JOHNSON CONTROLS
159
Form 150.63-NM9
Issue date: 5/20/2021
10
Section 10 – Maintenance
It is the responsibility of the equipment owner to pro-
vide maintenance on the system.
Important
If system failure occurs due to improbeforemainte-
nance during the warranty period, Johnson Controls
will not be liable for costs incurred to return the system
to satisfactory operation. The following is intended
only as a guide and covers only the 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 unit.
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. Note: at shutdown, the oil level
can fall to the bottom limit of the oil sight glass. Use
YORK “V” oil when adding 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, the system must be cleaned to prevent
compressor failure.
Never use the scroll compressor to pump
the refrigerant system down into a vacuum.
Doing so will cause internal arcing of the
compressor motor which will result in fail-
ure of compressor.
Condenser fan motors
Condenser fan motors are permanently lubricated and
require no maintenance.
Condenser coils
Dirt should not be allowed to accumulate on the con-
denser coil surfaces. Cleaning should be as often as
necessary to keep coils clean.
Exercise care when cleaning the coil so
that the coil fins are not damaged.
Operating parameters
Regular checks of the system should be preformed to
ensure that operating temperatures and pressures are
within limitations, and that the operating controls are
set within probeforelimits.
See the Operation, Start-
Up, and Installation sections of this manual.
Onboard battery back-up
U5 is the Real Time Clock chip located on the 031-
02630 IPU II board that maintains the date/time and
stores customer programmed setpoints. The Real Time
Clock is a 128K bram, P/N 031-02565-000. The IPU
II board must have JP1 installed when the 128K bram
is installed.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.
Overall unit inspection
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure probeforeequipment operation. Items such
as loose hardware, component operation, refrigerant
leaks, unusual noises, etc. should be investigated and
corrected immediately.
Summary of Contents for YCUL0020
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