PIPER CHEROKEE SERVICE MANUAL
XIV - ACCESSORIES AND UTILITIES
01/31/08
4J6
SECTION XIV
ACCESSORIES AND UTILITIES
14-1. AIR CONDITIONING INSTALLATION.
14-2. DESCRIPTION.
This installation consists of a compressor with its special bracketry, an evaporator, a condenser, a
receiver-dehydrator, circulating fan, thermal expansion valve, and related plumbing.
The evaporator filters, dehumidifies and cools the air. The evaporator is mounted in a fabricated housing
along with the receiver-dehydrator, circulating fan, thermal expansion valve and related plumbing. This
housing is located at the rear of the cabin, aft of the baggage area. The compressor is a two cylinder,
piston type compressor which is supported by special bracketry at the front of the engine. A V-belt
connected to the engine ring gear drives the compressor through a magnetic clutch. The condenser is
installed on a hinge mounted door that is located on the bottom portion of the fuselage tail section. The
condenser door is hinge mounted to allow extension into the airstream during system operation. The
condenser door is electrically activated to provide the following positions, (system on - fully extended or
system off - fully retracted).
The system is protected by a Ranco type pressure switch which automatically controls the condenser
maximum head pressure by temporarily de-clutching the compressor in the event the pressure becomes
excessively high. The controls are located on the aircraft instrument panel adjacent to the heater and
defroster levers, and consist of an Air Conditioning control, a fan control to govern the cold air velocity,
and a temperature control.
The system design is such that there is no increase in drag to the aircraft during its take-off flight
conditions. During maximum power demands the compressor is de-clutched and the condenser door is
automatically retracted.
14-3. AIR CONDITIONING SYSTEM OPERATION.
The air conditioning system in this aircraft is a recirculating, independent unit. It filters dehumidifies and
cools the air as it cycles through the evaporator. The unit is operated from controls mounted on the right
side of the instrument panel. The air conditioning master switch has three positions on early models:
“FAN only, OFF and AIR COND” and a two-position ON-OFF switch on later models. When the “AIR
COND” position is selected the compressor clutch engages, the condenser scoop opens and the
circulating fan is turned on. The temperature is controlled by a thermostat operated by the temperature
control selector. A three-position fan switch (LOW-MED-HIGH) operates the blower. The fan may be
operated to circulate air without using the air conditioning unit.
The air conditioning system uses Refrigerant 12 as the refrigerant. The refrigerant enters the compressor
as a vapor. The Compressor pressurized the heat-laden vapor until its pressure and heat reach a point
much hotter than the outside air. The compressor then pumps the vapor to the condenser where it cools
and changes to a liquid. The liquid then passes to the receiver-dehydrator. Its function is to filter, remove
any moisture and ensure a steady flow of liquid refrigerant into the evaporator through the expansion
valve. The expansion valve is a temperature controlled metering valve which regulates the flow of the
liquid refrigerant to the evaporator. The evaporator absorbs the heat from the air passing over the coils.
From the evaporator the refrigerant vapor returns to the compressor where the cycle is repeated.
Summary of Contents for Cherokee 140 PA-28-140
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