Johnson Controls York OptiView YK G Series, Эксплуатация и обслуживание

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unit, call the nearest Johnson Controls District Office. Failure to report persistant trouble could
damage the unit and increase the cost of repairs.
Stopping the system
About this task:
The OptiView™ control center can be programmed to start and stop automatically (maximum, once
each day) whenever desired. Refer to the OptiView™ Control Center – Operation and Maintenance
(Form 160.54-O1) . To stop the chiller, proceed as follows:
1. Push the soft shutdown key on the Home Screen on the OptiView™ panel or rapid stop
with the compressor stop/reset switch. The compressor stops automatically. The oil pump
continues to run for the coastdown period. The oil pump then stops automatically.
2. Stop the chilled water pump, if it is not wired into the microcomputer control center, in which
case it will shut off automatically simultaneously with the oil pump. The actual water pump
contact operation is dependent upon the position of microboard jumper J54.
3. Open the switch to the cooling tower fan motors, if they are being used.
4. The compressor sump oil heater is energized when the unit is stopped.
Prolonged shutdown
About this task:
If the chiller is to be shut down for an extended period of time, for example, over the winter season,
complete the following steps:
1. Test all of the 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 system should be checked periodically.
2. If freezing temperatures are encountered while the system is idle, carefully drain the cooling
water from the cooling tower, the condenser, the 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. If a variable speed drive is in use, drain its cooling
system. If equipped with a solid state starter, drain liquid from the starter cooling loop.
3. If freezing temperatures are encountered for periods longer than a few days, the refrigerant
should be recovered to containers to prevent leakage from O-ring joints.
4. On the Setup Screen, disable the clock. This conserves the battery.
5. Open the main disconnect switches to the compressor motor, condenser water pump, and
the chilled water pump. Open the 115 volt circuit to the control center.
Model YK Style G R-134a or R-513A 18