York MILLENNIUM YCUL0016SC, Assembly, Installation, Operation & Maintenance

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YORK INTERNATIONAL
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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 nec-
essary to keep coil 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 BACKUP
U17 is the Real Time Clock chip that main-
tains the date/time and stores customer pro-
grammed setpoints. Anytime the chiller is to
be off (no power to the microboard) for an ex-
tended time (weeks/months), the clock should
be turned off to conserve power of the on-board
battery. To accomplish this, the J11 jumper on
the microboard must be moved to the
“CLKOFF” position while power is still sup-
plied to the microboard.
OVERALL UNIT INSPECTION
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigerant leaks,
unusual noises, etc. should be investigated and corrected
immediately.
MAINTENANCE
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, 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 compres-
sor. When the compressor is running in stabilized con-
ditions, 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 to compressor.
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 com-
pressor failure.
Never use the scroll compressor to
pump the refrigerant system down
into a vacuum. Doing so will cause
internal arcing of the compressor mo-
tor which will result in failure of com-
pressor.
Control Service and Troubleshooting