outdoorair dampers and actuator for economizer operations.Contained in this kit are all rain hood components.

AC CES SORY KIT IN STAL LA TION IN STRUC TIONS

U

S

Q

P

T

R

A

D

C

B

E

C

F

G

G

G

l 516” Hex Socket Driver

l 716” Hex Socket Driver

l 38” Hex Socket Driver

l Drill for self-drilling screws (recommended cordless)

l Socket Drive Extension

l Hammer

l Awl

l Tube of Silicone Rubber (Clear)

Figure 2: Rooftop Unit

Figure 3: Installed Components

Figure 4: Panel Latch

Figure 5: Removing Support Bracket

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Damper As sem bly Procedures

2. Remove the support brackets on 20 and 25 tonrooftop units.

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WARNINGIf the return air duct cover has been removed, install a covering over the open hole to prevent personalinjury or equipment damage.

CAUTIONWhen installing dampers, use care to avoid damage to fi lters or coils located in the adjacentcompartment.

l Use a 516" hex socket to remove the top screws

securing the support bracket located between thereturn air and outdoor air compartments.

l Use a 516" hex socket to remove the top screws

securing the corner support bracket.

Note: Retain the "O" rings which provide the sealbetween the panel and unit bottom.

1. Remove the four access panels (two OA, one RA, andone filter shown in Figure 2) by using a 716" hex socket

to loosen he screws securing the rotating latches anda 5

16" hex socket to remove the four screws on thebottom of each panel.

FILTER ACCESS DOOR

FRESH AIR ACCESS DOOR

RETURN AIR ACCESS DOOR

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CAUTIONLift the roof when removing the support bracket toprevent tearing the roof seal.

Figure 6: RA Duct and Screw Locations

Figure 7: Installing Bottom Track

l Position the bottom track so that clearance holes in the bottom track can match the unit hole pattern. Use andawl to align the holes.

4. Remove the RA Damper and the top flange from theirpacking materials.

Figure 8: Installing Top Flange

5. Install the RA Damper:

l Inside the top lip, align the holes of the top flange withthe holes in the lip.

l Use the self-drilling screws provided to secure the topflange to the lip. Install the screws from outside the unitas shown in Figure 8.

Figure 9: Connecting Linkage

l Remove the nuts attached to the swivel ball joints onthe linkage arm. Retain for future use.

l Align the two swivel ball joints attached to the linkagearm with the crank arms attached to the RA damperblades.

l Insert the swivel ball joints into the top holes of thecrank arms and secure with nuts.

l Remove the RA duct panel covering the RA opening ifit has not already been removed by the installingcontractor.

3. Install the bottom track:

l Refer to Figure 6 and remove the 8 screws for 15tons or 11 screws for 20 and 25 ton units, securingthe drip and bottom pans along the bottom inside of the unit. Save the screws for installation later.

l Use a 3 8" hex socket to remove the two inside top andbottom screws. Save the screws and bracket forinstallation later.

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Figure 11: Positioning Return Air Damper

Figure 13: Installing OA Damper

Figure 14: Initial Damper Frame Alignment

Figure 15: Re-Installing Center Support Bracket

Figure 12: Securing Damper to Top Flange

l Fasten the Damper to the top flange using pilot holesand self-drilling screws provided. Refer to Figure 12.No fastening to the bottom track is required.

l Slide the RA Damper to the left until the seal contactsthe heating compartment wall.

l With the identification label facing up in the lower leftcorner of the damper, set the bottom of the OA damperinto the bottom track from the filter access area.

l Lift the top of the OA damper up past the top flange and push the damper towards the RA damper along thebottom track, and rest it on the top flange.

l To aid the installation of the damper assembly, slidethe OA damper to the left until the frame overlaps theRA damper frame as shown in Figure 14.

6. Install the OA Damper:

l Remove the outdoor air damper from the packingmaterial.

