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4
Set-up and installation
9
Carefully pull the manifold
(Fig.
out of its horizontal mounting that the retaining plate
item A) can be pushed vertically in between.
Fig. 4-22
Heating inflow and return flow connections aligned to the
rear
10 Slide the retaining plate between the manifold and its horizontal
mounting, and insert the manifold
mounting through the middle hole of the retaining plate.
CAUTION
If the plug brackets cannot be put on properly, the coup-
lings can be detached from their mountings to ensure a
very strong or continuous escape of liquid can occur.
▪ Before putting on a plug bracket, make sure that the stir-
rup engages in the coupling groove. To do so, insert the
coupling far enough into the mounting that the groove is
visible through the plug bracket mounting.
▪ Insert the plug bracket up to the end stop.
11 Secure the manifold with securing clip
mounting again.
12 Insert the two connection couplings
the retaining plate into the lateral mountings.
13 Secure the two connection couplings with securing clips
(Fig.
4-22, item C) in their mountings.
14 Insert the sealing plug
(Fig.
15 Secure the sealing plug with securing clip
16 Cut out side openings in the thermal insulation
item A) using a suitable tool.
Fig. 4-23
Cut-out in thermal insulation
Installation and operating instructions
28
4-20, item F) so far backwards
(Fig.
4-22,
(Fig.
4-22, item F) back into its
(Fig.
4-22, item G) in its
(Fig.
4-22, item B) through
4-22, item E) in the upper mounting.
(Fig.
4-22, item D).
(Fig.
4-23,
Fig. 4-24
Tension-free line connection
4.6.2
Connecting hydraulic lines
1
Check the cold water connection pressure (maximum 6 bar).
▪ If a higher pressure is present in the domestic water pipe, a
pressure reducer will need to be installed.
2
Establish hydraulic connections at the GCU compact.
▪ For the position of the heating connections
refer to the dimension from
▪
Observe the specified tightening torque (see
▪ Install the line in such a way that the protective cover of the
GCU compact is simple to put on after assembly.
▪ Connect the water for filling or refilling the heating system as
specified by EN 1717/EN 61770 to avoid contamination of
drinking water by return flow.
INFORMATION
The GCU compact is equipped with a pressure sensor.
The system pressure in monitored electronically and can
be displayed with the device switched on.
Nevertheless, we recommend installing a mechanical pres-
sure gauge between the GCU compact and the diaphragm
expansion vessel, for example.
▪ Install the manometer so that it is easy to see when
filling.
3
Connect the blow-off line to the safety over-pressure valve and
diaphragm expansion vessel in accordance with EN 12828.
▪ Any steam or heating water that may escape must be drained
by a suitable blow-off line with constant gradient in a frost-pro-
tected, safe and observable manner.
▪ Install the line in such a way that the protective cover of the
GCU compact is simple to put on after assembly.
▪ Connect a suitably dimensioned and preset diaphragm expan-
sion vessel for the heating system. There may not be any hy-
draulic blocking elements between the heat generator and the
safety valve.
▪ Position the diaphragm expansion vessel in an easily access-
ible place (maintenance, parts replacement).
4
Carefully insulate pipework against heat loss and to avoid con-
densation (insulation thickness at least 20 mm).
Floor-standing gas condensing boiler with integrated heat storage
Fig.
4-4/
Fig.
4-6,
Tab.
3-1.
Chap.
12.3)
Gas Combi Unit
008.1543899_02 – 04/2019 – EN
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