23
W2
W1
O
Y/Y2
G
R
C
1=COM
2=CAP
3=CAP
4=HIGH
5=MED
6=LOW
3 SPD. MOTOR
1
2
3
5
6
4
TRANSFORMER
POWER SUPPLY
24V
BROWN
BLACK
RED
WHITE
BLACK
WHITE
FUSE
BLOWER
MOTOR PLUG
6
5
4
3
2
1
1 = COM
2 = CAP
3 = CAP
4 = HIGH
5 = MED
6 = LOW
CUT WIRES TO REMOVE
PLUG HOUSING WHEN
HEATER KIT IS NOT
INSTALLED
L2 COM 2
L2
L2 COM
L1
VS PO
WER
XFMR
COOL
HEA
T
24 V
A
C
RED
COM
GREY
P3
HEATER KIT
PLUG
Y1
¢7105381¤
710538A
Air Handler
NOTES:
1. T h e b l o w e r m o t o r
speed tap connection
may not be as shown.
See the Installation
Instructions.
2. Disconnect all power
before servicing.
3. Transformer may have
a dual voltage primary
tap. Match the tap
p o s i t i o n w i t h t h e
supply voltage used.
4. If the internal wiring
is replaced, use only
105°C copper wire of
the same gauge.
WIRING DIAGRAM
710538A
Legend
Field Wiring
Factory
Wiring
Low Voltage
High Voltage
Figure 12. Wiring Diagram for MB6BM Series Indoor Blower