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The water, utilized to fill the heating system, as well as the hot water boiler,
should cover the following requirements (according to BDS 15207-81):
Parameter
Dimension
Value
Total hardness
mg.eq/kg
30
Oxigen content
mg/kg
100
Free sulfide content
mg/kg
2
Oil and other heavy oil derivatives content
mg/kg
3
Total hardness
mg/kg
50
Salt contents
mg/kg
6000
Dispersed matter contents
mg/kg
5
Total alkalescency
mg/kg
30
рН
-
8.0 – 9.5
Free
СО
2
contents
mg/kg
not allowed
Table 4.1. Parameters of the water, allowable to be used as circulating fluid in a
heating system.
In case the heating system contains copper elements and the circulating water id
in direct contact with them, the pH of the circulating water should not exceed
10.
ATTENTION: The finalization of the system installation and performing the
commissioning tests should be filled in the appropriate documents of the
boiler, where the required data fields should be filled in (this is obligatory).
The boiler’s producer recommends a principal hydraulic scheme for attaching
the hot water boiler to the heating system, equipped with three way valve and a
heat accumulator, as shown on figure 4.7.
