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 195 of 288
TM 9-2540-207-14&P
6-31
6.5.38 F3 - HEAT LIMIT (Design Iteration 3 Only)
VENT AIR OUTLET TEMPERATURE HAS EXCEEDED THE TARGET TEMPERATURE
AND HEAT
OUTPUT WILL BE REDUCED.
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
CHECK THAT ALL DAMPERS IN
VEHICLE ARE OPEN
OPEN ALL DAMPERS FULLY
SWITCH HEATER TO LOW MODE
2
CHECK FOR OBSTRUCTIONS IN
FRONT OF HEATER VENTILATION
OUTLET
REMOVE OBSTRUCTIONS
SWITCH HEATER TO LOW MODE
3
CHECK ALL DUCTING
CONNECTIONS
VEHICLE TM
2.2
2.3
2.7
INSTALL DUCTING CORRECTLY
SWITCH HEATER TO LOW MODE
NOTE:THIS IS A WARNING ONLY, IT PRECEDES A F4 FAULT.
6.5.39 F4 - VENT AIR OVERHEAT (Design Iteration 1 & 2 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
DEFECTIVE HEAT EXCHANGER
5.4.1
REPLACE HEAT EXCHANGER
RESTART HEATER
6
HEATER DID NOT PROPERLY
PURGE
2.5
3.5
CHECK ALL ELECTRICAL CONNECTIONS AND
PURGE HEATER 3 TIMES.
RESTART HEATER
7
DEFECTIVE ELECTRONIC
PROGRAMMED CONTROLLER
BOARD
5.2.5
REPLACE ELECTRONIC PROGRAMMED
CONTROLLER
RESTART HEATER
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