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171
JOHNSON CONTROLS
FORM 201.18-NM7
GENERAL REQUIREMENTS
The units have been designed to operate continuously
provided they are regularly maintained and operated
within the limitations given in this manual. Each unit
should be included in a routine schedule of daily main-
tenance checks by the operator/customer, backed up by
regular service inspection and maintenance visits by a
suitably qualified Service Engineer.
It is entirely the responsibility of the owner to provide
for these regular maintenance requirements and/or enter
into a maintenance agreement with a York International
service organization to protect the operation of the unit.
If damage or a system failure occurs due to improper
maintenance during the warranty period, YORK shall
not be liable for costs incurred to return the unit to sat-
isfactory condition.
This maintenance section applies to
the basic unit only and may, on indi‑
vidual contracts, be supplemented by
additional requirements to cover any
modifications or ancillary equipment
as applicable.
The Safety Section of this manual
should be read carefully before at‑
tempting any maintenance operations
on the unit. This section should be
read in conjunction with the MBCS
Manual.
Daily Maintenance
The following maintenance checks should be carried
out on a daily basis by the operator/customer. Please
note that the units are not generally user serviceable
and no attempt should be made to rectify faults or prob-
lems found during daily checks unless competent and
equipped to do so. If in any doubt, contact your local
YORK Service Agent.
Unit Status : Press the ‘STATUS’ key on the keypad
and ensure no fault messages are displayed (refer to
the MBCS Manual for explanation of messages and the
Trouble Shooting section for courses of action).
Refrigerant Leaks
: Visually check the heat exchangers,
compressors and pipework for damage and gas leaks.
Airflow obstructions : Check the air cooled condenser
coil intakes and adjacent areas are clear of foreign ma-
terials or obstructions e.g. paper, leaves, etc.
Operating conditions : Read the operating pressures and
temperatures at the control panel using the display keys
and check that these are within the operating limitations
given in the MBCS Manual.
Compressor oil level : Check the compressor oil level
after the compressor has been operating on ‘FULL
LOAD’ for approximately half an hour. The oil level
should be about half way up the upper of the two sight
glasses. When the compressor is operating at ‘PART
LOAD’, the level may fall as far as half way down the
lower sight glass but should not fall below this level.
When the compressor returns to full load the level will
return to the upper sight glass.
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.
Scheduled Maintenance
The maintenance operations detailed in the following
table should be carried out on a regular basis by a suit-
ably qualified Service Engineer. It should be noted that
the interval necessary between each ‘minor’ and ‘major’
service can vary depending on, for instance, applica-
tion, 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.
Chiller / Compressor Operating Log
A Chiller/Compressor Operating Log is supplied on
the following page for logging compressor and chiller
operating data.
MAINTENANCE
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