Energie FF Evi 10, Installation And Instruction Manual

Page: 20 / 59

ENERGIE Page | 18
15.5 Pressure drops (water filter
ø
1”)
15.6 Heating water quality
The composition and quality of the water in the system has a direct effect on
the performance of the entire system and the lifetime of the heat pump.
For the initial charging and backfill of the system, usually normal tap water
with a pH value of 7-8 can be used as long as the water is not highly
corrosive (chloride content > 150 mg/l) or hard (>14°dH; degree of hardness
IV). A drinking water analysis can be requested from the local water supply
company.
If the specific system volume is greater than 25 liters/kW heating output (e.g.
through the installation of a hot water buffer storage), then the maximum
permissible calcium carbonate input from the charging and backfilling water
should be calculated in accordance with the VDI guideline 2035. In some
cases the charging water has to be softened.
Note: The use of chemical anti-corrosion agents is not permitted.
Criteria Max. value Effects of non compliance
PH - Wert 7-8
Danger of corrosion in boiler parts
and heating system
Degree of hardness < 14dH
- Increased lime deposits
- Reduced lifetime of boiler
Chloride content < 150mg/l Corrosion of alloyed materials
0
2
4
6
8
10
12
14
16
18
20
22
0,6 1 1,5 2 2,5 3 3,5 3,75
P
re
ss
u
re
d
ro
p
s
[K
P
a]
Water flow [m³/h]