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18-A. WIRING DIAGRAM: 2100 / IO-100 Single-Stage: Fenwal 35-60 DSI
If installing remote control kit JP-1235-RK refer to wiring diagram in the remote control
manual
Fenwal Control Terminal Designation
TH
Thermostat / 24V Supply Input
GND
System Ground
V1
Valve Power
V2
24V Supply Neutral
NC
Alarm
S1
Remote Flame Sensor
Error Mode
Internal Control Failure
Flame with No Call for
heat
Ignition Lockout
Fault Conditions:
The LED will flash on for 1/4 second, then off for
1/4 second during a fault condition. The pause
between fault codes is 3 seconds.
35
LED Indication
Steady on
2 flashes
3 flashes
2100 / IO-100 Manual
IM110107
RD: AUG 2021
R.L. 11A
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