Fan Motor - A.O. Smith T-D2-OS Service Manual

10-3. Fan motor

Unit Part #
Function
Failure events
Effects on the water
heater if fan motor fails
Error codes when the fan
motor fails
Diagnostic
Color/Number of wires
T-D2-IN
PWN turbo fan motor
T-D2-OS
PWN multi blade fan motor
#103 Takagi 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. Visual 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 TM-RE30 temperature remote controller. See Section
12-1 for details.
T-D2-IN / T-D2-OS Service Manual
EKK25 (T-D2-IN)
EKK54 (T-D2-OS)
121
19
CONFIDENTIAL
Ver. 1.00
Checkpoint
611 991
Fan damper (#115 / TU001)
The fan damper
is not included in
EKK25.
G