"L" Type POE oil. Always add oil from a new unopened container. Dispose of the remaining oil using environ- mentally friendly procedures.
Refrigerant charge: When a system starts up, or some- times after a change of capacity, a flow of bubbles will be seen in the liquid line sight glass. After a few minutes of stable operation, the bubbles should clear, leaving just liquid refrigerant showing in the sight glass.
Chiller / Compressor Operating Log
A Chiller/Compressor Operating Log is supplied on the following page for logging compressor and chiller operating data.
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,
Scheduled Maintenance
The maintenance operations detailed in the table follow- ing the Operating Log Form should be carried out on a regular basis by a suitably qualified Service Engineer. It should be noted that the interval necessary between each ‘minor’and ‘major’service can vary depending on, for instance, application, site conditions and expected operating schedule. Normally a ‘minor’ service should be carried out every three to six months and a ‘major’ service once a year. It is recommended that your local YORK Service Center is contacted for recommendations for individual sites.
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
FORM
The unit evaporator heater is 120VAC. Disconnecting 120VAC power from the unit, at or below freezing temperatures, can result in damage to the evapora- tor 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, refrigeration leaks, unusual noises, etc. should be investigated and corrected immediately.
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YORK INTERNATIONAL | 195 |
