Test Gauge Manifold Set 1I4 - Piper PA-32R-301 SARATOGA SP Maintenance Manual

COOLING (cont.)
I. Test Gauge Manifold Set
Compound
Pressure Gauge
To Suction
ServiceValve
The proper testing and diagnosis of the air conditioning system requires that a manifold gauge set be
attached into 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 4
and 5).
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 and low pressure sides of the manifold have hand shut-off valves. When the hand valve
is turned clockwise all the way in the manifold is closed. The pressures on that side of the system will
be recorded on the gauge above the hose.
Cracking the hand valve in a clockwise direction opens the system to the middle service port of the
manifold set. This is desirable only when necessary to let refrigerant out of or into the system. (Refer
to Figures 4 and 5).
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
20
30
10
40
0
50
10
20
60
30
Test Gauge Manifold Set
Figure 4
1I4
300
200 400
500
100
0 600
To Discharge
Service Valve
To Vacuum Pump or
Refrigerant Cylinder
High
Pressure Gauge
21-50-00
Page 21-21
Reissued: July 1, 1993