Water In Heating Circuits - Riello TAU 55 UNIT Installation And Maintenance Manual

WATER IN HEATING CIRCUITS

INTRODUCTION
Water used in central heating systems MUST be suitably
treated to ensure the correct functioning of those systems
and to guarantee an extended working life for boilers and
all other system components.
This applies not only to existing systems but to newly
installed systems too.
Sludge, limescale and other contaminants in water can
cause irreversible damage to boilers even in relatively
short times, and despite the use of top quality materials
in their manufacture.
Contact RIELLO's Technical Assistance Service for fur-
ther information on water additives and their use.
WATER IN CENTRAL HEATING SYSTEMS:
INSTRUCTIONS FOR THE DESIGN, INSTALLATION AND MANAGEMENT OF CENTRAL HEATING SYSTEMS
1. Chemical and physical characteristics of water
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:
with furnace power < 150 kW
pH
Hardness °fH
Electrical
μS/cm
conductivity
Chlorides mg/l
Sulphides mg/l
Nitrides mg/l
Iron mg/l
(*) values for water in system after 8 weeks of functioning
General note on water used to top up systems:
- If softened water is used to top up a system, 8 weeks of functioning after topping up, verify that the water in the system
respects the above limits, in particular for electrical conductivity.
- This check is not necessary if demineralised water is used to top up the system.
24
INSTALLER
STEEL BOILERS
Water used for Water with system
first filling operating (*)
6-8 7,5-9,5
< 10 < 10
< 150
< 20
< 20
< 20
< 0,5
b
Always conform to the standards and legislation
applicable in the country of installation.
STEEL BOILERS
with furnace power > 150 kW
Water used for
first filling
pH
Hardness °fH
Electrical
μS/cm
conductivity
Chlorides mg/l
Sulphides mg/l
Nitrides mg/l
Iron mg/l
Water with system
operating (*)
6-8 7,5-9,5
< 5 < 5
< 100
< 10
< 10
< 10
< 0,5