FORM QWC3-NM1
ISSUE DATE:11/20/2020
QUANTECH
167
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 improper 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 chiller unit components. It does
not cover other related system components which may
or may not be furnished by Quantech. System compo-
nents 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 visible in the oil sight
glass.
At shutdown, the oil level should be be-
tween the bottom and middle of the oil
sight glass. Models QWC3050 to 0150 use
POE synthetic “V”oil, Models QWC3170
to 200 use “PVE”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.
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 proper limits. See the Operation, Start-Up,
and Installation sections of this manual.
ON-BOARD BATTERY BACK-UP
The Real Time Clock chip (U5) is 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 32K bram
is installed.
Do not confuse JP1 on the IPU II (031-
02630) board with JP1 on the I/O (031-
02550) board.
Jumper provision may not be provided.
OVERALL UNIT INSPECTION
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigerant
leaks, unusual noises, etc. should be investigated and
corrected immediately.
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