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Balanced
flue
connection
Gas and water connection
Flue with roof outlet
Frequently, attic heating centres are connected
to a direct flue outlet through the roof. For
routing flue gas through the roof, ROTEX offers
the balanced flue system connection set L.
Components and layout of this set as follows
(see Fig. 3.4.3):
Balanced flue connection set L:
part no. 15 50 79.10
1 PP balanced flue test
port piece DN 80/125
2 PP balanced flue
inspection pipe DN 80/125
3 Roof outlet 400 mm DN 80/125
above the roof, incl. batten clip, black
Important: Generally order a
matching roof cover for sloping
or flat roofs separately to the set L.
Supplementary assemblies
For the flue connections to a duct or an
external wall system, ROTEX offers
supplementary flue gas system sets with all
required components (for duct flue set E, for
external wall flue set G). In case of higher
ceilings or roofs, use additional PP balanced
flue pipes. Use additional single wall PP pipes
for chimney heights above 10 m. For individual
prices, see the ROTEX pricelist.
Note: Vibrations in the flue gas
system can, in some cases, result
in an outlet noise at the flue outlet
that some find a nuisance. The noise level
can be effectively reduced with the outlet
silencer, available under part no. 15 45 78.
Heating and DHW line connection
All connection lines of the GSU/GCU lead
upwards through the cover hood. Only the
connection of the return of the optional ROTEX
Solaris system is located at the equipment
front. The heating circuit and the cylinder
primary circuit share a common flow and
return. The cylinder primary circuit is
integrated at the factory and does not require
a separate connection.
Important: If the GSU/GCU is
connected to an existing heating
system with pipework or radiators
made from steel or with permeable
underfloor heating system pipes, flush the
heating network before connecting the
heating lines.
Fit a dirt filter into the heating return to
protect the heating circuit pump.
When connecting the equipment to the cold
water supply, ensure that the maximum mains
pressure should be around 6 bar. Never exceed
10 bar. Install a pressure reducer if higher
mains pressure prevails. For connection work,
EN 806 and DIN 1988 [or local regulations]
apply.
The heating connections are fitted with female
threads, those for DHW with male threads.
Position and dimension can be found in Fig.
3.4.4.
Please note: Risk of corrosion
If steel pipes are used in the
cold water supply line, there
will generally be a risk that swarf can
enter the corrugated stainless steel pipe
heat exchanger, where it could settle. This
case must be prevented by using a filter or
by flushing the feed line prior to filling the
heat exchanger. Otherwise corrosion
damage and heat exchanger leaks could
result.
DHW cylinders should be installed as closely
as possible to the draw-off points. A DHW
circulation line is frequently not required, even
if draw-off points are further away.
Where a DHW circulation line is a must, this
can be implemented in accordance with the
diagram in chapter 5.3. To minimise heat
losses, carefully insulate (thermally) the entire
DHW pipework. Any scale that may be created
as a result of heating the water, will be
flushed out with the DHW of the corrugated
stainless steel pipe heat exchanger.
Please note: Where water is
very hard (harder than’ ~
1.8 mmol/l), it is recommended
to install a filter in the DHW line.
Otherwise there might be a risk that the
flushed-out scale can block the perlators
in the taps.
Make the connection of the blow-off line to
the safety valve and the diaphragm expansion
vessel connection in accordance with
EN 12828.
Please note: Danger risk
of scalding!
As cylinder temperatures in
excess of 60 °C can occur, particularly
when operating the GSU with a solar
heating system, install an anti-scalding
device on site (DHW mixing facility). The
same applies to the GCU, if set DHW in
excess of 60 °C have been selected or
pasteurisation has been activated.
Low water indicator
The ROTEX GasSolarUnit/GasCompactUnit has
been verified in tests to safely shut down and
interlock the burner in case of water shortage
through the overheating protection. This
makes an on-site low water indicator
superfluous.
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