Whirlpool WMB, Installation Instructions Manual

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To change blower speed: Refer to “Wiring Diagram—
Blower (PCS Motor)” and “Wiring Diagram—Optional
Electric Heat.”
1. Disconnect all power supplies.
2. Remove the air handler access panel.
3. Locate pin number 2 on the blower relay. Two black wires are
connected to this terminal pin. One connects to pin number
5 on the blower relay, one connects to either a red, blue or
black wire from terminal 1 (T1).
4. Remove the wire going to the 4-pin blower motor connector
from the splice.
5. Connect the blower lead (Red [LO], Blue [MED] or Black [HI])
for the correct blower speed onto the splice from the 4-pin
blower motor connector.
NOTE: Unused blower speeds are shipped from the factory
covered with a plastic cap. Remove this cap from the new
blower speed terminal and replace it over the factory-set
blower terminal.
6. Replace all panels.
7. Reconnect power.
Check Airflow (Variable Speed Motor)
For proper cooling operation, the airflow through the indoor coil
should be between 350 and 450 CFM per ton of cooling capacity
(or 350 - 450 CFM per 12,000 Btu/h) based on the rating of the
outdoor condensing unit.
IMPORTANT: The cooling blower speed must be set to provide a
minimum of 350 CFM airflow per ton (12,000 Btu/h) of outdoor
cooling capacity.
To change blower speed: Refer to “Wiring Diagram—
Blower (Variable Speed Motor).”
1. Disconnect all power supplies.
2. Locate the control board in the blower control box.
3. Set the HEAT and COOL taps by moving the board jumpers
to the A, B, C, or D positions (see Control Board Taps and
Dehumidify Resistor) based on the information found in the
Blower Performance Chart—Variable Speed Motor.
NOTE: If using a humidistat, the dehumidify resistor located
on the bottom right of the control board must be removed to
enable it. See Control Board Taps and Dehumidify Resistor.
The HUM terminal on the board must be connected to the
Normally Closed contact of the humidistat so that the board
senses an open circuit on high humidity. If a humidistat is
used, the dehumidify LED (see D1 below) will light when the
humidistat opens and the motor runs at reduced airflow.
Control Board Taps and Dehumidify Resistor
.
4. If desired, adjust ADJUST tap from NORM: (+) will increase
airflow by 10% or (-) will decrease airflow by 12%
5. Reconnect all power supplies.
Blower Performance Chart—PSC Motor
Air
Handler
Model
Blower
Speed
CFM @ ESP. - in W.C.
0.1 0.2 0.3 0.4 0.5 0.6
WMB24
CC-1A Low 583 563 557 541 522 473
Medium 862 855 834 794 748 677
High 1,159 1,096 1,029 957 871 794
WMB36
CC-1A Low 838 827 808 778 746 699
Medium 1,265 1,255 1,235 1,215 1,173 1,118
High 1,358 1,340 1,311 1,282 1,231 1,179
WMB48
CC-1A Low 1,161 1,153 1,138 1,115 1,091 1,050
Medium 1,569 1,541 1,507 1,460 1,405 1,341
High 1,769 1,735 1,703 1,626 1,570 1,489
WMB60
CC-1A Low 1,632 1,566 1,581 1,544 1,482 1,417
Medium 2,163 2,103 2,058 2,000 1,947 1,855
High 2,398 2,394 2,266 2,180 2,109 2,042
WARNING
Electrical Shock Hazard
Disconnect all power supplies before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
A. Dehumidify LED
B. Dehumidify resistor
WARNING
Electrical Shock Hazard
Disconnect all power supplies before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
DEHUMIDIFY
CUT TO ENABLE
COOL HEAT ADJUST
NORM A
B
C
D
A
B
C
D
(+)
(–)
TEST
D1
A
B