Remove the manifold (in-rack system)

Use this information to remove the manifold in an in-rack direct water cooling system.

About this task

Important

This task must be operated by trained technicians that are certified by Lenovo Service. Do not attempt to remove or install the part without proper training and qualification.

CAUTION

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

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.

S011

CAUTION

Sharp edges, corners, or joints nearby.

S038

CAUTION

Eye protection should be worn for this procedure.

S040

CAUTION

Protective gloves should be worn for this procedure.

S042

DANGER

danger

Risk of electric shock due to water or a water solution which is present in this product. Avoid working on or near energized equipment with wet hands or when spilled water is present.

Attention

• Power off the node (see Power off the node); then, disconnect all external cables from the node.

• Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

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

• This task requires two or more people.

Procedure

1. Power off the in-rack CDU and disconnect all power cords.
2. Close both ball valves.
   Figure 1. Closing ball valves
   
   
   1. Press the button on the ball valve switch.
   2. Rotate the switch to close the valves as illustrated above.
3. Remove the quick connect plugs to separate the DWCM hoses from the manifold.
   Figure 2. Quick connect plug removal
   
   
   1. Press the latch down to unlock the hose.
   2. Pull the hose off.
   3. Re-install the rubber quick connect plug covers to the ports on the manifold.
4. Repeat 3 to the other manifold.
5. Disengage the connection set from ball valves.
   Figure 3. Removing the connection set
   
   
   1. Rotate the ball valve to the left.
   2. Pull the connection set off from ball valve.
6. Remove the manifold with the connection set attached.
   Figure 4. Removing the manifold
   
   
   1. Hold the manifold with both hands, and lift it upward to relocate the spools from the small openings to large ones on the rack cabinet.
   2. Remove the manifold with the connection set attached.
7. Repeat 6 to the other manifold.
   Note

   • There is remaining coolant inside the manifold and the connection set. Remove both together and leave the further draining to the next step.

   • For more information about the rack cabinet, see ThinkSystem Heavy Duty Full Depth Rack Cabinets User Guide.

8. Install the bleeder kit to the manifold supply side.
   Note

   This step drains the coolant with the help of a pressure difference inside and outside the supply manifold.

   Figure 5. Installing the bleeder kit to the supply side
   
   
   1. Remove the rubber quick connect plug covers from the ports on the manifold.
   2. Plug the bleeder kit to the manifold.
9. Slowly open the bleeder valve to allow a steady stream of coolant to drain. Close the bleeder valve once coolant stops flowing.
   Figure 6. Opening the bleeder valve
   
   
10. Install the bleeder kit to the manifold return side.
    Note

    This step drains the coolant with the help of a pressure difference inside and outside the return manifold.

    Figure 7. Installing the bleeder kit to the return side
    
    
    1. Remove the rubber quick connect plug covers from the ports on the manifold.
    2. Plug the bleeder kit to the manifold.
11. Slowly open the bleeder valve to allow a steady stream of coolant to drain. Close the bleeder valve once coolant stops flowing.
    Figure 8. Opening the bleeder valve
    
    
12. Separate the manifold from the connection set in a dry and clean work area, and keep a bucket and absorbent cloths around to collect any coolant that may drain out.
    Figure 9. Separating the manifold from the connection set
    
    

    1 17 mm wrench

    1. Loosen the screw that locks the ferrule.
    2. Put the screw down.
    3. Open the clamp.
    4. Remove the ferrule and connection set from the manifold.
13. Repeat 12 to the other manifold.
14. For better sanitation, keep the manifold ports and connection sets dry and clean. Re-install quick connect plug covers or any covers that protect connection sets and manifold ports.