Huawei NetCol5000-C User Manual page 115

NetCol5000-C Chilled Water-Cooled In-Row Precision
Air Conditioner
User Manual
Alarm
Alarm Name
ID
a049 Supply-air LT
a050 Cold aisle HT
a051 Hot aisle HT
Issue 02 (2013-12-10)
System
Severity
Operation
The alarm is
Warning
generated.
Critical The alarm is
generated. The
indoor fan has
the maximum
output, and the
CW value has
100% outputs
in automatic
running mode.
Critical The alarm is
generated. The
indoor fan has
the maximum
output, and the
electromagnetic
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6 System Operation and Maintenance
Possible Causes
of the NetCol5000-C
is insufficient due to
high load.
7. The ambient
temperature is high.
1. The supply-air low
temperature alarm set
point is inappropriate
for the working
conditions.
2. The temperature
displayed on the LCD
is different from the
actual temperature.
3. Cables to the supply
air temperature
sensor are loose or
damaged.
4. The chilled water
valve is faulty.
5. The ambient
temperature is low.
1. The return-air high
temperature alarm set
point is inappropriate
for the working
conditions.
2. The temperature
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, or the
load is high.
6. The ambient
temperature is high.
1. The high temperature
alarm set point for the
hot aisle is
inappropriate for the
working conditions.
2. The temperature
Recovery Measures
1. Adjust the supply-air
low temperature
alarm set point.
2. Maintain or replace
the supply air
temperature sensor.
3. Check cables to the
supply-air
temperature sensor.
4. Maintain or replace
the chilled water
valve.
5. Check the ambient
temperature.
1. Adjust the return-air
high temperature
alarm set point.
2. Maintain or replace
the temperature and
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.
6. Check the ambient
temperature.
1. Adjust the high
temperature alarm
set point for the hot
aisle.
2. Maintain or replace
the temperature and
107