7.2 Start-up Procedure
7.2.1 First Start-up (or After Long Standstill)
To prevent the compressor from damaged, preheat the compressor for at least 12 hours before starting the unit (the
compressor is preheated by its crankcase heater). Start the unit as follows:
1.
Open all valves in the system according to the instruction labels attached to the valves.
2.
Using a leak detector, verify that there are no refrigerant leaks. If there are any, then repair the leak and
recharge the refrigerant.
3.
At least 4 hours before start-up, close the main switch and the circuit breaker for transformer protection on the
electrical panel. The HMI will turn on immediately to indicate the presence of electrical power. If the screen
does not light up, check the main power supply.
4. Check that there are no water leaks.
5.
Disconnect all circuit breakers.
6. Check if the supply voltage is normal. If so, switch on all the circuit breakers.
7.
Ensure that the compressor has been preheated for at least 4 hours before starting the unit.
8.
Start the unit by pressing and holding the ON/OFF button on the HMI display for three seconds.
9. Ensure that all control system settings are correct and that there are no alarms.
10. Once the system is operating under load, carry out the following checks:
•
Verify that the fans are operating properly.
•
Ensure that the temperature and relative humidity are reached, and that the humidifier and heaters
operate when required.
•
Ensure that the compressor operates when required.
•
Ensure that the fan speed controller on the external condenser is calibrated correctly, and that it controls
the fan operation.
•
Ensure that all the sensors have been calibrated.
7.2.2 Automatic Restart
The unit will automatically restart on the return of power after a power interruption.
7 Start-up
54
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual