Heat Pump; Component Self-Test - International comfort products F96VTN Installation Instructions Manual

the furnace control CPU will drop the blower motor BLWM
to low- -heat airflow during the selected blower- -OFF delay
period before transitioning to continuous- -blower airflow.
When the thermostat "calls for low- -cooling", the blower
motor BLWM will switch to operate at low- -cooling airflow.
When the thermostat is satisfied, the blower motor BLWM
will operate an additional 90 seconds at low- -cooling air-
flow before transitioning back to continuous- -blower air-
flow.
When the thermostat "calls for high- -cooling", the blower
motor BLWM will operate at high cooling airflow. When
the thermostat is satisfied, the blower motor BLWM will op-
erate an additional 90 seconds at high- -cooling airflow be-
fore transitioning back to continuous- -blower airflow. When
the R- -to- -G circuit is opened, the blower motor BLWM will
continue operating for an additional 5 seconds, if no other
function requires blower motor BLWM operation.

6. Heat pump

See Fig. 39 and 40 for thermostat connections.
When installed with a heat pump, the furnace control auto-
matically 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
80
cooling airflow or low- -heat airflow whichever is lowest.
The blower motor BLWM will remain on until the main
burners ignite then shut OFF and remain OFF for 25 sec-
onds before coming back on at heating airflow. When the
W/W1 input signal disappears, the furnace control begins a
normal inducer post- -purge period while changing the blow-
er airflow. If Y/Y2 input is still energized the furnace con-
trol 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 transi-
tion 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 low- -heat air-
flow 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 blow-
er motor BLWM will operate at continuous blower airflow.
7. Component self- -test
The furnace features a component test system to help diag-
nose a system problem in the case of a component failure.
To initiate the component test procedure, ensure that there
are no thermostat inputs to the control and all time delays
have expired. Turn on setup switch SW1- -6. See Fig. 39.)
Refer to Page 71 for instructions.
Specifications subject to change without notice.
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