Huawei NetCol5000-C Series User Manual page 117

NetCol5000-C(065, 080) In-row Chilled Water Smart
Cooling Product
User Manual
Alarm Alarm Name
ID
a003 Return air low
temperature
alarm
a004 Return air 2
humidity
invalid
a007 Return air 2
Issue 07 (2020-03-16)
Alarm Impact
Severity
Warning Generates an
alarm
Major Generates an
alarm
Major Generates an
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Possible Cause
alarm threshold is
inappropriate.
5. The value detected
by the temperature
sensor or temperature
and humidity sensor is
different from the
actual value.
6. The chilled water
flow is insufficient, or
the supply water
temperature is high.
7. The chilled water
valve is stuck or faulty.
1. The temperature
sensors or temperature
and humidity sensors
are located in
inappropriate positions.
2. The thermal load
power is low.
3. The ambient
temperature is below
the lower threshold.
4. The low temperature
alarm threshold is
inappropriate.
5. The value detected
by the temperature
sensor or temperature
and humidity sensor is
different from the
actual value.
6. The air filters are
blocked.
7. The chilled water
valve is stuck or faulty.
1. The cables to the
temperature and
humidity sensor are
loose or damaged.
2. The temperature and
humidity sensor is
faulty.
1. The cables to the
Solution
long time after startup.
4. Adjust the high
temperature alarm
threshold.
5. Calibrate or replace
the temperature sensor
or temperature and
humidity sensor.
6. Check the pressure
and temperature of
chilled water.
7. Maintain or replace
the chilled water
valve.
1. Adjust the positions
of the temperature
sensors or temperature
and humidity sensors.
2. Contact Huawei
technical support.
3. Measure the
ambient temperature.
Check whether other
causes exist if the
alarm persists in a
long time after startup.
4. Adjust the low
temperature alarm
threshold.
5. Calibrate or replace
the temperature sensor
or temperature and
humidity sensor.
6. Maintain or replace
the air filters.
7. Maintain or replace
the chilled water
valve.
1. Check the cables to
the temperature and
humidity sensor.
2. Maintain or replace
the temperature and
humidity sensor.
1. Check the cables to
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