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

Follow the instructions in this section to install the Direct Water Cooling Module (DWCM).


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.

About this task

sharp edge
Sharp edges, corners, or joints nearby.
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Power off the server and peripheral devices and disconnect the power cords and all external cables. See Power off the server.

  • 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.

When removing a new DWCM from the shipping box, lift out the cold plate assembly with the shipping tray attached to prevent thermal grease on the cold plate assembly from damage.
Prepare the following screwdrivers to ensure you can install and remove the corresponding screws properly.
Torque screwdriver type listScrew Type
Torx T30 head screwdriverTorx T30 screw


  1. Install the hose holder to the chassis.
    Figure 1. Installing the hose holder

    1. Remove the screws that secure the firmware and RoT security module if needed.
    2. Align the screw holes on the hose holder with the screw holes on the firmware and RoT security module, and the guiding pins of the holder with the holes on the rear wall.
    3. Tighten the screws to secure the hose holder to the system I/O board.
  2. Install the processor to the DWCM. See Install a processor and heat sink.
    Figure 2. Installing the processor

    1. Align the triangular mark on the cold plate assembly label with the triangular mark on the processor carrier and processor.

    2. Install the DWCM onto the processor-carrier.

    3. Press the carrier into place until the clips at all four corners engage.

    If the server has only one processor installed, generally processor 1, it is required to install a cover to the empty socket of processor 2 before proceeding with further installation.
    Figure 3. Install the processor socket cover

  3. Install the processor-DWCM to the system board assembly.
    Figure 4. Installing the processor-DWCM

    1. Rotate the anti-tilt wire bails inward.

    2. Align the triangular mark and four Torx T30 nuts on the cold plate assembly with the triangular mark and threaded posts of the processor socket; then, insert the cold plate assembly into the processor socket.

    3. Rotate the anti-tilt wire bails outward until they engage with the hooks in the socket.

    4. Fully tighten the Torx T30 nuts in the installation sequence shown on the cold plate assembly. Tighten the screws until they stop; then, visually inspect to make sure that there is no gap between the screw shoulder beneath the cold plate assembly and the processor socket. (For reference, the torque required for the fasteners to fully tighten is 0.9-1.3 newton-meters, 8-12 inch-pounds.)

  4. Remove the module handle from the DWCM.
    Figure 5. Removing the module handle

    1. Rotate the screws as illustrated above to unlock the handle.
    2. Separate the handle from the DWCM.
    A new DWCM comes with a handle.
    1. To replace an old DWCM with a new one, remove the handle of the new one as illustrated above.

    2. To replace processors without changing the DWCM, a handle is not needed. Skip step 4 and proceed with further installation.

  5. Install the cold plate covers. Press the cover down as illustrated below.
    Figure 6. Installing cold plate covers

  6. Place the hoses and the liquid detection sensor module on the hose holder.
    Figure 7. Placing the hoses and module

    1. Place the hoses on the hose holder.
    2. Place the liquid detection sensor module on the hose holder.
    Figure 8. Installation details

    • Place the middle part of the hose against the blue latch, and insert the outlet hose 1 and the inlet hose 2 into the holder.

    • Check the guiding labels 3 on the hoses before installation, and align the labels with the front edge of the hose holder. Otherwise, the hoses might obstruct open connectors on the system board assembly.

    • Insert the liquid detection sensor module 4 to the holder beside the hoses. Make sure that the side with a status LED is up and route the cable as illustrated above.

    • For liquid detection sensor module working status, see LED on the liquid detection sensor module.

  7. Install the riser cage.
    • 1FH riser cage

      Figure 9. Installing the 1FH riser cage

    • 3FH riser cage

      Figure 10. Installing the 3FH riser cage

    1. Align the riser card with the riser slot on the system board assembly. Carefully press the riser card straight into the slot until it is securely seated.
    2. Tighten the screw to secure the riser cage.
  8. Connect the cable of the liquid detection sensor module to the connector on the system board assembly. See Direct water cooling module.
  9. Install the air baffle or middle drive cage. See Install the air baffle or Install the middle drive backplanes and drive cage.
  10. Install the top cover. See Install the top cover.
  11. Install the server into the rack. See Install the server to rack.
  12. Install the quick connect plugs to the manifolds. See Install the manifold (in-rack system) or Install the manifold (in-row system).

After you finish

Complete the parts replacement. See Complete the parts replacement.

Demo video

Watch the procedure on YouTube