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4
Set-up and installation
4.6
Water connection
The GCU compact connections are located on the device top or front
(
solar return flow). The heating circuit and storage tank char-
ging share the same flow and return flow. The heating circuit for the
storage tank charging is integrated at the factory and does not need
to be connected separately.
Important information
CAUTION
If the GCU compact is connected to a heating system with
steel pipes, radiators or non-diffusion-proof floor heating
pipes, slurry and swarf could enter the hot water storage
tank and cause blockages, local overheating or corro-
sion damage.
▪ Rinse supply lines before filling the device.
▪ Rinse out the heat distribution network (in the existing
heating system).
▪ Install a dirt filter or sludge separator in the heating re-
turn flow (see
Chap.
1.2.6).
CAUTION
If the GCU compact is connected to a cold water line
where steel pipes are used, chips can get into the stainless
steel corrugated pipe heat exchanger and remain there.
This can lead to contact corrosion damage and sub-
sequently to leakage.
▪ Flush the feed pipes before filling the heat exchanger.
▪ Install a dirt filter in the cold water supply.
ð SAS 1
ð SAS 2
CAUTION
If the heat exchanger for pressurised solar system char-
ging (see
Fig. 3-2
/
Fig.
an external heater (e.g. wood-burning boiler), the
GCU compact can be damaged or destroyed due to an ex-
cessively high inflow temperature at these connections.
▪ The inflow temperature of the external heater should
be limited to max. 95 °C.
CAUTION
Corrosion may be caused by air entering the heating water
network and by a quality of the heating water that does not
comply with the requirements in accordance with
Chap.
1.2.5. Corrosion products (particles) thus created
may clog pumps and valves and cause malfunctions.
▪ Device may not be connected by permeable, flexible
lines.
Installation and operating instructions
26
3-4, items 19 + 20) is connected to
INFORMATION
In accordance with EN 12828, a safety valve that limits the
maximum permissible operating pressure in the heating
system must be installed on or in the immediate vicinity of
the heat generator. There may not be any hydraulic block-
ing elements between the heat generator and the safety
valve.
Any steam or heating water that may escape must be
drained by a suitable blow-off line with constant gradient in
a frost-protected, safe and observable manner.
A suitable safety valve is integrated in the GCU compact
as standard (see
Fig.
3-5, item 24). The blow-off line must
be installed on the building side.
A diaphragm expansion vessel that is suitably dimensioned
and preset for the heating system must be connected to
the GCU compact. There may not be any hydraulic block-
ing elements between the heat generator and the dia-
phragm expansion vessel.
▪ For potable water lines, comply with the provisions of EN 806 and
the additional applicable national regulations for potable water in-
stallation and the information in accordance
▪ To dispense with the need for a circulation line, install the
GCU compact close to the withdrawal point. If a circulation line is
mandatory, it must be installed according to the schematic dia-
grams in
Chap.
8.1.
Floor-standing gas condensing boiler with integrated heat storage
with Chap.
1.2.6.
Gas Combi Unit
008.1543899_02 – 04/2019 – EN
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