Rittal HD air/water heat exchangers
9
5 Installation
EN
Tighten the union nut of the pipe until a noticeable in-
crease in force becomes necessary.
Fig. 9:
Connecting the water connection
Fig. 10:
Attaching a water pipe connection
5.4.1
Notes on water quality
To ensure the reliable operation of the above-mentioned
units, the VBG guidelines for cooling water must be ob-
served (VGB R 455 P).
The cooling water must not contain any limescale de-
posits; in other words, it should have a low level of hard-
ness, in particular, a low level of calcium hardness. In
particular, for recooling within the plant, the calcium
hardness should not be too high. On the other hand, the
water should not be so soft that it attacks the materials.
When recooling the cooling water, the salt content
Attention!
To establish a tight tubular threaded
connection, the user must employ suita-
ble sealing measures (e.g. use of a pipe
sealing cord or a sealing compound).
The blue ring does not act as a seal for
the internal water circuit. Its purpose is
instead to ensure compliance with all hy-
giene-related regulations.
Note:
When loosening and tightening a fixed pipe
connection, it is imperative to hold the HD fit-
ting on the unit side in place with a second
open-ended wrench (22 mm). Otherwise, the
connection in the device could leak.
Hygiene risk!
If the unit is installed in a food area as defined
by DIN EN 1672-2, all fittings used must be
hygiene-compliant (in terms of material and
the exclusion of cracks and gaps).
To ensure a flush joint, the pipe side of the
screwed connection must possess the same
external diameter as the HD fitting mounted
on the unit (24 mm).
Note:
The water circuit should be protected from
ingress of dirt or excess pressure (maximum
permitted operating pressure 10 bar)!
Observe the flow direction and check for
leaks!
The units do not have any separate ventila-
tion. For pressure-sealed systems, install the
appropriate ventilation equipment on the wa-
ter side.
Warning!
Switch off the power supply to the air/
water heat exchanger before working on
the water circuit and take suitable pre-
cautions against it being accidentally
switched on again.
Attention!
Volumetric flows > 400 l/h may cause
damage to the device. Suitable meas-
ures should be taken to regulate the vol-
umetric flow, such as flow regulator
valves (Model Nos. 3301.930/.940,
3201.990). Damage caused by excessive
volumetric flows will not be covered by
Rittal's warranty.