|
| |
TM 9-4110-257-14
2-1. OPERATING CONTROLS AND INDICATORS. - Continued
4
Thermometer (REFRIGERATION TEMPERATURE). Indicates the refrigerator enclosure temperature.
The thermometer should indicate within 15° F (8° C) of the temperature set on the remote bulb thermostat.
5
Pressure Gage (DISCHARGE PRESSURE). Indicates the pressure of the refrigerant gas leaving the
compressor. The pressure gage should generally indicate between 165 and 250 psi (1139 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.
6
Compound Gage (SUCTION PRESSURE). Indicates the pressure of the refrigerant gas entering the
compressor. The compound gage should generally indicate between 0 and 15 psi (O and 104 kPa), at
shut down and/or operation in low temperatures, this range can go lower. The inner scale indicates the
temperature of the refrigerant at any given pressure.
7
Sight Indicator (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.
8
Sight Glass (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 is normal.
9
Hourmeter (HOURMETER). Indicates the total number of hours the engine/compressor has operated.
10
Lamp (DEFROST IN PROGRESS). Indicates, by illuminating, when the refrigeration unit is operating in a
defrost cycle.
11
Fuel Gage (FUEL GAGE). Indicates the relative level of fuel in the fuel tank. The gage should always be
above 1/4 mark during normal operation.
12
Ammeter (AMMETER). Indicates approximate amperage and relative flow of current to or from the
battery. Flow from the battery (discharging) is indicated by negative (-) numbers and flow to the battery
(charging) is indicated by positive (+) numbers. The ammeter should indicate a positive flow during
normal operation, the amperage will vary depending on conditions.
2-2
|
