Carrier 19XL User Manual
Page 166
To equalize the pressure differential on a refrigerant isolated 19XL machine, use the
TERMINATE LOCKOUT function of the Control Test in the SERVICE menu. This will help to
turn on pumps and advise the proper procedure. The following procedure describes how to
equalize refrigerant pressure on an isolated 19XL machine without a pumpout unit:
1. Access TERMINATE LOCKOUT function on the Control Test.
2. Turn on the chilled water and condenser water pumps to ensure against freezing.
3. Slowly open the refrigerant cooling isolation valve. The machine cooler and condenser
pressures will gradually equalize. This process will take approximately 15 minutes.
4. Once the pressures have equalized, the condenser isolation valve, the optional hot gas
isolation valve, and cooler isolation valve may now be opened. Refer to
and
, Valves 11, 12, and 14.
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
!
WARNING