York YCAL Series - SECTION 10 - MAINTENANCE; IMPORTANT; COMPRESSORS; CONDENSER FAN MOTORS

FORM 150.66-NM3
ISSUE DATE: 09/25/2020
157
JOHNSON CONTROLS
10
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 aect 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. 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 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.
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.
Exercise care when cleaning the coil so
that the coil ns 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 installed when the 128K bram
is installed.
Do not confuse JP1 on the IPU II
(03102630) board with JP1 on the I/O
(03102550) board.
PLATE AND FRAME HEAT EXCHANGER
(EVAPORATOR) HEATER
The Plate and Frame Heat Exchanger
(evaporator) heater is 120 VAC. Dis-
connecting 120 VAC power from the
unit, at or below freezing temperatures,
can result in damage to the evaporator
and unit as a result of the chilled liquid
freezing.
SECTION 10 - MAINTENANCE