Section 10 – Maintenance - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017
It is the responsibility of the equipment owner to pro-
vide maintenance on the system.
IMPORTANT
If system failure occurs due to improper maintenance
during the warranty period, Johnson Controls will not
be liable for costs incurred to return the system to sat-
isfactory operation. The following is intended only as
a guide and covers only the chiller unit components. It
does not cover other related system components which
may or may not be furnished by YORK. System com-
ponents should be maintained according to the individ-
ual manufacture's recommendations as their operation
will affect the operation of the chiller.
COMPRESSORS
Oil Level Check
The oil level can only be tested when the compressor
is running in stabilized conditions, to ensure that there
is no liquid refrigerant in the lower shell of the com-
pressor. When the compressor is running at stabilized
conditions, the oil level must be between 1/4 and 3/4 in
the oil sight glass.
At shutdown, the oil level can fall to
the bottom limit of the oil sight glass.
Use YORK "V" oil when adding oil.
Oil Analysis
The oil used in these compressors is pale yellow in
color (POE oil). If the oil color darkens or exhibits a
change in color, this may be an indication of contami-
nants in the refrigerant system. If this occurs, an oil
sample should be taken and analyzed. If contaminants
are present, the system must be cleaned to prevent
compressor failure.
Never use the scroll compressor to
pump the refrigerant system down
into a vacuum. Doing so will cause
internal arcing of the compressor
motor which will result in failure of
compressor.
JOHNSON CONTROLS
SECTION 10 – MAINTENANCE
CONDENSER FAN MOTORS
Condenser fan motors are permanently lubricated and
require no maintenance.
CONDENSER COILS
Dirt should not be allowed to accumulate on the con-
denser coil surfaces. Cleaning should be as often as
necessary to keep coils clean.
OPERATING PARAMETERS
Regular checks of the system should be preformed to
ensure that operating temperatures and pressures are
within limitations, and that the operating controls are
set within proper limits. Refer to the Operation, Start-
Up, and Installation sections of this manual.
ON-BOARD BATTERY BACK-UP
The Real Time Clock chip (U5) is located on the 031-
02630 IPU II board that maintains the date/time and
stores customer programmed setpoints. The Real Time
Clock is a 128K bram, P/N 031-02565-000. The IPU
II board must have JP1 installed when the 128K bram
is installed.
PLATE AND FRAME HEAT EXCHANGER
(EVAPORATOR) HEATER
Exercise care when cleaning the coil
so that the coil fins are not damaged.
Do not confuse JP1 on the IPU II
(031-02630) board with JP1 on the
I/O (031-02550) board.
The Plate and Frame Heat Exchang-
er (evaporator) heater is 120VAC.
Disconnecting 120VAC power from
the unit, at or below freezing tem-
peratures, can result in damage to the
evaporator and unit as a result of the
chilled liquid freezing.
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