COCKPIT TEMP CABIN TEMP ENVIRONMENTAL COLD HOT COLD HOT OFF OFF AIR COND LOW FLOOD HI OFF LOW FLOOD HI COCKPIT FAN CABIN FAN PT T Heat exchanger Heat exchanger Condenser assembly PT T P H Compressor Compressor assembly Receiver dryer AFT evaporator FWD evaporator Load shedding function Pilot outlet AFT cabin outlet Cabin vents Drain Expansion valve Evaporator blower From FWD cabin Liquid line (high pressure) Suction line (low pressure) Windshield outlet Copilot outlet Expansion valve Drain Hour meter Pressure relief valve Evaporator blower Evaporator blower Service connection Air conditioning exhaust Discharge line (high pressure) Air conditioning inlet Service connection Temperature sensor Heat exchanger Temperature sensor 100 Amp current limiter Figure 16-80.  The vapor cycle air conditioning system on a Cessna Mustang has two evaporators, one for the cockpit and one for the  cabin. Each evaporator assembly contains the evaporator, a blower, a thermal expansion valve and the temperature feedback line fromthe  outlet of the evaporator to the expansion valve. Condenser  16-50 Regardless of how the vapor cycle air conditioning compressor  is driven, it is usually a piston type pump. It requires use of  a lightweight oil to lubricate and seal the unit. The oil is  entrained by the refrigerant and circulates with it around the  system. The crankcase of the compressor retains a supply of  the oil, the level of which can be checked and adjusted by the  technician. Valves exist on some compressor installations that  can be closed to isolate the compressor from the remainder of  the vapor cycle system while oil servicing takes place.  temperature refrigerant received from the compressor. A fan  is usually included to draw the air through the compressor  during ground operation. On some aircraft, outside air is  ducted to the compressor. On others, the condenser is lowered  into the airstream from the fuselage via a hinged panel. Often,  the panel is controlled by a switch on the throttle levers. It  is set to retract the compressor and streamline the fuselage  when full power is required.  [Figure 16-83] The outside air absorbs heat from the refrigerant flowing  through the condenser. The heat loss causes the refrigerant  to change state back into a liquid. The high-pressure  liquid refrigerant then leaves the condenser and flows to  the receiver dryer. A properly engineered system that is  The condenser is the final component in the vapor cycle. It  is a radiator-like heat exchanger situated so that outside air  flows over it and absorbs heat from the high-pressure, high-