23
Installation and maintenance instructions ecoTEC plus 0020031552_03
h
Note
Before connecting the heating circuit to the
combi boiler all pipework and radiators must
be thoroughly flushed out to remove all con-
taminants.
10
11
12
13
9
8
7
6
1
2
3
4
5
Fig. 4.9 Flow and return heating connections
• Remove the stop valves with union nuts, olives and
fibre seals from the box of accessories for the combi
boiler.
• Insert the fibre seal (
1
) and screw the stop valve (
2
)
onto the return pipe connection on the combi boiler.
• Insert the fibre seal (
10
) and screw the stop valve (
9
)
with the fitted flexible hose (
13
) onto the flow connec-
tion of the combi boiler.
• Fit the O-ring seal (
12
) to the non-return valve (
11
).
h
Note
Lay the filling loop hose (13) above the pipe-
work elbows.
• Push the union nuts (
4
) and (
7
) with olives (
3
) and (
8
)
onto the pre-shaped 22 mm pipes (
5
) and (
6
).
• Push the pipes (
5
) and (
6
) into the stop valves up to
the stop. Tighten the union nuts in this position.
• Fit the handle for the filling loop to the cold water
stop valve (
9
) with a countersunk screw.
a
Caution!
Please note that, when fitting a low loss header
the diameter of the connection lines between
the unit and the diverter must not be greater
than 22 mm.
Ø max. 22 mm
Fig. 4.10 Diameter of the connection lines when using a low
loss header
4.15 Condensate
drain
The combi boiler is equipped with a condensate siphon.
(The filling height is 145 mm.) The siphon collects the
condensate in a vessel with a capacity of approx. 200 ml
and feeds the entire contents to the drain pipe. This
minimises the risk of the drain pipe freezing up.
1
2
7
d
c
6
5
a
3
4
3
b
Fig. 4.11 Installing the condensate drain
• Connect the condensate drain (
1
) of the boiler to
a condensate drain pipe (
2
) which has a minimum
internal diameter of 19 mm (22 mm outside diameter
for all external pipes) and which is made from an
acid-resistant material (e.g. plastic overflow pipe).
h
Note
The accessories for the storage tank include a
corrugated hose for draining the condensate.
Sequence of operations during installation 4
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