mycom SCV Series Instruction Manual page 120

Trouble
Defect in hydraulic
04 Low pressure detection
oil-supply divices.
pressure
05 Abnormal Heat exchange
high failure at condenser
pressure (heat exchanger)
(abnormal
discharge
pressure)
Uncondensed gas
in the system
SCV-series Screw Compressors
Direct causes
Malfunction in
hydraulic pressure
protection
device(switch),
pressure sensor,
relays, etc.
Clogging in the
tubing for oil
pressure protection
switch.
Contaminated and
blocked heat
exchanger tubes,
fins, etc.
Malfunction of fan
motor,
thermo-switch,
water spray bars,
cooling water
pumps, etc.
(including shortage
or out of water)
Flow volume
adjustment failure
of cooling water,
brine, etc.
Other causes of
insufficient
circulation volume
of cooling water,
etc.
Shortage in
capacity of heat
exchanger.
Intake air to low
pressure side
through pinholes,
cracks, corrosions
and other defective
areas.
Factors
Identify malfunctioning devices,
examine their causes, and take
measures.
Then, replace malfunctioning
devices.
Remove clogging. Check oil
contamination level and replace oil
as necessary.
Clean and wash them.
Use solvent to clean depending on
contamination.
Identify malfunctioning devices,
examine their causes, and take
measures.
Then, replace malfunctioning
devices.
If regulating valve is manually
adjusted, readjust it.
If an automatic control valve
(including wax valve) is used,
examine its cause and take
measures.
Inspect for clogging and
contamination of filters for
circulation route filters, and take
measures as needed.
Inspect for leak in circulation routes,
and take measures if any.
Inspect water supply routes and
systems, and take measures as
needed. If frozen, resolve by better
insulation or heating.
If the trouble is caused by change in
operating conditions, re-examine
the conditions to improve.
If the trouble is caused by change in
installation environment, improve
the environment if possible.
For both cases, if it is difficult to
improve, add more heat exchanger
or increase their sizes.
Inspect for leak, and take necessary
measures.
Then, air purge the heat exchanger.
6-3
2205Q2JE-HO-S6-N_2020.01.
Chapter 6 Troubleshooting
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