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BLOWER SPEED ADJUSTMENTS
(A/C MODE, 4 SPEED MOTOR)
A/C CAPACITY
(TONS)
2.5
3.0
4.0
To effect the adjustment, the RED (for heating) and BLUE (for
cooling and heat pump) wires can be changed on the motor.
Also, refer to the position of the wires on the electronic board
of the unit and consult the wiring diagrams. If the heating and
air conditioning speeds are the same, the RED wire must be
moved to "UNUSED LEADS" on the electronic board and the
jumper provided with the BLUE wire must be used between the
"HEAT" and "COOL" terminals.
The blower start/stop delays can be adjusted by positioning the
DIP switches on the electronic board as shown in the following
figures. However, the recommended adjustments are 60
seconds blower ON delay and 2 minutes blower OFF delay.
Blower "OFF" delay
Board # ST9103A
Blower start / stop delays
Board # 1158
2.11 SUPPLY AIR ADJUSTMENTS
(ECM VARIABLE SPEED MOTORS)
On units equipped with ECM variable speed blower motors,
the air supply must be adjusted based on heating/air
conditioning output. The start/stop delays of the blower must
also be adjusted by positioning the DIP switches on the
electronic board. Refer to the following tables and the wiring
diagram in this manual for the proper settings:
HEATING MODE
SW1 – HEAT
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
* Alternate adjustment for a higher air temperature rise.
RECOMMENDED
BLOWER SPEED
MED-LOW
MED-HIGH
HIGH
Input
USGPH
POSITION
A
0.68
B
0.80
C*
0.68
D*
0.80
AIR CONDITIONING MODE
SW2 – COOL
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
CFM ADJUSTMENTS – ALL MODES
SW3 – ADJ (Adjustment)
DIP Switch Positions
1
2
POSITION
OFF
OFF
A
ON
OFF
B
OFF
ON
C
ON
ON
D
DELAY ADJUSTMENTS – HEATING MODE
SW4 – Delay
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
* Alternate adjustments for both input rate (refer to air flow table).
2.12 INSTALLATION OF ACCESSORIES
WARNING
Electrical shock hazard.
Turn OFF electrical power at the fuse box or service
panel before making any electrical connections and
ensure a proper ground connection is made before
connecting line voltage.
Failure to do so can result in death or bodily injury.
2.12.1 Humidifier (HUM)
The 120 VAC HUM terminal on the electronic board of the
blower is tied directly to terminal 8 of the 9-terminal
connector of the electronic board. It supplies 120 VAC
electric power when the burner is in operation.
A 24 VAC signal can also be supplied from the W and C
terminals on the blower electronic board to activate a
switching relay.
Also refer to the instructions supplied with the accessory.
2.12.2 Electronic Air Cleaner (EAC)
The EAC terminal on the electronic board supplies 120
VAC when the blower is operating in the heating or air
conditioning mode. This signal can be used to activate an
electronic air cleaner that is not equipped with an air flow
switch. If the cleaner is equipped with an air flow switch,
the S terminal on the electronic board can be used to
provide a constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
8
Output
Tons
POSITION
A
4.0
B
3.5
C
3.0
D
2.5
CFM HTG.
CFM A/C
% increase
% increase
or decrease
or decrease
0%
0%
+10%
+10%
-10%
-10%
N/A
0%
Input
USGPH
POSITION
A
0.68
B
0.80
C*
ALL
D*
ALL
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