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 TM 55-1905-219-14-8
4-33. GAGE BOARD - AIR CONDITIONING - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENTS (Cont)
7. Low pres-
a. Turn differential adjustment clockwise to maximum
sure con-
position and range screw counterclockwise to low
trol
limit.
switch
b. Start compressor and control suction pressure by
throttling the compressor suction stop valve.
c. Lower suction pressure to about 10 psi (69 kPa)
below cut-in point. Turn range screw clockwise
until contacts open, stopping compressor. Allow
suction pressure to rise to cut-in point and close
suction valve to hold it there. Turn range screw
counterclockwise until contacts close, starting
compressor.
d. Lower suction pressure to cut-out point and turn
differential screw counterclockwise until contacts
open, stopping compressor. This fixes the cut-out
point.
e. Control suction pressure and check switch settings
and operation.
f. Recommended settings:
Close - 37 psig (255.1 kPa)
Open - 28 psig (193.1 kPa)
4-940
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