TM 9-4110-255-14
2-6. OPERATOR CHECKS.
See figure 2-4.
a. Perform all your "DURING" PMCS functions (table 2-1).
b. Check the AMMETER (8) periodically to be sure it is indicating a positive (+) number.
NOTE
All checks must be performed when the DEFROST IN PROGRESS lamp is off.
c. Check the thermometer (REFRIGERATION TEMPERATURE) (9) periodically to be sure it is within 15F (8C)
of the temperature set on the remote bulb thermostat (TEMPERATURE CONTROL) (4).
d. Check the pressure gage (DISCHARGE PRESSURE) (10) periodically to be sure it is between 165 and 250 psi
(1139 and 1725 kPa).
e. Check the compound gage (SUCTION PRESSURE) (11) periodically to be sure it is between 0 and 15 psi (O 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.
f. Check the sight indicator (SIGHT GLASS) (12) 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.
g. Check the compressor sight glass (13) port to be sure the oil is clear and the level is between 1/4 and 1/2 up the
port.
h. Check the FUEL GAGE (6) periodically to be sure it is indicating a fuel level above 1/4.
2-26
