Unit installation

CDU Installation Guide Page 7
Cooling Distribution Unit
2.1 General
This guide describes the basic Installation, Operation and Maintenance of the Cooling Distribution Unit
(CDU) and contains a detailed explanation covering the Technical Specification, Mode of Operation,
description of the alarms that can be generated and the action to be taken at those alarms, a Spare
Parts List and all relevant Schematic Diagrams.
It is assumed that the people involved with the maintenance of this unit are familiar with basic theory
and practice. Consequently only features that are of particular significance to this unit are identified.
The CDU has been designed to provide close controlled cooling water for IT enclosure ‘Rear Door
Heat Exchangers’ (RDHx’s), with a total maximum cooling capacity of 120 or 150kW.
The process side water loop (referred to as the ‘Secondary Circuit’) is a sealed pressurized system with
the heat extracted from the rear door heat exchangers being rejected to a chilled water circuit.
The chilled water can either be part of the Building Services Chilled Water system or supplied from a
dedicated chiller or cooling tower. This chilled water supply loop (referred to as the ‘Primary Circuit’) is
filtered to 300μ (50mesh) using a filtration unit fitted internally to the cabinet.
Features of the CDU include:
INTRODUCTION
Section 2
3
Front View
Control Panel
Pump Inverter Drive
Primary Control Valves
(run & standby)
Secondary Pumps
(run & standby)
Plate Heat Exchanger
Primary Flow Meter
Reservoir Tank
Pump Isolation Valves
Controller Display
(user interface)
Lockable Wheels &
Adjustable Plinth
Level Switch
Pump transit bracket
2
1
4
1
4
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Location of automatic air vents
&