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If Cool to Dehumidify is disabled, you will get the following operation
5) Congratulations, you have now set-up the system for dehumidification.
Furnace Dehumidification with Tapped ECM Motors
Dehumidification on these furnaces is enabled by dropping the blower motor speed from
COOL to HEAT for a maximum of 10 minutes before reverting back to COOL speed. If
there is still a demand for dehumidification after 20 minutes, the blower motor will revert
back to HEAT speed. This alternating 10 minute cycle will continue as long as there is a
call for cooling and dehumidification. If Cool to dehumidify is being engaged, the blower
continues to alternate until thermostat humidity is s
atisfied or the “over cool” setpoint is
reached. When the “call for cooling” is satisfied and there is still a demand for
dehumidification, the cooling blower
–off delay is decreased to 5 sec.
On two-stage outdoor units, dehumidification is not active during low stage cooling.
Low stage cooling speed is also the HEAT speed and the high stage Dehum speed.
NOTE:
It is important that the installer set the proper airflow. Some speed taps now
serve dual purposes and the airflow must be adequate for both purposes. The HEAT
speed tap is also used for dehumidification speed and low stage cooling. Therefore; this
tap must be within the heating rise range and adequate for low stage cooling and high
stage dehumidification (315 CFM/Ton).
Summary of Contents for TP-WEM01
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