ARITERM SWEDEN AB Installation, Operation & Maintenance - 2007.08.14- 8/24
Water piping shall be carried out in accordance with current local and national hot
water and building regulations. Safety equipment shall be installed in accordance with
regulations in force.
If a closed expansion vessel is used, an approved safety valve, a pressure gauge, and a
vent valve shall be fi tted. e safety valve shall be fi tted just above, but not directly on,
the boiler in such a manner that the connection with the boiler cannot be closed off .
e connecting line from the boiler to the safety valve must rise continuously. Before the
boiler is fi lled with water, the enclosed drain tap shall be fi tted.
Radiator system and expansion vessel
When you fi ll the system, all valves must be open and the external circulation pump
turned off . Bleed the system carefully while fi lling. When the installation has been in
service for a few days, it shall be bled and refi lled once again.
ATTENTION! See also separate instructions for fi lling of water.
e volume of the expansion vessel is determined as follows:
Open system:
5% of the water volume in the heating system.
Closed system:
Select the volume of the vessel in accordance with the manufacturer’s instructions.
In the following table, you will fi nd examples of suitable closed system expansion
vessels.
System volume Opening pressure Initial pressure Vessel volume
(litre)* (bar) (bar) (litre)
70˚C 90˚C
500 1,5 0,5 35 80
1000 1,5 0,5 80 140
1500 1,5 0,5 80 140
2000 1,5 0,5 140 200
An open system with 500 litre water volume demands at least a 35 litre expansion vessel and a 1500 litre
system volume a 80 litre expansion vessel
* System volume = boiler volume + storage tanks + piping volume + radiator volume.
Planning and installation
Planning and installation shall be carried out in a professional manner, attention being
paid to general and local rules and regulations. Operating pressure is max.
1,5 bar. Before taking the installation into service, and always at the beginning of the
heating season, the following checks shall be carried out:
• that the heating system is fi lled and bled
• that the circulation pump is working
• that the system valves are open
• that the automatic control and safety devices are in working order
• that the chimney has the necessary draught and that the fresh air ventilation
is open.
Safety valve
If a closed expansion vessel has been installed in the radiator system, the safety valve
must be checked 4 times a year.
Activate the valve by pressing or turning the control button and check that water esca-
pes from the overfl ow pipe connecting the valve to the drain.
Elecktrical installation
e supply cable delivered with burner is connected to the burner. In addition, an
over-temperature protection thermostat must be installed in the boiler (this must
acquired separately). e connection is made in accordance with the wiring diagram
annexed to this manual. Also the use of a safety switch (burner switch) is recommen-
ded. e other connection cable delivered with the burner is for boiler temperature
and fl ue gas sensors. Work on the burner may only be carried out by a qualifi ed servi-
ceman. Make sure to cut the power supply to the burner before servicing.
WATER PIPING
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