CHOOSING A PREVENTION METHOD
The fill and make-up water must be softened where necessary to within
the recommended range. Additives can be added to keep the limestone
in solution in the water. ACV recommends Fernox (www.fernox.com)
and Sentinel (www.sentinel-solutions.net) additives.
Please note that these additives must be used in accordance with the
instructions issued by the manufacturer of the water treatment product.
The water hardness must be checked regularly and the values entered
in the service log.
OTHER PARAMETERS
In addition to the oxygen and the water hardness, other parameters of
the water in the heating systems must be checked:
Acidity
6.6 < pH < 8.5
Conductivity
< 400 μS/cm (at 25°C)
Chlorides
< 125 mg/l
Iron
< 0.5 mg/l
Copper
< 0.1 mg/l
These parameters must be measured and the water must be treated
if these values are outside the range. ACV recommends Fernox (www.
fernox.com) and Sentinel (www.sentinel-solutions.net) additives.
Please note that these additives must be used in accordance with the
instructions issued by the manufacturer of the water treatment product.
CLEANING THE SYSTEM
Before the system is filled, it must be cleaned in accordance with
standard EN14868. Chemical cleaning agents can be used. ACV
recommends Fernox (www.fernox.com) and Sentinel (www.sentinel-
solutions.net) additives.
Please note that these additives must be used in accordance with the
instructions issued by the manufacturer of the water treatment product.
If any of the recommendations cannot be followed, the
boiler must be hydraulically separated from the system
by a plate type heat exchanger.
GENERAL
The fill water contains elements likely to damage the exchanger of a
boiler if the concentration is outside the appropriate range.
The risk increases with the size of the system because the quantity of
water in the circuit increases depending on the installed capacity. To
cover these risks in a cascade installation, ACV demands the installation
of a plate type heat exchanger between the boilers and the heating
circuit.
PREVENTION PRINCIPLES
OXYGEN
Depending on the volume of water in the heating circuit, a certain
amount of oxygen is introduced when the installation is filled. During
operation, a little oxygen is added if the water is topped up and/or
through the walls of the hydraulic components without an oxygen
barrier (PE pipes & connections).
Oxygen corrodes the steel and generates sludge. ACV HeatMaster heat
exchangers are made of stainless steel and are therefore insensitive
to corrosion. However, the sludge produced by the corrosion of the
components in the system made of ordinary steel (radiators, etc.) will
be deposited on the hot surfaces, including those inside the exchanger.
These deposits in the heat exchanger reduce the water flow rate and
thermally insulate the exchange surfaces, which is likely to damage
them.
ENSURING PROTECTION AGAINST OXYGEN
- Mechanical process: a deaerator combined with a desludger installed
according to the manufacturer’s instructions effectively reduces the
effects of oxygen on the installation;
- Chemical process: additives keep the oxygen in solution in the water.
ACV recommends Fernox (www.fernox.com) and Sentinel (www.
sentinel-solutions.net) additives.
Please note that these additives must be used according to the
instructions issued by the manufacturer of the water treatment
product.
WATER HARDNESS
Depending also on the volume of water in the system, the water
hardness and the fill frequency, a certain amount of limestone gets
into the circuit. The resulting fur is deposited on the hot surfaces,
including those inside the heat exchanger, reducing the passage of
water and thermally insulating the active surfaces of the exchanger. This
phenomenon can damage the heat exchanger.
In order to maintain the performance levels of your
HeatMaster® in professional installations, we recommend
softening the water if the hardness is above 20°fH.
Water hardness
°fH
°dH
mmolCa(HCO3)
2
/l
Very soft
0 - 7
0 - 3.9
0 - 0.7
Soft
7 - 15
3.9 - 8.4
0.7 - 1.5
Fairly hard
15 - 25
8.4 - 14
1.5 - 2.5
Hard
25 - 42
14 - 23.5
2.5 - 4.2
Very hard
> 42
> 23.5
> 4.2
WATER QUALITY
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