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 TM 55-1905-219-14-8
4-33. GAGE BOARD - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENTS
6. High
a. Turn differential screw to minimum (counterclock-
pressure
wise) and range screw to high limit (clockwise).
control
switch
b. Start compressor and control discharge pressure by
throttling condenser water flow.
c. Raise discharge pressure to about 10 psi (69 kPa)
above cut-in point. Turn range screw counterclock-
wise until contacts open, stopping compressor. When
discharge pressure drops to cut-in point, turn range
screw slowly clockwise until contacts close, start-
ing compressor. The cut-in point is now set.
d. With the compressor running, turn differential screw
(clockwise) to wide limit. Raise discharge pressure
to cut-out point and turn differential screw coun-
terclockwise until contacts open, stopping compres-
sor. The cut-out point is now set.
e. Control discharge pressure and check switch settings
and operation.
f. Recommended settings:
Close - 125 psig (861.9 kPa)
Open - 175 psig (1206.6 kPa)
4-938
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