Service Valves; Service Valve Replacement; Charging Station And Hand Manifold Set - Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual

PIPER CHEROKEE WARRIOR SERVICE MANUAL
Use service valves to service air conditioning system (testing, bleeding, evacuating, and charging). The
a i rcraft is equipped with service valves mounted in the suction and discharge lines of the evaporator assembly
located behind rear close-out panel. These valves are two-position screw-on type Schrader valves. Use these
valves for all normal air conditioning serv i c i n g.
YORK COMPRESSOR SCHRADER CHARGING VALVE
14-8.

SERVICE VALVE REPLACEMENT.

If air conditioning refrigerant lines or system is opened, lines
and fittings must be C A P P E D and sealed immediately to prevent
dirt and other contaminants from entering the system. ( D O
NOT put a PLUG into the hoses or fittings.)
Valves on the compressor used on Warrior II models are sealed with a gasket in the valve port boss and
should not be used to service the system.. Lubricate gasket with tube fitting facing aft and secure with 0.312
bolts; tighten to a torque of 15 to 23 inch pounds.
14-9.

CHARGING STATION AND HAND MANIFOLD SET.

United States environmental regulations prohibit the intentional
release of refrigerant into the atmosphere.
United States environmental regulations require that an approved charging station be used when
s e rvicing any air conditioning system. The following text, describing the use of a charging station, is in
r e f e rence to the Robinair 34700 and should be augmented by reference to the instructions supplied by
R o b i n a i r. This does not imply that Piper Aircraft specifically recommends the use of the Robinair 34700.
Refer to the instructions supplied by the manufacturer if another brand of station is employed.
The Warrior II utilizes R12 refrigerant, which uses mineral oil as a lubricant. The service valves are
threaded screw-on type. Newer systems utilizes H F C134a refrigerant, which uses polyalkylene-glycol
(P.A.G.) as a lubricant. Because mineral oil and P.A.G. are not compatible, a separate manifold test set and/or
test stand must be used for each system.
Revised: February 28, 1995
SCHRADER INLINE SERVICE VALVE
Figure 14-2. Service Valves
CAUTION
NOTE
3A22
Island Enterprises
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