IOM Manual

TRANE ®
System Refrigerant
Charging Procedures
Unit Evacuation
1. Evacuate the unit after leakage test.
2. Attach appropriate hoses from
manifold gauge to suction and liquid line
charging port (See Figure 11).
Refrigerant Line Insulation
and Isolation
Insulate the suction line and refrigerant
tubes together, and also insulate liquid
lines exposed on extreme temperatura.
Insulate liquid and suction line
separately and isolate them from each
other. Isolate all refrigerant tubes from
the structures and air ducts.
Note: Isolate the refrigerant tubes from
the building to avoid possible noise and
vibration.
Figure 11
Note: Unnecessary switching of hoses
can be avoided and complete
evacuation of all lines leading to sealed
system can be accomplished with
manifold center hose and connecting
branch hose to a cylinder of refrigerant
and vacuum pump.
Figure 12
3. Connect the center hose of manifold
gauge to a vacuum pump.
4. Evacuate the unit to hold a 46Pa
vacuum.
5. Close the valve to the vacuum pump
and observe the gauge. If gauge
pressure rises above 66Pa within a
minute, it indicates that the vacuum
is not completed or the system has a
leak.
6. If the gauge pressure does not rise
above 66Pa within a minute, it
indicates that the vacuum is
completed.
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