Supply Air Adjustments (Ecm Variable Speed Motors); Installation Of Accessories; Table 2: Supply Air Adjustments, Ecm Variable Speed Motors, Heating Mode; Table 3: Supply Air Adjustments, Ecm Variable Speed Motors, Air Conditioning Mode - Bryant OBM098 Installation Instructions Manual

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
OFF OFF
ON OFF
OFF ON
ON ON
Table 3: Supply air adjustments, ECM variable speed
motors, air conditioning mode
SW2 – COOL
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON

Table 4: 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
Input
USGPH
POSITION
A 0.70
B 0.60
C 0.50
D ALL
Output
Tons
POSITION
A 3.0
B 2.5
C 2.0
D 1.5
CFM HTG. CFM A/C
% increase % increase
or decrease or decrease
0% 0%
+10% +10%
-10% -10%
N/A 0%

Table 5: Delay adjustments - heating mode

SW4 – Delay
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON

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.
10
Input
USGPH
POSITION
A 0.70
B 0.60
C 0.50
D ALL