3DJH
OPERATION SEQUENCE-G23(X) -1, -2, -3 and -4 MODELS
1 - When disconnect is closed, 120V is routed through
door interlock switch (S51) to feed the line voltage
side of the blower control (A3) and transformer T1
primary. Door interlock switch must be closed for
A3 and T1 to receive voltage.
2 - T1 supplies 24VAC to terminal 24VAC on A3. In
turn, terminal R of A3 supplies 24VAC to termi-
nal RC of the indoor thermostat (not shown).
3 - When there is a call for heat, W1 of the thermostat
energizes W of the furnace control with 24VAC.
4 - CAB of the blower control energizes the combus-
tion air blower (B6). When the combustion air
blower nears full speed, combustion air prove
switch (S18) closes.
5 - When S18 closes, assuming the flame rollout
switch (S47) primary limit (S10) and secondary
limits (S21) are closed, the ignition control opens
the pilot valve and begins spark.
6 - When flame is sensed, spark stops and main valve
opens to light main burners.
7 - After 45 seconds, blower control (A3) energizes
the indoor blower.
8 - When heat demand is satisfied, W1 of the thermo-
stat de-energizes W of the furnace control and the
furnace control immediately de-energizes the gas
valve. The combustion air blower immediately
stops. Also, the indoor blower runs for a desig-
nated period (90-330 seconds) as set by jumper on
blower control.
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