h. Thermostat Switch.
ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
(1)
(2)
(3)
(4)
5-10
Removal.
(a) Refer to paragraph 3-27 and drain the generator radiator.
(b) Tag and disconnect electrical leads to thermostat (37, Figure 5-1).
(c) Remove thermostat switch.
Cleaning and Inspection.
(a) Clean thermostat switch with an approved solvent and dry thoroughly with filterd compressed
air.
(b) Visually inspect switch for cracks, corrosion, stripped or damaged threads, and evidence of
shorting or other damage.
Testing.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Suspend thermostat switch in a container of clean water so that its temperature sensor is com-
pletely immersed in water, but not touching the bottom or sides of the container.
Suspend a reliable thermometer in the water so that its temperature sensing end is under water
but not touching the sides or bottom of the container.
Connect an ohmmeter across the terminals of the thermostat switch.
Gradually heat the water stirring constantly to evenly distribute the heat.
Observe both the ohmmeter and thermometer. The ohmmeter should indicate continuity up to a
temperature of 155 ± 5° F (68.4 ± 2.8°C). Above this temperature, the ohmmeter should indicate
an open circuit.
Remove the heat and allow the water to cool.
Ohmmeter should indicate continuity at a temperature of +135 ± 5°F (+56.2 ± 2.8° C).
Replace thermostat switch if it is damaged or fails to operate properly.
Installation.
(a) Install thermostat switch (37, Figure 5-1).
(b) Connect electrical leads to thermostat.
(c) Refer to paragraph 3-27 and fill the generator set radiator.
