Need for maintenance or service
If the system is malfunctioning in any manner or the unit is stopped by one of the safety controls,
consult Table 1 of this manual. After consulting this chart, if you are unable to make the proper
repairs or adjustments to start the compressor or the particular trouble continues to hinder the
performance of the unit, please call the nearest Johnson Controls District Office. Failure to report
constant troubles could damage the unit and increase the cost of repairs.
Stopping the system
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 Manual (160.76-O2).
To stop the chiller, proceed as follows:
1. Push the soft shutdown key on the homescreen on the OptiView panel or rapid stop with
the COMPRESSOR STOP/RESET switch. The compressor stops automatically. The oil pump
continues to run for coastdown period. The oil pump then stops automatically.
2. Stop the chilled water pump (if not wired into the Microcomputer Control Center, in which
case it shuts 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 used.
4. The compressor sump oil heater is energized when the unit is stopped.
Prolonged shutdown
If the chiller is to be shut down for an extended period of time (for example, over the winter
season), the following paragraphs outline the procedure to 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 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, condenser, condenser pump, and the chilled water system-
chilled water pump and coils. Open the drains on the evaporator and condenser liquid heads
to ensure complete drainage. If a Variable Speed Drive, drain its cooling system. If Solid State
Starter equipped drain liquid from 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 V circuit to the Control Center.
Model YK (Style H), R-134a and R-513A16
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