Unit installation

CDU Installation Guide Page 25
Cooling Distribution Unit
6.1 Controller Introduction
The CDU controller has been designed to control the supply of cooling water to up to 6 RDHx’s in
unattended IT environments. Cooling water is supplied and controlled to a predefined set point at a
controlled flow rate.
When power is first applied to the unit using the control panel disconnect (isolator) switch, the main
red ‘Power On’ lamp will illuminate, the inverter drive will energize and the graphic display area of the
controller will light up.
The display will show the manufacturer’s logo for a few seconds while the controller goes through an
initiation cycle. During this time the control valves may cycle open/closed – this is normal.
Warning = non-urgent warning alarm (investigate on routine inspection/maintenance)
Alarm = urgent alarm (requiring immediate attention)
See Section 8.1 for explanation of events.
* Screen shots throughout this guide are shown in SI units only.
OPERATION
Section 6
* Graphical
display area
Power On
indicator (red)
Warning indicator
(flashing amber)
Alarm indicator
(flashing red)
Arrow buttons
For menu navigation
and value adjustment
OK button
To enter or accept the
displayed value or command
& to acknowledge alarms
ESC button
To return to System
(default) Screen in a series
of steps back through menu
structures
Graphical Display and Keypad
set point 18.0°C
dw o/r .0°C
act. temp 18.4°C
14/07/09 08:30