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TM 55-8145-221-14&P
REFRIGERATED CONTAINER SYSTEM
CONTROLS AND INDICATORS – Continued
0005 00
REFRIGERATION UNIT OPERATING CONTROLS AND INDICATORS (Figure 8).
The controls and indicators needed to operate and monitor the refrigeration unit are located on the control box assembly and
inside the condenser frame.
CIRCUIT BREAKER (1) (MAIN CIRCUIT BREAKER).
Provides electrical circuit protection for the refrigeration unit. The circuit breaker handle should be in the ON position.
REMOTE BULB THERMOSTAT (2) (TEMPERATURE CONTROL).
Monitors and automatically controls the temperature inside the refrigerator enclosure. The remote bulb thermostat should be
set to the desired refrigerator enclosure temperature.
TOGGLE SWITCH (3) (START/RUN, OFF).
Activates the refrigeration unit. The toggle switch should be in the START/RUN position.
THERMOMETER (4) (REFRIGERATION TEMPERATURE).
Indicates the refrigerator enclosure temperature. The thermometer should indicate within 15o F (7oC) of the temperature set
on the remote bulb thermostat.
PRESSURE GAUGE (5) (DISCHARGE PRESSURE).
Indicates the pressure of the refrigerant gas leaving the compressor. The pressure gauge should generally indicate between
165 and 250 psi (1138 and 1725 kPa); at start up and/or operation in high temperatures, this range can go higher. The inner
scale indicates the temperature of the refrigerant at any given pressure.
COMPOUND GAUGE (6) (SUCTION PRESSURE).
Indicates the pressure of the refrigerant gas entering the compressor. The compound gauge should generally indicate
between 0 and 15 psi (0 and 103.5 kPa); at shutdown and/or operation in low temperatures, this range can go lower. The
inner scale indicates the temperature of the refrigerant at any given pressure.
SIGHT INDICATOR (7) (REFRIGERANT SIGHT GLASS).
Provides a port through which the refrigerant may be observed as it passes through the liquid line of the refrigeration system.
The center indicator changes color as it reacts to moisture in the refrigerant. The sight indicator port should be clear,
indicating liquid refrigerant passing through it. An occasional flash of bubbles is normal as the refrigerant system
automatically adjusts to changing conditions. The center indicator should be green or chartreuse in color.
SIGHT GLASS (8) (COMPRESSOR OIL SIGHT GLASS).
Provides a port through which the oil level in the compressor may be observed. The sight glass port should show an oil level
between 1/4 and 1/2 up the port. Bubbles in or on the oil surface are normal.
HOUR METER (9) (HOUR METER).
Indicates the total number of hours the compressor has operated.
Change 1
0005 00-12
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