York YCAS0130 - Manual (Page 195)

195 YORK INTERNATIONAL
FORM 201.19-NM1 (204)
9
"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 fl ow of bub bles will
be seen in the liquid line sight glass. After a few min utes
of stable operation, the bubbles should clear, leav ing
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
op er at ing 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, Start-Up,
and Installation sections of this manual.
Scheduled Maintenance
The maintenance operations detailed in the ta ble follow-
ing the Operating Log Form should be carried out on a
regular basis by a suit ably qualifi ed Service Engineer.
It should be noted that the interval necessary between
each ‘minor’ and ‘ma jor’ ser vice can vary depending on,
for instance, ap pli ca tion, site conditions and expected
operating sched ule. Nor mal ly 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 Cen ter is contacted for recommendations
for in di vid u al sites.
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 extended time (weeks/months), the clock should
be turned off to conserve power of the on-board battery.
To accomplish this, the J11 jumper on the microboard
must be moved to the "CLKOFF" position while power
is still supplied to the microboard.
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.