Prior To Assembly; Installation Room; Chimney Connection - SOLARFOCUS octo plus Installation Manual

Prior to assembly

3 Prior to assembly

3.1 Installation room

The installation location and the fuel storage room must meet the applicable regional regulations (with regard to:
structural requirements, ventilation, fire protection, safety equipment, environmental protection; in AT: ÖNORM
H5170 and TRVB H 118).
The installation room must be frost-proof and dry and have a level floor of sufficient load-bearing capacity (note
total weight of boiler  5
Note the installation dimensions to ensure sufficient space is provided (including for service and maintenance
work).

3.2 Chimney connection

The correct dimensioning of the chimney and the selection of the right chimney system are important preconditions
for correct functioning of the heating system. The chimney must route off the gases reliably at all times. The chim-
ney should be moisture-resistant, e.g. made from stainless steel. Adequate insulation of the chimney must be pro-
vided.
Cross-section and chimney height
The necessary cross-section depends on the nominal output of the heating system and the effective chimney
height (at least 6.5 m). We recommend that you have the chimney calculations performed by qualified personnel.
However, as a general rule of thumb:
Rated boiler
up to 25 kW
up to and incl. 30 kW
up to and incl. 40 kW
up to and incl. 60 kW
Draught requirement for boiler: 5 Pa
Important points regarding the chimney connector
The chimney must be resistant to moisture (fire bricks or stainless steel)
Ensure that the chimney is adequately insulated.
The cross-section should correspond to the boiler flue pipe diameter. Consult your chimney sweep for the corre-
sponding calculation.
The effective height should be minimum 6.5 m.
The flue pipe must rise and be insulated; avoid unnecessary bends; keep the flue pipe as short as possible.
Draught regulator required! We recommend the use of an explosion flap.
Maximum deviation between the diameter of the flue pipe and the diameter of the existing flue is one size larger or
smaller (always consult the manufacturer)
Supply and exhaust air
The following applies for Austria (in accordance with ÖN H 5170):
For the supply air, 2 cm² per kW thermal output of the fuel, but allow at least 200 cm² free cross-section. (Fuel
heat capacity = boiler capacity / efficiency)
For the exhaust air, allow at least 180 cm² free cross-section up to 100 kW nominal heat and an additional 1 cm²
free cross-section for every further kW.
The following applies for Germany (specimen firing ordinance):
For heating appliances with a nominal output of up to 35 kW, a combustion air opening of at least 150 cm² or 2 x
75 cm² routed directly into the open air must be provided.
Alternatively, a door/window leading outside and a room content of at least 4 m³/kW nominal heat output are suit-
able. If the installation room does not abut onto an outside wall, combustion air supply via connecting rooms is
possible. Here, the combustion air is supplied via a sufficiently dimensioned adjacent room which abuts onto an
outside wall.
From 35 to 50 kW, provide a free aeration cross-section of at least 150 cm². From 50 kW upwards, for aeration
and ventilation, provide a minimum free cross-section of 150 m² for each, plus 2 cm² per KW in excess of 50 kW.

Calculate at least a further 20 % for wire mesh in the aeration cross-section.
8
).
Chimney diameter
13 cm
13 to 15 cm
15 to 18 cm
20 cm
Installation manual octo
plus