Vertiv Liebert CRV4 Series User Manual

Vertiv | Liebert® CRV4 | User Manual 102
Troubleshooting
9.2. Troubleshooting of the Heating System
The heating system troubleshooting is explained in the Table 9-2.
Table 9-2 Troubleshooting of the Heating System
Symptom Possible Causes Items to be Checked or Handling Method
Heating system
does not start,
the contactor
does not close
No heating
demand
Check the state of the micro-processing controller, and conrm if
there is a requirement for the heating command.
Safety device
of the heating
system is open
Use a multi-meter to measure the resistance on both ends of the
temperature controller; if the resistance is very large, it indicates that
the safety device may be open. Next, check whether the fuse is open
and the temperature controller is damaged. Measure the resistance of
the heater with an ohmmeter to determine if the heater is damaged.
The contactor
closes, but
heating is
ineective
Heater main
power is O
Check if the heater’s MCB is turned ON; Check whether the L1, L2,
and L3 voltages are normal when the contactor is energized.
Electrical heater
burned
Turn O the power supply; then physically check the condition of the
heater.
9.3. Troubleshooting of Compressor and Cooling System
The cooling system troubleshooting is explained in the Table 9-3.
Table 9-3 Troubleshooting of the Compressor and Cooling System
Symptom Possible Causes Items to be Checked or Handling Method
Compressor
cannot be started
Does not power On
(Shutdown)
Check the main power supply against under-voltage, over-voltage,
and phase loss.
MCB and contactor
faulty
Check the compressor MCB, contactor, and connecting cables.
Alarm lock
View the unit alarm records, replace the damaged component and
power it On again.
Compressor coils
shorted and burnt
Check the motor and replace it in case of any defects or
malfunction

Vertiv Liebert CRV4 Series Specifications

General

Brand	Vertiv
Model	Liebert CRV4 Series
Category	Air Conditioner
Language	English