Remove the Lenovo Neptune(TM) Processor Direct Water Cooling Module

Follow the instructions in this section to remove the Direct Water Cooling Module (DWCM). The procedure must be executed by a trained technician.

About this task

Safety information for liquid detection sensor module cable

S011

CAUTION

Sharp edges, corners, or joints nearby.

Attention

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

• 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.

• Power off the server and peripheral devices and disconnect the power cords and all external cables. See Power off the server.
• If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top cover, or remove the chassis from the rack. See Remove the server from rack.
• Two people and one lifting device on site that can support up to 400 lb (181 kg) are required to perform this procedure. If you do not already have a lifting device available, Lenovo offers the Genie Lift GL-8 material lift that can be purchased at Data Center Solution Configurator. Make sure to include the Foot-release brake and the Load Platform when ordering the Genie Lift GL-8 material lift.

Prepare the following screwdrivers to ensure you can install and remove the corresponding screws properly.

Torque screwdriver type list	Screw Type
Torx T30 head screwdriver	Torx T30 screw

Procedure

1. Make preparations for this task.
   1. Remove the server from the rack. See Remove the server from rack.
   2. Remove the front top cover. See Remove the front top cover.
   3. Remove the rear top cover. See Remove the rear top cover.
   4. Remove the processor air baffle. See Remove the processor air baffle.
   5. Disconnect the PCIe cables and front I/O cables from the system board. See PCIe switch board cable routing and Front I/O module and integrated diagnostics panel cable routing. Release the cables from the cable clips and keep them away from the DWCM.
   6. Disconnect the leakage sensor module cable of the DWCM from the connector on the system board. See Leakage sensor module cable routing.
2. Disengage the leakage sensor module.
   1. Push the holder latches to both sides to unlock the module.
   2. Disengage the leakage sensor module from the holder.
   Figure 1. Disengage the leakage sensor module
   
   
3. Remove the leakage sensor module holder bracket.
   1. Unfasten the four M3 screws that secure the leakage detection sensor module holder bracket to the chassis.
   2. Grasp the bracket and lift it from the chassis.
   Figure 2. Removing the leakage sensor module holder bracket
   
   
4. Remove the hose cover.
   1. Unfasten the three M3 screws that secure the hose cover to the chassis.
   2. Disengage the hose cover from the hose opening on the chassis by sliding it away from the opening; then, remove it from the chassis.
   Figure 3. Removing hose cover
   
   
5. Remove the hoses.
   1. Disengage the hoses from the hose clips and holders.
      Figure 4. Disengaging the hoses
      
      
   1. Unfasten the two M3 screws that secure the hose holder to the chassis.
      Figure 5. Removing the hose holder
      
      
   2. Disengage the first hose from the hose holder as illustrated; then, remove the hose holder from the hose opening on the chassis by sliding it towards the front of the chassis.
   3. Remove the hose holder from the hose opening on the chassis by sliding it away from the opening.
      Figure 6. Disengaging the hose
      
      
   4. Remove the second hose through the opening.
      Figure 7. Removing the hose

      
      
      
6. Remove the cold plate top covers.
   Note

   Remove the four memory modules adjacent to the heat sinks to avoid damage. Record each memory module before removing it.

   Figure 8. Removing the cold plate top covers
   
   
7. Remove the DWCM from the processor board.
   1. Fully loosen the Torx T30 nuts on the cold plate assembly. (For reference, the torque required for the fasteners to fully loosen is 1.1±0.2 newton-meters, 10±2.0 inch-pounds).
   2. Rotate the anti-tilt wire bails inward.
   3. Carefully lift the DWCM from the processor sockets. If the DWCM cannot be fully lifted out of the socket, further loosen the Torx T30 nuts and try lifting the DWCM again.
      Figure 9. Removing the DWCM
      
      
8. Remove the processor from the retainer.
   1. Lift the handle to release the processor from the carrier.
   2. Hold the processor by its edges; then, lift the processor from the cold plate and carrier.
   3. Without putting the processor down, wipe the thermal grease from the top of the processor with an alcohol cleaning pad; then, place the processor on a static protective surface with the processor-contact side up.
      Figure 10. Removing the processor
      
      
      Note

      Do not touch the contacts on the processor.
   4. Repeat to remove the other processor.
9. Separate the processor carrier from the cold plate.
   1. Release the retaining clips from the cold plate.
   2. Lift the carrier from the cold plate.
   3. Wipe the thermal grease from the bottom of the cold plate with an alcohol cleaning pad.
      Figure 11. Separating a processor carrier from the cold plate
      
      
      Note

      The processor carrier will be discarded and replaced with a new one.
   4. Repeat the separate the other processor from the cold plate.