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Checklist for Liebert XDP Startup
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3.0 CHECKLIST FOR LIEBERT XDP STARTUP
1. Verify that bypass flow controllers were installed (if applicable), see Table 4.
2. Check all isolation ball valves in the Liebert XDP and Liebert XD cooling module and verify that
all are open.
3. Check rotation of the Liebert XDP’s pumps.
On 460V units only, use the rotation device provided—this device must be held against the
pump housing—at the inspection screw prior to energizing the pumps—counterclockwise indi-
cates proper rotation; clockwise indicates incorrect rotation.
On 208V units only, view the LED indicator on the pump—Green indicates proper rotation;
Green and Red indicate incorrect rotation.
4. Check rotation of fans on Liebert XD cooling module units.
5. Verify that air is being discharged into the cold aisle.
6. Confirm that the total calculated refrigerant R-134a amount has been properly charged into the
system (see 3.1 - Filling the Pumped Circuit—R-134a).
7. Confirm that the remote temperature/humidity sensor provided has been installed in the correct
location.
The correct location is near the return side of a main air mover, such as a Liebert Deluxe
System/3. If more than one Liebert XDP is installed, use a different location for each remote sen-
sor for best temperature/humidity calculation.
The Liebert XDP system is now ready to be turned ON.
1. Turn On all of the Liebert XD cooling module fans.
2. Turn the Liebert XDP On via its user interface (I/O button). Allow the system to attempt to start
for at least 2 minutes.
If the Liebert XDP pump cannot maintain flow and continues to switch over due to starting diffi-
culties, proceed to Step 4 and refer to 6.0 - Troubleshooting.
3. If constant flow is established, wait until the Liebert XDP has been operating for 10-15 minutes,
then verify that the refrigerant level in the receiver sight glass is between the second and third
level (see Figure 21). Add or remove charge, if necessary.
4. Check pressure differential functionality:
The Liebert XDP system should be On. If it is Off:
a. Turn On the Liebert XD cooling module fans
b. Turn the Liebert XDP On via user interface (I/O button).
!
CAUTION
Risk of piping and component rupture. May cause injury or equipment damage.
Closing service valves may isolate liquid refrigerant, causing high pressure and rupture of
piping. Do not close valves without following recommended procedures for repair,
maintenance and replacement of components. Install pressure relief valves in field piping
that may become isolated by service valves.
NOTE
Before any action that could cause a disturbance in the Liebert XD 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
Table 5 Liebert XDP pump light indicator—208V and 400V units
Indicator Lights
Description
Green Red
Off Off The electricity supply has been switched off or the pump has been cut out by the thermal switch.
On Off The electricity supply has been switched on. Normal operation.
On On The electricity supply has been switched on. The direction of rotation is wrong.