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Figure 5:Blower "OFF" delay - Board #ST9103A
Figure 6:Blower start / stop delays - Board #1158
2.11
SUPPLY AIR ADJUSTMENT (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:
Table 3:Heating Mode
SW1 – HEAT
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Table 4: Air Conditioning Mode
SW2 – COOL
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Table 5:CFM adjustment - All Modes
SW3 – ADJ (Adjustment)
DIP Switch Positions
1
2
POSITION
OFF
OFF
A
ON
OFF
B
OFF
ON
C
ON
ON
D
Input
USGPH
POSITION
A
0.90
B
1.10
C*
N / A
D*
N / A
Output
Tons
POSITION
A
5.0
B
4.0
C
3.5
D
3.0
CFM HTG.
CFM A/C
% increase
% increase
or decrease
or decrease
0%
0%
+10%
+10%
-10%
-10%
N/A
0%
Table 6:Delay adjustments - Heating Mode
SW4 – Delay
DIP Switch Positions
1
2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
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.
H
(HUM)
2.12.1
UMIDIFIER
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.
E
2.12.2
LECTRONIC AIR
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
Input
USGPH
POSITION
A
0.90
B
1.10
C
1.10
*
N / A
D
C
(EAC)
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