Unit installation

CDU Installation Guide Page 17
Cooling Distribution Unit
5.1 Pre-Commissioning Checks
Check that all items within the unit are secure and undamaged. Pay particular attention to the
pipework.
Inspect all wiring and check that all terminations are tight, especially any ground (earth)
connections.
Ensure that the power supply is correctly connected – see wiring diagram/data plate for rating.
Check the required number of RDHx has been correctly piped up via quick release couplings
to the supply and return manifolds (if fitted) in the cabinet and all hose connections are tight.
Where the optional manifold is installed, fully open the automatic flow balancing valves on the
supply manifold (blue handles) for each RDHx connected.
Check that the primary chilled supply is connected and hose connections are tight.
Check that drain point on the drip tray sump is capped and all drain valves are closed (see
Fig. 9 on page 40).
Check that fuse rating of the power supply is in accordance with the recommendations on the
wiring diagram and motor overload devices are set as per the wiring diagram.
Ensure that cooling water supply does not exceed 10Bar (145PSI) pressure.
Ensure the bleed screws on the four automatic air vents are loose but have not been removed
(see Front View image on page 7 for identification).
Remove pump transit bracket (this is optional and can be left in position if preferred).
5.2 Chilled water
Crack open the inlet and return ball valves fitted at the back of the CDU cabinet (see Fig. 4) to allow the
primary circuit within the cabinet to gently fill from the chilled water supply. The trapped air in this circuit
may be expelled using the manual air bleed valve situated on top of the pipe at the primary entry into the
plate heat exchanger. Once the circuit is filled, the ball valves may be opened fully. Check for leaks.
5.3 Controller Setup
NOTE: This operation and the following (5.4) will already have been carried out at during the factory test and
will only need to be repeated after a software upgrade.
The power supply may now be switched on using the disconnect (isolator) on the control panel.
Refer to Section 6.1 for a description the screen display and general controller information. Before
actually starting the unit, it will be necessary to setup the controller for the number of RDHx’s attached.
This will then automatically select various software parameters to suit the installation.
To adjust the rack number:
Press keys & together for 1 to 2 seconds to enter the next screen from the welcome screen.
Scroll to ‘Logon’ and press . Enter the ‘Service’ access code (5699) using keys and
press .
Scroll up to ‘Setup’ and press to display the screen below.
COMMISSIONING
Section 5
OK
OK
OK
Fig. 4 - Primary Connections
Primary return
ball valve
Primary inlet
ball valve