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

4 Boiler installation sequence
Fig. 4.7 Installing the hot and cold water connection (ecoTEC
pro)
Note
Flush all foreign matter from the mains supply
before connecting to the boiler.
• Insert the seal (1) and screw in the maintenance tap
(2) at the appliance cold water connection.
• Insert the union nut (4) and the pinching ring (3) on
the conduit arc provided with ecoTEC plus appliances
(5). The diameter of the conduit is 15 mm.
• Insert the conduit arc until the stopper in the mainte-
nance tap. Tighten the union nuts in this position.
• Insert the seal (7) and screw in the conduit (6) on the
appliance hot water connection. The diameter of the
conduit is 15 mm.
• Mount the handle for the fill-up valve with a counter-
sunk screw on the maintenance tap (2).

4.10 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.

4.10.1 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.
20
ba
r
7
6
1
2
3
4
5
ecoTEC plus, 800 series
13
Fig. 4.8 Installing the heating flow and return connection for
ecoTEC plus, 800 series
• Insert the seal (1) and screw in the maintenance tap
(2) at the return connection of the appliance.
• Insert the seal (10) and screw in the maintenance tap
(9) at the flow connection of the appliance.
• Install the O-ring seal (12) on the return valve (11).
Note
Lay the filling conduit (13) above the conduit
elbows.
• Insert the union nuts (4) and (7) as well as the pinch-
ing rings (3) and (8) on the conduit elbows (5) and
(6). The diameter of the conduits is 22 mm.
• Insert the conduit elbows until the stopper in the
maintenance taps. Tighten the union nuts in this posi-
tion.
• Mount the handle for the fill-up valve with a counter-
sunk screw on the maintenance tap (9).
Instructions for installation and servicing ecoTEC
12
11
10
9
8
7
6
1
2
3
4
5