Huawei NetCol5000-A User Manual page 192

NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm)
Symptom
Compressor generate
excessive noises.
An indoor fan fails to start.
The heating function is
unavailable.
Issue 13 (2019-01-15)
Possible Cause
The superheat degree that is
set with the thermostatic
expansion valve is
inappropriate.
The sensing bulb is
disconnected from the
thermostatic expansion
valve.
The external excess pressure
is too high, and air
decreases.
The condensing pressure is
too low.
Liquid returns in a
compressor.
The lubricant is insufficient.
The transport sheet metal is
not removed from a
compressor.
Either the main circuit
breaker or the indoor fan
circuit breaker is not
switched on.
An indoor fan contactor has
an abnormal pickup.
An indoor fan is damaged.
The electric heater
temperature switch is being
protected.
The electric heater circuit
breaker is off.
An electric heater is burnt
out.
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Solution
Adjust the thermostatic
expansion valve to an
optimal degree.
Check whether the
thermometer bulb is
disconnected from the
thermostatic expansion
valve.
Check whether the air duct
is blocked.
Check the condenser.
Check whether the oil
temperature and exhaust
temperature are within a
normal range.
Add the lubricant.
Remove the sheet metal.
Check the circuit breaker
status.
Check whether the main
control board sends signals
to the indoor fan contactor
and whether the contactor is
damaged.
Replace the indoor fan.
Check whether the
temperature switch is faulty.
Replace the faulty switch.
Check the electric heater
circuit breaker status.
Disconnect the power
supply and check whether
the electric heater is
damaged by checking the
electric heater resistance
properties with an
ohmmeter.
183