Prolonged Shutdown; Restart After Prolonged Shutdown - York YMC2 Operation And Maintenance

FORM 160.84-OM1
ISSUE DATE: 9/21/2017

PROLONGED SHUTDOWN

If the chiller is to be shut down for an extended period
of time (for example, over the winter season), the fol-
lowing procedure should be followed.
1. Test all system joints for refrigerant leaks with a
leak detector. If any leaks are found, they should
be repaired before allowing the system to stand
for a long period of time.
During long idle periods, the tightness of the sys-
tem should be checked periodically.
2. If freezing temperatures are encountered while
the system is idle, carefully drain the cooling wa-
ter from the cooling tower, condenser, condenser
pump, and the chilled water system-chilled water
pump and coils.
Open the drains on the evaporator and condenser
liquid heads to assure complete drainage. Drain
the Variable Speed Drive cooling system.
JOHNSON CONTROLS
SECTION 2 - SYSTEM OPERATING PROCEDURES
3. On the SETUP Screen, disable the clock. This
conserves the battery.
4. Open the main disconnect switches to the VSD,
condenser water pump and the chilled water
pump. Open the disconnect on the side of the
Power Panel to disconnect the storage battery.
Ensure the control center is powered off.

RESTART AFTER PROLONGED SHUTDOWN

The chiller has a start inhibit limit for storage battery
minimum voltage below 12.8 VDC when charging.
Ensure the chiller has line power and battery discon-
nect restored at least eight hours prior to first planned
startup to charge the battery.
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