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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
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 a Johnson Controls
service organisation to protect the operation of the unit.
If damage or a system failure occurs due to improper
maintenance during the warranty period, Johnson
Controls 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 individual contracts, be supplemented by
additional requirements to cover any modifi cations or
ancillary equipment as applicable.
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 Section 7.
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
problems found during daily checks unless competent
and equipped to do so. If in any doubt, contact your local
Johnson Controls Service Centre.
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).
Operating conditions: Read the operating pressures
and temperatures at the control panel using the 'OPER
DATA' key and check that these are within the operating
limitations given in the MBCS Manual.
Refrigerant leaks: Visually check the cooler, condenser,
compressors and pipework for damage and gas leaks.
EN
MAINTENANCE
Compressor oil level: Check the compressor oil level
when the compressor is operating normally. The oil level
should be between the ½ and ¾ in the oil sight glass.
At shutdown the oil level can fall to the lower limit of
the oil sight glass.
Compressor Oil Quality: The oil used in the compressors
is pale in colour. If the oil colour darkens or exhibits
a change in colour, this may be an indication of
contaminants in the refrigerant system. If this occurs, an
oil sample should be taken and analysed. If contaminants
are present, the system must be cleaned to prevent
compressor failure.
Refrigerant Charge: When a system starts up, or
sometimes after a change of capacity, a fl ow 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.
In addition to the checks listed above, periodic
inspections of the unit should be carried out to ensure
proper equipment operation. Items such as loose
equipment, component operation, unusual noises, etc.
should be investigated and corrected immediately.
SCHEDULED MAINTENANCE
The maintenance operations detailed in the following
table 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 Johnson Controls
Service Centre is contacted for recommendations for
individual sites.
FORM 150.27-NM2.EN.CE (0312)
8
47
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