Carrier 19XL - Manual (Page 167)

19XL Machine Equalization with Pumpout Unit
The following procedure describes how to equalize refrigerant pressure on an isolated 19XL
machine using the pumpout unit:
1. Access the TERMINATE LOCKOUT mode in the Control Test.
2. Turn on the chilled water and condenser water pumps to prevent possible freezing.
3. Open valve 4 on the pumpout unit and open valves 1a and 1b on the cooler and condenser,
Figure 27 and Figure 28 . Slowly open valve 2 on the pumpout unit to equalize the pressure.
This process will take approximately 15 minutes.
4. Once the pressures have equalized, the discharge isolation valve, cooler isolation valve,
optional hot gas bypass isolation valve, and the refrigerant isolation valve can be opened.
Close valves 1a and 1b, and all pumpout unit valves.
The full refrigerant charge on the 19XL will vary with machine components and design
conditions, indicated on the job data specifications. An approximate charge may be found by
Whenever turning the discharge isolation valve, be sure to re-attach the valve
locking device. This will prevent the valve from opening or closing during service
work or during machine operation.
WARNING
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WARNING