Vertiv | Liebert
CRV
+ | User Manual
76
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 confirm 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 judge if the
heater is damaged
The Contactor
closes, but
heating is
ineffective
Heater main power is off
Check if the heater's MCB is turned ON; Check
whether the L1, L2, and L3 voltages are normal
when the contactor is energized
Electric heater burned
Turn off the power; then physically check the
condition of the heater.
Troubleshooting of compressor and cooling system
Symptom
Possible causes
Items to be checked or handling method
Compressor can’t
be started
Does not power on
(Shutdown)
Check the main power 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
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 Contactor
does not get
closed, and the
compressor does
not start
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 restored
automatically
Summary of Contents for Liebert CRV Plus
Page 1: ...Liebert CRV Precision Air Conditioner User Manual ...
Page 2: ......
Page 9: ...PART I GENERAL INFORMATION ...
Page 10: ......
Page 21: ...Vertiv Liebert CRV User Manual 11 Part II INSTALLATION ...
Page 59: ...Vertiv Liebert CRV User Manual 49 PART III SYSTEM OPERATION GENERAL MAINTENANCE ...
Page 95: ...Vertiv Liebert CRV User Manual 85 APPENDIX 4 Hazardous Substances or Elements Declaration ...