SOLARFOCUS pellet top touch 35, Installation Manual

Page: 23 / 32

Annex
Installation manual pellet
top
23
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 person-
nel. However, as a general rule of thumb:
Rated boiler Chimney diameter
up to 25 kW 13 cm
up to and incl. 30 kW 13 to 15 cm
up to and incl. 40 kW 15 to 18 cm
up to and incl. 60 kW 20 cm
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 gas pipe diameter. Consult your chimney sweep for
the corresponding calculation.
- The effective height should be minimum 6.5 m.
- The flue gas pipe must rise and be insulated; avoid unnecessary bends; keep the flue gas pipe as short as
possible.
- Draught regulator required! We recommend the use of an explosion flap.
- Maximum deviation between the diameter of the flue gas 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
suitable. 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 aera-
tion and ventilation, provide a minimum free cross-section of 150 cm² 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.
9.4 Recommendations of the EU energy efficiency directive
Use of a buffer tank
- As the most complete combustion of wood pellets is possible only when the boiler is in normal operation and
as greater losses and higher emissions occur during the warm-up and burn-out phases, the use of a buffer
tank is recommended.
- This tank stores the water heated by the boiler, allowing the connected devices (e.g. heating circuit, DHW
tank, fresh water module, etc.) to access it as required.
- This ensures sufficiently long, uninterrupted combustion periods for the boiler.
Use of high-efficiency heating pumps
- When using external heating pumps (e.g. return flow boosting, heating circuit pumps, etc.), high-efficiency
pumps with energy efficiency class A should be used.
- Savings potential up to 80% in drive energy (compared to conventional heating pumps) with identical feed
results.

Manufacturer's requirements for high-efficiency heat pumps: > The heater water must meet the specifica-
tions of standard VDI 2035.