TM-9-2540-207-14-P
HEATER, VEHICULAR COMPARTMENT, MODEL: A20
TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2007
TM-9-2540-207-14-P - Page 171 of 288
TM 9-2540-207-14&P
6-7
6.5.5
C3 - VENT FAN FAULT (Design Iteration 1 & 2 Only)
VENT IMPELLER SPEED IS BELOW NORMAL LIMITS
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
WITH HEATER OFF, CHECK FOR FREE
ROTATION OF THE VENT IMPELLER BY
SPINNING BY HAND
5.2.6
5.2.4
IF VENT IMPELLER DOES NOT ROTATE FREELY, AND
AMBIENT TEMPERATURE IS GREATER THAN 32°F (0°C),
REPLACE VENT FAN MOTOR AND IMPELLER
RESTART HEATER
IF THE AMBIENT TEMPERATURE IS BELOW 32°F (0°C),
CHECK FOR AND REMOVE FROST OR OTHER
OBSTRUCTIONS AROUND THE VENT IMPELLER
RESTART HEATER
2
CHECK WIRE CONNECTOR FROM THE
VENT FAN MOTOR TO THE
ELECTRONIC VENT FAN DRIVER
BOARD
5.2.5
RECONNECT
TO THE ELECTRONIC VENT FAN DRIVER
BOARD
RESTART HEATER
3
CHECK WIRE CONNECTOR FROM THE
ELECTRONIC VENT FAN DRIVER
BOARD TO WIRING HARNESS
5.2.5
5.5.6
RECONNECT TO WIRING HARNESS
RESTART HEATER
4
CHECK ALL WIRING CONNECTIONS TO
ELECTRONIC BOARDS INCLUDING THE
TWO CONTROLLER BOARDS (2
CONNECTORS)
5.2.5
RECONNECT ALL WIRING TO CORRECT ELECTRONIC
BOARDS OR COMPONENTS
RESTART HEATER
5
DEFECTIVE ELECTRONIC VENT FAN
DRIVER BOARD
5.2.5
REPLACE ELECTRONIC VENT FAN DRIVER BOARD
RESTART HEATER
6
DEFECTIVE VENT FAN MOTOR
5.2.6
REPLACE VENT FAN MOTOR
RESTART HEATER
7
DEFECTIVE WIRING HARNESS
5.5.6
REPLACE WIRING HARNESS
RESTART HEATER
6.5.6
C3 – VENT FAN FAULT (Design Iteration 3 Only)
VENT IMPELLER SPEED IS BELOW NORMAL LIMITS
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
LOOSE CONNECTIONS ON THE VENT
FAN BOARD
5.2.6
5.2.4
CHECK
AND RECONNECT CONNECTORS J11, J10,
AND J13 ON THE VENT FAN BOARD
RESTART HEATER
2
WITH HEATER OFF, CHECK FOR
FREE ROTATION OF THE VENT
IMPELLOR BY SPINNING BY
HAND
5.2.6
5.2.4
CHECK FOR OBSTRUCTIONS IF VENT IMPELLOR DOES
NOT ROTATE FREELY, AND AMBIENT TEMPERATURE
IS GREATER THAN 32°F (0°C), REPLACE VENT FAN
MOTOR AND IMPELLOR RESTART HEATER IF THE
AMBIENT TEMPERATURE IS BELOW 32°F (0°C),
CHECK FOR AND REMOVE FROST OR OTHER
SUBSTANCES AROUND THE VENT IMPELLOR RESTART
HEATER.
3
VENT FAN GROUND WIRE
IMPROPERLY CONNECTED
5.2.5
RECONNECT
TO THE GROUND WIRE TO THE
BURNER HOUSING BOLT RESTART HEATER
4
DEFECTIVE VENT FAN BOARD
5.2.5
5.5.6
REPLACE VENT FAN BOARD RESTART HEATER
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