INSTALLATION
Mounting
www.stiebel-eltron.com WPF basic | 21
0
0,5
1
1,5
2
2,5
3
0 200 400 600 800
D0000058692
X System volume [l]
Y Charge pressure [bar]
1 Required charge pressure subject to the system volume with
33% brine
2 Required charge pressure depending on system volume with
25% brine
1
26�03�01�1606
1 Drain, brine side
Fill the brine circuit via the drain.
After filling the system with brine and prior to commissioning,
open the drain until brine runs out of it. No water must remain in
the pipe run to the drain.
Check the brine concentration:
Determine the density of the ethylene glycol/water mixture,
e.g. with a hydrometer.
Using the actual density and temperature, you can check the cur-
rent concentration in the diagram.
1,10
1,09
1,08
1,07
1,06
1,04
1,03
1,02
1,01
1,00
0,99
0,98
-20 0 20 40 60 80 100
50 Vol.-%
0
1,05
40
33
30
25
20
10
A
26�03�01�1914
X Temperature [°C]
Y Density [g/cm³]
A Frost protection [°C]
Note
The quoted details refer to ethylene glycol. These details
will differ slightly (see “Specification”) when using pro-
pylene glycol and the heat transfer medium as ready-
mixed solution.
Thermally insulate all brine pipes with vapour-proof material.
To prevent the transmission of noise, connect the heat source
circuit to the heat pump with flexible pressure hoses.
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