—WARNING—
A very strong acid (HCL) is formed when Freon comes in contact
with moisture.
—CAUTION—
Replace any receiver-dehydrator assembly which has been
operated after air has leaked into system. The drying compound
is damaged by moisture contained in air.
—CAUTION—
New receiver-dehydrators must only be opened and connected to
system when system is ready to be charged
—NOTE—
For recommended torque values for flare fittings and O-ring
joints, see chart 2104.
CHART 2104. ALUMINUM TUBING TORQUE
Metal Tube Thread and Fitting Alum, Tubing
OD Size Torque
1/4 7/16 5-7 ft lbs
3/8 5/8 11-13 ft lbs
1/2 3/4 15-20 ft lbs
5/8 7/8 21-27 ft lbs
3/4 1-1/16 28-33 ft lbs
SERVICE VALVES
The purpose of the service valve is to service the air conditioning (testing, bleeding, evacuating, and
c h a rging). This aircraft is equiped with service valves mounted in the suction and discharge lines of the
evaporator assembly. These valves are 2-position Schrader valves. All normal air conditioning service should
be performed at the evaporator assembly mounted valves.
—NOTE—
Service valves are also located on the compressor. However, use
of these valves in servicing is not recommended
—NOTE—
If a Schrader service valve is not serviceable, core assembly must
be replaced.
21 - 52 - 00
Page - 21 - 14
Reissued: August 1, 1986
1G4
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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