Lenovo ThinkSystem Rear Door Heat eXchanger V2 User manual

ThinkSystem Rear Door Heat eXchanger V2
User Guide
Machine Type: 1756

First Edition (July 2021)
© Copyright Leno o 2021.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is deli ered pursuant to a General Ser ices
Administration (GSA) contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No.
GS-35F-05925.

Contents
Contents . . . . . . . . . . . . . . . . . i
Chapter 1. Rear Door Heat
eXchanger V2 . . . . . . . . . . . . . . 1
Chapter 2. Set up Rear Door Heat
eXchanger V2 . . . . . . . . . . . . . . 5
omplete setup of Rear Door Heat eXchanger V2
that comes with the rack . . . . . . . . . . . . 6
Replace a regular door with Rear Door Heat
eXchanger V2 . . . . . . . . . . . . . . . . 8
Water specifications for the secondary cooling
loop . . . . . . . . . . . . . . . . . . . 17
ontrol and conditioning of the secondary
cooling loop . . . . . . . . . . . . . . 17
Water delivery specifications for secondary
loops . . . . . . . . . . . . . . . . . 19
Fill the heat exchanger with water . . . . . . . . 27
Chapter 3. Routing cables/hoses for
water-cooled system . . . . . . . . . 33
Raised-floor environment . . . . . . . . . . . 34
Raised-floor and non-raised-floor environments . . 35
Chapter 4. Rear Door Heat
eXchanger V2 replacement . . . . . . 37
Drain the heat exchanger of water. . . . . . . . 37
Remove Rear Door Heat eXchanger V2 . . . . . 43
Install Rear Door Heat eXchanger V2 . . . . . . 47
Fill the heat exchanger with water . . . . . . . . 53
Replace the door latch . . . . . . . . . . . . 58
Appendix A. Getting help and
technical assistance . . . . . . . . . . 61
Before you call . . . . . . . . . . . . . . . 61
ontacting Support . . . . . . . . . . . . . 62
Appendix B. Notices. . . . . . . . . . 63
Trademarks . . . . . . . . . . . . . . . . 64
Index . . . . . . . . . . . . . . . . . . 65
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ii ThinkSystem Rear Door Heat eXchanger V2 User Guide

Chapter 1. Rear Door Heat eXchanger V2
See this topic to learn about parts of ThinkSystem Rear Door Heat eXchanger V2.
Figure 1. ThinkSystem Rear Door Heat eXchanger V2 components
Table 1. Rear Door Heat eXchanger components
1 Rear Door Heat eXchanger assembly 9 Hinge kit
2 Air-purging valve 10 Lift handles
3 Air-purging tool 11 Lift handle
4 Door latch 12 Serial number
5 Latch plate 13 Lift handle
6 Drain valve 14 Lower air baffle
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Table 1. Rear Door Heat eXchanger components (continue )
7 Return manifold coupling 15 Upper air baffle
8 Supply manifold coupling
Rear Door Heat eXchanger V2 specifications
Dimension • Depth: 129 mm / 5.0 inches
• Height: : 1950 mm / 76.8 inch
• Width: 600 mm / 23.6 inch
Weight Empty: 39 kg / 121 lbs
Air movement Provided by servers and other devices in the rack
Air temperature drop With high-heat-load devices, up to 25° (45°F) between the air exiting the rack devices
and the air exiting the heat exchanger.
Water • Source
User-supplied, compliant with specifications in this document
• Pressure
– Normal operation: <137.93 kPa (20 psi)
– Maximum: 689.66 kPa (100 psi)
• Volume
Approximately 9 liters (2.4 gallons)
• Temperature
– Above dew point
– 18° ±1° (64.4°F ±1.8°F) for ASHRAE lass 1 Environment
– 22° ±1° (71.6°F ±1.8°F) for ASHRAE lass 2 Environment
Note: See “Heat exchanger performance” for more information.
• Required water flow rate (as measured at the supply entrance to the heat exchanger)
– Minimum: 22.7 liters (6 gallons) per minute
– Maximum: 56.8 liters (15 gallons) per minute
For setup and installation, see hapter 2 “Set up Rear Door Heat eXchanger V2” on page 5.
Heat exchanger performance
Expected performance of the heat exchanger is illustrated in the following figure for a typical inlet air
temperature of 27° (80.6°F), with a fully populated rack, near uniform power dissipation, and a 30-40 kW
heat load. By selecting the correct water inlet temperature and water flow rate, you can achieve the
necessary heat removal. A heat removal of 100% indicates that an amount of heat equivalent to that
generated by the devices has been removed by the heat exchanger and the average air temperature leaving
the heat exchanger is identical to that entering the rack (27° /80.6°F in this example). Heat removal in
excess of 100% indicates that the heat exchanger not only removed all of the heat generated by the devices
but further cooled the air so that the average air temperature leaving the rack is actually lower than that
entering the rack.
2ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 2. Typical performance of the heat exchanger, 30 kW heat loa
As described in “Water specifications for the secondary cooling loop” on page 17, a given water temperature
may be used only if the system that is supplying the water is able to measure the room dew point and
automatically adjust the water temperature accordingly. Otherwise, the water temperature must be above the
maximum dew point that is allowed at that data center installation.
Performance data is shown in the following figure for a 20 kW heat load. Because of the lower heat load, a
specific level of cooling can be achieved with warmer water, a lower flow rate, or both.
Figure 3. Typical performance of the heat exchanger, 20 kW heat loa
hapter 1.Rear Door Heat eXchanger V2 3

