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 TM 55-1905-220-14-9
4-67. HOT WATER HEATER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARK
REPAIR (Cont)
12. Calibrate thermostat
as follows:
(a) Set thermostat dial at 140 .
F
(b) Obtain temperature of water in
heater. The difference between
the dial setting and temperature
of the water is the number of
F
the thermostat is "out".
(c) Set dial (12) to temperature noted
on thermometer.
(d) Pull off dial (12) without changing
the setting.
(e) Loosen the two calibration screws
(A).
(f) Hold the cam (B) stationary and
revolve the calibration plate (C)
and adjusting screw (D) clockwise
if the water temperature in the
heater is below the dial setting,
and counterclockwise if the
temperature in the heater is above
the dial setting. The thermostat
will snap when its adjustment is
the same as the water temperature.
Each calibration mark equals 12 .
F
(g) Tighten calibration screws (A)
carefully and replace dial (12).
Rotate the dial (12) up and down.
It should cut in and out at the
same temperature of the water in
the heater.
(h) Move dial to 140and let heater
heat up. It may be necessary to
make a further slight adjustment.
4-1444
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