HP Performance Optimized Datacenter 20c Maintenance And Service Manual page 33

Pull the fan controller from the ceiling (2).
5.
Replacing the cooling fan controller
Insert the fan controller into the ceiling (1).
1.
Replace the four screws (2).
2.
Reconnect the outbound 24 V dc fan power cables.
3.
Reconnect the inbound 230 V power connectors.
4.
Return power to the controller.
5.
Take manual control of the fan speed in the affected zone from the ECS panel.
6.
Verify that the fans work properly.
7.
Return the fan bank to the AUTO mode of operation.
8.
Removal and replacement procedures 33