Abnormally High Pressure (Abnormal Discharge Pressure) - mycom i125S Instruction Manual

Symptom
05 Abnormally
high
pressure
(Abnormal
discharge
pressure)
Screw Compressor i-series
Direct cause
Heat exchange Heat transmission
failure in condenser tubes and/or fins
(heat exchanger) are contaminated
or blocked.
Failure or water
dripping in fan
motor, thermo
switch, water
spraying pipes,
cooling water
pumps, etc.
Faulty adjustment
of cooling
water/brine flow
Other causes of
insufficient flow of
cooling water, etc.
Deficiency in heat
exchanger
performance
Non-condensable Leak on low
gases mixed into pressure side
the system
Root cause
Clean and wash.
Depending on the contamination
level, use chemical cleaning.
Identify defective device(s),
investigate causes of failure and
take necessary actions.
Then, replace failed device(s).
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.
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.
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.
Perform a leak check, and take
necessary measures.
* There are also Air-purge the heat exchanger.
cases where the
symptom was
caused by
corrosion in
suction
temperature
gauge protection
tube of the
compressor.
6-3
2203M4JE-MY-iS2-N_2017.04.
Chapter 6 Troubleshooting
Action