Vertiv Liebert CRV4 Series User Manual

Vertiv | Liebert® CRV4 | User Manual 103
Troubleshooting
Symptom Possible Causes Items to be Checked or Handling Method
The contactor
does not get
closed, and the
compressor does
not start
Low discharging
overheat degree
alarm
Check the state of the micro-processing controller.
High pressure MCB
action
Check if there is an HP alarm.
Discharging
temperature alarm
Check whether a discharging low/high temperature alarm exists.
Low pressure alarm View if a low-pressure alarm exists in the history alarm.
Contactor faulty Check if the contactor is able to energize.
Compressor driver
faulty
Check the compressor driver.
The compressor
internal protector is
open
Check whether the compressor coil is an open circuit. In such
a scenario, wait till the coil is cooled following which it will be
automatically restored.
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.

Vertiv Liebert CRV4 Series Specifications

General

Brand	Vertiv
Model	Liebert CRV4 Series
Category	Air Conditioner
Language	English