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Neptune DWC RM100 in-rack Coolant Distribution Unit
1. Product Description
1.1 General
This document describes the basic characteristics & operation of the RM100 Coolant Distribution Unit
(CDU) and the required ongoing maintenance considerations.
The CDU contains a Secondary closed loop circuit that provides a supply of cooling water to IT equipment,
either through indirect cooling (e.g. rack mounted rear door heat exchangers), or direct cooling (e.g. cold
plates at chip level).
The Secondary circuit loop is a low pressure sealed system with the heat removed from the high heat
density areas of IT equipment rejected to an external cooled water source (Primary circuit) via a low
pressure drop plate heat exchanger.
The Secondary circuit ensures that the cooling fluid in a data centre environment can be kept to a
minimum volume, is closely controlled for flow, pressure & temperature (with condensation control) and
can be accurately maintained for fluid quality (with filtration & additives).
The Primary cooling source can be a chilled water system (either dedicated or from building system), fluid
cooler, cooling tower or dry air cooler, depending on the desired Secondary temperature and heat transfer
duty (refer to Sections 2.6 & 2.7 of Application & Planning Guide for more information).
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CDU Operating & Maintenance Guide
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