Cold Water Mains Inlet And Hot Water Outlet (Ecotec Combination Boilers Only); Condensate Drain Pipe - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

• Fit the union nut (2) and the compression olive (3) to
the gas connection pipe (1) of the boiler.
• Fit the union nut (6) and the compression olive (5) to
the pre-formed tail provided with ecoTEC plus appli-
ances (7).
• Fully insert the service valve (4) onto the gas connec-
tion pipe and the pre-formed tail into the service
valve. Tighten both union nuts of the service valve.
• The diameter of the pipework (7) is 15 mm (22 mm for
37kW models). Connect a gas supply pipe of not less
than 15 mm diameter to the copper tail.
Note
Ensure the gas supply pipework is adequately
sized so that a 20 mbar gas pressure is availa-
ble at the boiler inlet at full flow rate.
• Tighten all connections.
• Check the gas connection with leak indicator spray for
leakage.
4.10 Cold water mains inlet and hot water outlet
(ecoTEC combination boilers only)
Fig. 4.6 Installing the hot and cold water connection (ecoTEC
plus combination boiler)
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.
Note
Flush all foreign matter from the mains supply
before connecting to the boiler.
Instructions for installation and servicing ecoTEC / 839592_09
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Boiler installation sequence 4
• Insert the seal (1) and connect the service valve (2) to
the appliance cold water connection.
• Fit the union nut (4) and the compression olive (3) to
the pre-formed tail provided with ecoTEC plus appli-
ances (5). The diameter of the pipe is 15 mm.
• Fully insert the pre-formed tail into the service valve.
Tighten the union nuts.
• Insert the seal (7) and connect in the pipe (6) to the
appliance hot water connection. The diameter of the
pipe is 15 mm.
• Mount the handle for the filling loop with a counter-
sunk screw to the service valve (2).
Fig. 4.7 Installing the hot and cold water connection (ecoTEC
pro combination boiler)
4.11

Condensate drain pipe

The ecoTEC plus appliances are fitted with a siphonic
trap (The filling height is 145 mm). The siphon collects
the accumulated condensate in a container of approx.
200 ml capacity and directs the entire content into the
drain pipe. The risk of the condensate drain pipe freez-
ing is thus minimised.
The ecoTEC pro appliances are equipped with a normal
condensing water trap where the condensate is con-
stantly emptied into the drain pipe.
• Connect the boiler condensate drain (1) to a conden-
sate discharge pipe (2) which should be minimum of
19 mm internal diameter (22 mm external diameter for
any pipework installed external to the property) and
be made of an acid resistant material (e.g. plastic
overflow pipe).
Note
The discharge pipe from the boiler condensate
drain must have a continuous fall (45 mm per
meter) and preferably be installed and terminated
within the building to prevent possible freezing.
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