Chapter 9- Refrigerants
Charging the System with Liquid Refrigerant
This process is used as a time-saver, but requires much more care to avoid
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
4. Open the refrigerant dispensing valves and hand valves on
the hose and gauge set. Liquid refrigerant flows into the
Figure 9-6 illustrates how to connect the manifold gauge set
when adding liquid at the compressor (or accumulator).
Adding refrigerant liquid to
partially charge the AC
system is illustrated and
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