TM 9-2320-280-20-11-32. M997, M997A1, AND M997A2 AMBULANCE AIR-CONDITIONINGSYSTEM OPERATIONThe air-conditioning system covered in this manual applies only to the M997, M997A1, and M997A2vehicles and consists of the following major components:COMPRESSOR- Inside the compressor, low pressure gas refrigerant is compressed into a highpressure gas that is pushed into the condenser by the compressor.DISCHARGE LINE - High pressure gas is carried through the discharge line from the compressorto the condenser.CONDENSER- Refrigerant enters the condenser as a high pressure gas. When condensed, itgives up its heat to the outside air and becomes a high pressure liquid.LIQUID LINE - High pressure liquid refrigerant is carried back to the evaporator by the liquidline to repeat the evaporation/condensation cycle.EXPANSION VALVE - High pressure liquid refrigerant enters a non-adjustable expansion valvewhere the refrigerant is formed into a liquid spray.EVAPORATOR- Refrigerant enters evaporator as a liquid spray. It absorbs heat from the air inthe patient compartment and vaporizes into a low pressure gas.SUCTION LINE - Refrigerant in low pressure gas form is drawn from the evaporator by thesuction action of the compressor.1-54
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