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53Part number 550-141-850/0699
• Installation • Start-Up • Parts • Maintenance
POWER
TSTAT CIRC
LIMIT
PRES SWITCH
FLAME
Field wiring
Factory wiring
Service
switch
(not
provided)
Junction box,
boiler left side
Thermostat
leads, through
jacket left side
Service
switch
(notprovided)
Thermostat
or end switch
(notprovided)
Thermostat
or end switch
(not provided)
Black White Green
Ground screw Wire nuts
Black Black
120 VAC
Hot
Neutral
Ground
WW
W
WW W
WW
W
G
G
B
Y
Y
Y
Y
Y
Y
B
B
B
BB
B
BB B
RR
BB
B
GG G
GG
G
W
R
R
R
R
W
B
BR
BR
B
BL
BL
BL
BL
Red
hose
White
hose
Air pressure
switch
Transformer
Block
temperature
limit switch
Water
temperature
limit switch
Blower
motor
Gas
valve
Hot surface
igniter
GCM
Water
temperature
sensor
System circulator Bypass circulator
85029
Plug-in connectors
Red
White
120 VAC hot/neutral
Low voltage (colors vary)
Ground connectors
Figure 24 Schematic wiring diagram