Piper Arrow IV Turbo Maintenance Manual page 146

9. Close the refrigerant valve and check to see that the sight glass remains clear during system operation.
10. When the sight glass stays clear of bubbles, add an additional 1/4 pound of refrigerant to the system.
(Engine should be operating at 1000 RPM.)
This should be done with OAT at 70°F, or higher, with the air
conditioner operating.
11. Shut off the air conditioner and engine. Remove the charging hose from the Schrader valve with care
due to refrigerant remaining in the line.
A. Replace the access panels.
COMPRESSOR SERVICE.
It is not advisable to service the compressor in the field. It should be done by a qualified shop which has
the special equipment and trained personnel required to properly service the unit.
Maintenance to the York unit and its related components is limited to the replacement of worn drive belt
and magnetic clutch. Any other service requires removal of the compressor from the system. Maintenance to
the Sankyo compressor is limited to replacement of worn drive belt. Contact Sankyo International, 3529 Miller
Park Drive, P.O. Box 2903, Garland, Texas 75042 for special tools and instructions for detailed compressor
maintenance.
An important factor in air conditioning servicing is cleanliness
and care should be exercised to prevent dirt or foreign material
from entering the system. All hose and tubing ends should be
capped immediately. Any lubrication required in the assembly of
the components should be refrigerant oil of the type used in the
compressor.
COMPRESSOR REMOVAL.
The removal of the compressor requires a complete system discharge. (See Discharging.)
1. The removal instructions for the York compressor are as follows:
A. Be certain the circuit protector is off for the air conditioning system.
B. Remove the engine cowling and right front baffles.
C. Disconnect the electrical leads to the magnetic clutch on the compressor.
D. Depressurize the air conditioning system.
E. Remove the suction and discharge lines from the service valves on the compressor.
All open lines should be capped immediately to prevent dirt and
moisture from entering the system.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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1G2
21-50-17
Page 21-27
December 1, 1978