Weil-McLain CGA Series 2 Manual page 50

CGa Series 2 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers
Figure 30 Control module connections
High voltage to
pilot spark electrode
to Spill Switch and to
Additional limits, if used Yellow
4
24 VAC
control
circuits
09006
50
White
120 VAC H
Black
120 VAC N
Brown
TSTAT
POWER
TSTAT CIRC
LIMIT
DAMPER
FLAME
SENSOR GND
POWER
TSTAT/
CIRC
LIMIT
DAMPER
PILOT MAIN
FLAME
CIRC
SENSOR GND
TRANSFORMER
Y
OUTDOOR SENSOR
10
Outdoor Sensor
11
(if used)
Test Button for LP Ignition reset.
Pink or Blue
24 VAC
Brown or Yellow
Transformer
5
to
TSTAT
Connector plug
in vent damper
7
120 VAC to circulator
8
Sense wire to flame sensor
3
POWER
120 VAC IN
2
Transformer
1
High voltage to spark electrode
5
TSTAT
Thermostat
6
24 VAC vent damper connections
4
24 VAC to control circuits
9
Boiler Supply Temperature Sensor
(continued)
3
120 VAC IN
From end switch
(Constant)
Red
24 VAC
Black
24 VAC to
vent damper
24 VAC call for heat
24 VAC Common
Green
Yellow
Yellow
120 VAC H
White
120 VAC N
7
120 VAC to circulator
8
Flame sense wire to pilot
Green
to Ground
Thermistor 1
Thermistor
Common
Thermistor 2
9
Boiler Supply
Temperature sensor
Part Number 550-142-900/0519