2. The installation instructions for the Sankyo compressor are as follows:
A. Place the compressor in the mounting brackets and install attachment bolts. Do not torque
attachment bolts at this time.
B. Install compressor drive belt. Rotate compressor drive belt. Rotate compressor in mounting
bracket slots to obtain a belt tension of 85 to 90 pounds. Torque the four attachment bolts 300 to
350 inch-pounds. (Refer to Adjustment of Drive Belt Tension.)
C. Check the oil level in the compressor in accordance with instructions given in Check Compressor
Oil.
D. Connect the discharge and suction lines to their respective fittings.
E. Evacuate and charge the system per Evacuating the System and Charging the System.
—WARNING—
If the air conditioner is to be operated on the ground for
servicing, the test area should be clean and free of any loose
objects lying on the ramp. Only the service valves located on the
evaporator assembly should be used for testing.
CHECK COMPRESSOR OIL.
The oil level should be checked any time the system is discharged.
1. The following steps should be followed to perform York compressor oil check.
A. It will be necessary to discharge the system. (Refer to Discharging.)
B. Fabricate an oil dipstick. (Refer to Figure 21-14.)
C. Remove the oil fill plug. (A .375 inch plug in the top side of the compressor crankcase.)
D. Before inserting the dipstick, the crankshaft Woodruff key should be located in the up position.
(The front face of the compressor clutch is marked with a stamped “K” indicating the key
position.) The oil level should be measured from the lowest point in the crankcase. Use the long
end of the dipstick. (See Figure 21-14.)
E. With the compressor in the installed position use Chart 2106 to determine the amount of oil in
crankcase.
F. The compressor should never be operated with less than 6 ounces of oil. When oil is added the
level should not go above 10 ounces. Piper refrigerant oil PMS-L2000 or equivalent 500 viscosity
refrigerant oil must be used.
G. Evacuate and charge system. (Refer to Evacuating the System and Charging the System.)
—NOTE—
The 10 ounce oil level is required in compressors installed on
new systems. Some oil is distributed in the system during
operation. Replacement compressors should be charged with 10
ounces of oil.
—CAUTION—
The oil plug should not be removed with pressure in the system.
21-50-19
Page 21-29
December 21, 1981
1G4
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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