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18.5
BLOWER "ON" AND "OFF" TIMINGS
Blower on/off delays are handled by ECM motor programming. The control de-energizes the ECM heat signal
IOM
IOM
when the gas valve de-energizes. Features of this ECM variable speed motor are that it will deliver a constant
airfl ow within a wide range of external static pressures, and also includes:
Soft Start: This ECM variable speed motor will slowly ramp up to the required operating speed. This feature in
the heating cycle allows the heat exchanger to reach operating temperature before the set heat speed, which
minimizes noise and increases comfort.
Soft Stop: At the end of the heating or cooling cycle, the ECM variable speed motor will slowly ramp down.
This feature allows for increased energy effi ciency, and reduced noise levels.
18.6
CONTINUOUS FAN OPERATION
When the thermostat continuous fan (G) switch is on without a call for heat or cooling, the indoor fan is
immediately energized up to 50% of the cooling speed. The fan remains energized as long as the call for fan
remains without a call for heat or cooling. This feature allows continuous circulation of air between calls for
heating or cooling.
If a call for heat (W) occurs during continuous fan, the blower will remain energized, the call for heat overides
the call for fan.
If a call for cool (Y) occurs simultaneously with the call for fan (G), the call for cool overrides the call for fan.
See Air Flow Data table.
W415-2306 / C / 09.22.20
H22.5
H22.3.2A
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