Figure 10: Installing Return Air Damper

l With the identification label facing up in the lower leftcorner of the damper, position the lower edge of thedamper on the bottom pan.

l Slide the RA Damper on the edge of the bottom panuntil the bottom flange of the damper is past the bottom track.

l Lift the RA Damper up past the top flange and pull theRA Damper towards you until the damper is positioned in the bottom track.

l Rest the RA Damper on the top flange.

l Use two 716" wrenches to tighten and secure the swivelball joints.

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Note: At this time, the RA and OA damper frames willnot overlap.

l Fasten the OA damper to the top flange using theself-drilling screws and pilot holes provided. Use anawl to align the holes.

Figure 19: Connecting Linkage Rod

Figure 20: Flange Screws

Figure 17: Positioning OA Damper

Figure 18: Damper Frame Alignment

l Remove and keep the nut attached to the swivel balljoint on the linkage arm.

l Align the swivel ball joint attached to the actuatorlinkage arm with the crank arm attached to the damperblade. This procedure will open the RA damper bladeswhile the OA damper blades will remain in the closedposition.

Note: FOR 25 TON Units, Attach Damper ExtensionArms (provided) to the Actuator Crank Arm andOutdoor Damper Pivot Arm.

l Insert the swivel ball joint into the bottom hole of thecrank arms and secure with nut.

l Use two 716" wrenches to tighten and secure the swivelball joint.

7. On 20 and 25 ton units install the two supportbrackets previously removed.

CAUTIONLift the roof when installing the support brackets toprevent tearing the roof seal.

l Align the bottom holes, lift the roof and rotate thebracket to a vertical position.

l Use the screws previously removed from each bracket to secure.

8. Securing the OA Damper:

Figure 16: Foam Tape Installation Location

l Using the 18" foam tape supplied, measure and cut a

length that will fit the long edge of the damper framethat will rest against the access panel.

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l Use 4 self-drilling screws to secure the RA/OA dividerto the RA damper frame using the pilot holes provided.

l Fill the gap at the base of the divider with ¾” foam tapeprovided.

l On single enthalpy units, mount the enthalpy sensor tothe metal surface on the RA/OA divider. On dualenthalpy units, mount the second enthalpy sensor onthe opposite surface in the return air. Use twoself-tapping screws to secure.

Figure 23: Installing Cable Assemblies

11. Mounting Sensors and wire harness:

l Cut the wire tie securing the cable harness to thedamper.

l Insert the 15 pin connector to the unit economizer plugnear the filters.

Figure 24: Routing Cables

l Use the 2 screws removed in step 9 to secure theRA/OA divider to the floor flange.

l Use two self-drilling screws to secure the OA/RAdivider to the support bracket.

9. Use a 516" driver to remove the 2 screws located in thefloor flange between the return air and outdoor aircompartments and save for future use.

Figure 21: Applying Tape to Divider

10. Install the RA/OA divider:

l Remove the return air/outdoor air divider from itspacking material.

l Using the 18" foam tape supplied, apply a length that

will fit on the diagonal edge of the RA/OA divider.

Figure 22: Installing Divider

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Figure 27: Grommet Installation Locations

l Locate the discharge air sensor mounting location onthe heating section wall. Mount the sensor bracketprovided using one self-tapping sheet metal screw.

Figure 28: Installing Blank-Off Section

When using the wire harness, insert a loop betweenthe two tie wraps so that the wire harness does notrub on the damper frames during operation.

IMPORTANT

l Insert the wire harness into split grommets and pushthe grommets through each hole that the wires pass.

l Use tie wraps to bundle the wires and secure to the topflange and RA/OA divider as shown in Figure 24 onpage 6.

Figure 25: Component Location on RA/OA

l Uncoil the remaining wiring harness and route through the round hole in the top flange. Allow the wires to hang in the OA compartment.

Figure 26: Installing Discharge Air Sensor

TABLE 1: Sensor Connection Table

Sen sor Type(Ter mi nal)

15, 17.5, 20 and 25Ton Units

(Wire Color)

Logic Mod ule(Ter mi nal)

Enthalpy

O.A. (+) PUR PLE +o

O.A. (-) RED So

R.A. (+) BLUE +R

R.A. (-) OR ANGE SR

Dis charge AirTem per a ture

2 LeadsT

T1

l Make all wiring connections as shown in Table 1.

