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6. Continuous fan input (G) has lowest priority.
a. Refer to the air flow table for your specific model
furnace
b. If a cooling or heat pump condensing unit is
being used in conjunction with this furnace, DIP
switches
7. S1-1, S1-2, S1-3 are used to select the proper
cooling speeds to match the outdoor unit size.
Typical CFM requirements are 400 CFM / Ton.
c. Heating speeds are selected DIP switches S1-4
& S2-1.
1. Turn OFF power to the furnace.
2. Select the cooling blower speeds that match the
installation requirements from the airflow table in
this manual or the Service Manual, If factory cooling
speeds do not match the installation requirements,
the dip switch settings must be changed from factory
position.
3. Turn ON power to furnace.
4. Verify proper temperature rise in heat mode and CFM
in cooling mode.
Blower Heat Off Delay Timings
The integrated control module provides a selectable heat
off delay function. The heat off delay period may be set to
90, 120, 150, 180 seconds using the DIP switches provided
on the control module. The delay is factory shipped at
150 seconds but may be changed to suit the installation
requirements and/or homeowner preference. Refer to the
following figures for switch positions and corresponding
delay times.
PCBBF139 CONTROL BOARD
1
2
3
4
90
OFF OFF
120
OFF ON
150
ON OFF
180
ON ON
*Factory Setting
S3
PURPOSE
Heating Fan
Off Delay
DIP SWITCH
SWITCH
GROUP FUNCTION
DIP Switch Settings
PCBBF139 CONTROL BOARD DIP SWITCHES
S1
1
2
3
4
Cooling
CFM
Switches
Heating Fan
Off Delay
S3
S2
1
2
3
4
1
2
3
4
Heating
CFM
Switches
Continuous
Fan CFM
Switches
Thermostat
Selection
Switches
1
2
3
4
2 Stage Stat
OFF
OFF
1 Stg Stat 10 min delay
ON
OFF
1 Stg Stat 20 min delay
ON
ON
Auto
OFF*
ON*
90
OFF
OFF
120
OFF
ON
150
ON*
OFF*
180
ON
ON
* FACTORY
SETTING
Dip Switch
Switch
Group
Function
S3
S3
Heating Fan
Off Delay
Purpose
Thermostat
Setup