YORK INTERNATIONAL
122
FORM 150.62-NM7 (103)
MAINTENANCE
It is the responsibility of the equipment owner to pro vide
maintenance on the system.
IMPORTANT
If system failure occurs due to improper main te nance
during the warranty period, YORK will not be liable for
costs incurred to return the system to satisfactory op-
er a tion. The fol low ing is intended only as a guide and
covers only the chiller unit components. It does not cov er
other related system components which may or may not
be fur nished by YORK. System com po nents should be
maintained ac cord ing to the individual man u fac ture’s
rec om men da tions as their operation will affect the op-
er a tion of the chiller.
COMPRESSORS
Oil Level check
The oil level can only be tested when the com pres sor
is running in stabilized conditions, to ensure that there
is no liquid refrigerant in the lower shell of the com-
pres sor. When the compressor is running at stabilized
con di tions, the oil level must be be tween 1/4 and 3/4 in
the oil sight glass. Note: at shut down, the oil level can
fall to the bot tom limit of the oil sight glass. Use YORK
“F” oil when add ing oil.
Oil Analysis
The oil used in these compressors is pale yellow in col or
(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 com pres sor
failure.
Never use the scroll com pres sor to
pump the re frig er ant system down into
a vac u um. Doing so will cause in ter nal
arcing of the compressor motor which
will result in fail ure of com pres sor.
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-
dens er coil surfaces. Cleaning should be as often as
nec es sary to keep coil clean.
Exercise care when cleaning the coil
so that the coil fi ns are not damaged.
OPERATING PARAMETERS
Regular checks of the system should be pre formed to
ensure that operating temperatures and pressures are
within limitations, and that the operating con trols are set
within proper limits. Refer to the Operation, Start-Up,
and Installation sections of this manual.
ON-BOARD BATTERY BACK-UP
U17 is the Real Time Clock chip that maintains the date/
time and stores customer programmed setpoints. Any-
time the chiller is to be off (no power to the microboard)
for an ex tend ed time (weeks/months), the clock should
be turned off to conserve power of the on-board bat tery.
To ac com plish this, the J11 jumper on the mi cro board
must be moved to the “CLKOFF” position while pow er
is still sup plied to the microboard.
The unit evaporator heater is 120VAC.
Disconnecting 120VAC power from
the unit, at or below freezing tem-
per a tures, can result in damage to
the evap o ra tor and unit as a result of
the chilled liquid freezing.
OVERALL UNIT INSPECTION
In addition to the checks listed on this page, pe ri od ic
overall inspections of the unit should be ac com plished
to ensure proper equipment operation. Items such as
loose hardware, component operation, re frig er ant leaks,
un usu al nois es, etc. should be investigated and cor-
rect ed im me di ate ly.
Service and Trou ble shoot ing
To Next Page
Loading...
