Installation, Start-Up, Adjustment and Maintenance Manual
53
TYPE OF
APPROXIMATE PERCENTAGE OF ANTIFREEZE BY VOLUME
ANTIFREEZE
20 30 40 50
MONO-ETHYLENE
GLYCOL
16°F 4°F -12
°
F -35°F
Table 18
– FREEZING POINTS OBTAINED BY VARIOUS CONCENTRATIONS OF MONO-ETHYLENE GLYCOL
ANTIFREEZE
As other hydronic appliances, Robur heating and cooling systems operate with grid-water of good quality. In
order to prevent any possible problem of operation or reliability caused by filling or top-up water, please refer
to codes and norms about water treatment for thermo-hydraulic installations in civil or industrial applications.
Parameters indicated in Table 19 must be complied with.
CHEMICAL AND PHYSICAL PARAMETERS OF WATER IN HAETING/COOLING SYSTEMS
PARAMETER
UNIT OF MEASUREMENT
ALLOWABLE RANGE
pH \
>
7
(1)
CHLORIDES ppm
<
125
TOTAL HARDNESS (CaCO
3
) °f
<
15
IRON ppm
<
0.5
(1)
COPPER ppm
<
0.1
(1)
ALUMINIUM ppm
<
1
LANGELIER’S INDEX
\
0 – 0.4
HARMFUL SUBSTANCES
FREE CHLORINE
ppm
< 0.2
(1)
FLUORIDES ppm
<
1
SULPHIDES
ABSENT
(1)
In accordance and respecting current and local regulation
Table 19
– CHEMICAL AND PHYSICAL PARAMETERS OF WATER.
Water quality can be measured through parameters like acidity, hardness, conductivity, chlorides content,
chlorine content, iron content and the like.
WARNING
!!!
The presence of active chlorine in the water, in particular, can jeopardize parts of the
installation and Robur units. Therefore, please make sure that active chlorine content and total hardness are
compliant with the allowable ranges reported in Table 19.
The way the installation is operated can be the cause of possible degradation of water quality.
Moreover, abnormally massive water top-up or reintegration can cause a drift of chemical or physical above-
mentioned parameters. Reintegration should not exceed 5% per year of the total amount of water. It is
advised to check regularly the water quality, especially in case of automatic or periodic top-up.
In case water treatment is needed, this operation should be carried out by a professional or competent
person, following strictly the instructions by the manufacturer or supplier of the chemical substances for the
treatment, since dangers could arise for health, for the environment and for Robur appliances.
Several products for water treatment are available on the market.
In case washing of the pipes is needed, this operation should be carried out by a professional or competent
person, following strictly the instructions by the manufacturer or supplier of the chemical substances for the
washing, avoiding the use of substances aggressive for stainless steel or containing/releasing active
chlorine.
Please make sure the pipes are properly rinsed in order to remove any residue of chemical substances from
the pipes.
Robur is not liable for ensuring that water quality is always compliant with what reported in Table 19 is not’s.
Non-compliance with indications above may jeopardize the proper operation, integrity and reliability of Robur
appliances, invalidating the warranty.
For any further detail, please contact directly Robur Corporation Evansville, IN
Phone (812) 424-1800; Fax (812) 422-5117.
