Ariterm Biomatic plus 50, Installation, Operation And Maintenance Manual

ARITERM SWEDEN AB

Installation, Operation & Maintenance - 

2009.02.18- 7/32

The boiler shall be positioned and installed according to the building rules in force.  

Before installing the boiler, the chimney must be controlled for underpressure and 

possible risk of condensation. It is possible that an air draught compensator has to be 

installed. Inner pipe is recommended for minimizing the risk of condensation.

Space needed for installation: Minimum clearance in front of the boiler (burner inclu-

ded) is 1000 mm. Clearence on the top and at least by the other side of the boiler shall 

be at least 0,5 m. The boiler must be level. If the floor is uneven, adjustments can be 

made with the help of four adjusting bolts (enclosed with the boiler) that shall be fit-

ted to the bottom plate of the boiler. The air intake duct to the boiler room must have 

at least the same area as the flues.

Chimney installation

To embed the angular tube in the chimney, proceed according to the drawing below. 

If the tube is embedded as described, you will be able to avoid soot leakage when the 

chimney is being swept. 

Flue connection and combustion air intake

The combination flue of the boiler allows for connection towards the top as well as to 

the rear. Boiler cement is suitable for sealing. Recommended flue gas requirements for 

B 20/30: brick chimney lined with a Ø 100 mm (130 mm for 30) acid proof 

thin-walled tube or an acid proof Ø 100 mm:s (130 mm for 30) element chimney. 

Recommended underpressure for B 20 is 20 Pa (25 Pa for 30). The height of 

the gas flue shall be dimensioned according to the building’s requirements, but should 

be at least 5 m for B 20 (6 m for B 30). If condensation water comes 

out of the flue, a condensate drain pan shall be installed in the lower portion of the 

chimney. The combustion air intake must not be covered.

ATTENTION!

  The chimneysweep must  

be notied for inspection of the flue. 

CAUTION!

  The boiler has low flue 

gas temperatures, which, under certain 

conditions,might lead to condensation of 

flue gases.

INSTALLATION

30

Mortar

Flue pipe

30 mm incom-

bustible

insulation

Imbedment into chimney

A = 1560 mm

(exkl ställbara

fötter)

Golv

Ø200 mm

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 fitted. The safety valve shall be fitted just above, but not directly on, 

the boiler in such a manner that the connection with the boiler cannot be closed off. 

The connecting line from the boiler to the safety valve must rise continuously. Before the 

boiler is filled with water, the enclosed drain tap shall be fitted.

Radiator system and expansion vessel

When you fill the system, all valves must be open and the external circulation pump 

turned off. Bleed the system carefully while filling. When the installation has been in 

service for a few days, it shall be bled and refilled once again.  

ATTENTION!

 See also separate instructions for filling of water. 

The 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 find examples of suitable closed system expansion 

vessels.

WATER PIPING

System volyme

Opening pressure

Initial pressure

Vessel volyme in litre

litre*

bar

bar

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 storage tanks + piping radiator volume.