Instruction manual

ManualsBrandsBryant ManualsDomestic Appliancesstart--up operating and service and

thermostat, momentarily turn off the FAN switch or push

button on the room thermostat for 1--3 seconds after the

blower motor BLWM is operating. The furnace control

CPU will shift the continuous--blower airflow from the

factory setting to the next highest CF selection airflow as

shown in Fig. 55. Momentarily turning off the FAN switch

again at the thermostat will shift the continuous--blower

airflow up one more increment. If you repeat this procedure

enough you will eventually shift the continuous--blower

airflow to the lowest CF selection as shown in Fig. 55. The

selection can be changed as many times as desired and is

stored in the memory to be automatically used following a

power interruption.

NOTE: If the blower--off delay is set to the maximum, the

adjustable continuous--fan feature is locked (i.e., fan speed cannot

be changed from its current setting).

6. Heat pump

See Fig. 35 and 36 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

cooling airflow, low--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 heating

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 low--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.

7. Component self--test

The furnace features a component test system to help

diagnose 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. 35.) Refer to Page 70 for instructions.

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