FORM NO.:6U6K-B01E-NB-EN
JOHNSON CONTROLS
124
SECTION 11 – 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 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 unit.
COMPRESSORS
Oil Charge
The oil used in these compressors is pale yellow in color
(PVE and POE oils). If one of the compressors in a refrigerant
system fails to rotate and a replacement is needed, it is strongly
recommended to clean the system and refill the oil. Examine
the oil color during the process. If the oil darkens or exhibits a
change in color, this may be an indication of contaminants in
the refrigerant system.
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 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 performed 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.
CONDENSER FAN MOTORS
Condenser fan motors are permanently lubricated and require
no maintenance.
BPHE (EVAPORATOR) HEATER
The Brazed Plate Heat Exchanger (evaporator)
heater is 230VAC. Disconnecting 230VAC 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.
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, isolators, etc.
should be investigated and corrected immediately.
EXPANSION TANK
Unless otherwise stated, at least once every year the expansion
tank must be checked to verify that the pre-charge is within the
value indicated on the label with a tolerance of ± 20%.
PRESSURE RELIEF VALVES
The Dual Pressure Relief Valves are standard for each system.
A shut off valve is installed to allow individual valves to
be removed for testing or calibrating as required by local
regulations. The locations of the valves are indicated in Figure
47, 48 and 49.
SECTION 11 – MAINTENANCE
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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