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 33 of 288
TM 9-2540-207-14&P
3-1
3 OPERATING INSTRUCTIONS
3.1 Approved Control Boxes
The heater is compatible with the vehicle control boxes identified in Table 3-1.
Note: See appropriate Vehicle TM for proper Control Box configuration
.
Control Boxes:
11669705 (NSN: 2590-01-125-6154)
12268109 (NSN: 2490-01-083-5417)
12330264 (NSN: 2540-01-158-0837)
Panel Assembly:
12345539 (NSN: 6110-01-266-4006)
Test Stand:
VHTS-89102 (NSN: 4910-01-318-4508)
(for non-Depot level calibration)
Hunter Model 6500
(for Depot level calibration)
3.1-1.
Approved Control Boxes
3.2
Starting the heater
1.
The START/OFF/RUN switch on the control box should initially be in the OFF position.
2.
The HI/LO switch on the Control Box may be in either position during start up.(If the
switch is in the HI position, the heater will start and enter High Heat mode. If the switch
is in the LO position, the heater will start and enter Low Heat mode.)
3.
To
start the heater, move the START/OFF/RUN switch momentarily to START for at
least four (4) seconds or until indicator light comes on, then move switch directly to RUN.
The heater will now run automatically and does not require any further actions by the
operator.
3.3
Starting Systems Procedures
1.
The heater will start the Vent and Burner Fans.
After checking for vent overheat condition, if
none is found, the heater displays 01 on the Diagnostic Display.
For the next 20 seconds,
the heater will perform a number of diagnostic checks on both the Vent and Burner Fans
and certain other components for possible failure.
2.
The heater then enters Stage 02.
The Ignitor will turn on and requires approximately 50
seconds to heat fully.
During this delay the heater will check the condition of the ignitor,
perform a diagnostic check of the segments and control circuit of the Diagnostic Display,
check for reverse air flow, combustion air inlet over pressure, and low voltage conditions.
3.
During the check of the Diagnostic Display it will go through a series of steps in the
sequence shown in Table 3-2., each step consisting of two digits or two letters.
A delay
separates one check segment from the next.
Observation of this check will confirm that the
Diagnostic Display is operating correctly.
Should the segments not appear as illustrated in
Table 3-2, refer to Section 5.9.2.
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