Vertiv | Liebert XDH | User Manual
68
Troubleshooting
Table 8-2 Fault Diagnosis and Handling Methods of EEV
Symptom
Potential Causes
Check Items and Handling Methods
The
adjustment
of the EEV is
faulty.
The temperature
sensor or pressure
sensor is faulty
Check whether the sensor cable is firmly connected.
Check whether the sensor cable position on the control board
is correct.
The control board is
power Off
Check whether the output fuse of the transformer has tripped/
broken.
Check whether the input power of the control board of the EEV
has 24 V power supply.
The cable
connection of the
control board is
faulty
Check whether the valve cable connection on the control
board of the EEV is faulty.
Check whether the communication cable between the
EEV control board and the main control board is properly
connected.
8.3.Fault Diagnosis and Handling of the Air Conditioning System
When the air conditioning system component is faulty, identify the potential causes and tackle the problem to
ensure normal operation of the unit.
describes the major faults and troubleshooting methods in the
refrigeration system.
Table 8-3 Refrigeration System Faults and Troubleshooting Methods
Symptom
Potential Causes
Check Items and Handling Methods
The surface of
the evaporator
has serious
condensation.
The two-port water valve is
faulty
Check whether the two-port water valve is
faulty, resulting in low water temperature due to
imbalance.
Check whether the surface
of the evaporator is filth
blocked
Check the surface of the evaporator, blockage may
result in non-smooth discharge of the condensate
water.
Air volume
decrease
The air filter is blocked
Periodically check the filter and replace it in a timely
manner to avoid air volume attenuation due to filth
blockage.
The fan is faulty
Check whether the fan is faulty.
describes
the diagnosis and handling methods.
Blockage of the evaporator
Check the surface of the micro-channel evaporator
and periodically handle the blockage problem.
