Wood Fuel Requirements; Allowed Fuels - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

Vitoflex 300-UF Installation & Operating

Wood Fuel Requirements

The Vitoflex 300-UF is only suitable for burning fuels
listed in this section. A prerequisite for approval is of
a fuel by Viessmann is the approval for the fuel by the
responsible public authorities.
Warranty claims for Viessmann Biomass boilers are
excluded if the following fuel conditions are not met.

Allowed fuels

- Forest wood and plantation wood (complete untreated trees and trunk wood):
Mature wood from trunks and branches, untreated, chopped to chips
- Compressed wood, pellets conforming to standards, as per CAN/CSA-B366.1-M91, size P1, P2, P4.
Untreated wood with limited bark content, compressed by machine and calibrated
Fuel
P1 - Pellets Small
P2 - Pellets Medium
P4 - Briquettes (Pellets Large)
- Wood with an increased proportion of bark, tree cuttings from roadside trees (untreated):
Wood remnants from the forestry and sawmill industries or from landscape conservation (likelihood of elevated ash content).
- Remnants from derived timber products:
Usually a mixture of untreated and treated wood in the form of shavings from processing machinery and chips from
choppers.
- Used wood:
This is untreated wood that has been used prior to its energetic utilization (e.g. pallets). It is reduced in size by
shredders for thermal utilization. The metal parts have to be removed by magnetic separators.
Size of Wood Chips as per CAN/CSA-B366.1-M91, Grade C7
Total mass 100%
Coarse percentage max. 20%
Main percentage 60 to 100%
Percentage of fines
(incl. ultrafine content) max. 20%
CAUTION
Chips have to pass through a 1 in. (25 mm) sieve,
additionally, a fraction of max. 5% of the fuel with a
cross-section of max. c in.² (500 mm²) up to a length
of max. 6a in. (160 mm) can be tolerated.
Size of briquettes:
- Fraction of one-offs. max. 5% with cross-section of max. c in.
- Frayed surface by chopping tools (shredders) or slow-running choppers.
- Briquettes, diameter max. 2e in. (60 mm).
Consequences of overstepping particle size:
- Increased maintenance because of a substantially higher risk of malfunction
- Shortened service life of the conveyor augers and drives
Minimal Diameter
---
e in. (10 mm)
c in. (20 mm)
Max. cross-section
Max. length
Coarse sieve nominal mesh width
Medium sieve nominal mesh width
Fine sieve nominal mesh width
IMPORTANT
If different fuels are used, Viessmann will not assume any
liability for the functioning or service life of the boiler plant.
Refer to the "Warranty" section in the General Terms and
Conditions of Delivery.
- Burn wood only
- Do not use chemicals or fluids to start fire.
- Do not burn garbage, gasoline, naphtha, engine oil,
or other inappropriate materials.
Maximal Diameter
e in. (10 mm)
c in. (20 mm)
2b in. (60 mm)
in. 2 (cm 2 )
in. (cm)
in. (mm)
in. (mm)
in. (mm)
2 (500 mm 2 ) up to a length of max. 6a in. (160 mm).
General Information
G 30 Fine G 50 Medium
b (3) c (5)
3g (8.5) 4c (12)
f (16) 1a (31.5)
d (2.8) a (5.6)
/ (1) / (1)
1 1
25 25
11