Remove a manifold from the rack

Follow instructions in this section to remove a manifold from the rack The procedure must be executed by a trained technician..

About this task

S036

18 - 32 kg (39 - 70 lb)	32 - 55 kg (70 - 121 lb)

CAUTION

Use safe practices when lifting.

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.

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.

CAUTION

Electrical current from power, telephone, and communication cables is hazardous. To avoid a shock hazard:

• Connect all power cords to a properly wired and grounded electrical outlet/source.
• Connect any equipment that will be attached to this product to properly wired outlets/sources.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• The device 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.

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.
• Touch the static-protective package that contains the component to any unpainted metal surface on the server; then, remove it from the package and place it on a static-protective surface.

Note

Ensure the following tools are available to perform the replacement:

• Two 30L containers (one labeled with “Fresh” and one labeled with Waste") with integrated hose mounts
• Air compressor
• Approved coolant: PG25, NALCO® TCS101, or HPCCL2000 (Deionized water premixed with a compatible antimicrobial agent)
• Cordless transfer pump
• Lift tool
• Liquid cooling service kit includes below:
  • Air input kit: Connects the air compressor to the manifold
  • Filler kit: Connects the pump to the manifold
  • Coolant source kit: Connects the coolant container to the pump
• Manifold accessory kit
• Phillips #1 bit
• Phillips #2 bit
• Spill kit
• Torque screwdriver
• Torx T25 bit
• Torx T40 bit

Procedure

1. Make preparation for this task.
   1. Disconnect all power sources to avoid electric shock.
      1. Press and hold the latches on both sides of the power whip.
      2. Pull out the power whip.

      Note

      Removing the power whip may require two people to ensure sufficient force is applied for a proper disconnection.

      Figure 1. Removing the power whip
      
      
   2. Remove all the compute trays, management switches, NVLink switch trays, and power shelves. See Remove a compute tray from the rack, Remove a management switch from the rack, Remove an NVLink switch tray from the rack, and Remove a power shelf from the rack.
   3. Remove the cable cartridges. See Remove a cable cartridge from the rack.
2. Remove the busbar bracket.
   1. Loosen the twelve screws that secure the bracket.
      Figure 2. Loosening the screws
      
      
   2. Remove the bracket from the rack.
      Figure 3. Removing the busbar bracket
      
      
3. Remove the bottom leakage drip tray.
   1. Disconnect the hose.
   2. Loosen the two screws securing the tray.
   3. Remove the tray out of the rack.
   Figure 4. Removing the bottom leakage drip tray
   
   
4. To begin the draining procedure, process each manifold individually. Designate the two manifold hoses as the inlet and outlet according to the manifold layout as illustrated below.
   Figure 5. Manifold layout
   
   

   1 Return hose 1	2 Return hose 2
   3 Supply hose 1	4 Supply hose 2

5. Disconnect the hoses connected to facility supply.
   1. Press the button on the ball valve switch.
   2. Rotate the switch to close the valve
   3. Remove the hoses from the facility supply.
   4. Repeat for the other hose.
   Figure 6. Disconnecting the hoses
   
   
6. Place the two supply hoses into the drainage container labeled with “Waste”.
   1. Press the button on the ball valve switch.
   2. Rotate the switch to open the valve as illustrated.
   3. Repeat for the other ball valve.
   Figure 7. Placing the supply hoses into the drainage container
   
   
7. Drain the coolant from the manifold.
   1. Remove the quick connector cap.
   2. Attach the air input kit to both the quick connector and the air compressor as illustrated below.
      Figure 8. Attaching the air input kit
      
      
   3. Activate the compressor to apply air pressure. Maintain this for approximately ten minutes.
   4. Once the coolant stream stops, deactivate the compressor and close the ball valve.
8. Repeat the draining process above for the return side if necessary, ensuring all coolant flow has completely stopped.
9. Remove the outer extension bracket.
   1. Loosen the twenty screws from the bracket.
   2. Remove the bracket.
   Figure 9. Removing the outer extension bracket
   
   
10. Remove the inner extension bracket.
    1. Loosen the ten screws from the bracket.
    2. Remove the bracket.
    Figure 10. Removing the inner extension bracket
    
    
11. Loosen the four thumbscrews.
    Figure 11. Loosening the thumbscrews
    
    
12. Remove the twenty-seven screws from the side of each rail.
    Figure 12. Removing the screws
    
    
13. Loosen the twenty-seven thumbscrews on the rear rack.
    Figure 13. Loosening the thumbscrews
    
    
14. Remove the manifold.
    1. Loosen the two bottom screws.
    2. Loosen the two top screws.
    3. Remove the manifold from the rack.
    Figure 14. Removing the manifold
    
    
15. Repeat the same steps above to remove the other manifold if needed.