TM 5-4520-241-14
4-37.
SAFETY THERMOSTATS.
a. Removal.
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) Disconnect the power plug from the power receptacle.
(2) Open either the right or left side access door to gain access to the overheat thermostats.
Remove the
combustion air duct for access to the lower thermostat.
(3) Remove the bracket (1, fig. 4-27) which holds the lower thermostat inside the heat exchanger compartment
by removing screws (2) and lock washers (3).
(4) Pull the bracket out of the heater bulkhead. Pull off safety switch (4) and gasket (5). Remove thermostat (9)
by removing nuts (6), washers (7), and screws (8).
NOTE
Only the overheat thermostat mounted above the burner has a shield.
(5) Remove bracket (11) by removing screws (12) and washers (13). Pull the bracket out of the heater bulkhead.
Remove thermostat (18) by removing nuts (14), washers (15), shield (16), and screws (17).
(6) If either grommet (10 or 19) is cracked or damaged, pry it out with a screwdriver and replace it. Tag and
disconnect the wires to the flame switch (27).
(7) Remove screw (20), lock washer (21), and flat washer (22) to remove the assembled flame switch from the
heater case. Pull the switch out carefully to avoid damage to the flame switch tube.
(8) Remove screws (23), lock washers (24), and washers (25) to remove mounting base (26) from flame switch
(27).
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