ACCESSORY KIT INSTALLATION INSTRUCTIONS ECONOMIZER DAMPER AND HOOD MOD ELS 2EE04707924 / 2EE04708024 1EH0417 / 1EH0418 FOR 15, 17.5, 20, AND 25 TON ROOF TOP UNITS Gen eral This instruction provides the necessary information to properly field-install economizer dampers and hood assembly on 15, 17 ½, 20 and 25 ton single package rooftop units. The damper accessory provides the return air and outdoor air dampers and actuator for economizer operations. Contained in this kit are all rain hood components. Kit In cludes: B E A F C D Figure 1: Economizer Kit Qty Item # Description Qty Item # Description 1 A Fresh Air Hood w/ (3) Fil ters 1 E Top Flange 1 B Adap tor Panel Fresh Air (20 and 25 Ton Units) 1 F Damper Extension (20 and 25 Ton Units) 1 C Economizer Damper 1 Bag of Screws 1 D Re turn Air/Out door Air (RA/OA) Di vider NOTE: To ease installation, read all instructions prior to assembling economizer kit. Tools Re quired: 5 16 Hex Socket Driver Socket Drive Extension 7 16 Hex Socket Driver Hammer 3 8 Hex Socket Driver Awl Drill for self-drilling screws (recommended cordless) Tube of Silicone Rubber (Clear) Unitary Products Group 1
Damper As sem bly Procedures CAUTION When installing dampers, use care to avoid damage to filters or coils located in the adjacent compartment. 1. Remove the four access panels (two OA, one RA, and one filter shown in Figure 2) by using a 7 16" hex socket to loosen he screws securing the rotating latches and a 5 16" hex socket to remove the four screws on the bottom of each panel. Figure 4: Panel Latch Note: Retain the "O" rings which provide the seal between the panel and unit bottom. RETURN AIR ACCESS DOOR WARNING If the return air duct cover has been removed, install a covering over the open hole to prevent personal injury or equipment damage. 2. Remove the support brackets on 20 and 25 ton rooftop units. Refere to Figure 5. FILTER ACCESS DOOR FRESH AIR ACCESS DOOR Figure 2: Rooftop Unit Figure 5: Removing Support Bracket Figure 3: Installed Components Use a 5 16" hex socket to remove the top screws securing the support bracket located between the return air and outdoor air compartments. Use a 5 16" hex socket to remove the top screws securing the corner support bracket. 2 Uni tary Prod ucts Group
CAUTION Lift the roof when removing the support bracket to prevent tearing the roof seal. Use a 3 8" hex socket to remove the two inside top and bottom screws. Save the screws and bracket for installation later. Remove the RA duct panel covering the RA opening if it has not already been removed by the installing contractor. Refer to Figure 6. With the identification label facing up in the lower left corner of the damper, position the lower edge of the damper on the bottom pan. Lift the Economizer Damper up past the top flange and pull the Economizer Damper towards you until the damper is positioned in the bottom track. Rest the Economizer Damper on the top flange. Fasten the Damper to the top flange using pilot holes and self-drilling screws provided. Refer to Figure 8. No fastening to the bottom track is required. Figure 6: RA Duct and Screw Locations 4. Install the Economizer Damper: Inside the top lip, align the holes of the top flange with the holes in the lip. Use the self-drilling screws provided to secure the top flange to the lip. Install the screws from outside the unit as shown in Figure 7. Figure 8: Securing Damper to Top Flange 5. On 20 and 25 ton units install the two support brackets previously removed. Refer to Figure 9. Figure 7: Installing Top Flange Figure 9: Re-Installing Center Support Bracket Unitary Products Group 3
