Service and Troubleshooting
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 op- eration. 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 op- eration 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 at 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.
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 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- pressor failure.
Never use the scroll compressor to pump the refrigerant system down into a vacuum. Doing so will cause inter- nal arcing of the compressor motor which will result in failure of compres-
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- denser coil surfaces. Cleaning should be as often as necessary 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.
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 extended time (weeks/months), the clock should be turned off to conserve power of the
THE UNIT EVAPORATOR HEATER IS 120 VAC. DISCONNECTING 120VAC POWER FROM THE UNIT, AT OR BELOW FREEZING TEM- PERATURES, 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 cor- rected immediately.
108 | YORK INTERNATIONAL |
