23
ecoTEC plus 937 installation and maintenance manual
4.11 Gas
connection
d
Danger!
Danger of death by gas escapes if the
installation is not properly carried out!
The gas connection must only be made by a
competent person (e.g. CORGI registered).
The legal directives and local regulations for
the gas supply companies must be observed.
a
Caution!
Danger of leaks by improper installation!
Ensure a stress-relief assembly of the gas
pipes.
Caution!
Danger of damage to units and system!
The electronic gas valve may be tested for
leakage only with a maximum pressure of
150 mbar!
At higher testing pressures there is a danger
that the gas fitting could be damaged.
Caution!
Danger of damage to the isolation valves by
heat transmission!
If the final connections to the combi boiler are
made using soldered pipe connections, you
must be particularly careful not to damage the
isolation valves by heat transfer.
Proceed as follows for gas connection:
• Remove the gas connection pipe elbow (
2
) and gas
isolation valve (
1
) from the packaging.
• Push the union nut (
3
) and the olive (
4
) onto the gas
pipe which protrudes from the combi boiler.
• Push the isolation valve (
1
) onto the gas pipe which
protrudes from the combi boiler up to the stop.
• Pull the union nut (
3
) with the olive (
4
) towards the
isolation valve. Tighten the union nut hand tight.
• Push the union nut (
6
) and the olive (
5
) onto the gas
connection pipe elbow (
2
).
• Push the gas connection pipe elbow (
2
) into the gas
isolation valve (
1
) up to the stop.
• Pull the union nut (
6
) with the olive (
5
) towards the
gas isolation valve. Tighten the union nut hand tight.
2
1
3
6
2
4
5
1
Fig. 4.6 Gas connection
• The diameter of the pre-formed copper pipe (
2
) is
22 mm. Connect this pipe to a gas supply pipe having
a diameter of not less than 22 mm.
h
Note!
The gas supply pipework must be of sufficient
size so that, at maximum output, a gas
pressure of 20 mbar is available at the input to
the combi boiler.
• Tighten all connections.
• Purge the gas pipe before commissioning.
• Check the gas connection for leaks using leak-
detecting spray.
Sequence of operations during installation 4
