27
HEATING ENGINEER
3
2
2
3
3
3
4
5
3
8
10 15
10
13
14
12
1
EAF
EAF
15
6
3
3
3
3
11
6 7
17 5
3
3
3
5
3
4
3
5
3
4
b
The choice of system components and the method
of their installation are left up to the heating engineer
installing the system. Installers must use their exper-
tise to ensure proper installation and functioning in
compliance with all applicable legislation.
b
Circuits filled with anti-freeze must be fitted with
water disconnectors.
b
If needed, water supplies and recovery circuits must
be conditioned by suitable treatment systems. See
the table alongside for reference values.
Schematic diagram - central heating and domestic hot water production RTQ
115÷2400 3S
REFERENCE VALUES
PH
6-8
Electrical conductivity
below 200 μS/cm (25°C)
Chlorine ions
below 50 ppm
Sulphuric acid ions
below 50 ppm
Total iron
below 0,3 ppm
Alkalinity M
below 50 ppm
Total hardness
35° F
Sulphur ions
none
Ammonia ions
none
Silicon ions
below 30 ppm
1 - Boiler
2 - Central heating manifolds
3 - Disconnect valves
4 - System pumps
5 - Non-return valves
6 - Automatic vent valve
7 - Boiler safety valve
8 - Boiler drain cock
9 - Storage cylinder safety valve
10 - System filling cock
11 - CH expansion vessel
12 -
r
7200 storage cylinder
13 - Storage cylinder drain cock
14 - DHW expansion vessel
15 - Softener filter
16 - Pressure reducer
17 - Anti-condensate pump
DRAINS
DRAINS
HEATING
FLOW
HEATING
RETURN
DHW USER
POINTS
