Huawei NetCol8000-E220 User Manual page 131

NetCol8000-E220 Modular Indirect Evaporative Cooling
System
User Manual
Alarm Alarm
ID Severity
A046- MAJOR
01
A048- CRITICA
01 L
Issue 02 (2019-10-10)
Alarm
Probable Cause
Name
4. The expansion valve is blocked
or stuck, or the expansion valve coil
and cable connections are faulty.
5. The indoor fan is faulty.
6. The ambient temperature is
below the lower threshold.
Compressor 2 1. The refrigerant leaks.
antifreeze
2. The pressure displayed is
protection
different from the actual pressure.
alarm
3. The filter dryer is blocked.
4. The expansion valve is blocked
or stuck, or the expansion valve coil
and cable connections are faulty.
5. The indoor fan is faulty.
6. The ambient temperature is
below the lower threshold.
Supply air 1. The temperature sensors or
high temperature and humidity sensors
temperature are located in inappropriate
alarm positions.
2. The thermal load power is high
or the cooling capacity is
insufficient.
3. The ambient temperature exceeds
the upper threshold.
4. The high 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 chilled water flow is
insufficient, or the supply water
temperature is high.
7. The chilled water valve is stuck
or faulty.
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Solution
3. Maintain or replace the filter
dryer.
4. Maintain or replace the
expansion valve or the coil, and
reconnect cables.
5. Maintain or replace the indoor
fan.
6. Measure the ambient
temperature.
1. Identify and repair the leaking
point, and refill refrigerant after
maintenance.
2. Calibrate or replace the
pressure sensor.
3. Maintain or replace the filter
dryer.
4. Maintain or replace the
expansion valve or the coil, and
reconnect cables.
5. Maintain or replace the indoor
fan.
6. Measure the ambient
temperature.
1. Adjust the positions of the
temperature sensors or
temperature and humidity
sensors.
2. Add air conditioners or
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 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.
123