White Rodgers Integrated Control - Thermostat; White Rodgers Ignition Control Board - A.O. Smith SERIES 120 Service Handbook

WHITE RODGERS INTEGRATED CONTROL - THERMOSTAT

WHITE RODGERS IGNITION CONTROL BOARD

Diagnostic LED Error
Flash Codes are
Displayed Here
Servicing should only be performed by a Qualifi ed Service Agent
OPERATION AND SERVICE
Display
LED Label
Display
LEDs
To Upper
Temp.
Probe
E3
To Ignition
Control
E1
Board
E4
To Lower Fuse
Temp. Probe
Figure 17
1 4
2 5
3 6
1, 3, 6 -
From Thermostat
2 - Flame Probe
7, 10 -
Blower Prover Switch
8 - Ground
9, 12 -
To Gas Valve (24 VAC)
Figure 18
E2
Pin Number
Label
7 10 4 3 2 1
8 11
9 12
4, 2 -
3, 1 -
120 VAC Neutral
to Thermostat
21
Temperature
Adjustment
Dial
ECO Manual
Reset Button
120 VAC from
Ignition Control
Board
120 VAC
Hot to
Thermostat
120 VAC Hot
from On/Off Switch
120 VAC Neutral
from On/Off Switch
To Igniter (80-120 VAC)
To Blower (120 VAC)