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6 Installation

Rittal Liquid Cooling Package

Notes on water quality

For safe operation, it is vital that the VBG guidelines on
cooling water are observed (VGB R 455P). Cooling
water must not contain any limescale deposits or
loose debris, and it should have a low level of hard-
ness, particularly a low level of carbonate hardness.
The carbonate hardness should not be too high, par-
ticularly for recooling within the plant. On the other
hand, however, the water should not be so soft that it
attacks the operating materials. When recooling the
cooling water, the evaporation of large quantities of
water must not lead to excessively high salt contents,
since electrical conductivity increases as the concen-
tration of dissolved substances rises, and the water
thereby becomes more corrosive. For this reason, not
only is it always necessary to add a corresponding
quantity of fresh water, but also to remove part of the
enriched water. Water with high gypsum content is un-
suitable for cooling purposes because it has a ten-
dency to form boiler scale that is particularly difficult
to remove. Furthermore, cooling water should be free
from iron and manganese, because deposits may oc-
cur which settle in the pipes and block them. At best,
organic substances should only be present in small

quantities, because otherwise sludge deposits and
microbiological contamination may occur.

6.1.3

Connecting the condensate discharge

Any condensate which may develop is collected in the
condensate collecting tray (fig. 46, item 1) in the water
module of the Liquid Cooling Package.

Fig. 46:

Condensate discharge

Key

Condensate collecting tray

Leakage sensor

Condensate discharge

The Liquid Cooling Package is additionally equipped
with a condensate discharge (fig. 46, item 3) via

Note:
Immediately after connecting the water cir-
cuit, the flow rate may be monitored by fitting
the device with an optional display with
touch function. To do this, first check wheth-
er the control valve is completely open (see
section 9.2.3 "Operation in stand-alone
mode"). If the control valve is closed or only
partially open, it can be opened in manual
mode via the web interface (see section
9.5.4 "Config").

Note:
The pipework in the building should be de-
signed according to the Tichelmann Princi-
ple in order to maintain a hydraulically
balanced system.
If this is not the case, the flow volume of each
Liquid Cooling Package must be assured by
using a flow quantity regulator.

Ideally, the Liquid Cooling Package is con-
nected to the cooling water system using a
water/water heat exchanger.
Pros:
– Reduction of water volumes in the second-

ary circuit,

– Setting of a defined water quality,
– Setting of a defined input temperature and
– Setting of a defined volumetric flow.

Note:
The Liquid Cooling Package is secured
against excess pressure as regards a maxi-
mum permissible pressure (PS) of 6 bar if no
cooling medium liquid is trapped. If shut-off
valves that could cause cooling medium
liquid to become trapped are installed on
site, pressure relief vessels with safety
valves (6 bar blow-off pressure) must be
built into the coolant circuit of the recooling
system.

Note:
Before commencing operation with water, all
supply lines must be adequately flushed.

Note:
To avoid the loss of fluids due to diffusion
(open and closed systems) or evaporation
(open systems), the use of automatic filling is
advisable.

Note:
The 2-way control valve used in the device is
opened at zero current.