Regulations
Compress 7400i AW – 6721840487 (2021/10)
4
Table 4 Table for heat pumps
Fig. 1 Limits for water treatment in heat pump systems
A Use completely de-mineralized fill water above the curve,
conductivity ≤ 10 microsiemens /cm.
B Use untreated tap water below the curve. Fill according to the
drinking water regulation.
H
w
Water hardness.
V Total water volume: Fill volume of the heating system and top-up
volume over the life span of the heat pump.
If the total water volume is above the limit curve in the diagram (Fig. 1)
suitable measures are required for water treatment.
Suitable measures are:
• Use of fully de-mineralized fill water with a Conductivity of ≤ 10
microsiemens / cm.
To prevent oxygen from entering the heating water, the expansion vessel
must be adequately dimensioned.
When installing diffusion open pipes, a system separation with the help
of a heat exchanger is required.
Heat pump
output [kW]
Total alkalinity
/ total hardness
of the filling
water [°dh]
Maximum fill and top-up water
volume V
max
[m
3
]
Q < 50 Requirements
according to
figure 1
Requirements according to
figure 1
0,00
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1,60
1,80
2,00
2,20
2,40
2,60
0 5 10 15
0010036248-002
V [m
3
]
H
W
[°dH]
A
B
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