McQuay CHB Installation Manual

Installation & Maintenance Data IM 375-2

Damper Motor Kit - CHF/CHB

Group: Damper Motor Kit
Part Number: 107134100

Date: June 1999

This damper motor kit is for field installation in conjuction
with the fresh air kit into the CHF and CHB units. The fresh air
kits must be ordered separately. Listed below are the right­and left-hand damper motor kit numbers, the unit sizes, the
correct rod length, and the corresponding fresh air kit num-

DAMPER MOTOR

KIT NUMBER UNITS KIT NUMBER

00484642 -01 -02 S03 5.5" (140 mm) 0061337501
00484642 -01 -02 S04 8.5" (216 mm) 0061337501
00484642 -01 -02 S06 10.0" (254 mm) 0061337502
00484642 -01 -02 S08 15.0" (381 mm) 0061337502
00484642 -01 -02 S10 15.0" (381 mm) 0061337503

RIGHT-HAND LEFT-HAND

Parts List

ITEM NUMBER PART DESCRIPTION QUANTITY

1 Damper control rod 1
2 Coupling 1
3 Screw, TR. HD. PHL. #10A x 0.50" (13 mm) 4
4 Setscrew — #10-32 x 0.375" (10 mm) 2
6 Motor and conduit 1
8 Bracket 1
9 Screw, #8-32 x 0.375" (10 mm) 2

10 Conduit and connections 1

1. Before installing the fresh air kit (not included with the
damper motor kit), remove the nuts and washers from
both sides of the damper blade, Figure 3.

bers. Damper motor is always mounted on the same end as
the unit control box. The unit control box is always mounted
on the opposite side of the coil connections. (Example: right­hand unit use left-hand damper and the correct items.

CHF/CHB

ROD LENGTH

FRESH AIR

7. Place the other end of the damper rod into the coupling
already attached to the fresh air kit. Do not tighten the
setscrew at this point.

2. Install the coupling, Item 2, on the end of the damper
blade, Item 5, closest to the unit control box. With the
damper blade in the closed position, the setscrews, Item
4, should be facing the front. See Figure 1 or 2.

3. Install the fresh air kit as shown in IM 374, supplied with
that kit.

4. Cut damper control rod, Item 1, to correct length (see
table above). Make sure unit size and rod length go
together. Deburr ends of the rod.

5. Attach the damper motor, Item 6, to the mounting
bracket., Item 8, with two #8-32 x 0.375" (10 mm)
screws, Item 9. See Figure 1 or 2.

6. Slide the damper rod through the 0.50" (13 mm) diam­eter hole in the unit subbase. See Figure 1 or 2. Place the
damper motor assembly in the proper unit end compart­ment, attach the damper rod to the motor coupling, and
tighten the setscrew.

8. Attach the damper motor assembly to the unit end piece
with two #10 x 0.50" (13 mm) sheet metal screws, Item

3. See Figure 1 or 2.

9. With the fresh air damper blade in the closed position,
tighten the setscrew to the damper rod.

10. Manually open the fresh air intake box damper blade and
let the spring return on the damper motor close the
damper blade. If it binds, loosen the two screws holding
the damper motor bracket to the end piece and adjust
the assembly until the spring will close the damper
blade. Retighten the screws.

11. Attach one end of the conduit to the electrical connector
on the damper motor and the other end to the control
box.

12. Wire the damper motor into the electrical circuit. Three
typical wiring diagrams are shown in Figure 5.

©1999 McQuay Incorporated

Figure 1. Right-hand unit shown

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➃

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End piece

Base

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