Vitoflex 300-Uf 2. 1 Product Description; Benefits At A Glance; Delivered Condition - Viessmann VITOFLEX 300-UF Technical Manual

Vitoflex 300-UF
2.1 Product description
2
The Vitoflex 300-UF grate combustion system has been specially
developed for the automatic combustion of dry and moist fuels
(wood remnants, wood pellets or woodchips from forest thinnings up
to max. M50). It combines the benefits of underfeed combustion with
the advantages of grate combustion to optimum effect. The
Vitoflex 300-UF grate combustion system is characterised by highest
efficiency levels and perfect combustion in all load stages. The hori-
zontal heat exchanger with pneumatic cleaning is ideal for the use of
fuel with a high percentage of fines.

Benefits at a glance

■ High efficiency thanks to proven combustion technology, three-
pass heat exchanger, modulating output control and regulated pri-
mary and secondary air supply.
■ Easy servicing thanks to fully automatic ash removal and optional
pneumatic cleaning system.
■ Highly developed safety equipment ensures safe and reliable
operation.
■ Optimum system output results from the design and delivery of all
system components from a single source.

Delivered condition

■ Fully assembled steel boiler for wood pellets and woodchips:
– Combustion block with combustion retort:
– Sloping external grate
– Moving burnout grate
– Combustion chamber door
– Ash doors
– Ash pans
– Boiler with horizontal heat exchanger
– Cleaning equipment
■ Flue gas fan
■ Ventilation air fan (primary and secondary air fan)
■ Feed screw conveyor with barrier layer:
– Extinguishing valve with dirt trap
– Extinguishing water container with retainer
Viesmann
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A Three-pass boiler
B External grate with primary air 2
C Safety heat exchanger
D Secondary air
E Ignition fan
F Feed screw conveyor with barrier layer
G Combustion retort with internal grate and primary air 1
H Ash removal
K Combustion chamber door
L Moving infeed grate
M Pneumatic cleaning
The ash is removed automatically from the combustion base and
transported into a standard container. Efficiency of over 90 % ena-
bles maximum seasonal efficiency in modulating operating mode.
Use of the Vitoflex 300-UF as a base load boiler is practical for build-
ing heat loads of 300 kW and above. Combination with a solar ther-
mal system is also easily possible. The Vitoflex 300-UF is tested and
approved in accordance with EN 303-5. It is also manufactured in
accordance with the Machinery Directive and has a CE designation.
It is also subject to on-going inspections by TÜV.
■ Automatic ignition precludes the need for firebed maintenance and
saves fuel.
Option: For fuels with less than 40 % moisture content (< M40)
only.
■ Individual design of your system by our team of experts.
■ Output control from 30 to 100 %
Standard delivery for sensors:
■ Sensors on the combustion block and in the flue outlet:
– Limit switch, combustion chamber door
– Positive pressure limiter
– Negative pressure sensor
– NiCrNi combustion chamber temperature sensor
– Infrared light barriers, fuel level monitoring in combustion cham-
ber
– Zirconium dioxide probe with measured value transducer
(Lambda probe)
– Pt1000 flue gas temperature sensor with 1/2" x 280 mm sensor
well
■ Sensors and switches installed at top of boiler:
– Pt1000 boiler water temperature sensor in flow connector
– Pt1000 return temperature sensor in return connector
– High limit safety cut-out
VITOFLEX 300-UF