FORM 150.66-NM2
ISSUE DATE: 09/25/2020
155
JOHNSON CONTROLS
10
SECTION 10 - MAINTENANCE
It is the responsibility of the equipment owner to provide
maintenance on the system.
IMPORTANT
If system failure occurs due to improper maintenance
during the warranty period, YORK will not be liable
for costs incurred to return the system to satisfactory
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 components should be
maintained according to the individual 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 compressor.
When the compressor is running at stabilized conditions,
the oil level must be between 1/4 and 3/4 in the oil sight
glass. Note: at shutdown, the oil level can fall to the
bottom limit of the oil sight glass. Use YORK “F” oil
when adding oil.
Oil Analysis
The oil used in these compressors is pale yellow in color
(mineral oil). If the oil color darkens or exhibits a change
in color, this may be an indication of contaminants 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.
CONDENSER FAN MOTORS
Condenser fan motors are permanently lubricated and
require no maintenance.
CONDENSER COILS
Dirt should not be allowed to accumulate on the
condenser coil surfaces. Cleaning should be as often as
necessary to keep coils clean.
Exercise care when cleaning the coil
so that the coil fins are not damaged.
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
U5 is the Real Time Clock chip 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 removed when the 128K bram
is installed.
Do not confuse JP1 on the IPU II
(03102630) board with JP1 on the I/O
(03102550) board.
PLATE AND FRAME HEAT EXCHANGER
(EVAPORATOR) HEATER
The Plate and Frame Heat Exchang
er (evaporator) heater is 120 VAC.
Disconnecting 120 VAC 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.
Summary of Contents for YCAL0012EC
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