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OPERATION SEQUENCE-G23(X) -5 and -6 MODELS WITH SURELIGHT CONTROL
1 - When there is a call for heat, W1 of the thermostat en-
ergizes W of the furnace control with 24VAC.
2 - S10 primary limit switch and S47 rollout switch are
closed. Call for heat can continue.
3 - Surelight control energizes combustion air blower B6.
Combustion air blower runs until S18 combustion air
prove switch closes (switch must close within 2-1/2
minutes or control goes into 5 minute Watchguard
Pressure Switch delay). Once S18 closes, a 15-sec-
ond pre-purge follows.
4 - Surelight control energizes ignitor. A 20-second
warm-up period begins.
5 - Gas valve opens for a 4-second trial for ignition.
6 - Flame is sensed, gas valve remains open for the heat
call.
7 - After 45-second delay, Surelight control energizes in-
door blower B3.
8 - When heat demand is satisfied, W1 of the indoor ther-
mostat de-energizes W of the Surelight control which
de-energizes the gas valve. Combustion air blower
B6 continues a 5-second post-purge period, and in-
door blower B3 completes a selected OFF time delay.
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