Remove the DWC PSU manifold

Use this information to remove the DWC PSU manifold.

About this task

CAUTION

The water might cause irritation to the skin and eyes. Avoid direct contact with the lubricant.

S002

CAUTION

The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

S038

CAUTION

Eye protection should be worn for this procedure.

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

• Ensure proper handling procedures are followed when working with any chemically treated water used in the compute rack cooling system. Ensure that material safety data sheets (MSDS) and safety information are provided by the water chemical treatment supplier and that proper personal protective equipment (PPE) is available as recommended by the water chemical treatment supplier. Protective gloves and eyewear may be recommended as a precaution.

• The task in this section requires two or more people.

Procedure

1. If the node is turned on, turn off the node.
2. Disconnect the power cord from the electrical outlet; then, disconnect the other end of the power cord from the back of the power supply.
3. At the front of the rack, press the unlock pin () and close both Eaton ball valves (); then disconnect the hoses.
   CAUTION

   Water is under pressure and may spray when initially opening the ball valve.

   Figure 1. Eaton ball valves closed
   
   

   Table 1. Eaton ball valves

   1 Rack supply (DWC PSU manifold)

   2 Rack return (DWC PSU manifold)

4. Place the rack return hose in a bucket, then press the ball valve unlock pin and slowly rotate the valve actuator handle until the valve opens about 1/4 of the way.
   Note

   Do not fully open the rack ball valve or you will reduce your ability to control the flow as you drain the rack.

   Figure 2. Rack return hose in bucket
   
   

   Table 2. Rack return hose in bucket

   1 Rack return (DWC PSU manifold)

5. Connect the hose assembly (supplied to customer installation site) to the top quick connect at Location A (top of the DWC manifold) and place the other end in a bucket. Slowly open the hose valve to allow air to flow into the hose. Close the hose valve once water stops flowing (it may take approximately one minute).
   Figure 3. Hose assembly to top quick connect
   
   
6. Depress the lock pin and rotate the valve actuator handle in the opposite direction on the rack return hose to close the ball valve.
7. Place the rack supply hose in a bucket, then press the ball valve unlock pin and slowly rotate the valve actuator handle until the valve opens about 1/4 of the way.
   Note

   Do not fully open the rack ball valve or you will reduce your ability to control the flow as you drain the rack.

   Figure 4. Rack supply hose in bucket
   
   

   Table 3. Rack supply hose in bucket

   1 Rack supply (DWC PSU manifold)

8. Disconnect the hose assembly from Location A and connect it to Location B. Slowly open the hose valve to allow air to flow into the hose. Close the hose valve once water stops flowing (it may take approximately one minute).
   Note

   Be sure to always close the valve on the hose before disconnecting it.

   Figure 5. Hose assembly at Location B
   
   
9. Disconnect the hose assembly from Location B.
10. Close the valve on the rack supply hose.
11. Disconnect all DWC PSU Manifold hoses from all DWC Power Supply Quick Disconnects
    Figure 6. DWC PSU hose assembly removal
    
    
12. Remove the two nuts that secure the bottom rack manifold mounting bracket to the rack cabinet.
    Figure 7. Bottom rack manifold mounting bracket nuts removal
    
    
13. Remove the two nuts that secure top rack manifold mounting bracket to the rack cabinet.
    Figure 8. Top rack manifold mounting bracket nuts removal
    
    
14. Remove the DWC PSU manifold assembly.
    1. Pull down on plunger knob and hold while rotating manifold out and away from rack.
    2. Rotate the top part of the DWC PSU manifold assembly from the rack cabinet as shown.
    3. Lift the DWC PSU manifold assembly out of the bottom rack manifold mounting bracket to remove it from the rack cabinet. (Ensure manifold is clear of the threaded studs on the bottom rack manifold mounting bracket before lifting it out of rack).
    Figure 9. DWC PSU manifold assembly removal
    
    
15. Remove six screws to remove the top rack manifold mounting bracket.
    Figure 10. Top rack manifold mounting bracket removal
    
    
16. Remove four screws to remove the bottom rack manifold mounting bracket.
    Figure 11. Bottom rack manifold mounting bracket removal