Air Conditioning - Piper Aircraft Corporation Seneca II PA-34-200T Pilot Operating Handbook

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DESCRIPTION AND OPERATION
PIPER AIRCRAFT CORPORATION
PA-34-200T, SENECA II
NOTE
When operating weather avoidance radar systems inside of
moderate to heavy precipitation, it is advisable to set the range
scale of the radar to its lowest scale.
7.43 AIR CONDITIONING
The air conditioning system is a recirculating air system. The major components include an evaporator,
a condensor, a compressor, a blower, switches and temperature controls.
The evaporator is located behind the rear baggage compartment. This cools the air used for the air
conditioning system.
The condensor is mounted aft of the firewall on the left engine. A retractable condensor scoop extends
when the air conditioner is on and retracts to a flush position when the air conditioner is off.
If the air conditioner is operated on the ground, the condenser scoop operates to a ground opening
position which is larger than the in-flight opening. A circuit through the squat switch on the right main gear
prevents the scoop operating to the ground opening when the aircraft is in flight.
The compressor is mounted on the rear left side of the left engine. It has an electric clutch which
automatically engages or disengages the compressor to the belt drive system of the compressor.
Air from the baggage area is drawn through the evaporator by the blower and distributed through an
overhead duct to individual outlets located adjacent to each occupant.
The switches and temperature control are located on the lower right side of the instrument panel. The
temperature control regulates the temperature of the cabin. Turning the control clockwise increases
cooling; counterclockwise decreases cooling.
The fan speed switch and the air conditioning ON-OFF switch are inboard of the temperature control.
The fan can be operated independently of the air conditioning; however, the fan must be on for air
conditioner operation. Turning either switch off will disengage the compressor clutch and retract the
condensor door. Cooling air should be felt within one minute after the air conditioner is turned
on.
NOTE
If the system is not operating in 5 minutes, turn the system OFF
until the fault is corrected.
The fan switch allows operation of the fan with the air conditioner turned OFF to aid in cabin air
circulation. "LOW" or "HIGH" can be selected to direct a flow of air through the air conditioner outlets in
the overhead duct. These outlets can be adjusted or turned off individually.
The condenser door light is located to the left of the warning gear unsafe light in front of the pilot.
The door light illuminates when the door is open and is off when the door is closed.
A circuit breaker on the circuit breaker panel protects the air conditioning electrical system.
REPORT: VB-850
7-36
ISSUED: AUGUST 23, 1976
REVISED: AUGUST 30, 1978