289
JOHNSON CONTROLS
FORM 201.21-NM4 (616)
289
JOHNSON CONTROLS
9
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 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.
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 .
Refrigerant Leaks
Visually check the heat exchangers, 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 limitations given in the
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 ‘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 Page
301 for logging compressor and chiller operating data.
