2200LZJE-HO-C6-N_2013.12.
Chapter 6 Troubleshooting
Compound 2-stage Screw Compressor 2016**C
6-3
Symptom Direct cause Root cause Action
04 Low oil
pressure
(low
lubrication
oil supply
pressure)
Insufficient oil in oil
separator.
Extensive oil leak Inspect machine room and around
the compressor, and take
necessary actions.
Check if there is oil floating in
cooling water system.
→If there is, check for oil leak from
heat transmission tube of oil cooler
and take necessary actions.
If piping is damaged due to
excessive vibration, take measures
to reduce vibration (including
measures for resonance vibration).
Oil pressure
detection function
is defective.
Failure of oil
pressure protection
device, pressure
sensor, relay, etc.
Identify defective devices,
investigate causes of failure and
take necessary actions.
Then, replace failed device(s).
Pressure pipe is
clogged.
Remove clogging, and check oil for
contamination/replace oil.
05 Intermediate
pressure is
unusually
high.
High suction
pressure
Heat load on load
side is higher than
design value.
Inspect the conditions on load side
(warehousing volume,
opening/closing of doors, etc.), and
take necessary measures.
Malfunction of
suction pressure
adjusting
mechanism
In case of pressure sensing failure,
replace the pressure sensor.
* In some cases, pressure pick-up
position is improper. → Change
the position.
If there is a problem in device(s) on
the control circuit, find the defective
device(s) and replace it.
If parameter (set value) on the
control circuit is improper, optimize
it.
In case of malfunction of pressure
adjustment valve, replace the valve
or remove the cause.
Malfunction of
compressor's
capacity control
See Item No. 11 "Capacity control
malfunction".
Liquid flow-back
from intermediate
liquid cooler.
Failure or internal
leakage of
intermediate liquid
supply expansion
valve
Repair or replace.
There is problem in
compressor's
high-stage.
Malfunction of
capacity control on
compressor's high-
stage
See Item No. 11 "Capacity control
malfunction".
Excessive wear or
sliding damage of
the part(s) on
compressor's high-
stage
Overhaul compressor and replace
parts.
Replace the whole quantity of
lubricant.
06
Unusually
high
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.
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