Vertiv | Liebert CRV+ | User Manual 77
Symptom Possible causes Items to be checked or handling method
The Compressor
stops after
running for 3
minutes.
Contactor open
Refrigerant leaked, the low
pressure check is too low or
abnormal
Check the suction pressure
Check the circuit of the low pressure sensor
Calibrate accordingly so that the low pressure
sensor reader is within ±0.3 bar range of the
actual pressure
High pressure
protection
Condenser clogged Clean the condenser
Condenser system does not
start
Check the condenser fan for the air-cooled
system
Too much refrigerant has
been charged
Check whether the sub-cooling degree is too
high
Low exhaust
pressure
Refrigerant leaked
Locate the leakage point, repair it and add the
refrigerant
The Fan speed controller of
the outdoor unit is faulty,
while the output voltage
remains 100%, irrespective of
the change in the
condensing pressure
If the fan speed controller is found faulty, then
it has to be replaced
The suction and
exhaust pressures
do not change
after startup
Either the Compressor is
reversed or the internal air
tightness of the compressor
has failed
If the compressor is reversed, exchange any
two L lines of the compressor. If the internal air
tightness of the compressor has failed and
cannot be restored, replace the compressor
Low suction
pressure or liquid
returned
Insufficient refrigerant in the
system
Check for leaks. Seal the leaking point and add
the refrigerant
Air filter too dirty Replace the air filter
Filter drier clogged Replace the filter drier
Improper superheating
degree
Check the control board of the electronic
expansion valve (EEV)
electronic expansion valve
Replace the sensing element
Improper air flow distribution Check the air supply and return system
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
To Next Page
Loading...
