22
ROTEX GCU compact -
4 x Set-up and installation
4.6.2 Connecting hydraulic lines
Ɣ Check the cold water connection pressure (maximum 6 bar).
– At higher pressure in the drinking water line, a pressure
reducer must be installed.
Ɣ Esta
blish hydraulic connections at the ROTEX GCU compact.
– The positions of the heating connections fig. 4-4 / fig. 4-6,
dimensions are shown in tab. 3-1.
–
Pay attention to the stipulated tightening torque (see
chapter 12.3 "Tightening torque").
– Install the line in such a way that the sound insulation
hood of the ROTEX GCU comp
act can be placed without
problem after assembly.
– Connect the water for filling or refilling the heating system
as specified by EN 1717 to avoid
contamination of drink-
ing water by backwash.
Ɣ Connect the blow-off line to the safety over-pressure valve
and diaphragm
expansion vessel in accordance with
EN 12828.
Ɣ Carefully lag the hot water pipes to prevent heat loss.
– Water shortage protection: Th
e overhea
ting protection of
the ROTEX GCU compact switches off the gas condensing
boiler in case of heat deficiency and locks it. No additional
water shortage protection is needed in the construction.
– Avoid damages caused by deposits and corrosion:
Observe the re
levant regulations of technology to prevent
creation of corrosion products and deposits.
Measures for desalination, softening or hardness stabilization
are
necessary, if the filling and top-up water have a high total
hardness (>3 mmol/l - sum of the calcium and magnesium
concentrations, cal
culated as calcium carbonate.
1 Boiler safety unit (KSG-mini) with safety valve 3 bar, rapid bleeder
and pressure gauge
2 Connector for KFE cock + diaphragm expansion vessel
Fi
g. 4-17 Installation of safety group SBG GCU compact to type 3xx
Fig. 4-18 Installation of safety group SBG GCU compact to type 5xx
(for legend, see fig. 4-17)
UK only!
CAUTION!
If filling or topping up the storage tank is done by
means of the boiler filling and drain valve, a temporary
filling loop must be used with the appropriate backflow
prevention device in accordance with clause G24.2,
Guidance to the Water Supply (Water Fittings)
Regulations 1999.
WARNING!
There is a danger of scalding at hot water tempera-
tures over 60°C. This is possible when using solar
energ
y, if
an external heater is connected, if Legionella
protection is activated, or the hot water set temper-
ature is set to be greater than 60°C.
Ɣ Install a scald protection (domestic hot water
mixing construction
(e.g. VTA32, 15 60 16).
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