TM 5-4520-240-14
CHAPTER 10
REPAIR OF BLOWER ASSEMBLY
10-1. Description.
The blower assembly consists of a 28 volt motor and
two impeller assemblies. The dual combustion air im-
pellers, located at the rear of the motor, provide air
under slight pressure for combustion only. Combustion
air is ducted through the combustion air hose to the
burner head. Ventilation air is circulated around the
outside of the heat exchanger by the ventilation air
fan. This heated air passes through the warm air louver
to heat the enclosure.
10-2. Removal and Disassembly.
WARNING
T h e ignition system of this space
heater contains dangerous voltages
w h i c h can cause severe electrical
shock. Be sure to disconnect the power
plug before repairing the heater.
a. Disconnect the power and thermostat plugs. Dis-
connect the fuel supply and the exhaust piping.
Remove the top and side cover panels and warm air
louver.
b. Disconnect the fuel preheat thermostat leads and
the fuel solenoid leads. Disconnect the compression nut
(1, fig. 10-1) of fuel tube (2) at the elbow (4) in the car-
buretor inlet. Disconnect the overflow tube (5) from the
elbow (10) on the top of the carburetor (9). Remove the
Figure 10-1. Carburetor installation exploded view
overflow tube and tube (6).
c. Remove the four screws (7) and lock washers (8)
d. Loosen the hose clamps (1, fig. 10-2) and remove
securing the carburetor to the burner head and remove
the combustion air hose (2) from the blower outlet and
the carburetor.
the burner head inlet.
10-1
