THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 1
Jun 1/03
2C13
21-50-00
COOLING
WARNING: FAILURE TO CONSULT APPLICABLE VENDOR PUBLICATION(S), WHEN SERVICING
OR INSPECTING VENDOR EQUIPMENT INSTALLED IN PIPER AIRCRAFT, MAY
RENDER THE AIRCRAFT UNAIRWORTHY. (SEE INTRODUCTION - SUPPLEMENTARY
PUBLICATIONS.)
1Fresh Air (Standard) (See 21-20-00.)
When the optional air conditioning system is not installed cabin ventilation and cooling is provided solely
by fresh air through the overhead vent system.
2. Air Conditioning (Optional)
A. Description and Operation (Refer to Figure 1.)
WARNING: WHEN SERVICING THE AIR CONDITIONING SYSTEM, BE SURE TO IDENTIFY
THE SPECIFIC REFRIGERANT, LUBRICANT, AND COMPONENTS USED IN THE
PARTICULAR INSTALLATION. THE AIR CONDITIONING SYSTEM INSTALLED IN
THESE AIRPLANES USES HFC-134A REFRIGERANT.
NO
TE: Operate air conditioning system at least once a month to keep system lubricated and
prevent sticking valves.
This installation consists of a compressor with special mounting brackets, and an evaporator,
condenser, receiver-dehydrator, circulating fan, high pressure switch, and related plumbing.
The compressor is a Sanden five cylinder piston type mounted opposite the alternator at engine
front. A V-belt connected to engine ring gear drives the compressor through a magnetic clutch. The
evaporator filters, dehumidifies, and cools air. The evaporator is mounted in a fabricated housing
with the receiver/dehydrator, circulating fan, high pressure switch, and related plumbing which is in
the rear fuselage, aft of baggage area closeout panel. The condenser is mounted on a door in the
bottom of the fuselage section which is designed to allow extension into airstream during system
operation. Electrically activated, the door extends when the system is ON and retracts when the
system is OFF.
The system is designed not to increase aerodynamic drag during take-off and other maximum
power operations. A micro-switch connected to the throttle de-clutches the compressor and retracts
the condenser door automatically when full power is applied. To ensure maximum performance,
however; the air conditioner is placarded to be switched off for takeoff.
The air conditioning system is a recirculating, independent unit. It filters, dehumidifies, and cools air
as air cycles through evaporator. The unit operates from controls mounted on right side instrument
panel. The air conditioning master switch has two positions, ON-OFF. If AIR COND position is
selected, the compressor clutch engages, the condenser scoop opens, and the circulating fan is
turned on. Temperature is controlled by temperature control selector thermostat. A two position fan
switch (LOW-HIGH) operates the blower. The fan may be operated to circulate air without using air
conditioning unit.
A pressure switch protects the system and automatically controls condenser maximum head
pressure by temporarily declutching the compressor if pressure becomes excessively high. The air
conditioning control switch, a fan control switch to govern cold air velocity, and a temperature
control are on aircraft instrument panel adjacent to heater and defroster levers.
To Next Page
Loading...
