Heating Water Recommendations; Generality; Principle Of Prevention; Installation Cleaning - ACV Solo 18 Installation, Operating And Servicing Instructions

heatIng Water recommendatIons

generalItY

Filling water contains elements susceptible to damage boilers heat exchangers
in case their concentration goes out of an adequate range.
The risk is growing with the size of the installation since the water content per
installed kW increases.

prIncIple of preVentIon

OxYgEN
Depending of the volume of the installation, a certain amount of oxygen is
introduced in the installation. During the exploitation of the installation, some
oxygen can be brought in the system in case of water re-filling and/or presence
of hydraulic components without oxygen barrier (PE tubes & connectors).
The oxygen reacts with the steel creating corrosion and generating sludges.
While the ACV Prestige heat exchanger is made of stainless steel and is by
consequent not sensible to corrosion, the sludges generated in carbon steel
part of the installation (radiators, ...) will lay down in the hot parts including
the heat exchanger.
The sludges in the heat exchanger have the effect to reduce the water flow rate
and to thermically insulate the active parts of the heat exchanger, what could
lead to damages.
HOw TO PREVENT AgAINST OxYgEN ?
- mechanical system : an air remover combined to a sludges remover installed
following the constructors specifications limits efficiently the risk of oxygen
in the installation;
- chemical system : additives allow the oxygen to stay in solution in the water.
ACV recommends the additives from Fernox (www.fernox.com) and from
Sentinel (www.sentinel-solutions.net).
note that these products must be used in strictly accordance with the water
treatment manufacturer's instructions.
HARDNESS
Depending of the volume of the installation, the hardness of water and the
possible re-filling, a certain amount of lime is introduced in the installation.
The lime will lay down in the hot parts, including the heat exchanger creating a
reduction of the water flow rate and a thermal insulation of the active parts of
the heat exchanger. That phenomena can damage the heat exchanger.
Acceptable hardness range:
mmolca(hco3) / l
2
0,5 - 1
HOw TO PREVENT ?
the filling and re-filling water must be softened if necessary to match the
working range. Additives can be used to keep the calc in solution in the water,
ACV recommends the additives from Fernox (www.fernox.com) and from
Sentinel (www.sentinel-solutions.net).
note that these products must be used in strictly accordance with the water
treatment manufacturer's instructions.
The water hardness must be check regularly and recorded in a file.
OTHER PARAmETERS
In addition to the oxygen and the hardness, some other parameters must be
controlled in the water of heating installations.
Acidity
Conductivity
Chloride
Iron
Cu
°dh °fh
2,5 - 5,6 5 - 10
6,6 < pH < 8,5
< 400 μS/cm (a 25°C)
< 125 mg/l
< 0,5 mg/l
< 0,1 mg/l
Those parameters has to be measured and water needs chemical treatment
in case of values out of range. ACV recommends the additives from Fernox
(www.fernox.com) and from Sentinel (www.sentinel-solutions.net).
Note that these products must be used in strictly accordance with the water
treatment manufacturer's instructions.

InstallatIon cleanIng

Before filling an installation, it must be cleaned following the standard
EN14868.
Chemical cleaners can be used, ACV recommends the additives from Fernox
(www.fernox.com) and from Sentinel (www.sentinel-solutions.net).
Note that these products must be used in strictly accordance with the water
treatment manufacturer's instructions.
In case at least one of those recommendations can
not be warranted, the boiler must be hydraulically
separated of installation using plate heat exchanger
EN • 13
664Y4200 • F