Installation and maintenance instructions ecoTEC plus 937 0020031552_06
29
5.14
Connecting the heating supply and return
lines
a
Danger!
Risk of scalding and damage due to leaking
water.
Possible leaks in water pipes.
Make sure there is no tension in the supply
lines when they are installed.
b
Caution!
Risk of damage to service valves caused by
heat transfer.
If the final connections are soldered, the heat
transferred during the process may damage
the service valves.
Use extra care when soldering.
b
Caution!
Risk of damage to the appliance.
Residue in the pipes, such as welding beads,
scale, hemp, putty, rust and coarse dirt, may
be deposited in the appliance and cause mal-
functions.
Flush the heating system thoroughly
before connecting the appliance in order to
remove any possible residue.
10
11
12
13
9
8
7
6
1
2
3
4
5
Fig. 5.9 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.
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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 con-
nection of the combi boiler.
Fit the O-ring seal (
12
) to the non-return valve (
11
).
i
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.
i
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. 5.10 Diameter of the connection lines when using a low
loss header
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Sequence of operations during installation 5
Summary of Contents for ecoTEC plus 937
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