Quantech QWC4, Installation Operation & Maintenance, Page: 147 / 156

QUANTECH
147
FORM QWC4-NM1 (221)
ISSUE DATE: 02/28/2021
8
SECTION 8 - TROUBLESHOOTING
Successful troubleshooting requires an organized ap-
proach to define the problem, identify the cause, and
make the proper corrections. Sometimes two relatively
obvious problems combine to provide a set of symp-
toms that can mislead the troubleshooter. Be aware of
this possibility and avoid repairs that do not solve the
problems. See Table 46 on page 148 for specific trou-
bleshooting information.
ABNORMAL OPERATION, ANALYSIS AND
CORRECTION
Use the following steps to analyze an operational prob-
lem effectively and make the necessary corrections:
1. Define the problem and its limits.
2. Identify all possible causes.
3. Test each cause until the source of the problem is
found.
4. Make the necessary corrections.
When an operating problem develops, compare all op-
erating information on the OPERATING DISPLAY
key with normal operating conditions. If an operating
log has been maintained, the log can help determine
what constitutes normal operation for the compressor
unit in that particular system.
TROUBLESHOOTING THE COMPRESSOR
AND OIL SEPARATION SYSTEM
Troubleshooting the compressor is limited to iden-
tifying the probable cause. If a mechanical problem
is suspected, contact the Quantech Field Service
Office. DO NOT DISASSEMBLE THE COM-
PRESSOR.
The VSD contains voltages that could
cause injury or death. Follow all NFPA-
70E safety rules. Before performing any
troubleshooting procedures, place the
compressor switch in the stop position.
Wait 5 minutes. Ensure that the DC BUS
voltage is 50 VDC or less on the display
of the chiller control panel.
This equipment is a relatively complicated apparatus.
During rigging, installation, operation, maintenance,
or service, individuals may be exposed to certain com-
ponents or conditions including, but not limited to:
heavy objects, refrigerants, materials under pressure,
rotating components, and both high and low voltage.
Each of these items has the potential , if misused or
handled improperly, to cause bodily injury or death. It
is the obligation and responsibility of rigging, installa-
tion , and operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure
to comply with any of these requirements could result
in serious damage to the equipment and the property in
which it is situated, as well as severe personal injury or
death to themselves and people at the site.