CAUTION Lift the roof when installing the support brackets to prevent tearing the roof seal. Using the 1 8" foam tape supplied, apply a length that will fit on the diagonal edge of the RA/OA divider. Refer to Figure 12. Align the bottom holes, lift the roof and rotate the bracket to a vertical position. Use the screws previously removed from each bracket to secure. 6. Securing the Economizer Damper: Using the 1 8" foam tape supplied, measure and cut a length that will fit the long edge of the damper frame that will rest against the access panel. Refer to Figure 10. Figure 12: Applying Tape to Divider Figure 10: Foam Tape Installation Location 7. Use a 5 16" driver to remove the 2 screws located in the floor flange between the return air and outdoor air compartments and save for future use. Refer to Figure 11. Slide the divider into position against the economizer damper. Use the 2 screws removed in step 7 to secure the RA/OA divider to the floor flange. Refer to Figure 13. Use two self-drilling screws to secure the OA/RA divider to the support bracket. Use 4 self-drilling screws to secure the RA/OA divider to the Economizer Damper frame using the pilot holes provided. Fill the gap at the base of the divider with ¾ foam tape provided. Figure 11: Flange Screws 8. Install the RA/OA divider: Remove the return air/outdoor air divider from its packing material. Figure 13: Installing Divider 4 Uni tary Prod ucts Group
On single enthalpy units, mount the enthalpy sensor to the metal surface on the RA/OA divider. On dual enthalpy units, mount the second enthalpy sensor on the opposite surface in the return air. Use two self-tapping screws to secure. ACTUATOR Figure 16: Component Location on RA/OA Figure 14: Installing Cable Assemblies 9. Mounting Sensors and wire harness: ECONOMIZER BOARD Cut the wire tie securing the cable harness to the damper. Insert the 15 pin connector to the unit economizer plug near the filters. Uncoil the remaining wiring harness and route through the round hole in the top flange. Allow the wires to hang in the OA compartment. TABLE 1: Sensor Connection Table Sensor Type (Terminal) O.A. 24V O.A. (+) O.A. (-) All Units (Wire Color) Field Supplied Terminal Location 24V OAH Com R.A. 24V 823 / Red TB4-3 R.A. (+) 825 / White RAT+ R.A. (-) 824 / Black RAT- Dis charge Air 371 / White SAT+ 373 / Black SAT- Logic Mod ule Eco Board UCB UCB Make all wiring connections as shown in Table 1. Locate the discharge air sensor mounting location on the heating section wall. Mount the sensor bracket provided using one self-tapping sheet metal screw. Refer to Figure 17. Figure 15: Routing Cables Figure 17: Installing Discharge Air Sensor Unitary Products Group 5
Insert the wire harness into split grommets and push the grommets through each hole that the wires pass. Refer to Figure 18. Figure 19: Installing Blank-Off Section 13. Damper Assembly is now complete. Proceed to the hood assembly instructions. Figure 18: Grommet Installation Locations Use tie wraps to bundle the wires and secure to the top flange and RA/OA divider as shown in Figure 15 on page 5. IMPORTANT When using the wire harness, insert a loop between the two tie wraps so that the wire harness does not rub on the damper frames during operation. Economizer Hood Assembly Procedures Note - To ease installation, read all instructions prior to assembling economizer hood kit. CAUTION Care must be take when using cordless drivers that the screws do not strip the metal take holes. 1. Take the fresh air access door with hood assembly and place back in position and secure in place with hardware provided. See Figure 20. 12. For 20 and 25 ton units only: Remove the blank-off section from the packaging. Using the 1 8 foam tape supplied, apply a length that will fit on the long edge of the blank-off section which contacts the access panel. Insert the blank-off section through the side access opening of the OA compartment. Refer to Figure 19. Use the pilot holes on the top flange for the self drilling screws provided to secure the top of the blank-off section to the top flange. Install ¾ foam tape around the cut-out for the vertical support bracket. Figure 20: Installing Assembled Fresh Air Hood 6 Uni tary Prod ucts Group
2. Install adaptor panel fresh air (B) under unit top panel and over the flange of the fresh air hood top (A). Secure with two #10-½" x 16 screws provided. See Figure 21. (20 & 25 Ton Units) 3. Seal all seams and edges with silicone caulk (not provided). A B Figure 21: Installing Adaptor Panel Unitary Products Group 7
Supercedes: None Sub 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. 1183427-UAI-A-1014 Unitary 5005 Norman Products York OK Group Drive 73069