THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 13
Jun 1/03
2D1
21-50-00
C. Servicing the System with a Charging Stand (Ref. PPS 50003-3, Rev. C)
CAUTION
: MINERAL OIL AND PAG ARE NOT COMPATIBLE. USE A SEPARATE MANIFOLD
TEST SET AND / OR TEST/CHARGING STAND AND RECOVERY SYSTEM FOR
EACH REFRIGERANT TYPE.
CAUTION: USE RECOVERY UNIT SPECIFICALLY DESIGNED FOR THE TYPE OF
REFRIGERANT USED IN THE AIRCRAFT SYSTEM. UNINTENDED AFFECTS MAY
OCCUR IF REFRIGERANTS ARE COMBINED.
(1) Discharging (Bleeding/Purging) the System (with a Robinair 34700 or similar charging
stand/recovery station) (see Figures 2 and 5) (Required only if system contains refrigerant.)
CAUTION: APPLIES TO ROBINAIR 34700 OR SIMILAR CHARGING/RECOVERY
STATION. SEE OPERATOR'S MANUAL OF STATION BEING USED FOR
DETAILED INSTRUCTIONS FOR DISCHARGING SYSTEM.
NO
TE: The term “Discharge,” as used throughout this section, in no sense implies or
suggests discharging refrigerant to atmosphere. In all cases when discharging, an
enviormentally approved refrigerant recovery station is to be used.
(a) Gain access to service valves by removing rear closeout panel in cabin.
(b) Remove protective caps from service valves.
(c) Connect high side (red) hose to air conditioner high side service valve. On systems
equipped with quick disconnect connections, open coupler valve.
(d) Connect low side (blue) hose to air conditioner low side service valve. On systems
equipped with quick disconnect connections, open coupler valve.
(e) Check the low side gauge (GAUGE 1) and high side gauge (GAUGE 2) to determine that
there is pressure in the system. If there is no pressure, there is no refrigerant in the
system to recover.
(f) Check that the oil drain valve is closed.
(g) Open both the low side and high side valves on control panel.
ALUMINUM TUBING
Metal Tube O.D. Thread and Fitting Size Ft./Lb.
1/4 7/16 5-7
3/8 5/8 11-13
1/2 3/4 15-20
5/8 7/8 21-27
3/4 1-1/16 28-33
FLARE CONNECTIONS O-RING CONNECTIONS
Tube OD Thread size Ft./Lb. Tube OD Thread size Ft./Lb.
3/8 5/8 18-20 3/8 5/8 11-13
1/2 3/4 36-39 1/2 3/4 15-20
5/8 7/8 52-57 5/8 7/8 21-27
CHART 3
RECOMMENDED TORQUE SPECIFICATIONS
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