Installation & Servicing instructions ATAG iC-Range
14
9 Connecting boiler
The boiler has the following connection pipes;
- The central heating pipes.
The boiler is provided with isolation valves on the fl ow and return pipe to which the installation can be
connected by means of 22mm compression fi ttings;
- The gas pipe.
The boiler is provided with an isolation gas valve to which the gas line can be fi tted with 22mm
compression fi tting;
- The condensation drain pipe.
It consists of a 25mm fl exible plastic pipe. The drain pipe can be connected to this by means of an open
connection;
- The fl ue gas exhaust system and air supply system.
It consists of a concentric connection 60/100 mm.
- Cold and hot water pipes.
The boiler is provided with a isolation valve on the cold water inlet. The DHW installation can be
connected by means of 15mm compression fi ttings.
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 fl ush the installation
before connecting it to the boiler.
9.1 Central heating system
Connect the central heating system according to the current regulations.
The boiler pipes can be connected to the installation by means of 22mm compression fi ttings. For connecting
to thick-walled pipe (welded or fi tted), adapters should be used.
The boiler has a self-adjusting and self-protecting control system for the load. This involves checking the
temperature diff erence between the fl ow and return water. Table 9.1.a shows the water displacement the
circulation pump can deliver for a particular installation resistance.
If the installation resistance is higher than the value stated, the control system will adjust the load until a
temperature diff erence between fl ow and return water is reached that is acceptable for the control system.
When the temperature diff erence still remains too high the boiler will switch itself off and wait until the high
temperature diff erential between the fl ow and return water has decreased again.
Pump type Grundfos UPM3 15-75
iC 24 iC 28 iC36 iC 40 iC Economiser Plus 27 iC Economiser Plus 35 iC Economiser Plus 39
Water fl ow rate l/min 15.2 15.2 20.3 20.3 15.2 20.3 20.3
l/h 912 912 1218 1218 912 1218 1218
Permissible installation resistance kPa 25 25 20 20 25 20 20
mbar 250 250 200 200 250 200 200
Installation resistance table 9.1.a
The control system will, if an unacceptable temperature diff erence is detected, repeatedly try to establish a
water fl ow. If this does not succeed, the boiler will block itself (code 154).
The boiler is NOT equipped with a built-in internal fi lter.
Advice: ATAG Heating Technology Ltd recommend the installation of an in-line fi lter installed into the
heating return as close to the boiler as possible. ATAG Heating Technology Ltd recommend the use
of the:
ATAG iGuard Magnetic fi lter 22mm (Plastic) FC000100, (Brass) FC000200, 28mm (Brass) FC000250.
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