THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 23
Jun 1/03
2D11
21-50-00
D. Servicing the System with a Manifold Set
(1) Test Gauge and Manifold Set
The proper testing and diagnosis of the air conditioning system require that a manifold gauge
set (or a charging stand) be attached to the system. This set consists of two gauges mounted
to a manifold. One gauge is a high pressure gauge used in the discharge side of the system.
The other is a low pressure gauge used in the suction side of the system. The manifold is a
device having fittings for both gauges and connection hoses with provisions for controlling the
flow of refrigerant through the manifold. (Refer to Figures 6 and 7.)
The center port of the manifold set is used for charging or evacuation procedures, or any other
service that may be necessary.
Both the high or low side of the manifold have hand shut-off valves. When the hand valve is
turned all the way in, in a clockwise direction, the manifold is closed. The pressures on that
side of the system will, however, be recorded on the gauge above the hose.
Cracking the hand valve, in the counterclockwise direction, opens the systems to the middle
service port of the manifold set. This is desirable only when it is necessary to let refrigerant out
of or into the system. (Refer to Figures 6 and 7.)
Test Gauge and Manifold Set
Figure 6
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