TM 5-4520-241-14
b. Repair. Forward the fuel pump power supply to direct support maintenance for repairs.
c. Installation. Install in the reverse order of removal, and note the following.
(1) The positive (+) output of the power supply is through the yellow wire, which must be connected to the three-
way electrical connector for the carburetor solenoid valve and the EXTERNAL FUEL PUMP RECEPTACLE.
(2) The negative (-) output of the power supply is through the power supply case. Be sure that attaching screws
are tightened securely so that there is good electrical contact between the fuel pump power supply bracket and the heater
case.
SECTION XI. MAINTENANCE OF BURNER ASSEMBLY
4-39.
DESCRIPTION.
a. Burner Assembly. The burner assembly is the housing where the air and fuel mixture is ignited. No maintenance
is authorized at the organizational level.
b. Ignition Transformer and Cable. The ignition transformer steps up 120 VAC line current to 5,000 VAC to provide
a spark at the burner head. This spark is delivered by the igniter which is connected by the cable to the ignition
transformer.
c. Igniter. The igniter consists of an electrode insulated from an outer sleeve. The spark jumps from the electrode
to the sleeve.
4-40.
IGNITION TRANSFORMER AND CABLE.
a. Disassembly.
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be sure to disconnect the power plug before repairing the heater.
(1) Unplug the power supply cord from the power receptacle.
(2) Open the front access door, the left and right access doors, and remove the two louvered side panels.
(3) Remove four nuts (1, fig. 4-30), lock washers (2), and washers (3) to remove ignition transformer (4) from
bulkhead (5).
(4) Disconnect the brown lead (6) from the terminal board and the white lead (7) from the connector.
4-76
