Heating Water Supply In The Open Heating System; Connecting The Heating Flow And Heating Return; Gas Connection; Connecting The Condensate Discharge Pipe - Vaillant ecoFIT pure 412 Installation And Maintenance Instructions Manual

5.3 Heating water supply in the open heating
system
▶
Connect the product to a supply/expansion tank as
shown in the figure.
–
The tank must not be more than 27 m (90 ft) above
the product.
–
The open vent pipe must be installed with an upward
gradient and must not be blocked.
– Supply line diameter: ≥ 15 mm
–
The relative positions of the pump, supply and open
vent pipe must be as shown in the figure.
Conditions: Combined supply and open vent pipe
▶
Install the line in accordance with "BS 5449".
– Diameter: ≥ 22 mm
0020230535_05 ecoFIT pure Installation and maintenance instructions
5.4 Connecting the heating flow and heating
return
1
1 Heating return connec-
tion
1. Establish the heating connections in accordance with
the applicable standards.
2. Check whether the connections (→ Page 19) are leak-
tight.
5.5

Gas connection

1
1. Establish the gas connection (1) in accordance with the
applicable standards.
2. Purge the gas line before start-up.
3. Check the entire gas line properly for leak-tightness.
5.6

Connecting the condensate discharge pipe

1
2
▶
Follow the instructions listed here and observe the legal
and local regulations on condensate discharge.
▶
Use PVC or any other material that is suitable for drain-
ing the non-neutralised condensate.
▶
If you cannot guarantee that the materials from which the
drain pipework is made are suitable, install a system for
neutralising the condensate.
Installation 5
2
2 Heating flow connection
11