2200M4JE-HO-iS2-N_2014.04.
Chapter 6 Troubleshooting
Screw Compressor i-series
6-3
Symptom
Direct cause
Root cause
Action
05
Abnormally
high
pressure
(Abnormal
discharge
pressure)
Heat exchange
failure in condenser
(heat exchanger)
Heat transmission
tubes and/or fins
are contaminated
or blocked.
Clean and wash.
Depending on the contamination
level, use chemical cleaning.
Failure or water
dripping in fan
motor, thermo
switch, water
spraying pipes,
cooling water
pumps, etc.
Identify defective devices,
investigate causes of failure and
take necessary actions.
Then, replace failed device(s).
Faulty adjustment
of cooling
water/brine flow
In case of manually adjusted
valve, readjust the valve.
When an automatic control valve
(including wax valve) is used,
investigate the cause and take
necessary actions.
Other causes of
insufficient flow of
cooling water, etc.
Inspect filters installed on the
circulation route for clogging and
contamination, and take
necessary actions.
Inspect for leaks in circulation
routes, and take necessary
actions.
Inspect water supply
routes/mechanisms, and take
necessary actions.
If frozen, take measures such as
improvement of heat insulation or
increase of temperature.
Deficiency in heat
exchanger
performance
If the symptom is caused by
change in operating conditions,
re-examine the conditions for
improvement.
If the symptom is caused by
change in installation
environment, improve the
environment if possible.
In either case, if improvement
measure is difficult to be made,
add more heat exchangers or
increase their sizes.
Non-condensable
gases mixed into
the system
Leak on low
pressure side
* There are also
cases where the
symptom was
caused by
corrosion in
suction
temperature
gauge protection
tube of the
compressor.
Perform a leak check, and take
necessary measures.
Air-purge the heat exchanger.
