Asetek InRackCDU Installation, Operation & Maintenance Guide 4
The CDU Cabinet also comes with a monitoring system that monitors the following.
Facility liquid temperature – Supply & Return
Server liquid temperature – Supply & Return
Facility liquid pressure
Facility liquid flow rate
Server liquid pressure
Coolant reservoir level
Heat load
Leak detection (inside cabinet)
Dew point control (optional)
The monitoring system is capable of sending out email alerts and alarms at user-defined thresholds and
communicates to with DCiM (Data Center Infrastructure Management) or DCM (Data Center
Management) systems via SNMP.
1.2
Coolant Distribution Manifold (CDM)
The CDMs mount like zero-U PDUs in the space at the hot aisle end of the rack. CDMs are delivered in
pairs, one supply (cold, with blue quick connectors) and one return (hot, with red quick connectors). CDMs
deliver cool coolant from the CDU cabinet to the server liquid coolers and return heated coolant from the
server coolers to the CDU cabinet.
1.3
Facilities Hoses
Facilities hoses connect the CDU cabinet to the facilities water system. This system may be located under
a raised floor or above the rack, typically above the hot aisle. Connection to the facilities liquid system is
made via Camlock fittings. Camlock fittings are a globally-available, tool-less connection system where the
dimensions of the matting ends are governed by international standards, allowing a male Camlock
purchase on one continent to mate seamlessly with a female Camlock purchased on another continent.
