To equalize the pressure differential on a refrig erant isolated 19XL machi ne, use the
TERMINATE LOCKOUT fu nction of the Control Test in the SERVICE menu. This wi ll he lp to
turn on pumps and advise the proper procedure. The following procedure describes how to
equalize refrigerant pressure on an isolate d 19X L machine without a pumpo ut unit:
1. Access TERMINATE LOCKOUT function on the Control Test.
2. Turn on the chilled wate r and condenser water pum ps to ensure against freezing .
3. Slowly open the refrig erant cooling isolat ion valve. The machine cooler an d condenser
pressures will gradua lly equalize. This proc es s wi ll take approximately 15 minutes.
4. Once the pressures ha v e equ alized, the condense r isolation valve, the opt ional hot gas
isolation valve, an d c ool er isolation valve may no w be opened. Refer to Figure 27 and
Figure 28, Valves 11, 12, and 14.
Whenever turning the discharge isolation val ve, be sure to re-attach the va lve
locking device. This will prevent the valve from opening or closing during service
work or during machine operation.
WARNING !WARNING
Click here f or Table 8 — Co ntrol Test Men u Functions