Non-Wood Fuels; Maximum Water Content; Limitation Super Fines And Dust; Suitable Fuel Types For Vitoflex 300-Uf Systems - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

General Information
Wood Fuel Requirements

Maximum water content

The maximum allowable water content of the fuel for Vitoflex 300-UF systems is limited to 50%.
The water content impacts the maximum boiler output.

Non-wood fuels

Non-wood fuels even if consisting of biomass, such as needles, foliage, grain, straw, fruit pits, etc, are unsuited
as fuel for boiler operation and may not be used.
Limitation super fines and dust [wood particles smaller than
Max. 10.0% of the total mass; if fuel does not comply with this limit the following process may occur:
- Temperature peaks
- Slag formation
- Even higher temperature
- This process leads to damage by overheating and can affect refractory materials.
Elevated values are especially critical for remnant wood in combination with elevated values of Chlorine and Sulphur.

Suitable fuel types for Vitoflex 300-UF systems

- Bulk density S in kg/m³ [lb/ft
Note: Fuel for Vitoflex 300-UF systems allow for a max. of 50% water content (W).
Saw dust
Fuel code Bulk Density kg/m³ [lb/ft³]
a S130 [8.1]
b1 S200 [12.5]
c2 S250 [15.6]
Wood chips
Fuel code Bulk Density kg/m³ [lb/ft³]
b2 S200 [12.5]
c1 S250 [15.6]
d1 S300 [18.7]
d2 S300 [18.7]
e1 S350 [21.8]
e2 S350 [21.8]
f1 S400 [24.9]
Shavings and chips
Fuel code Bulk Density kg/m³ [lb/ft³]
g S130 [8.1]
h S200 [12.5]
i S250 [15.6]
Pellets and briquettes
Fuel code Bulk Density kg/m³ [lb/ft³]
j S350 [21.8]
k1 S650 [40.6]
k2 S650 [40.6]
Note: For size of wood chips, see page 11.
12
(continued)
3 ], water content (W) in %, size C1, C7, P1, P2, P4 as per CAN/CSA-B366.1-M91.
Water content % Fuel Size
W10 to W20
W20 to W35
W35 to W50
Water content % Fuel Size
W20
W20 to W35
W20 to W35
W35 to W50
W20 to W35
W35 to W50
W35 to W50
Water content % Fuel Size
Less than W15
Less than W15
Less than W15
Water content % Fuel Size
Less than W15
Less than W10
Less than W10
Vitoflex 300-UF Installation & Operating
1 / in. (1.0 mm)]
32
Description
C1 Sawdust, untreated (planing shop)
C1 Sawdust, untreated (sawmill)
C1 Sawdust, untreated (sawmill)
Description
C7 Forest wood chips, soft, untreated
C7 Forest wood chips, soft, untreated
C7 Forest wood chips, soft/hard, untreated
C7 Forest wood chips, soft, untreated
C7 Forest wood chips, hard, untreated
C7 Forest wood chips, soft/hard, untreated
C7 Forest wood chips, hard, untreated
Description
Shavings & chips from wood remnants,
C7
dry, mixed
Shavings & chips from wood remnants,
C7
dry, mixed
Shavings & chips from wood remnants,
C7
dry, mixed
Description
Briquettes from wood remnants c in. (20
P4
mm) to max. 2 in. (60 mm)
P1
untreated up to e in. (10 mm)
P2
untreated e in. to c in. (11 mm to 20 mm)