Huawei NetCol5000-C User Manual page 123

NetCol5000-C Chilled Water-Cooled In-Row Precision
Air Conditioner
User Manual
Symptom
abnormal.
The air return
temperature is high or
the fan rotational speed
is fast. (The temperature
fluctuation exceeds ±
1° C.)
Drainage capacity of the
NetCol5000-C
decreases.
Condensate water exists
on the surfaces of the
front or rear panels.
Issue 02 (2013-12-10)
Possible Causes
water valve is not connected to the
right position.
 The valve plug of the chilled water
valve is reversely installed.
 The chilled water valve is stuck.
 The humidity detected by the
humidity and temperature sensor is
larger than the actual humidity,
which results in anticond
protection being triggered
frequently for the NetCol5000-C.
 The temperature and humidity
thresholds are improper.
 Alarms, such as full water,
in-cabinet overflow, smoke sensor,
and no refrigerant output are
generated.
PID control related parameters are not
set properly.

The drainpipe is bent by a large
angle or trap exists.

The drainage system is faulty. (The
water pump, floats, or drainpipes
are faulty.)
 The operating environment of the
NetCol5000-C is overhumidity.

The temperature threshold is set to
a much smaller value.
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6 System Operation and Maintenance
Troubleshooting
water valve controller. Ensure that the
jumper cap is on the right two pins.
 Check the drainpipes
1. Check that the chilled water valve
plug is correctly installed.
2. Replace the chilled water valve.
3. Check whether the ambient
temperature of the humidity and
temperature sensor is too high.
Ensure that the humidity and
temperature sensor is located at a
proper position. If the position is
proper but the fault persists, replace
the humidity and temperature
sensor.
4. Adjust the temperature and
humidity thresholds.
5. Check the alarm causes and clear
the alarm manually.
Decrease the Kp value by 0.01 and do not
set Kp to a much smaller value. Ensure
that temperature fluctuation is less than
± 1° C.

Check that self-drainpipes are not bent
by a large angle and traps do not exist.
Ensure that the height difference for
drainage is enough.

Check that the floats are working
properly.

Check whether fuses on circuits C and
D are blown. If yes, replace the fuses.

Check whether the relay works
properly. If not, replace the relay.

Check whether the water pump works
properly. If not, replace the water
pump.

Check that the pipes are not bent by a
large angle.

Enhance the airtightness of the
equipment room.
 Enhance the airtightness of the
equipment room.

Adjust the temperature and humidity
thresholds.
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