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Maintenance
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 en-
ter into a maintenance agreement with a York Interna-
tional 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 satisfactory 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
Section.
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
76
SECTION 8
MAINTENANCE
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 exchang-
ers, compressors and pipework for damage and gas
leaks.
Operating Conditions: Read the operating pressures
and temperatures at the control panel using the display
keys and check that these are within the operating limi-
tations 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 between the upper and lower sight glasses
on the oil separators.
Refrigerant Charge: When a system starts up, or
sometimes 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 'ma-
jor' service can vary depending on, for instance, appli-
cation, 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.
FORM 201.25-NM1 (302)
YORK INTERNATIONAL
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