Huawei NetCol5000-C User Manual page 116

NetCol5000-C Chilled Water-Cooled In-Row Precision
Air Conditioner
User Manual
Alarm
Alarm Name
ID
a052 Supply-air
temp invalid
a077 Indoor fan
1/2/3/4/5/6/7/
8 failure
a078 Full water
Drain
a079
abnormal
Issue 02 (2013-12-10)
System
Severity
Operation
valve and
actuator has
100% outputs
in automatic
running mode.
Major The alarm is
generated.
Major The alarm is
generated.
Critical The alarm is
generated, and
the
NetCol5000-C
shuts down.
The alarm is
Major
generated.
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Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Possible Causes
displayed on the LCD
is different from the
actual temperature.
3. The chilled water
flow is insufficient,
or the supply water
temperature is high.
4. The chilled water
valve is faulty.
5. The cooling capacity
of the NetCol5000-C
is insufficient due to
high load.
1. The temperature
sensor at supply-air
vent is faulty.
2. Cables to the
temperature sensor at
supply air vent are
loose or damaged.
1. The power supply to
the indoor fans is
abnormal.
2. Cables to indoor fan
are loose or damaged.
3. Indoor fan is faulty.
1. The high float is
faulty or stuck.
2. The condensate pump
is faulty, or the
drainage capacity of
the condensate pump
decreases.
3. The drainpipe of the
condensate pump is
blocked.
1. The low float is
faulty or stuck.
2. The high float is
faulty or stuck.
3. Cables to the high or
low float are loose or
damaged.
4. The condensate pump
is faulty, or the
drainage capacity of
the condensate pump
decreases.
Recovery Measures
humidity sensor.
3. Check the pressure
and temperature of
the supplied chilled
water.
4. Maintain or replace
the chilled water
valve.
5. Add more
NetCol5000-C units.
1. Maintain or replace
the temperature
sensor at supply-air
vent.
2. Check cables to the
temperature sensor
at supply-air vent.
1. Check the power
supply to the indoor
fans.
2. Check cables to
indoor fan.
3. Maintain or replace
indoor fan.
1. Replace the high
float or clear the
obstacles.
2. Replace the
condensate pump.
3. Clear obstacles in
the drainpipe.
1. Maintain or replace
the low float or clear
the obstacles.
2. Maintain or replace
the high float or
clear the obstacles.
3. Check cables to the
faulty float.
4. Maintain or replace
the condensate
pump.
5. Clear obstacles in
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