JOHNSON CONTROLS
161
FORM 150.73-NM1
ISSUE DATE: 07/03/2024
10
Section 10: Maintenance
It is the responsibility of the equipment owner to per-
form maintenance on the system.
Important
If system failure occurs due to incorrect maintenance
during the warranty period, Johnson Controls will not
be liable for costs incurred to return the system to sat-
isfactory operation. The following is intended only as
a guide and covers only the chiller unit components. It
does not cover other related system components which
may or may not be provided by Johnson Controls. Sys-
tem components must be maintained according to the
individual manufacture’s recommendations as their
operation affects the operation of the chiller.
Compressors oil level check
The oil level can only be tested when the compressor
is running in stabilized conditions, to ensure that there
is no liquid refrigerant in the lower shell of the com-
pressor. When the compressor is running at stabilized
conditions, the oil level must be between 1/4 and 3/4 in
the oil sight glass. At shutdown, it is acceptable if the
oil level falls to the bottom limit of the oil sight glass.
Use YORK “V” oil 011-00949-000, when
adding oil to Copeland compressor. The
Bitzer compressor uses 011-00982-000 oil.
Oil analysis
The oil used in these compressors is pale yellow in
color (POE oil). If the oil color darkens or exhibits a
change in color, this may be an indication of contami-
nants in the refrigerant system. If this occurs, an oil
sample must be taken and analyzed. If contaminants
are present, clean the system to prevent compressor
failure.
Never use the scroll compressor to pump
the refrigerant system down into a vacu-
um. Doing so causes internal arcing of
the compressor motor which will result
in failure of compressor.
Condenser fan motors
Condenser fan motors are permanently lubricated and
require no maintenance.
Condenser MCHX
Dirt must not be allowed to accumulate on the MCHX
condenser surfaces. Cleaning should be as often as
necessary to keep coils clean.
Exercise care when cleaning the MCHX
so that the ns are not damaged.
Microchannel coil cleaning
Regular cleaning is an essential part of maintaining the
integrity and heat transfer properties of heat exchang-
ers. Failure to follow cleaning guidelines can result in
heat exchanger damage, including leaks or loss of per-
formance. The cleaning procedures described in this
document are required to maintain the warranty of the
condenser coils.
Microchannel coils tend to accumulate less dirt inside
the coils than on the surface, which makes them easier
to clean than conventional round tube and fin coils.The
reduced depth and parallel tube layout of microchan-
nel heat exchangers minimize the restriction of clean-
ing water through the heat exchanger. This provides
a shorter and more direct path for cleaning water to
effectively carry away dirt and debris during regular
maintenance. During the cleaning process, take care to
avoid damage to the coils and the protective coatings.
The following care points must be followed during
cleaning:
• Do not use high pressure water, such as a pressure
washer, to clean the coils. High pressure water can
damage the ns and the protective coatings on the
coil.
• Do not contact the coil with a hard object such as
a hose nozzle, hard vacuum nozzle or any other
tool. Hard objects or tools can cause mechanical
damage to the coil material and protective coat-
ings on the coil.
• Do not use caustic or acidic cleaning solutions on
the coils. Only use cleaning solutions approved by
Johnson Controls.
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