Section 10 - Maintenance; Compressors; Condenser Fan Motors; Condenser Mchx Cleaning - York YLAA0041 Manual

FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
It is the responsibility of the equipment owner to per-
form maintenance on the system.
Important
If system failure occurs due to improper 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 furnished by Johnson Controls.
System components should be maintained according to
the individual manufacture's recommendations as their
operation will affect 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 should 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 will cause internal arcing
of the compressor motor which will result
in failure of compressor.
JOHNSON CONTROLS
SECTION 10 – MAINTENANCE

CONDENSER FAN MOTORS

Condenser fan motors are permanently lubricated and
require no maintenance.
Condenser MCHX
Dirt should 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 fins are not damaged.
MICROCHANNEL COIL CLEANING
Regular cleaning is an essential part of maintaining
the integrity and heat transfer properties of heat ex-
changers. Failure to follow cleaning guidelines can re-
sult in heat exchanger damage, including leaks or loss
of performance. 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 mi-
crochannel heat exchangers minimize the restriction
of cleaning 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 pro-
tective coatings. The following care points must be
followed during cleaning:
• DO NOT use high pressure water, such as a pres-
sure washer, to clean the coils. High pressure wa-
ter can damage the fins 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.
The required cleaning procedure is different depend-
ing on the type of coil and protective coating supplied
with the coil. This section describes the proper proce-
dures to maintain the integrity of each type of coil.
10
199