GF - A 3
Furnace Sequences Of Operation
Communication Mode
18. The IFC then signals the variable speed
inducer drive to ramp up the vent motor in
steps. As the vent motor speed increases the amount
of gas coming through the gas valve will increase.
The IFC will also increase the indoor blower motor
speed.
19. The communicating comfort control will
continue to monitor the indoor temperature and send
signals to the IFC to modulate the heating capacity
or turn off to maintain the homeowner’s set point.
20. Once the communicating comfort control senses
that the heating requirements have been satisfied, the
gas valve will be de-energized and gas flow will
cease. The variable speed vent motor will de-
energize approximately after a 5 second post purge.
All pressure switches will open and the indoor
blower motor will then run the heat off delay that is
selected in the User Interface menu.
Indoor Blower motor operation thermostat fan
switch “ON”
The communicating comfort control signals a
continuous fan call. The factory setting is 50% of the
cooling cfm selected but can be adjusted from 25% -
100% through the Installer Setup menu on the
communicating comfort control. If the outdoor unit
is a 2 stage system, the factory setting is 50% of the
2nd stage cooling cfm. If the outdoor unit is a 24 volt
single stage cooling system, the factory setting is
50% of the cooling cfm.
Note:
If the actual relative humidity (RH) is at or below the
set-point, the fan will run until the continuous fan call
is removed or the actual RH exceeds the set-point. If
the actual RH is above the set-point, the fan will not
turn on. See the communicating comfort control
Installer’s Guide for additional information.
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