Data Sheet

Technical System Catalogue/Climate control
Cooling units
3 - 18
Selection criteria
Enclosure climate control places ever greater demands on
integration and adaptation to the local conditions and the
existing 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 5, calculation bases)
 What ambient conditions are anticipated (max. ambient
temperature 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, unvented rooms, air/water heat exchangers should
be used.
In order to ensure the proper use of enclosure cooling units,
the following points should be observed:
1. The unit must only be installed and opened by author-
ised, expertly trained personnel.
2. Choose a location for the cooling unit which ensures
excellent ventilation. The site must be free from exces-
sive contamination and moisture. For example, the
atmosphere must not contain any conductive dusts or
corrosive media.
3. The mains connection data (connection voltage and fre-
quency) 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 advis-
able.
4. The prescribed electrical protection devices must be
connected upstream of the unit. No additional tempera-
ture control may be connected upstream of the unit 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
electromagnetic 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 pointed directly at elec-
tronic components, to prevent the formation of conden-
sation.
10. The unit must only be installed horizontally, in accord-
ance with the prescribed installation position. The maxi-
mum 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 enclo-
sure must not exceed the specific useful cooling output
of the cooling unit.
14. The installation instructions contained in the cooling unit
manual must be observed in full.
Appropriate use of enclosure cooling units