Heating Connection; Heating Flow And Return Connection - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

b) connecting into the internal discharge branch (e.g. sink
waste or washing machine) with an external termina-
tion, the condensate discharge pipe should have a
minimum diameter of 22 mm with no length restriction
and should incorporate a trap with a 75 mm (3) (built
into the boiler) seal. The connection should preferably
be made down stream of the sink waste trap. If the
connection is only possible upstream, then an air
break is needed between the two traps. This is normal-
ly provided by the sink waste.
c) terminating in a gully (5) below grid level (6) and
above the water level. The external pipe length should
be kept as short as possible to minimise the risk of
freezing and should not be more than 3 m.
d)at a condensate absorption point (soakaway) (7). The
external pipe length should not be more than 3 m.
Refer to 'BS 6798 Specification for installation of gas–
fired boilers of rated input not exceeding 70 kW net' for
further information. Before operating the boiler the con-
densate trap (1) must be filled with water as described in
relevant section.

4.12 Heating connection

Caution!
When making final connection to the boiler, if
using soldered fittings, extra care should be
taken to avoid damage to isolation valves
through heat transfer.

4.12.1 Heating flow and return connection

Note
Before connecting the heating circuit to the
boiler, all pipework and radiators must be thor-
oughly flushed to remove any installation
debris.
ecoTEC plus combination boiler
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Fig. 4.9 Installing the heating flow and return connection for
ecoTEC plus combination boiler
Instructions for installation and servicing ecoTEC
Supplied By www.heating spares.co Tel. 0161 620 6677
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Boiler installation sequence 4
• Insert the seal (1) and fit the service valve (2) to the
return connection of the appliance.
• Insert the seal (10) and fit the service valve (9) to the
flow connection of the appliance.
• Install the O-ring seal (12) on the return valve (11).
Note
Lay the filling loop hose (13) above the pipework
elbows.
• Fit the union nuts (4) and (7) as well as the compres-
sion olives (3) and (8) to the pre-bended 22 mm cop-
per tails (5) and (6).
• Fully insert pipes (5) and (6) into the service valves.
Tighten the union nuts in this position.
• Fit the handle for the filling loop with a countersunk
screw to the service valve (9).
ecoTEC pro combination boiler
Fig. 4.10 Heating flow and return connection for ecoTEC pro
combination boiler
• Insert a seal (1) and fit the service valves (2) to the
flow and return connection of the appliance.
• Fit a union nut (4) and a compression olive (3) to the
22 mm pre-bended copper tail (5) .
• Fully insert pipe (5) into the service valve. Tighten the
union nuts in this position.
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