Huawei NetCol5000-A User Manual page 165

NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
Symptom
The
humidity of
the computer
room is
high, or
condensate
water
generates.
Power
failures
occur on the
active and
standby
routes.
The electric
heater
switch trips
abnormally.
The electric
heater fails.
The
compressor
switch trips
abnormally.
The
crankcase
heater does
not heat.
The
crankcase
Issue 01 (2017-07-27)
Possible Cause
The liquid level detector is faulty.
The inlet pipe and drainpipe leak.
The self-drainpipe is blocked.
The server heat load for each air
conditioner is lower than 5 kW.
1. The input power has an open
phase.
2. The contactor fuse in the active
route is damaged.
3. The interlock contactor and
middle contactor are damaged.
The switch is faulty.
The electric heater contactor is not
closed.
The switch is faulty.
1. The crankcase heater is
disconnected abnormally.
2. The fuse has blown.
3. The crankcase heater is
short-circuited abnormally, and
the fuse has blown.
The relay contacts of the crankcase Replace the crankcase heater relay.
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5 Operation and Maintenance
Solution
Check the alarm. Check cable
connections for high and low liquid
level detectors. Check whether the
liquid level detectors are damaged. If
necessary, replace the liquid level
detectors.
Check the inlet pipe and drainpipe
and the connectors. Rectify any
leakage and fasten the connectors.
Check that no blocks and frost in the
self-drainpipe.

Make sure that the doors,
windows, floor, and ceiling of the
datacenter room/container
environment are sealed well.

If the outside environment
humidity is too high, shut down
the fresh air system.

In modular datacenter, open the
modular doors and ceilings, or
open some false panel on the IT
rack.
1. Rectify the power supply fault.
2. Replace the fuse.
3. Replace the interlock contactor
and middle contactor.
Replace the electric heater switch.
Replace the electric heater contactor.
Replace the compressor switch.
1. Replace the crankcase heater.
2. Replace the fuse.
3. Replace the crankcase heater and
the fuse.
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