INSTALLATION
Installation
www.stiebel-eltron.com HPG-I (C)S Premium | 11
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
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X Temperature [°C]
Y Density [g/cm³]
A Frost protection [°C]
f Insulate the brine pipes with diffusion-proof thermal insula-
tion.
9.4 Heating water connection
Note
The use of non-return valves in the charging circuits be-
tween the heat generator and the buffer or DHW cylin-
der can impair the function of the integral multifunction
assembly (MFG) and lead to faults in the heating system.
f Only use our standard hydraulic solutions for the
installation of the appliances.
The heating system to which the heat pump is connected must be
installed by a qualified contractor in accordance with the water
installation diagrams that are part of the technical guides.
f Thoroughly flush the pipework before connecting the heat
pump. Foreign bodies, such as rust, sand and sealant, can
impair the operational reliability of the heat pump. We rec-
ommend installing our filter assembly in the heating return
(see chapter "Appliance description/ Accessories").
To facilitate easy connection to the heating system, the appliance
is supplied with push-fit connectors (see chapter "Installation/
Fitting push-fit connectors").
f Connect the heating system to the "heating flow" and "heat-
ing return" connections. Check for tightness.
f Ensure that the heating flow and return are connected cor-
rectly.
f When sizing the heating circuit, observe the maximum avail-
able external pressure differential (see chapter "Specifica-
tion/ Data table").
f Provide thermal insulation in accordance with applicable
regulations.
The diaphragm expansion vessel on the heating side is opened
and sealed at the cap valve at the factory.
Safety valve
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1
2
1 Procedure
2 Drain
f Size the discharge outlet so that water can drain off unim-
peded when the safety valve is fully opened.
f Ensure that the safety valve drain is open to the outside.
f Install the safety valve drain with a constant fall to the dis-
charge outlet. When installing the drain, never kink the drain
hose.
9.5 Oxygen diffusion
!
Material losses
Do not use open vented heating systems. Use oxygen
diffusion-proof pipes in underfloor heating systems with
plastic pipework.
In underfloor heating systems with plastic pipes that are per-
meable to oxygen and in open vented heating systems, oxygen
diffusion may lead to corrosion on the steel components of the
heating system (e.g. on the indirect coil of the DHW cylinder, on
buffer cylinders, steel radiators or steel pipes).
f With heating systems that are permeable to oxygen, separate
the heating system between the heating circuit and the buff-
er cylinder.
!
Material losses
The products of corrosion (e.g. rusty sludge) can set-
tle in the heating system components, which may re-
sult in a lower output or fault shutdowns due to reduced
cross-sections.
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