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S9240F2051 MODULATING INTEGRATED FURNACE CONTROL
RUN MODE (2-STAGE THERMOSTAT):
1ST OR 2ND STAGE CALL FOR HEAT.
ALL INPUTS MONITORED (LIMIT, PRESSURE,
CALL FOR HEAT/COOL, FLAME LEVEL).
69-2807—01
3. Call for Heat Satisfied
2nd Stage Heat
2nd Stage
Call for Heat
satisfied?
Inducer speed switched
to Mid speed
Adjust Circulator to
appropriate speed
1st Stage Heat
1st Stage
Call for Heat
satisfied?
Gas valve
De-Energized
Inducer OFF
20 second Post Purge
Circulator OFF
after OFF Delay
1
– OR –
Wait for Call -
2-Stage Thermostat
Fig. 11. S9240F IFC sequence Call for Heat Satisfied (Run Mode) cycle.
3A
3B
RUN MODE (SINGLE STAGE THERMOSTAT):
ALL INPUTS MONITORED (LIMIT, PRESSURE,
CALL FOR HEAT/COOL, FLAME LEVEL).
NO
YES
NO
YES
after
4
Wait for Call -
Single Stage Thermostat
20
M28156
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