Chapter 6 Troubleshooting
UD-series Screw Compressors
6-10
Trouble Direct causes Factors Actions
vibration
and/or
noise of
compressor
opening control
cannot keep up with
rapid changes in
heat load on load
Avoid rapid changes in heat load.
exchanger capacity
on load side due to
an insufficient
defrosting.
For frosting (icing), defrost
manually.
Reduce setting of defrosting
interval.
For malfunction of devices specific
to defrosting methods, remove the
cause and replace them.
For blocked piping route specific to
defrosting methods, remove the
cause and take measures.
* Especially for hot gas defrost,
refer to the instruction manual
related to devices/control on load
during operation
exchanger capacity
on load side due to
load side conditions
Improve the environment if cooling
ventilation is blocked by excessive
loads around heater exchanger.
* Make sure to maintain sufficient
air flow for heat exchanger on
exchanger capacity
on load side due to
the failure of heat
Inspect for blockage of heat
exchanger tubes and malfunction of
fans of heat exchanger. If any, take
measures.
entering into
compressor
spatter, etc., from
Inspect suction strainer and oil filter.
If any problems to element, replace
it.
Overhaul compressor.
Collect foreign substances and
objects. Identify the source and take
measures.
collecting tools and
rags during
overhaul
bearing
(exceeded
appropriate time for
replacement)
Appropriate time for replacement
will differ due to operating
conditions (if low pressure or
intermediate pressure is high, life of
thrust bearing becomes shorter)
and oil management conditions.
However, if used under normal
operating conditions based on
steady and continuous operation,
inspect and replace it after 40000
hours or within 5 years. For details,
refer to chapter 5.2.3 in this manual.
operation
Refer to the Direct causes “Liquid
flow-back during startup” and
“Liquid flow-back during operation”
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