035-19569-101 (0109)
7-1
GB
7 MAINTENANCE
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
maintenance checks by the operator/customer, backed
up by regular service inspection and maintenance visits
by a suitably qualifi ed 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 York International
service organisation 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.
NOTE
This maintenance section applies to the basic
unit only and may, on individual contracts, be
supplemented by additional requirements to
cover any modifi cations or ancillary equipment
as applicable.
WARNING
The Safety Section of this manual should
be read carefully before attempting any
maintenance operations on the unit. This
section should be read in conjunction with the
MBCS Manual.
7.1 Inspections
7.1.1 Scheduled Maintenance
The maintenance operations detailed in the following
paragraphs should be carried out on a regular basis
by a suitably qualifi ed Service Engineer. It should be
noted that the interval necessary between each ‘minor’
and ‘major’ service 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 recommended that your local York Service
Centre is contacted for recommendations for individual
sites.
7.1.2 Daily
1. Check graphic control centre (OptiView) displays.
2. If the compressor is in operation, check the bearing
oil pressure on the SYSTEM Screen. Also check the
oil level in the oil reservoir. Operating oil level should
be between the upper and lower sight glasses. Drain
or add oil if necessary.
3. Check entering and leaving condenser water
pressure and temperatures are correct for design
conditions on the SYSTEM Screen.
4. Check the entering and leaving chilled liquid
temperatures and evaporator pressure are correct
for design conditions on the SYSTEM Screen.
5. Check the condenser saturation temperature (based
upon condenser pressure sensed by the condenser
transducer) on the SYSTEM Screen.
6. Check the compressor discharge temperature on the
SYSTEM Screen. During normal operation discharge
temperature should not exceed 104 °C .
7. Check the compressor motor current on the SYSTEM
Screen.
8. Check for any signs of dirty or fouled condenser tubes.
(The temperature difference between condenser
leaving liquid and saturated condensing temperature
should not exceed the difference recorded for a new
unit by more than 2.2°C).
7.1.3 Weekly
1. Check the refrigerant charge (See Refrigerant
Charge Checking).
7.1.4 Every 3 Months
1. Perform chemical analysis of oil.
2. The unit should be leak tested. Any leaks found must
be repaired immediately.
7.1.5 Every 6 Months
(or more often as required)
1. Change and inspect compressor oil fi lter element.
2. Oil return system:
a. Change dehydrator or earlier if the oil return system
fails to operate.
b. Check nozzle of eductor for foreign particles.
3. Check controls and safety cutouts.
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