Unit installation

CDU Installation Guide Page 15
Cooling Distribution Unit
INSTALLATION (continued)
4.4 Heat Transfer Fluids
The CDU cabinet is designed for use with a primary circuit supply of plain water or up to 30%
glycol/water from by a site chilled water ring main or a dedicated chiller - a 30% glycol concentration
will give protection to approx -14°C (7°F).
The secondary circuit should be filled with particulate free deionized water treated with suitable
corrosion inhibitors and preservatives.
For ease of installation and commissioning, premixed treated water designed specifically for the
requirements of closed secondary cooling circuits can be offered as an optional kit. Failure to use
proper water treatment may result in decreased system performance and reliability due to corrosion,
scaling, fouling and microbiological growth.
4.5 Flushing
Where an under floor manifold is installed, provision should be made for flushing connections.
4.6 Door Lock Details
The swing handle locks fitted to both front and rear doors have combination lock as standard, which
can be set as below:
To set a new code
1) Make sure the thumb wheels are in the original factory set position ‘000’.
2) Using a sharp pointed object, push the tip into the small round hole located at
the bottom of the lock.
3) Turn the 3 wheels to your new required combination and release tip.
To reset again, turn combination to your new code then follow steps 2-3.
*NOTE*: Always keep a record of your new code – once lost there is no override facility! The master
key provided will always override the combination lock, but will not reset the combination.