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For example, assume the system is an air conditioner
matched with a furnace. With a call for low stage cooling,
the air conditioner will calculate the system’s low stage
cooling airflow demand. The air conditioner will then send
a fan request along with the low stage cooling airflow de-
mand to the furnace. Once received, the furnace will send
the low stage cooling airflow demand to the ECM motor.
The ECM motor then delivers the low stage cooling airflow.
See the applicable ComfortNet air conditioner or heat pump
installation manual for the airflow delivered during cooling
or heat pump heating.
In continuous fan mode, the CTK0*AA thermostat provides
the airflow demand. The thermostat may be configured for
one of threecontinuous fan speed settings allow for 25%, 50%
or 75% airflow, based on the furnaces’ maximum airflow ca-
pability. During continuous fan operation, the thermostat sends
a fan request along with the continuous fan demand to the
furnace. The furnace, in turn, sends the demand to the ECM
motor. The ECM motor delivers the requested continuous fan
airflow.