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Form CP-OPT-GMK (6-16), P/N 208831 R3, Page 1

Instructions for Installing Replacement Gear Motor Kit

Applies:

 Modulating Gas Control Options AG39, AG40, AG41 & AG42 

on Model Series SC & Model Series RP

Form CP-OPT-GMK (6-16)

Gear Motor Replacement Kit includes a new factory-assembled flue 

duct and combustion air damper with a factory-wired gear motor 

installed plus three new replacement gaskets

Sizes 100, 125, 

150, 175, 200, 

225,250, 300 

Size 400

Kit P/N

208474

208475

Components:

Qty

P/N

P/N

Factory-assembled and Wire Flue Duct and Combustion Air 

Damper Assembly with Gear Motor (See 

FIGURE 1

)

1

207975

207976

Cover Plate Gasket

1

41996

Venter Seal Gasket

1

44695

Flue Outlet Duct Gasket

1

31900

Obsoletes RZ-NA CP-OPT-GMK (Version A)

This kit is designed to replace the solenoid actuator with a gear motor on heaters 

equipped with a modulating gas control Option AG39, AG40, AG41 or AG42. To 

facilitate replacement, the new flue duct, combustion air damper and gear motor is 

factory-assembled and wired for change out.

Application / 

Components

FIGURE 1 

Gear Motor Replacement Kit includes Factory-Assembled & Wired Flue Duct & Combustion Air Damper 

Assembly with Gear Motor, P/N 207975 or P/N 207976 & three Replacement Gaskets.

Flue Outlet Duct Gasket

, P/N 31900 

Use when attaching the new flue duct 

assembly to the collection box. 

(

NOTE:

 Be sure to reuse the restrictor plate.)

Venter Seal Gasket

P/N 44695

Use when 

re-installing 

venter 

housing on 

side of flue 

duct

Cover Plate 

Gasket

P/N 41996

Use when 

reattaching cover 

plate

Time Delay Relay

P/N 206146

with brown wire attached to 

Terminal 7 in the heater control 

compartment

15 MFD 

Capacitor

P/N 206145

Terminal Block 

Connections 85, 86 

and 87

Gear Motor

P/N 206144

with damper 

linkage

Black wire from the 

NO

 

terminal on lower end-switch 

attaches to Terminal 88 in the 

heater control compartment

Lower End 

Switch

Purple wire from the 

NO

 

terminal on upper 

end-switch attaches to 

Terminal 88 in the heater 

control compartment

Upper End Switch

Flue Duct with 

Combustion Air 

Damper

Warning:

 This replacement kit is to be installed by a qualified agency in accordance 

with these instructions and in compliance with all codes and requirements of 

authorities having jurisdiction. Failure to follow instructions could result in death, 

serious injury and /  or property damage. The qualified agency performing this work 

assumes responsibility for this installation.

Summary of Contents for SC Series

Page 1: ... Wired Flue Duct Combustion Air Damper Assembly with Gear Motor P N 207975 or P N 207976 three Replacement Gaskets Flue Outlet Duct Gasket P N 31900 Use when attaching the new flue duct assembly to the collection box NOTE Be sure to reuse the restrictor plate Venter Seal Gasket P N 44695 Use when re installing venter housing on side of flue duct Cover Plate Gasket P N 41996 Use when reattaching co...

Page 2: ...k wire that connects the combustion damper lower end switch to Terminal 88 c Remove the flue duct cover plate from the flue duct and damper assembly Model SC Series only Disconnect the rubber tubing from the sensing probe on the flue duct cover plate d Remove the flue duct combustion air damper and solenoid actuator as an assembly Remove the screws attaching the flue duct to the collection box and...

Page 3: ...of the new combustion damper upper end switch Connect the orange wire from the heater control compartment Terminal 84 to the common terminal of the new combustion air damper lower end switch Connect the purple wire from the normally open terminal of the new combustion air damper upper end switch to Terminal 88 in the heater control compartment Connect the black wire from the normally open terminal...

Page 4: ...illustrations subject to change without notice and without incurring obligations Nortek Global HVAC LLC 2016 All rights reserved All marks are the property of their respective organizations O Fallon MO I Printed in U S A 6 16 FORM CP OPT GMK 6 16 PN208831 R3 ...

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