Unit installation

CDU Installation Guide Page 13
Cooling Distribution Unit
4.1 Mechanical
Arrival on site: The CDU cabinet is crated and dispatched on a load bearing pallet. On arrival at site
the top and side panels of the crate and the protective bubble wrap should be removed and the
cabinet inspected for any transit damage. If damage is found, it must be reported to the manufacturer
immediately.
The cabinet can be wheeled off the pallet using the crate front as a ramp, or may be removed using a
forklift, which can then be used to transport the unit to its final destination. The cabinet must be kept
within 15° of vertical at all times.
Note: Care should be taken when using a forklift or pallet truck to avoid damaging the drain/sump
point under the middle/front of the unit.
The CDU cabinet is intended for positioning on a smooth and level floor, ideally a raised with at least
300mm (12”) under floor space for hose runs to data rack RDHx’s. For ease of positioning, the unit is
supplied with load bearing wheels. Sufficient space should be allowed at the front and rear of the unit
to fully open the access doors, i.e. in excess of 800mm (31½”). Once in position the corner plinths
supplied loose with the cabinet may be bolted to the underside of the cabinet as shown in Fig.1 and
the unit then raised & levelled with the levelling feet. Plinth covers are also supplied for front and sides
(but not the back to keep area clear for hose runs).
The keys for front & rear doors are supplied in a bag secured to the front door.
4.2 Electrical
A 25mm (1”) cable gland is provided in the underside of the electrical box to accept a 9-17mm (⅜”-⅝”)
diameter power cable. The incoming cable may be routed into the cabinet either via the floor void or
through the cabinet roof panel. Termination point is at the main electrical box disconnect (isolator) and
adjacent ground (earth) terminal. Recommended cable size is 4-core 2.5mm
2
(13AWG) minimum.
Upstream protection must be provided by the end user as stipulated on the wiring diagram in the form
of fuses.
Note: The CD120W4 & CD150W4 units are supplied configured for 380-415v 3-phase supply as
standard. If the supply voltage is higher (e.g. 460-480v), then the 400v wire tapping on the control
transformer should be moved to the 460v tapping (see Fig.2) and the thermal overloads reset for 5.7A
(see wiring diagram).
The CD120W3 & CD150W3 units are supplied configured for 208v supply.
In order to maintain the UL listing of the CDU, type RK5 fuse protection must be installed upstream of
this unit, as specified on sht.3 of the CDU wiring diagram (see page 54).
Terminals nos. 1 to 2 and 3 to 4 in the electrical box (supplied linked) can, if required, be connected to
a remote ‘Control Switch’ and building ‘EPO/Fire shut down system’. Breaking either of these circuits
will shut the unit down in an emergency (refer to wiring diagram).
INSTALLATION
Section 4
Fig. 1 - View on underside of CDU
form front showing corner plinth
positions (shown in green).