Vertiv Liebert CR045 - Page 115

Vertiv | Liebert® CRV4 | User Manual 104
Troubleshooting
Symptom Possible Causes Items to be Checked or Handling Method
Low suction
pressure or liquid
returned
Insuicient
refrigerant in the
system
Check for leaks. Seal the leaking point and add the refrigerant.
Air lter too dirty Replace the air lter.
Filter dryer clogged Replace the lter dryer.
Improper super-
heating degree
Check the control board of the Electronic Expansion Valve (EEV).
Sensing element
of the Electronic
Expansion Valve
(EEV) is faulty
Replace the sensing element.
Improper airow
distribution
Check the air supply and return systems.
Low condensing
pressure
Check whether the condenser is faulty.
Compressor too
noisy
Liquid returned
Refer to the handling methods of “Low suction pressure” or “liquid
returned”.
Bearing worn out
due to lubricant
loss
Add lubricant.
Compressor over
temperature
Too high
compression ratio
Check the settings of the HP switch and LP switch, and inspect if
the condenser is clogged.
Check that the fans of the evaporator and condenser are normal.
Too high suction
overheat
temperature
(degree)
Regulate the EEV or add proper amount of refrigerant.