IBM Rear Door Heat eXchanger V2, Installation And Maintenance Manual

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Draining the heat exchanger
Perform this procedure before you have the heat exchanger removed from the rack
or when you are directed to do so by an IBM service representative. The drain
valve is at the bottom of the heat exchanger, near the supply and return couplings.
Attention: Wear safety goggles or other eye protection whenever you fill, drain, or
purge air from the heat exchanger.
To drain water from the heat exchanger, complete the following steps:
1. Shut off the flow of water at the source. Depending on your facility, this might
mean turning off the pump unit, closing a valve at the pump unit, or a similar
action.
Note: Although the likelihood of water exposure is small, you might prefer to
place some water-absorbent material beneath the door assembly as a
general practice when you drain the heat exchanger.
2. Remove the inner hose access panel from the inside of the heat exchanger.
Inner hose
access panel
Figure 45. Removing the inner hose access panel
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Rear Door Heat eXchanger V2: Installation and Maintenance Guide