York YLAA0195HE, Manual, Page: 189 / 206

189
JOHNSON CONTROLS
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
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, Johnson Controls 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 Johnson Controls.
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.
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 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 vac -
uum. Doing so will cause internal arcing
of the compressor motor which will re -
sult 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 “Unit Operation ” ,
“ Commissioning ” , 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.
Do not confuse JP1 on the IPU II (031­
02630) board with JP1 on the I/O
(031­02550) board.
PLATE AND FRAME HEAT EXCHANGER
(EVAPORATOR) HEATER
The Plate and Frame Heat Exchanger
(evaporator) heater is 120VAC. Dis -
connecting 120VAC power from the
unit, at or below freezing tempera -
tures, can result in damage to the
evaporator and unit as a result of the
chilled liquid freezing.
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.