Installation & Servicing instructions ATAG iS-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 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.
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.
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 (code 154).
Pump type
Boiler
type
l/min
l/h
kPa
mbar
Grundfos
iS 12
UPM3 15-75
7.6
460
25
250
iS 15
UPM3 15-75
9.5
570
25
250
iS 18
UPM3 15-75
11.4
680
25
250
iS 24
UPM3 15-75
15.2
910
25
250
iS 32
UPM3 15-75
20.3
1220
20
200
iS 40
UPM3 15-75
25.3
1520
20
200
Water flow rate at
T 20°C
Permissible installation resistance
Installation resistance
table 9.1.a