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Form QCC2-NM1
Issue Date: 5/20/2021
It is the responsibility of the equipment owner to pro-
vide maintenance on the system.
Important
If system failure occurs due to incorrect maintenance
during the warranty period, Quantech 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 Quantech. System components
should be maintained according to the individual man-
ufacture's recommendations as their operation will af-
fect 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.
QUANTECH
Section 10 – Maintenance
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.
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 correct limits. Refer to the Operation, Start-
Up, and Installation sections of this manual.
Onboard battery backup
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.
Overall unit inspection
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure correct equipment operation. Items such
as loose hardware, component operation, refrigerant
leaks, unusual noises, etc. should be investigated and
corrected immediately.
Exercise care when cleaning the coil so
that the coil fins are not damaged.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.
10
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Troubleshooting
