Specifications

Selection criteria
Cooling units
33Rittal System Climate Control
Enclosure climate control poses escalating demands on inte-
gration and adaptation to the local conditions and the exist-
ing process control and monitoring system. Rittal offers the
right solution to suit every requirement.
When selecting the appropriate cooling unit for your enclo-
sure, please observe the following points:
● What is the installation type to IEC 890?
(see page 27, calculation bases)
● What ambient conditions are anticipated (ambient temper-
ature and humidity)?
● What is the required maximum internal temperature of the
enclosure (T
i
)?
● What is the heat loss from electronic components inside
the enclosure?
● Is there a requirement regarding the protection category to
EN 60 529/IEC 529?
● What type of ambient pollution, such as dust, oil and
chemicals, are the cooling units exposed to?
● For bayed enclosure suites, the output irradiated from
neighbouring units may also need to be taken into
account.
● Good ventilation should be ensured at the site of installa-
tion (for example, the heat dissipated by the cooling unit
may cause a significant rise in the temperature of small
rooms).
● Particularly with poor ambient conditions, such as dirt or
small rooms, air/water heat exchangers should be used.
Proper use of enclosure cooling units
In order to ensure the proper use of enclosure cooling units, the fol-
lowing points should be observed:
1. The unit must only be installed and opened by authorised,
expertly trained personnel.
2. Choose a location for the cooling unit which ensures excellent
ventilation. The site must be free from excessive contamination
and moisture. For example, the atmosphere must not contain
any conductive dusts or corrosive media.
3. The mains connection data (connection voltage and frequency)
specified on the rating plate must be observed. In the case of
400 V, 2~ cooling units, we recommend the use of transformer
circuit-breakers, and for three-phase units, the use of motor
circuit-breakers is advisable.
4. The prescribed electrical protection devices must be con-
nected upstream of the unit. No additional temperature control
must be connected upstream of the device at the supply end.
The pre-fuse specified on the rating plate should be provided
as line protection. Observe the locally valid regulations when
installing.
5. Where a door contact switch is used, a shielded cable should
be used in environments with increased levels of electromag-
netic interference.
6. The temperature range specified on the rating plate must be
observed when operating the cooling unit, both indoors and
outdoors.
7. The enclosure must be sealed on all sides (IP 54).
8. The air inlet and outlet openings in the internal circuit of the
cooling unit must not be obstructed.
9. The cold air flow should not be directed straight at electronic
components, to prevent the formation of condensation.
10. The unit must only be installed horizontally, in accordance with
the prescribed installation position. The maximum permissible
deviation from the horizontal is 2˚.
11. After disconnecting from the supply voltage, the cooling circuit
of the cooling unit must not be switched back on for at least
5 minutes.
12. The customer must not make any modifications to the cooling
unit.
13. The heat loss of the components installed in the enclosure must
not exceed the specific useful cooling output of the cooling unit.
14. The installation instructions contained in the cooling unit man-
ual must be observed in full.
Important
4.2