4ThinkSystem Rear Door Heat eXchanger V2 User Guide

Chapter 2. Set up Rear Door Heat eXchanger V2
See this topic to learn how to install and set up ThinkSystem Rear Door Heat eXchanger V2.
About this task
Follow the instructions in the section corresponding to the installation scenario:
• If Rear Door Heat eXchanger V2 comes when installed to the rack, see “ omplete setup of Rear Door
Heat eXchanger V2 that comes with the rack” on page 6 to complete the setup procedure.
• To replace a regular rear door with Rear Door Heat eXchanger V2, see “Replace a regular door with Rear
Door Heat eXchanger V2” on page 8.
Important: Make sure to plan the cooling system with consideration of “Water specifications for the
secondary cooling loop” on page 17.
S010
CAUTION:
Do not place any object weighing more than 82 kg (180 lb) on top of rack-mounted de ices.
S019
CAUTION:
The power-control button on the de ice does not turn off the electrical current supplied to the de ice.
The de ice also might ha e more than one connection to dc power. To remo e all electrical current
from the de ice, ensure that all connections to dc power are disconnected at the dc power input
terminals.
R007
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DANGER
• Connect power cords from de ices in the rack cabinet to electrical outlets that are near the rack
cabinet and are easily accessible.
• Each rack cabinet might ha e more than one power cord. Be sure to disconnect all power cords
in the rack cabinet before you ser ice any de ice in the rack cabinet.
• Install an emergency-power-off switch if more than one power de ice (power distribution unit or
uninterruptible power supply) is installed in the same rack cabinet.
• Connect all de ices that are installed in a rack cabinet to power de ices that are installed in the
same rack cabinet. Do not connect a power cord from a de ice that is installed in one rack
cabinet to a power de ice that is installed in a different rack cabinet.
R004
CAUTION:
See the instructions in the rack documentation before you install de ices, remo e de ices, or relocate
the rack.
S038
CAUTION:
Eye protection should be worn for this procedure.
Complete setup of Rear Door Heat eXchanger V2 that comes with the
rack
See this topic to learn how to complete setup of ThinkSystem Rear Door Heat eXchanger V2 when it comes
already installed to the rack.
Procedure
Step 1. Remove the brackets that support the rear door heat exchanger.
6ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 4. Removing the supporting brackets
Step 2. Make sure that one specially trained person holds onto the rear door heat exchanger and guides
the rack down the ramp. The other specially trained persons must guide the rack down the ramp by
holding onto the rack frame. Slowly roll the rack down the ramp until the casters are on the floor.
Move the rack to the final location.
Figure 5. Moving the rack cabinet from the pallet
After this task is completed
hapter 2.Set up Rear Door Heat eXchanger V2 7

Proceed to “Fill the heat exchanger with water” on page 27.
Replace a regular door with Rear Door Heat eXchanger V2
See this topic to learn how to replace a regular rear door with ThinkSystem Rear Door Heat eXchanger V2.
Procedure
Step 1. Extend each of the four leveling pads in turns until they firmly contact the floor and support the rack
cabinet. Make sure the cabinet is balanced by gently pushing the cabinet. If it tilts, adjust the length
of the leveling pads until the cabinet is well balanced.
Figure 6. Lowering the leveling pa s
Step 2. Remove the rear door from the rack cabinet.
8ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 7. Removing a oor
Step 3. Remove the two door hinges and the two doorstops.
hapter 2.Set up Rear Door Heat eXchanger V2 9

Figure 8. Removing the oor hinges an oorstops
Step 4. Remove the door latch.
Figure 9. Removing the oor latch
Step 5. Align the holes in the latch plate with those in the two clip nuts; then, secure the latch plate in place
with two M6 screws.
10 ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 10. Installing the latch plate
Step 6. Install the upper air baffle.
Figure 11. Installing the upper air baffle
Remove the two screws that secure the rear cable access cover, and remove the cover.
Align the upper air baffle with the slot, and secure it with three screws.
hapter 2.Set up Rear Door Heat eXchanger V2 11

Step 7. Remove the four screws that secure the cable access bar, and remove the bar.
Figure 12. Removing the cable access bar
Step 8. Align the lower air baffle to the bottom cable slot, and secure it with four screws as illustrated.
Figure 13. Installing the lower air baffle
Step 9. Secure the bottom hinge assembly to the rack cabinet with eight screws.
12 ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 14. Installing the bottom hinge assembly
Step 10. Face the bottom side of the carton, remove the carton top, and slit the two carton corners on your
right-hand side with a knife. Then, fold the right carton panel down to the ground, and rotate the
threes carton inserts down.
hapter 2.Set up Rear Door Heat eXchanger V2 13

Top
Bottom
Figure 15. Unpacking the heat exchanger
Step 11. With three people, rotate the heat exchanger to vertical on the three carton inserts. Then, remove
the inner and outer hose access panels while one person hold the heat exchanger.
14 ThinkSystem Rear Door Heat eXchanger V2 User Guide

Figure 16. Removing the hose access panels
Step 12. Hold the heat exchanger with three people on the handles/spots as illustrated. Then, carefully lift
the heat exchanger and turn it upright.
Figure 17. Lifting the heat exchanger with three people
1 Handles that the first person hold on to 3 Spots that the third person hold on to
2 Handles that the second person hold on to
hapter 2.Set up Rear Door Heat eXchanger V2 15

Step 13. arry the heat exchanger with three people to the cabinet frame. Align the bottom corner with the
bottom hinge pin on the rack cabinet; then, lower the heat exchanger to fit the pin in.
Figure 18. Installing the heat exchanger to the rack cabinet
Step 14. Hold the heat exchanger in place with two people. Insert the top hinge bracket pin to the heat
exchanger; then, secure the bracket with three screws.
16 ThinkSystem Rear Door Heat eXchanger V2 User Guide