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TM 9-4110-257-14
2-2. FAULT CONTROLS AND INDICATORS.
The controls and indicators needed to monitor and reset a fault condition on the refrigeration unit are located on the
control box assembly and inside the condenser frame.
1
Thermometer (REFRIGERATION TEMPERATURE). The thermometer will indicate more than 15° F
(8° C) above or below the remote bulb thermostat setting if a fault occurs in the temperature control
system.
2
Pressure Gage (DISCHARGE PRESSURE). The pressure gage will indicate more than 250 psi
(1725 kPa) or less than 165 psi (1139 kPa) if a fault occurs in the refrigeration system. At start up, shut
down, or operation in high temperatures, this range can go higher.
3
Compound Gage (SUCTION PRESSURE). The compound gage will indicate more than 15 psi
(104 kPa) or less than 0 psi (O kPa) if a fault occurs in the refrigeration system. At start up, shut down, or
operation in low temperatures, this range can go lower.
4
Circuit Breaker (ENGINE FAULT RESET). The circuit breaker button will be extended with a white band
exposed if a fault has caused excessive load on the electrical control system. To reset the circuit breaker,
push it in so the white band is no longer exposed.
5
Ammeter (AMMETER). The ammeter will show a negative (-) number indicating the battery is being
discharged. This normally indicates a failure in the charging system.
6
Dual Pressure Control Switch. The dual pressure control switch will open the electrical control circuit if a
fault in the refrigeration system causes the pressure of the refrigerant gas leaving the compressor to
exceed 300 psi (2070 kPa). Push the reset button to reset the dual pressure control switch.
7
Differential Oil Pressure Switch. The differential oil pressure switch will open the electrical control
circuit if a fault in the refrigeration system causes the compressor oil pressure to drop. Push the reset
button to reset the differential oil pressure switch.
8
Sight Indicator (REFRIGERANT SIGHT GLASS). The sight indicator port will show continuous bubbles
or foam in the refrigerant if there is a fault in the refrigeration system. The center indicator color will be
yellow if moisture in the refrigerant exceeds safe operating limits.
9
Sight Glass (COMPRESSOR OIL SIGHT GLASS). The sight glass port will show the compressor oil level
less than 1/4 up the port or will show the oil foaming if there is a fault in the refrigeration system.
10
Fuel Gage (FUEL GAGE). Indicates below 1/4 level. The fuel tank needs to be filled to maintain a fuel
level above 1/4 for reliable operation.
2-4
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