TM 9-4110-254-14
2-6.
OPERATOR CHECKS.
(See fig. 2-4.)
NOTE
All checks must be performed when the DEFROST IN PROGRESS indicator is off.
a. Check the thermometer (REFRIGERATION TEMPERATURE) (5) periodically to be sure it is within 15F (70 C)
of the temperature set on the remote bulb thermostat (TEMPERATURE CONTROL) (2).
b. Check the pressure gage (DISCHARGE PRESSURE) (6) periodically to be sure it is between 160 and 270 psi
(1104 and 1863 kPa).
c. Check the compound gage (SUCTION PRESSURE) (7) periodically to be sure it is between 0 and 15 psi (0 and
104 kPa).
NOTE
An occasional flash of bubbles in the sight indicator (SIGHT GLASS) port is
normal. The sight indicator can be viewed looking through the side condenser
door.
d. Check the sight indicator (SIGHT GLASS) (8) port to be sure it is clear. The center indicator should be green or
chartreuse in color.
NOTE
Occasional bubbles in the compressor sight glass oil is normal. The sight glass
can be viewed looking through the front top panel.
e. Check the compressor sight glass (9) port to be sure the oil is clear and the level Is between 1/4 and 1/2 up the
port.
2-7.
SHUTDOWN PROCEDURES.
(See fig. 2-4.)
NOTE
If the refrigeration unit is to be left off for several days, it must be pumped down
Notify Unit Maintenance.
a. Place the toggle switch (START/RUN, OFF) (4) handle in the OFF position.
b. Place the circuit breaker handle (3) in the OFF position.
c.
Notify unit maintenance if the refrigeration unit is to be put into administrative storage for several days.
2-8.
DECALS AND INSTRUCTION PLATES.
Decals and instruction plates are illustrated in the following figure.
2-19
