Unit installation

CDU Installation Guide Page 39
Cooling Distribution Unit
PREVENTATIVE MAINTENANCE
7.1 General
The CDU should be cleaned on a regular basis and checked for leaks and malfunctions.
DANGER: Before starting any maintenance work inside the cabinet, ensure that the unit is
electrically isolated/disconnected.
7.2 At 3 Months (or less)
Flush out or replace the strainer element on the cooling water inlet (see Section 7.5).
Check for any abnormal noises from the pump(s)
Check contents of flexible water make-up container and top up if necessary with deionized
water pre-treated with inhibitor/biocide.
Check for leaks
7.3 At 6 Months (or less)
In addition to the 3 monthly checks:
Check condition of hoses
Check all hose connections for tightness.
7.4 At 12 Months (or less)
In addition to the 3 & 6 monthly checks:
Check all bolts and seals
7.5 Filter Flushing
The primary filter can be flushed while the system
is operational - check the valve located on the
bottom of the filter bowl is closed (handle at 90° to
valve body) then remove the cap on the end of
the valve. Screw on the drainage hose *supplied
(see Fig. 8), using sealing washer and place free
end of hose into a bucket or similar. Open the
filter bowl valve to allow the water flowing through
the filter to wash over the filter surface & remove
debris out through the hose into the bucket.
Flushing out no more than 5L (1.3USgall) of fluid
should be sufficient for filter screen cleaning. This
is fairly straight forward for the primary circuit, as
the water lost will be quickly replenished by the
chiller make-up system.
*Drain hose is supplied coiled and cable tied to the pipework adjacent to the Secondary filter.
MAINTENANCE
Section 7
Remove cap
Fit hose
Fig. 8 - Flushing Connection