Fan Motor - A.O. Smith T-M32 Service Manual

10-3. Fan motor

Unit Part #
Function
Failure event
Effects on the water
heater if fan motor fails
Error codes when the fan
motor fails
Diagnostic
Color / Number of wires
PWN turbo fan motor
#115 AOS Part #
To provide combustion air into the combustion chamber and to exhaust
flue gas.
1. Fan speed failure, causing abnormal sounds with or without combustion
during operation.
2. Unexpected activation caused by the connectors of the fan motor getting
wet.
3. Disconnects from the bottom of the combustion chamber.
1. The water heater does not function properly
2. Failure to ignite or abnormal ignition
3. Unstable combustion conditions
101 111
1. V isual inspection: connection / breakage of wires or dust (causing
electrical shortage)
2. Voltage check: proper range of voltages shown below.
Red-Blue 110 to 160 VDC (Input)
Yellow-Blue 13 to 17 VDC (Input)
Orange-Blue 2.0 to 6.5 VDC (Input)
Verify the fan motor speed using the Diagnostics Mode of
White-Blue
the temperature remote controller. See Section 12-1 for
details.
O p e n i n g 2 - 1 / 8 " ( 5 4 m m )
The fan damper
is not included in
EKK25.
T-M32 / T-M32 ASME Service Manual
EKK25
121
3 - 3 / 4 " ( 9 5 . 1 5 m m )
Fan damper (#116 / EM381)
17
CONFIDENTIAL
Ver. 1.03
Checkpoint
611 991
4 6
G