28. Plug all the contactor output plugs back into the board in their correct positions.
29. Plug P24 back into the control board.
30. Once the control board has completed its boot cycle and all the contactors are energized, wait 5seconds.
31. Press the ESC button.
32. Use the UP or DOWN arrows until A-- is on the display.
33. Press ENT button.
34. Use the UP or DOWN arrows to see if any of the following errors are shown.
a. 115: Unable to communicate with Fan 1.
b. 215: Unable to communicate with Fan 2.
c. 315: Unable to communicate with Fan 3.
d. 415: Unable to communicate with Fan 4.
35. If any of these errors appear, check the communication wiring at the problem fan and the fan before it.
36. If the wiring is correct and properly wired to the terminal, repeat the fan addressing procedure in steps 14
through 34 .
37. If none of the errors listed in step 34 are displayed, press the ESC button.
11.4.4 Verifying the Fan Address
To verify that each fan has a unique address:
1. Use the UP or DOWN arrow button until C-- displays.
2. Press the ENT button.
3. In the Manual/System Control Selection parameter use the UP or DOWN arrow button until C24 displays.
4. In the Manual Control configuration parameter, press the ENT button.
5. Use the UP or DOWN arrow button to select 0.
6. Press the ENT button. The displays reads 888 if the command is accepted.
7. Press the ESC button to display C24.
8. Use the UP or DOWN arrow button until C34 displays.
9. Press ENT button. If Fan 1 is running, the fans speed should display in terms of percentage of full speed. If Fan 1 is
not running, 0.00 should display.
10. Use the UP or DOWN arrow button to enter 100% speed.
11. Press the ENT button. The display reads 888 if the command is accepted.
• Fan 1 should speed up to 100%, and all the other fans should stay the same speed.
12. If Fan 1 is not running or if any of the other fans also speed up to 100%, steps 15 through 22 of Replacing the
Condenser EC Fan on page57, must be repeated.
13. Press the ESC button for the parameter to be shown on the display.
14. Repeat steps 3 through 8 for the rest of the fans, if present.
• C35: for Fan 2.
• C36: for Fan 3.
• C37: for Fan 4.
NOTE: All fans should be at 100% speed.
15. Use the UP or DOWN arrow button until C24 displays.
11 Maintenance Proprietary and Confidential ©2024 Vertiv Group Corp. 61
Vertiv™ Liebert® MCV Installer/User Guide
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