Daikin GCU compact Series, Installation And Operating Instructions Manual

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4 Set-up and installation
Installation and operating instructions
28
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
9 Carefully pull the manifold ( Fig. 4-20 , item F) so far backwards
out of its horizontal mounting that the retaining plate ( Fig. 4-22 ,
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 (
Fig. 4-22 , item F) back into its
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 ( Fig. 4-22 , item G) in its
mounting again.
12 Insert the two connection couplings ( Fig. 4-22 , item B) through
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. 4-22 , item E) in the upper mounting.
15 Secure the sealing plug with securing clip ( Fig. 4-22 , item D).
16 Cut out side openings in the thermal insulation ( Fig. 4-23 ,
item A) using a suitable tool.
Fig. 4-23 Cut-out in thermal insulation
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 Fig. 4-4 / Fig. 4-6 ,
refer to the dimension from Tab. 3-1 .
▪ Observe the specified tightening torque (see Chap. 12.3 )
▪ 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).