5 Installation
EN
10
Rittal HD air/water heat exchangers
should not be allowed to increase excessively due to the
evaporation of large quantities of water, since electrical
conductivity increases as the concentration of dissolved
substances rises, and the water thereby becomes more
corrosive.
Always add the appropriate volume of fresh water.
Always remove part of the enriched water.
The following criteria for the cooling water must be ob-
served:
– Water with high gypsum content is unsuitable for cool-
ing purposes because it has a tendency to form boiler
scale that is particularly difficult to remove.
– The water quality should comply with the hydrological
parameters specified in section 13 "Hydrological da-
ta".
– At best, organic substances should only be present in
small quantities, because otherwise sludge deposits
and microbiological contamination may occur.
5.4.2
Preparation and maintenance of the water
in recooling systems
Depending on the type of installation to be cooled, cer-
tain requirements are placed on the cooling water with
respect to purity. According to the level of contamination
and the size and design of the recooling systems, a suit-
able process is used to prepare and/or maintain the wa-
ter.
The most common types of contamination and most fre-
quently used techniques to eliminate them in industrial
cooling are:
5.5
Electrical connection
5.5.1
Notes on electrical installation
When carrying out the electrical installation, observe all
applicable national and regional regulations as well as
the regulations from the responsible utility company.
The electrical installation must comply with EN 61 439
and may only be carried out by a qualified electrician
who is responsible for compliance with the applicable
standards and regulations.
Connection data
– The connected voltage and frequency must corre-
spond to the values stated on the rating plate.
– No additional temperature control may be connected
upstream of the unit at the supply end.
– The mains connection must ensure low-noise poten-
tial equalisation.
Overvoltage protection and supply line load
– The unit does not have its own overvoltage protection.
Measures must be taken by the operator at the supply
end to ensure effective lightning and overvoltage pro-
tection. The mains voltage must not exceed a toler-
ance of ±10%.
Install the pre-fuse specified on the rating plate to pro-
tect the cable and equipment from short-circuits.
Select a suitable motor circuit-breaker in accordance
with the information specified on the rating plate: Set
it to the rated current.
This will achieve the best short-circuit protection for
cables and equipment.
5.5.2
Potential equalisation
If, for EMC reasons, the unit is to be integrated into the
customer's existing potential equalisation system, a
conductor can be connected to the potential equalisa-
tion connection point. The connection point is marked
with a schematic symbol.
5.5.3
Install the power supply
Connect the unit to the power supply voltage, observ-
ing the terminal labelling.
Fig. 11:
Wiring plan 3214.700 and 3215.700
Strain relief
Take the cable tie from the dispatch bag and insert it
into the designated hole in the unit.
Contamination of the
water
Procedure
Mechanical contamination
Filter the water using:
– Mesh filter
– Gravel filter
– Cartridge filter
– Precoated filter
Excessive hardness
Soften the water via ion ex-
change
Moderate content of me-
chanical contaminants and
hardeners
Addition of stabilisers and/
or dispersing agents to the
water
Moderate levels of chemical
contaminants
Addition of passifiers and/or
inhibitors to the water
Biological contaminants,
such as slime bacteria and
algae
Addition of biocides to the
water
Tab. 3:
Contaminations and techniques used to eliminate them
Note:
According to the standard, the PE conductor
in the mains connection cable is not classified
as an equipotential bonding conductor.