TM 9-4110-256-14
2-6. OPERATOR CHECKS.
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 (7C)
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 165 and 250 psi
(1138.5 and 1725 kPa).
c. Check the compound gage (SUCTION PRESSURE) (7) periodically to be sure it is between 0 and 15 psi (0 and
103.5 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 bottom 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.
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. When the refrigeration unit stops running, 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.
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