Need For Maintenance Or Service; Stopping The System; Prolonged Shutdown - York YK Series Operation And Maintenance

FORM 160.76-O1
ISSUE DATE: 6/15/2015
Annually (more often if necessary)
1. Drain and replace the oil in the compressor oil
sump. (Refer to Oil Charging Procedure on Page
22.)
2. Evaporator and Condenser.
a. Inspect and clean water strainers.
b. Inspect and clean tubes as required.
c. Inspect end sheets.
3. Compressor Drive Motor (See motor manufactur-
ers maintenance and service instruction supplied
with unit)
a. Clean air passages and windings per manu-
facturers instructions.
b. Meg motor windings – Refer to Figure 14 on
Page 28 for details.
c. Lubricate per motor manufacturer recom-
mendations.
4. Inspect and service electrical components as neces-
sary.
5. Perform refrigerant analysis.
If quarterly inspection indicates oil is fine,
replacing the oil is not necessary

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
the Operation Analysis Chart, Table 1 on Page 23 of
this manual. After consulting this chart, if you are un-
able 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 near-
est 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 and Maintenance (Form 160.54-
O1). To stop the chiller, proceed as follows:
JOHNSON CONTROLS
SECTION 2 - SYSTEM OPERATING PROCEDURES
1. Push the soft shutdown key on the homescreen on
the OptiView panel or rapid stop with the COM-
PRESSOR STOP/RESET switch. The compressor
will stop automatically. The oil pump will contin-
ue to run for coastdown period. The oil pump will
then stop automatically.
2. Stop the chilled water pump (if not wired into
the Microcomputer Control Center, in which
case it will shut off automatically simultaneously
with the oil pump.) (The actual water pump con-
tact 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 fol-
lowing 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 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. (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 peri-
ods 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 com-
pressor motor, condenser water pump and the
chilled water pump. Open the 115 volt circuit to
the Control Center.
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