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CAUTIONCare must be take when using cordless drivers thatthe screws do not strip the metal take holes.

12. For 20 and 25 ton units only:

l Remove the blank-off section from the packaging.

l Using the 18” foam tape supplied, apply a length that

will fit on the long edge of the blank-off section whichcontacts the access panel.

l Insert the blank-off section through the side accessopening of the OA compartment.

l Use the pilot holes on the top flange for the self drillingscrews provided to secure the top of the blank-offsection to the top flange.

l Install ¾” foam tape around the cut-out for the verticalsupport bracket.

13. Damper Assembly is now complete. Proceed to thehood assembly instructions.

Economizer Hood As sem bly Pro ce dures

Note - To ease installation, read all instructions priorto assembling economizer hood kit.

Figure 29: Installing Economizer Hood Side Panels

LOCATION OF GASKET

A

B

E

Note - Place 18 x ½ gasket as shown in Figure 29 to both side panels (A,B) before installing.

3. Install the economizer hood right side panel (A)aligning the matching holes in flange with the holes onthe right side of fresh air access door. Insert and fasten five screws supplied with the hood kit. Use a 516" driveto tighten screws. See Figure 29.

4. Install the economizer hood left side panel (B) aligningthe matching holes in flange with the holes on the rightside of fresh air access door. Insert and fasten fivescrews supplied with the hood kit. Use a 5

16" drive totighten screws. See Figure 29.

5. Remove the packing materials from parts. Align lowerfilter bracket (E) holes against inside of hood right sidepanel (A) and hood left side panel (B). Secure with#10-½" x 16 screws provided. See Figure 29.

COVER PANEL REMOVED

FRESH AIR ACCESS DOOR

1. Remove the cover panels by using a 516" hex drive toremove the screws securing the cover panels. SeeFigure 29.

2. Remove the economizer hood parts from the inside offresh air section of unit and remove the packingmaterials from parts.

Figure 30: Installing Divider Panels

A

B C

C

LOCATION OF GASKET

Note - Place 18 x ½ gasket as shown in Figure 30 to both hood sides over slots where fresh air dividers(C) are inserted.

6. Remove the packing materials from parts. Insert upper fresh air divider panel (C) between hood right sidepanel (A) and hood left side panel (B). See Figure 30.

7. Align tabs of divider panel (C) and insert into slots inhood right side panel (A) Repeat for hood left sidepanel (B). See Figure 30.

Note - Do Not forget the gasket material that shouldhave been applied before Step 4.

8. Repeat Step 6 and 7 for installing upper fresh airdivider panel (C). See Figure 30.

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Note - Place 18 x ½ gasket as shown in Figure 31 to

flange that are against the unit on fresh air hood top (D) before installing.

9. Place fresh air hood top (D) over hood right side panel(B) and secure with #10-½" x 16 screws provided. SeeFigure 31.

10. Bend tabs down on divider panels (C) either by hand or gently tapping with a rubber mallet. This must be doneto assure the hood structure. See Figure 31.

11. Take the fresh air access door with hood assemblyand place back in position and secure in place withhardware removed in Step 1. See Figure 32.

Figure 31: Installing Fresh Air Hood Top

A

B

C

C

D

LOCATION OF GASKET

BEND TABS DOWN

Figure 32: Installing Assembled Fresh Air Hood

A

B

C

C

D

Figure 33: Installing Adaptor Panel & Filters

F

B

D

G

G

G

12. Install adaptor panel fresh air (F) under unit top paneland over the flange of the fresh air hood top (D).Secure with two #10-½" x 16 screws provided. SeeFigure 33. (20 & 25 Ton Units)

13. Seal all seams and edges with silicone caulk (notprovided).

14. Install the economizer filters (G) inside the threesections of the economizer hood assembly. SeeFigure 33.

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Unitary Products Group 11

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Unitary 5005 NormanProducts York OKGroup Drive 73069

Supercedes: 035-19854-000-B-0105Sub ject to change with out no tice. Printed in U.S.A.Copy right © by Uni tary Prod ucts Group 2005. All rights re served.

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