INSTALLER
29
WATER IN CENTRAL HEATING SYSTEMS
INTRODUCTION
It is ABSOLUTELY NECESSARY to treat the water system
for the heat generator to work properly and to guarantee
its service life together with all its components.
This not only applies to jobs carried out on existing instal-
lations but also on new installations.
Sludge, lime-scale and pollutants present in the water
can cause permanent damage to the heat generator, also
within a short time and regardless of the quality standards
of the materials used.
For additional information regarding the type and the use
of additives contact the Technical Assistance Centre.
b Always comply with the legislation applicable in the
country of installation.
THE WATER IN THE HEATING SYSTEMS.
INSTRUCTIONS FOR THE DESIGN, INSTALLATION AND MANAGEMENT OF THE HEATING SYSTEMS.
1. Chemical and physical characteristics
The chemical and physical characteristics of water used in central heating systems must conform to the requirements of
EN 14868 standard and to the following tables:
ALUMINIUM BOILERS
with furnace power < 150 kW
Initial filling
water
Regular
service water
(*)
ph 6-8 7–8
Hardness °fH < 10° < 10°
Electrical
conductivity
μs/cm < 200
Chlorides mg/l < 25
Sulphides mg/l < 25
Nitrides mg/l < 25
Iron mg/l < 0,5
ALUMINIUM BOILERS
with furnace power > 150 kW
Initial filling
water
Regular
service water
(*)
ph 6-8 7–8
Hardness °fH < 5° < 5°
Electrical
conductivity
μs/cm < 150
Chlorides mg/l < 15
Sulphides mg/l < 15
Nitrides mg/l < 15
Iron mg/l <0,5
(*) values for water in system after 8 weeks of operation
General note on water used to top up systems:
- if softened water is used to top up a system, after 8 weeks verify that the water in the system respects the above limits,
in particular for electrical conductivity
- These control are not necessary if demineralised water is used
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