Addition Of Partial Charge To System; Component Service 1I13; Compressor Service - Piper PA-32R-301 SARATOGA SP Maintenance Manual

COOLING (cont.)
N. Addition Of Partial Charge To System
Top off system with refrigerant by the following method:
(1) Remove access panel at rear of the cabin.
(2) Connect a charging hose to a refrigerant cylinder and also to Schrader valve fitting on suction
line. (Refer to Figure 9.)
(3) Purge charging hose by allowing a small amount of refrigerant gas to escape at Schrader valve
fitting.
(4) Start airplane engine and operate at 1000 rpm Turn the conditioner on maximum cool.
(5) Remove plastic plug from sight glass on top of receiver-dehydrator.
(6) With a low refrigerant charge in the system, bubbles will be seen through sight glass when system
is operating.
(7) Open valve on refrigerant cylinder.
(8) Allow refrigerant to flow into system until bubbles disappear from sight glass.
(9) Close refrigerant valve and check that sight glass remains clear during system operation.
(10) When sight glass stays clear of bubbles, add an additional 1/4 pound of refrigerant to system.
(Engine should be operating at 1000 RPM.)
Perform procedures above with 70˚ F OAT or higher, and with
air conditioner operating.
(11) Shut off air conditioner and engine. Remove charging hose from Schrader valve with care. Some
residual refrigerant will remain in line.
(12) Install access panels.
O. Component Service
Cleanliness and care must be exercised to prevent dirt or
foreign material from entering the system. All hose and tubing
ends must be capped immediately. Lubrication required during
assembly of components must be refrigerant oil of same type
used in compressor.

(1) Compressor Service

Do not service compressor in the field. Service must be accomplished only by a qualified shop
having the special equipment and trained personnel to properly service unit.
Field service to compressor, and its related components, is limited to replacement of worn drive
belt and magnetic clutch. Any other service requires removal of compressor from the system.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
— NOTE —
— CAUTION —
1I13
21-50-00
Page 21-30
Reissued: July 1, 1993