Atag iR 12

Installation & Servicing instructions ATAG iR-Range
13
9 Connecting boiler
The boiler has the following connection pipes;
- The central heating pipes.
The boiler is provided with isolation valves on the ow and return pipe to which the installation can be
connected by means of 22mm compression ttings;
- The gas pipe.
The boiler is provided with an isolation gas valve to which the gas line can be tted with 22mm
compression tting;
- The condensation drain pipe.
It consists of a 25mm exible plastic pipe. The drain pipe can be connected to this by means of an open
connection;
- Theuegasexhaustsystemandairsupplysystem.
It consists of a concentric connection 60/100 mm.
See following chapters for detailed information regarding each connection.
It is advisable to clean all of the boiler’s connecting pipes and/or to power ush the installation
before connecting it to the boiler.
9.1 Open vent heating system
This boiler is only suitable for installations that have been equipped with “open” expansion tanks
(open vent).
Connect the central heating system according to the current regulations.
450 mm
Min. height
1000 mm
Min.
150 mm Max.
Heating
circuit
DHW
cylinder
Boiler
22 mm (Min.) vent feed and
expansion cistern
15 mm (Min.) cold feed
Pump
22 mm (Min.)
Automatic by-pass
Open vent heating system
Recommended relationship
between pump, cold feet and vent.
Scheme open vent system Figure 9.1.a