6-2
T-294-01
6.3 MANIFOLD GAUGE SET
The manifold gauge set can be used to determine system
operating pressure, add a refrigerant charge, and to
equalize or evacuate the system.
Figure 6-2 shows hand valves, gauges and service ports
“A, C and B.” When the low pressure hand valve is
frontseated (turned all the way in), the low (suction)
pressure can be checked. When the high pressure hand
valve is frontseated, high (condensing) pressure can be
checked. When both valves are open (turned
counter-clockwise all the way out), high pressure vapor
will flow into the low side. When the low pressure valve
is open, the system can be charged. Oil can also be
added to the system.
Only a R-134a manifold gauge set with self-sealing
hoses, as shown in Figure 6-3 (CTD P/N 07-00294-00,
which includes items 1 through 6) can be used when
working on the models covered within this manual.
Opened
(Backseated Hand Valve )
Closed
(Frontseated Hand Valve)
Low Pressure
Gauge
High Pressure
Gauge
A
B
C
A. Service Port to Low Side of System
B. Service Port to High Side of System
C. Service Port to Either: Refrigerant Cylinder, Oil
Container or Vacuum Pump
Figure 6-2. Manifold Gauge Set
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