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Wiring Diagram—Blower (Variable Speed Motor)
1
COM
208V
240V
Pre-Start Check
Is unit properly located, level, secure, and serviceable?
Is the wiring neat, correct, and in accordance with the wiring
diagram?
Is the air handler properly grounded and connected to a
properly sized fuse or circuit breaker?
Is the thermostat correctly wired, level, and in a good
location?
Are all access panels in place and secure?
Are any accessories properly installed?
6-Pin Plug
2
3
4
5 6
24V
BU
24V
R
TR
240
BWR
18 BK
18 Y
18 G
GND
Complete Installation
Power (Factory Wired)
Control (Factory Wired
Transformer TR
Blower Motor MTR
Ground Connection GND
Blower Relay BWR
Control Board
Hum
18 R
R
18 BU
C1
EM
18 W
W1
O
Y2
Y1
16-Pin
G
Plug & Cap
5-Pin
Plug
16-Pin
Plug & Cap
5
4
MTR
3
2
1
5-Pin Cap
Check Airflow (PSC Motor)
Cooling blower speed—if cooling is used
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.
The cooling blower speed is factory configured to provide
correct airflow for an outdoor condensing unit or heat pump
that matches the maximum cooling capacity rating of the air
handler.
If the outdoor condensing unit is smaller than the maximum
cooling capacity rating for the air handler, the cooling blower
speed may need to be changed. Refer to Blower
Performance Chart—PSC Motor.
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. The heating blower speed must be set
according to the heater installation instructions if installed.
18 R
R
18 BU
C1
18 BK
W2
18 OR
O
18 BU/W
Y2
18 Y
Y1
18 G
G
18 W
W1
7
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