Table of Contents
Advertisement
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 mainte-
nance 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 Inter-
national 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 on the unit.
This section should be read in con-
junction 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.
150
MAINTENANCE
Airflow Obstructions
Check the air cooled condenser coil intakes and adja-
cent areas are clear of foreign materials 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 at 'FULL LOAD' for approximately
10 - 15 minutes. The oil level should be between the
upper half of the bottom sightglass and below the top of
the upper sightglass. When the compressor is operating
at 'PART LOAD', the level may fall as far as half way
down the lower sightglass but should not fall below this
level. When the compressor returns to full load the level
will rise.
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 sightglass. After a few minutes of stable operation,
the bubbles should clear leaving just liquid refrigerant
showing in the sightglass.
SCHEDULED MAINTENANCE
The maintenance operations detailed in the following table
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' ser-
vice 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 recom-
mended that your local YORK Service Center is con-
tacted 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 oper-
ating data.
FORM 150.52-NM2 (1001)
YORK INTERNATIONAL
Hide quick links:
Advertisement
Table of Contents
