Huawei NetCol5000-A025 User Manual page 233

NetCol5000-A025 In-row Air Cooled Smart Cooling
Product
User Manual (300 mm Width)
Symptom
The compressor
discharge pressure is too
low.
The compressor suction
pressure is too low.
Liquid returns to the
compressor.
The compressor
generates excessive
noises. (It is common
that the compressor
generates much noise
when it is shutting
down)
Issue 15 (2020-12-10)
Possible Cause
Air exists in the cooling
system.
Heat dissipation is poor
because of blockages in
the condenser.
An outdoor fan fails.
The refrigerant is
insufficient.
The refrigerant is
insufficient.
The outdoor fan speed
controller fails.
The refrigerant leaks.
The refrigerant is
insufficient.
The condensing pressure
is too low.
The indoor temperature
is too low.
The air filter is dirty or
blocked.
The coil of the electronic
expansion valve is faulty.
The external residual
pressure is too high, and
air volume decreases.
Liquid returns in a
compressor.
The refrigerant oil is
insufficient.
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6 System Operation and Maintenance
Solution
Exhaust air, and examine
and repair the pipes.
Clean the condenser fins.
Check whether the
outdoor fan works.
Fill more refrigerant.
Fill more refrigerant.
Replace the fan speed
controller.
Check the pipes for
leaks.
Fill more refrigerant.
Check whether the
outdoor temperature is
too low and whether the
outdoor fan is under
control.
Change the temperature
setting.
Replace the air filter.
Replace the electronic
expansion valve coil.
Check whether the air
channel is blocked.
Check whether the oil
temperature and
discharge temperature
are within the normal
range (70–100°C)
Add refrigerant oil.
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