15. If the compressor makes a loud, unusual noise, invert the electrical connections of the phases
supplying the unit, which accepts only one direction of rotation.
16. Ensure that the fans rotate in the correct direction (see arrow on fan).
17. Ensure that all control system settings are correct and that there are no alarms (see Liebert
iCOM Control).
18. Water/Glycol-cooled Models Only: Verify the water flow is adequate.
19. Water/Glycol-cooled Models Only: For closed circuit units, ensure that the water pump starts
when the compressor starts.
10.1 Checks to Perform after Start-up
Once the system is operating under load, check the various components, as follows:
1. Verify that the fans are operating properly.
2. Ensure that the temperature and relative humidity are being controlled, and that the
humidifier (optional) and heating steps (optional) operate when required.
3. Ensure that the compressor operates when required.
4. Ensure that the fan operation controller on the external condenser/drycooler (if fitted) is
calibrated correctly, and that it controls the fan operation.
5. Record all of the following on the warranty inspection form:
a. All component voltages and current draws
b. All air / water temperatures indoor and outdoor
c. All refrigerant and water / glycol pressures,
d. All levels of refrigerant and oil in sight glasses
e. Record refrigerant pressure switch settings and operating pressures
f. Record superheat and subcooling.
6. Operate unit at full heat load, normal room conditions, and normal water/glycol fluid
temperatures for a minimum of 30minutes, and read/compare the superheat and subcooling
values against Table 6.14 on page51. Adjusting the refrigerant charge as described in
Superheat and Refrigerant Charge Optimization on page50 will maximize unit capacity and
efficiency at full-load conditions.
10.2 Automatic Restart
The unit may be set to automatically restart on the return of power after a supply power interruption
using the Liebert iCOM controller.
To avoid an automatic cold restart of the compressor if a power interruption of several hours is expected,
stop the unit before the blackout. After power returns, allow the compressor to preheat before restarting
the unit.
Vertiv | Liebert CRV Installer/User Guide | 112
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