WD Catalog 2018

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Chapter 9 - Refrigerants
9-10 - -
Charging the System with Liquid Refrigerant
This process is used as a time-saver, but requires much more care to avoid
compressor damage.
1. Check the amount of refrigerant recovered, and add approxi-
mately two thirds of that amount, and no more than recom-
mended by the manufacturer (in pounds and ounces).
2. Connect the center service hose from the gauge set to the
refrigerant container dispensing valve.
3. Add refrigerant liquid through the compressor discharge ser-
vice valve (high side of system). If an accumulator is used, add
the liquid refrigerant (and gas during final charging) via a
Schrader valve.
4. Open the refrigerant dispensing valves and hand valves on
the hose and gauge set. Liquid refrigerant flows into the
system.
Figure 9-6 illustrates how to connect the manifold gauge set
when adding liquid at the compressor (or accumulator).
LOW SIDE HAND
VALVES CLOSED
HIGH SIDE
SERVICE VALVE
0
100
200 300
400
500
HIGH
TEMPERATURE
LOW
TEMPERATURE
150
120
90
60
30
0
10
20
30
REFRIGERANT TANK
INVERTED HIGH SIDE HAND
VALVES OPEN
LOW SIDE
SERVICE VALVE
CHARGING HOSE
SUCTION HOSE
DISPENSING VALVE
HIGH SIDE HOSE
5. When you have added two thirds of the recorded, actual
recovered amount of refrigerant, shut off the refrigerant sup-
ply. If you added liquid refrigerant at the compressor high side
service fitting, there may be liquid in the compressor. Attach a
wrench to the nut holding the clutch the compressor shaft.
Turn the compressor shaft a few times in the direction of
normal rotation to clear any liquid from the compressor.
6. Finish charging the system with refrigerant gas by starting
the engine and AC system. Follow the procedure for charging
with gas as shown in Figure 9-5.
Figure 9-6
Adding refrigerant liquid to
partially charge the AC
system is illustrated and
described.