59MN7C: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
67
change the active continuous fan speed to the next speed (CF2CF3).
Repeating again will set the active continuous fan back to the primary
speed (CFn). This method is intended as a way for home owners to
adjust the continuous fan speed setting from the thermostat depending on
their needs.
Method 2: The active continuous fan speed (CFn, CF2 or CF3) can be
selected via the service tech app.
Heat Pump
See Fig. 38 for thermostat connections. When installed with a heat
pump, the furnace control automatically changes the timing sequence to
avoid long blower off times during demand defrost cycles. Whenever
W/W1 is energized along with Y1 or Y/Y2, the furnace control CPU will
transition to or bring on the blower motor BLWM at cooling airflow,
minimum-heat airflow, or the mid-range airflow, whichever is lowest.
The blower motor BLWM will remain on until the main burners ignite
then shut OFF and remain OFF for 25 seconds before coming back on at
modulating heat airflow. When the W/W1 input signal disappears, the
furnace control begins a normal inducer post-purge period while
changing the blower airflow. If Y/Y2 input is still energized the furnace
control CPU will transition the blower motor BLWM airflow to cooling
airflow. If Y/Y2 input signal disappears and the Y1 input is still
energized the furnace control CPU will transition the blower motor
BLWM to low-cooling airflow. If both the Y1 and Y/Y2 signals
disappear at the same time, the blower motor BLWM will remain on at
minimum-heat airflow for the selected blower-OFF delay period. At the
end of the blower-OFF delay, the blower motor BLWM will shut OFF
unless G is still energized, in which case the blower motor BLWM will
operate at continuous blower airflow.
To Next Page
