Figure 21-4. Test Gauge and Manifold Set
TEST GAUGE AND MANIFOLD SET
Proper air conditioning system testing and diagnosis requires that a manifold gauge set be attached to the
system. This set consists of two gauges mounted to a manifold. One gauge is a high pressure gauge used on
discharge side of system. The other is a low pressure gauge used on suction side of system. The manifold is a
device having fittings for both gauges and connection hoses with provisions for controlling flow of refrigerant
through manifold. See figures 21-4 and 21-5.
The center port of manifold set is used for charging or evacuation procedures.
Both high and low side of manifold have hand shut-off valves. When hand valve is turned in a clockwise
direction, manifold is closed. The pressures on that side of system will, however, be recorded on the gauge
above hose.
Turning hand valve in counterclockwise direction, opens system to middle service port of manifold set.
This valve allows refrigerant out of or into system. Refer to figures 21-4 and 21-5.
CHECKING THE SYSTEM FOR LEAKS
There are several methods of checking system for leaks, depending on type of equipment which is
available. Two methods of performing this check are covered in following paragraphs.
21 - 52 - 00
Page - 21 - 16
Reissued: August 1, 1986
1G6
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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