Installation & Servicing instructions ATAG iC-Range
15
9 Connecting boiler
The boiler has the following connection pipes;
- The central heating pipes.
The boiler is provided with isolation valves on the flow and return pipe to which the installation can be
connected by means of 22mm compression fittings;
- The gas pipe.
The boiler is provided with an isolation gas valve to which the gas line can be fitted with 22mm
compression fitting;
- The condensation drain pipe.
It consists of a 25mm flexible plastic pipe. The drain pipe can be connected to this by means of an open
connection;
- The flue 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 fittings.
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 flush 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 fittings. For connecting
to thick-walled pipe (welded or fitted), adapters should be used.
The boiler has a self-adjusting and self-protecting control system for the load. This involves checking the
temperature difference between the flow 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 difference between flow and return water is reached that is acceptable for the control system.
When the temperature difference still remains too high the boiler will switch itself off and wait until the high
temperature differential between the flow and return water has decreased again.
Pump type
Grundfos UPM3 15-75
i24C
i28C
i36C
i40C
iC
Economiser
27
Plus
iC
Economiser
35
Plus
iC
Economiser
39
Plus
Water flow 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 difference is detected, repeatedly try to establish a
water flow. If this does not succeed, the boiler will block itself.
The boiler is NOT equipped with a built-in internal filter.
Advice: ATAG Heating Technology Ltd recommend the installation of an in-line filter installed into the
heating return as close to the boiler as possible. ATAG Heating Technology Ltd recommend the use
of the:
ATAG iGuard Magnetic filter 22mm (Plastic) FC000100, (Brass) FC000200, 28mm (Brass) FC000250.
