KKT cBoxX 30 - Ambient Temperature; Effect of Surrounding Air Flow; Minimum Clearances; External Attachments

46 / 89 83000102.Ki
Table 14: Minimum volume of the installation room with regard to maximum refrigerant
concentration in case of a leakage if installed indoors
cBoxX chiller
30
40
50
60
70
80
90
100
120
160
180
200
Minimum
volume of the
installation room
(in m³)
14
14
14
16
20
20
20
20
40
40
55
55
6.2.3. Ambient temperature
The chiller is cooled by the ambient air and the lower the temperature of this cooling air the more
economically the chiller works. Direct sunshine or exhaust air from other machines heats up the
surrounding air and must be taken into account when installing the chiller. Preference is for a
shaded installation. The maximum ambient temperature is given in the technical data.
6.2.4. Effect of surrounding air flow
The chiller emits heat to the surrounding area, the machine also draws in cooling air. The
machine controls the quantity of cooling air automatically via the speed of the fan. Air currents
surrounding the machine, such as the wind, can affect this control and endanger operation of the
machine. If a constant direction of an air current is known at the installation site, this should not
be directed at the air intake side of the chiller.
6.2.5. Minimum clearances
The minimum clearances around the machine are made up of service clearances and clearances
to ensure optimum air supply. On the one hand accessibility must be ensured from all sides, in
addition, an unhindered, sufficient quantity of cooling air must be able to be drawn in and blown
out upwards. If the minimum clearances are not complied with there is a risk of an air short-circuit
between the air intake and discharge side. As regards to the minimum clearances please refer to
Annex III.
6.2.6. External attachments
In general a free pressure (compressive force) of 5 Pa is available for external attachments.
Malfunctions can be caused if this is not adhered to. Figure 15 shows a layout with which you
can implement a system with rectangular ducts while complying with the free pressure. The duct
system consists of a straight piece of duct [1], a 90° elbow bend [2] and another straight piece
of duct [3].
The ducts are made of sheet steel, the duct cross-section must be adjusted to the machine base
area (footprint). The straight pieces of duct [1] and [3] are each no longer than 2 metres. The
90° elbow [2] has a pressure loss coefficient of ζ ≤ 0.2. The system designer is responsible for
the sealing and mechanical fixing of external attachments.