Heating Connection; Ecotec Pro; Heating Flow And Return Connection - Vaillant ecoTEC SERIES Instructions For Installation And Servicing

4 Boiler installation sequence

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
thoroughly flushed to remove any installation
debris.
ecoTEC plus combination boiler
13
Fig. 4.9 Installing the heating flow and return connection for
ecoTEC plus combination boiler
• 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
compression olives (3) and (8) to the pre-bended
22 mm copper 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).
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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.
ecoTEC plus system boiler
Fig. 4.11 Heating-side flow and return connection for
ecoTEC plus system 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.
Instructions for installation and servicing ecoTEC 839592_12
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