See this topic to learn how to fill ThinkSystem Rear Door Heat eXchanger for 48U Rack with water.
About this task
S038![Use eye protection](use_eye_protection-126.png)
Eye protection should be worn for this procedure.
Wear safety goggles or other eye protection whenever you fill, drain, or purge air or nitrogen from the heat exchanger.
Procedure
- Purge the nitrogen that has been filled in the hose from the hose.
Figure 1. Purging nitrogen![](hdc021-400.png)
Loosen and remove the cap from the air-purging valve.
Press in on the valve stem of the air-purging valve to purge the nitrogen from the heat exchanger. Continue holding in the valve stem until the pressure is released.
- Attach the air-purging tool to the air-purging valve at the top of the heat exchanger, and place the drain end into a 2-liter (or larger) container to catch the water and air bubbles that escape during the filling procedure.
Figure 2. Installing the air-purging tool![](hdc026-500.png)
- Connect the supply and return hose couplings with the manifolds.
Figure 3. Connecting manifolds![](sd650v2_435-300.png)
- Turn on the flow of water to the heat exchanger, and let it run for several minutes.
- When there is a steady stream of liquid into the container from the air-purging tool, disconnect the tool from the heat exchanger.
If water drips from the air-purging valve after you remove the air-purging tool, reattach the tool and disconnect it again to seal the valve.
Figure 4. Removing the air-purging tool![](hdc027-400.png)
- Install the valve cap back to the air-purging valve.
Figure 5. Installing the valve cap![](hdc038-400.png)