•Installation •
Figure 34 GCM (control module) harness plug receptacle and indicator light locations.
White |
| White | White | |
120 VAC N |
| 120 VAC N | 120 VAC N | |
Green | White | Green | Green | |
120 VAC N | ||||
Ground | Ground | Ground | ||
Black | Green | Black | Black | |
120 VAC H | Ground | 120 VAC H | 120 VAC H | |
| Black | to System | to Bypass | |
| 120 VAC H | |||
| circulator | circulator | ||
|
| |||
|
| (long harness) | (short harness) | |
120 VAC IN |
|
| 120 VAC | |
|
|
| to circulators | |
| 120 VAC to |
|
| |
| blower motor |
| Red wires to | |
|
|
| pressure switch | |
White |
|
|
| |
120 VAC N |
|
|
| |
|
|
| Blue wires to | |
Black |
|
| gas valve | |
|
|
| ||
120 VAC H | Yellow wires |
|
| |
| to limit control |
|
| |
| and block temp |
|
| |
| switch |
|
|
120 VAC to | Black wires to | |
transformer | ||
thermostat circuit | ||
|
POWER |
TSTAT CIRC |
LIMIT |
PRES SWITCH |
FLAME |
Indicator lights
24 VAC control
circuits
120 VAC IN
120 VAC to transformer
120 VAC to blower motor
120 VAC to circulators
24 VAC control circuits
water temp sensor
24 VAC from transformer
120 VAC to igniter
Black leads 
to water
temperature sensor
water temp
sensor
24 VAC
Brown | Red |
|
|
24 VAC from transformer
120VACN | 120VACH | ||
| White |
| Black |
|
|
|
|
85051120 VAC to igniter
Part number | 71 |
