10 G
G77x Intermittent Pilot Ignition Controls Technical Bulletin
Main Burner
Ground
Pilot
Gas Supply
Pilot Burner
Assembly
Flame Sensor
Limits in Thermostat
Line Only
Thermostat
Transformer
Power
Supply
Main
Valve
Pilot
Valve
Rollout
Switch
Ignition Control
SENSE 4
MV 3
PV 1
R1R.O. SWH
THS 2
5
GROUND
Figure 7: Wiring Diagram for G77x with Rollout Switch Terminal
The rollout switch is wired into the G77x ignition control at terminal R1
(see Figure 7). The rollout switch (a normally closed set of contacts) is
positioned to detect flames rolling out of the combustion chamber. If
rollout occurs, the switch contacts open and the G77x immediately goes
into a lockout condition, closing the main and pilot valves so that the
system is not allowed to function.
The thermostat contacts must be opened for 30 seconds, then closed to
escape the lockout condition. When the rollout switch contacts have
returned to the closed position, the G77x will start its operating sequence
when the thermostat contacts close.
Rollout Switch
Function
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