Supply Air Adjustments (Ecm Variable Speed Motors); 2.12 Installation Of Accessories; Figure 5: Supply Air Adjustments, Start/Stop Delays, Board; Table 2: Supply Air Adjustments, A/C Mode, 4 Speed Motor - CAC / BDP OBL112 Installation Instructions Manual

Table 2: Supply air adjustments, A/C mode, 4 speed
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.

Figure 5: Supply air adjustments, start/stop delays, board

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, the airflow CFM table 8
and the wiring diagram (Figure 8) in this manual for the proper
settings:

Table 3: Supply air adjustments, heating mode, variable

speed motor (ECM)
SW1 – HEAT
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON
* Alternate adjustment for a higher air temperature rise.

Table 4: Supply air adjustments, air conditioning mode,

variable speed motor (ECM)
SW2 – COOL
DIP Switch Positions
1 2
OFF OFF
ON OFF
OFF ON
ON ON
motor
RECOMMENDED
BLOWER SPEED
MED-LOW
MED-HIGH
HIGH
#1158
Input
USGPH
POSITION
A 0.68
B 0.80
C* 0.68
D* 0.80
Output
Tons
POSITION
A 4.0
B 3.5
C 3.0
D 2.5
Table 5: Supply air adjustments, all modes, variable
speed motor (ECM)
SW3 – ADJ (Adjustment)
DIP Switch Positions
1 2 POSITION
OFF OFF A
ON OFF B
OFF ON C
ON ON D
Table 6: Delay adjustments, heating mode, variable
speed motor (ECM)
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 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 or one of the 120
VAC terminals on the ECM can be used to provide a
constant supply of 120 VAC.
Also refer to the instructions supplied with the accessory.
8
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