York YLPA 0115SE, Installation, Operation And Maintenance Manual

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67
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
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
maintenance 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 Johnson Controls
Service Organization 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 modifications 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 Unit Operation 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
problems found during daily checks unless competent
and equipped to do so. If in any doubt, contact your local
Johnson Controls Service Center.
Unit status: Press the STATUS key on the keypad
to ensure no fault messages are displayed. (refer to
the Operating Instruction 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 Operating Instructions Manual.
Refrigerant leaks: Visually check the heat exchanger,
ambient coils, compressors and pipework for damage
and gas leaks.
Ambient Coil Fan Motors: The fan motors are
permanently lubricated and require no maintenance.
Airflow obstructions
: Check that the ambient coil air
intakes and adjacent areas are clear of foreign materials
or obstructions e.g. paper, leaves, etc.
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 color. If the oil color darkens or
exhibits a change in color, this may be an indication of
contaminants in the refrigerant system. If this occurs, an
oil sample should be taken and analyzed. 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 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.
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.