10
Figure 8: Blower start/stop delays
Board # 1158
2.12 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, air flow table 2
and the wiring diagram, figures 10 and 11 in this manual for
the proper settings:
Table 2: Supply air adjustments, ECM variable speed
motors, heating mode
SW1 – HEAT
DIP Switch Positions
1 2
POSITION
Input
USGPH
OFF OFF
A
0.70
ON OFF
B
0.60
OFF ON
C
0.50
ON ON
D
ALL
Table 3: Supply air adjustments, ECM variable speed
motors, air conditioning mode
SW2 – COOL
DIP Switch Positions
1 2
POSITION
Output
Tons
OFF OFF
A
3.0
ON OFF
B
2.5
OFF ON
C
2.0
ON ON
D
1.5
Table 4: CFM adjustments, all modes
SW3 – ADJ (Adjustment)
DIP Switch Positions
1 2
POSITION
CFM HTG.
% increase
or decrease
CFM A/C
% increase
or decrease
OFF OFF
A
0%
0%
ON OFF
B
+10%
+10%
OFF ON
C
-10%
-10%
ON ON
D
N/A
0%
Table 5: Delay adjustments - heating mode
SW4 – Delay
DIP Switch Positions
1 2
POSITION
Input
USGPH
OFF OFF
A
0.70
ON OFF B
0.60
OFF ON
C
0.50
ON ON D
ALL
2.13 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.
2.13.1 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.
2.13.2 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 or one of the 120
VAC terminal on the ECM electronic card can be used to
provide a constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
Summary of Contents for OBM098
Page 18: ...18 Figure 9 Furnace dimensions...
Page 19: ...19 Figure 10 Wiring diagram 4 speed motor PSC...
Page 20: ...20 Figure 11 Wiring diagram variable speed motor ECM...
Page 21: ...21 COMPONENTS AND REPLACEMENT PARTS...
Page 22: ...22 Figure 12 Parts list with 4 speed motor PSC B50064G...
Page 24: ...24 Figure 13 Parts list with variable speed motor ECM B50074H...
Page 44: ...19 Figure 9 Dimensions de la fournaise...
Page 45: ...20 Figure 10 Diagramme lectrique moteur 4 vitesses PSC...
Page 46: ...21 Figure 11 Diagramme lectrique moteur vitesse variable ECM...
Page 47: ...22 COMPOSANTES ET PI CES DE REMPLACEMENT...
Page 48: ...23 B50064G Figure 12 Liste de pi ces avec moteur 4 vitesses PSC...
Page 50: ...25 B50074G Figure 13 Liste de pi ces avec moteur vitesse variable ECM...
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