Huawei FusionModule1000A20 Maintenance Manual page 75

FusionModule1000A20 Prefabricated All-in-One
Data Center
Maintenance Guide
Symptom Alarm
● Overvolta
ge AC
● Undervolt
age AC
● Overvolta
ge DC
● Undervolt
age DC
The fresh air ● Cooling
integrated Capacity
unit is Insufficie
powered on nt 1
but has
● Compress
insufficient
or VFD 1
cooling
Overcurre
output.
nt
● Compress
or VFD 1
Overtem
perature
● High
Pressure
1 Alarm
● Low
Pressure
1 Alarm
Issue 03 (2022-12-15)
Possible
Cause
The fresh air
integrated
unit has no
cooling
output
because the
AC or DC
power
supply is
abnormal.
The cooling
output of
the fresh air
integrated
unit is
insufficient
because the
compressor
is faulty.
The cooling
output of
the fresh air
integrated
unit is
insufficient
because the
condenser
or
evaporator
is blocked
by dirt or
the
circulation
airway is
blocked by
foreign
matter.
Copyright © Huawei Digital Power Technologies Co., Ltd.
5 Common Faults and Troubleshooting Measures
Solution
1. Check whether the power supply is correctly
connected.
2. Choose System Status > Environment Status,
and check the supplied DC and AC voltages.
3. Use a multimeter to measure the upstream
power supply voltage of the fresh air integrated
unit. If the measured voltage exceeds the
threshold, the power grid voltage is abnormal.
4. Check whether the corresponding circuit breaker
in the upstream power distribution frame (PDF)
has tripped. If not, check whether the PDF works
properly.
Replace the compressor with a new one as follows:
1) Remove the left outdoor cover. 2) Remove the
compressor cables, suction pressure sensor, and
temperature sensor. 3) Reclaim the refrigerant. 4)
Tear off the thermal insulation pipe at the welding
point and wrap the two ends of the welding point
with wet cloth. 5) Weld off the connecting pipe. 6)
Loosen the compressor nuts, remove the compressor,
weld off other welding joints, and replace the
compressor. 7) Install the new compressor in a
reverse order of steps 6 to 1. (After the installation,
vacuumize the pipeline, preserve the pressure to
verify the air tightness, and then fill refrigerant.)
● The condenser is blocked by dirt:
Measure: Use a washing tool to clean the
condenser until the drainage becomes clean.
● The evaporator is blocked by dirt:
Measure: Use dry cotton cloth to wipe off the dirt
or blockage.
● The indoor air supply or return vent is blocked by
foreign matter:
Measure: Remove the blockage.
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