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 196 of 288

TM 9-2540-207-14&P

6-32

6.5.40 F4 - VENT AIR OVERHEAT (Design Iteration 3 Only)

THE VENT AIR OUTLET TEMPERATURE HAS EXCEEDED A SAFE OPERATING TEMPERATURE

OF 345°F (174°C)

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

CHECK TO SEE IF FAULT OCCURS

AT START UP

IF FAULT OCCURS AT START UP GO TO STEP

7

2

CHECK THAT ALL DAMPERS IN

VEHICLE ARE OPEN

OPEN ALL DAMPERS FULLY

SWITCH HEATER TO LOW MODE

3

CHECK FOR OBSTRUCTIONS IN

FRONT OF HEATER VENTILATION

OUTLET

REMOVE OBSTRUCTIONS

SWITCH HEATER TO LOW MODE

4

CHECK ALL DUCTING

CONNECTIONS

VEHICLE TM

2.2

2.3

2.7

INSTALL PROPER DUCTING CORRECTLY

SWITCH HEATER TO LOW MODE

5

HEATER DID NOT PROPERLY

PURGE

2.5

3.5

CHECK ALL ELECTRICAL CONNECTIONS AND

PURGE HEATER 3 TIMES.

RESTART HEATER

6

DEFECTIVE VENT SENSOR

REPLACE VENT SENSOR RING

RESTART HEATER

7

DEFECTIVE LOGIC BOARD

REPLACE LOGIC BOARD

RESTART HEATER

8

DEFECTIVE HEAT EXCHANGER

5.4.1

REPLACE HEAT EXCHANGER

RESTART HEATER