User's Manual

Start the Liebert DCP with Liebert iCOM
®
63 Liebert
®
DCP
™
5.0 START THE LIEBERT DCP WITH LIEBERT ICOM
®
5.1 Checklist for Liebert DCP Startup
1. Verify that bypass flow controllers were installed (if applicable).
2. Check all isolation ball valves in the Liebert DCP and cooling module and verify that all are open.
3. Check rotation of the Liebert DCP’s pumps.
4. Verify that air is being discharged into the cold aisle.
5. Confirm that the system has been properly filled with water (see 3.7 - Filling Instructions).
6. Confirm that the remote temperature/humidity sensors provided have been installed in optimal
locations (see
2.4 - Remote Sensor Installation—Proper Placement)
The Liebert DCP system is now ready to be turned ON.
5.2 Starting the Liebert DCP with Liebert iCOM Controller
The Liebert DCP is started, stopped and controlled through the Liebert iCOM controller. Figure 25
shows the Liebert iCOM keypad.
1. Turn the Liebert DCP On with the user interface (I/O button). Allow the system to attempt to
start for at least 2 minutes.
If the Liebert DCP pump cannot maintain flow and continues to switch over due to starting
difficulties, refer to
7.0 - Troubleshooting.
2. Check flow switch functionality:
The Liebert DCP system should be On. If it is Off:
a. Turn the Liebert DCP On via user interface (I/O button).
If no “Loss of Flow” alarm is present—This suggests that there is flow. Test the flow
switch by closing the ball valve on either the suction line or discharge line to stop the flow.
This should prompt an alarm for “loss of flow on P1.” This alarm confirms that the switch has
opened on low flow.
If a “Loss of Flow” alarm is present—This suggests that there is no flow. Verify that this
is correctly annunciated by checking for proper water charge (see
3.7 - Filling Instructions.)
However, if there is flow, the flow switch could be faulty. Check the flow switch, making
sure that the electrical connections are properly connected.
Then check the flow switch electrically by making sure that the unit has 24VAC across it.
NOTE
Before any action that could cause a disturbance in the Liebert DCP system’s cooling function
is begun, the facility manager MUST be informed. In addition, after the action is taken and the
work is finished, the facility manager MUST be informed