Charging Hookup Diagram - Piper Navajo Chieftain PA-31-350 Service Manual

412
CONDENSER
DEHYDRATOR
EXPANSION
SIGHT GLASS VALVES
NOTE
ITEMS INSIDE
FIREWALL
DASHED LINE ARE
SERVICE EQUIPMENT
SCHRADER VALVES
.....................
GUAGE SET
EVAPORATORS
Figure 14-38. Charging Hookup
d.
Check pulley alignment by one of the following methods:
1.
Visually check the alignment of the compressor pulley with the crankshaft pulley, there
must not be any misalignment.
2. A half inch rod about 18 inches long can also be used to check pulley alignment before
installing the drive belt, by laying the rod in the pulley grooves and making sure the rod falls squarely in the
two pulley grooves.
NOTE
Assure that the drive belt is properly aligned. Misalignment
produces rapid belt wear.
e. Check the oil level in the compressor in accordance with instructions given in paragraph 14-104.
f. With the service valves still (closed), connect them to the compressor.
g.
Close all valves (counterclockwise) on the charging stand, and remove the gauge port cap from
the low pressure service valve.
h. Connect the blue, low pressure, charging line to the low pressure gauge port. (Refer to Figure 14-39.)
i. Operate the vacuum pump and open both the low pressure control valve and the vacuum control
valve on the charging stand. Continue to operate pump for 5 minutes after 26 to 28 inches of vacuum is
reached.
j. After evacuation, close both the low pressure control valve and vacuum control valve. Wait 5
minutes and observe the vacuum gauge, no more than a 2 inch drop in vacuum is allowed. If the 26 inch
vacuum cannot be attained or if the rise in pressure exceeds 2 inches, check the compressor for leaks. Turn
off the vacuum pump.
Reissued: 9/23/80
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ACCESSORIES AND UTILITIES
4 H8
NAVAJO CHIEFTAIN SERVICE MANUAL