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Operating and Maintenance Instructions – 6 Installation – "Getting Started"
Rittal Liquid Cooling Package Plus
Notes on water quality
For safe operation, it is vital that the VBG guidelines on cooling water are ob-
served (VGB R 455P). Cooling water must not contain any limescale deposits
or loose debris, and it should have a low level of hardness, particularly a low
level of carbonate hardness. For recooling within the plant, the carbonate hard-
ness should not be too high. On the other hand, however, the water should not
be so soft that it attacks the operating materials. When recooling the cooling
water, the salt content should not rise too high as the result of evaporation of
large quantities of water, since electrical conductivity increases as the concen-
tration of dissolved substances rises, and the water thereby becomes more
corrosive. For this reason, it is not only always necessary to add a correspon-
ding quantity of fresh water, but also to remove part of the enriched water. Gyp-
siferous water is unsuitable for cooling purposes because it has a tendency to
form boiler scale, which is particularly difficult to remove. Furthermore, cooling
water should be free from iron and manganese, because deposits may occur
which settle in the pipes and block them. At best, organic substances should
only be present in small quantities, because otherwise sludge deposits and mi-
crobiological contamination may occur.
Note:
To avoid frost and corrosion damage as well as biological contaminants, Rit-
tal GmbH & Co. recommends that a water/glycol mixture be used up to max.
30% glycol.
Note:
The Liquid Cooling Package Plus is secured against excess pressure as re-
gards a maximum permissible pressure (PS) of 8 bar if no cooling medium
liquid is trapped. If shut-off valves that could cause cooling medium liquid
getting trapped are installed on site, pressure relief vessels with safety val-
ves (8 bar blowing-off pressure) must be built into the coolant circuit of the
recooling system.
Note:
Before operation with water is started, all supply lines must be adequately
flushed.
Rittal GmbH & Co. KG also recommends the implementation of a magnetic
filter in the cooling water flow for each Liquid Cooling Package or a central
magnetic filter to avoid devices becoming contaminated with suspended
matter and impurities containing ferrite.
Note:
To avoid the loss of fluids due to diffusion (open and closed systems) or eva-
poration (open systems), it is recommended to employ automatic filling.
