TM 5-4520-253-13
l N S P E C T / T E S T / R E M O V E / l N S T A L L S A F E T Y T H E R M O S T A T S A N D F L A ME
SWITCH AND BRACKET ASSEMBLY (CONT)
INSTALLATION:
1. Install lower overheat thermostat as follows:
a. Install thermostat (4) on mounting bracket
(3) using two screws (9), lock washers (10),
and nuts (11). Use one screw/lock washer/
nut combination to install shield (5) as
illustrated.
b. Connect wires (6 and 7) to thermostat (4)
using quick disconnect terminals (8).
c. Install thermostat (4) through mounting
hole and secure thermostat mounting
bracket (3) using two screws (1) and lock
washers (2).
2. Install upper overheat thermostat and flame switch and bracket assembly as follows:
a.
b.
c.
d.
e.
Install thermostat (8) on flame switch and bracket assembly (3) using two screws (9), lock
washers (10), and nuts (11).
If wires have been removed from flame switch and bracket assembly, reinsert wires through
opening in assembly.
Connect red and violet wires to flame switch (12),
switch (13), and connect yellow and grey wires (6
using quick disconnect terminals (5).
Press grommet (14) in place.
connect red and brown wires to flame
and 7) to upper overheat thermostat (8)
Install flame switch and bracket assembly (3) in opening (4) in heater bulkhead, Attach
assembly to heater bulkhead using two screws (1) and lock washers (2). With screws loosened,
adjust flame switch and bracket assembly downward as far as it will go. This seats the flame
switches (12 and 13) against the heat exchanger. Tighten screws (1).
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