PV700a / PV1000a pellet burners
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DK9401B1 www.pelltech.eu
Fire safety water pressure control switch (pressostat).
Enables to keep necessary water pressure in
water reservoir and to ensure with that successful extinguishing procedure when needed.
Pressostat switch allows starting the burner only if water supply is present and pressure exists.
1.2 Pellets
Wooden pellets or saw dust granules are concentrated and homogenized wooden fuel. Pellets are
pressed with high temperature. No extra materials are added, pellets are held together by a natural
ingredient found in wood – lignin. Pellets are neutral, renewable fuel. Its burning doesn’t spoil CO
2
balance in the atmosphere. Not only premium but also the industrial pellets can be used in
PV700/1000a. Pellets must be stored in a dry and ventilated room. Table 3 provides an overview of pellet
properties and threshold values.
Premium pellets
Industrial pellets
Raw material
Sawdust, cutter shavings, stem
wood
Forest, plantation and other
virgin wood, chemically
untreated wood residues
Calorific value
4700-5100 kWh/ton
ca 4700 kWh/ton
Volume weight
ca 650-670 kg/m
3
>675 kg/ m
3
Volume of 1 ton pellets
1.5-1.6 m
3
ca 1.5 m
3
Diameter
6-10 mm
6-12 mm
Length
3-5 x diameter
ca 4mm
Moisture content
8-10 %
ca 5 %
Ash content
ca 0,5%
ca 2%
To replace 1000 l light oil
ca 2 tons or 3 m
3
ca 2 tons or 3 m
3
2 Installation
2.1 Prerequisites to boiler and boiler room
In order to install the burner, the boiler must meet to the following requirements:
It is recommended to use three pass boilers.
The construction of the boiler must make it possible to open the door of the boiler with the burner
connected and removing ash from the furnace. If the door of the boiler is too narrow for opening it
with the burner, then extra hinges must be mounted.
If there is not sufficient (less than 5Pa) negative pressure in the furnace, a flue gas fan should be
installed to improve the movement of the exhaust gases.
The boiler must be installed into boiler’s room in a way that there is enough space for cleaning the
burner, the boiler, the smoke pipe and removing the ash.
The burning chamber must not touch the bottom of the boilers furnace (min 10 cm distance needed).
Table 3 Pellets’ overview
