Service Valves - Piper PA-32R-301 SARATOGA SP Maintenance Manual

COOLING (cont.)
F General Refrigeration System Procedures (cont.)
(2) System Servicing Precautions (cont.)
(d) Keep refrigerant oil containers tightly sealed and clean to prevent absorption of moisture or
other contamination.
(e) Use only approved refrigeration oil in the compressor. If any doubt exists about the cleanli-
ness of the compressor oil, replace it with new oil.
(f) Never reuse oil removed from the system. Discard it.
(g) When Loctite Refrigerant Sealant has been used on a joint it must be heated to 400F prior to
disassembly. Loctite must be used to seal any pipe threads in the system lines.
A very strong acid (HCL) is formed when R-12 comes in
contact with moisture.
(h) Replace the receiver-dehydrator assembly on any system which has been operating with a
leak allowing air to enter the system. If a receiver-dehydrator is left open to the atmosphere it
should be replaced due to the loss of effectiveness of the drying compound it contains. A new
receiver-dehydrator should be opened and connected to the system only when ready to
charge the system with refrigerant.
(i) Recommended torque values must be used on all flare fitting and O-ring joints. Refer to Chart
3.
Metal Tube
O.D.
1/4
3/80
1/2
5/8
3/4
G. Service Valves
The purpose of the service valve is to service the air conditioning system. (Testing, Bleeding,
Evacuating and Charging). This aircraft is equipped with service valves mounted in the suction and
discharge lines of the evaporator assembly. These valves are the two position type Schrader valves. All
normal air conditioning service should be performed at the evaporator assembly mounted valves.
Service valves are also located on the compressor. However,
use of these valves in servicing is not recommended.
If a Schrader service valve is not serviceable, the core assem-
bly must be replaced.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
— CAUTION —
CHART 3.
ALUMINUM TUBING TORQUE
Thread and Fitting
Size
7/16
5/8
3/4
7/8
1-1/16
— NOTE —
— NOTE —
1I2
Alum. Tubing
Torque
5-7 ft.-lbs.
11-13 ft.-lbs.
15-20 ft.-lbs.
21-27 ft.-lbs.
28-33 ft.-lbs.
21-50-00
Page 21-19
Reissued: July 1, 1993