Optional Equipment
Air
−
Conditioning System
CSP
−
902RFM207E
−
1
ROTORCRAFT FLIGHT MANUAL
MD900 (902 Configuration with PW 207E)
FAA Approved
Reissue 2
Original
10
−
3
10
−
5. OPERATING INSTRUCTIONS: AIR CONDITIONING
(P/N900P7250302
−
103)
PART I
GENERAL
The air-conditioning system circulates conditioned air throughout the cabin. A five
position rotary switch AC/VENT controls the vent fan and air-conditioning. COOL
HIGH provides air-conditioning at a high setting. COOL LOW provides air-condi
tioning at a low setting, selected from the center console utility panel assembly.
The air-conditioning system provides ventilation, temperature, and humidity con
trol. The air-conditioning system consists of:
Freon Compressor Assembly -
Compresses the air conditioning system refriger
ant.
Lines and Tubing -
Routes refrigerant throughout the air conditioning system.
Condenser -
Heat exchanger for the condensing refrigerant.
Receiver Dehydrator -
Removes moisture from the air conditioning system refrig
erant.
High Pressure Switch -
Turns off the compressor in a high pressure condition
to prevent damage to air conditioning system.
Low Pressure Switch -
Activates or deactivates the Freon compressor assembly
in a low pressure condition to prevent damage to the air conditioning system.
Thermal Expansion Valve -
Regulates air conditioning system refrigerant injected
into the evaporator.
Evaporator -
Heat exchanger that cools cabin air.
Evaporator Fan -
Induces airflow through evaporator.
Three Way Valve Duct Assembly -
Controls the flow of recirculated cabin air
or ambient air to the air conditioning system.
Three Way Valve Control Cable -
Controls position of the three way valve.
The compressor is mounted on the gearcase of the right hand engine. The condensers
are attached to the oil cooler blowers. The evaporator occupies the forward end
of the upper cowling. The air conditioning system makes use of the ventilation sys
tem's ducting to direct the cooled air to cabin and cockpit, but adds a manual valve
to permit selection of fresh or recirculated air. The knob for this push/pull control
is on the rear cockpit wall above the pilot's right shoulder. Other air conditioner
controls are located on the Utility panel
.
Summary of Contents for MD900 Explorer
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