Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 325 / 1956

PAGE 7
Feb 28/07 2D23
21-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
3. Servicing Cooling System
(PIR-PPS50003-4, Rev. C.)
NOTE: The maximum refrigerant capacity is 2.75 pounds. The total refrigerant capacity required is
determined separately for each system and is the amount that will result in bubble-free
operation at the sight gauge, as specified in the post charging operational check.
A. Definitions
(1) High Side. The “high side” consists of all lines and components between the compressor outlet
and the expansion valves. It includes the condenser and receiver/dryer sight gage.
(2) Low Side. The “low side” consists of all lines and components between the expansion valves
and the compressor inlet. It includes the evaporators.
B. Service Valves (i.e. - ports) (See Figures 1 and 2.)
(1) Description
The service valves are installed to Test, Bleed (Discharge), Evacuate and Charge the air
conditioning system. This airplane is equipped with inline service valves mounted on the
manifold assembly. All normal air conditioning service should be performed at the manifold
assembly mounted valves.
NOTE: Service valves are also located on the compressor in S/N’s 4636001 thru 4636186
only . However, use of these valves in servicing is not recommended.
NOTE: In S/N’s 4636001 thru 4636186 only , the service valves are screw-on type Schrader
valves.
In S/N’s 4636187 and up , the service valves are quick-disconnect type Schrader
valves.
NOTE: If a Schrader service valve is not serviceable, the core assembly must be replaced.
(2) Replacement
CAUTION: WHENEVER THE AIR CONDITIONING REFRIGERANT LINES OR SYSTEM
ARE OPENED FOR ANY REASON, THE LINES AND FITTINGS SHOULD BE
CAPPED AND SEALED IMMEDIATELY TO PREVENT DIRT AND OTHER
CONTAMINANTS FROM ENTERING THE SYSTEM. (DO NOT PUT A PLUG
INTO THE HOSES OR FITTINGS.)
The valves on the compressor, when installed, are sealed with a gasket placed beneath the
service port. Lubricate the gasket with refrigerant oil of the type used in the compressor, place
the valves on the compressor. Torque the port from 9 to 12 ft. lbs.
When installing the valves on the manifold assembly, lubricate the threads with Tite Seal 3 (Do
not apply to the first two threads).