1.0 USER INSTRUCTIONS
1.1 Welcome
A very warm welcome from Percy Doughty, and thank you for purchasing the Olsberg Kassel wood burning stove from the Pen-
man Collection. The stove is one of our finest and we hope you enjoy years of pleasure once your new stove is installed.
Percy Doughty prides itself in providing the very best products ensuring a timeless design with longevity of service. Our stoves
will enhance your home and become a real focal point of beauty and elegance.
The stove has been designed in such a way as to perform to the optimum combustion which is both environmentally friendly
and efficient, with the best possible design in mind the heat produced will provide you with all the comfort and control need-
ed.
By reading these instructions it will give you the best insight in to using your stove efficiently and ultimately to prolong its life’s
service to your family. This instruction manual will also help you when lighting your stove and through its general use and care.
Percy Doughty always recommends that the stove is installed by a HETAS registered engineer and serviced on an annual basis
but not limited to. The stove is a quality precision engineered product, if the installation has been incorrect or the appliance
gets mistreated by overloading or using the incorrect fuel, it can damage the appliance and connecting flue system.
1.2 Fire Plus System
The Fire Plus System of your OLSBERG stove provides optimal, environmentally friendly burning and – combined with an effec-
tive heat exchange system – high efficiency.
After loading and lighting the fuel, the first phase of the combustion process starts by proceeding to burn the gases leaving the
fuel. This is the time of, ”high flames”. After the flames reduce, the rest of the coal burns up in the second phase of the com-
bustion process. This process is characterized by strongly glowing embers with no or only smaller, temporary flames.
Optimal and environmental friendly burning with high efficiency can only be achieved if we provide the necessary quantity of
air at the appropriate places in all phases of the combustion process. Both the longer time spent in the combustion chamber by
gases mixed with air and the hot combustion chamber have a positive effect on the combustion process.
This effective burning can be achieved by the Fire Plus System. The primary air flow through the openings of the grate is com-
pleted by the secondary air flow through the glass front and tertiary air entering at different heights of the combustion cham-
ber. Wood, wooden briquettes and brown coal briquettes are fuels of “high flame”.
At this height and later above the glowing embers secondary and tertiary air get inside in such way that mixing of the air and
gases and the time that gases spend in the combustion chamber (depending on their structure) results in good burning. The
excellent quality lining (chamotte, vermiculite) of the combustion chamber provides high temperature, helping the process.
After, that gases are lead through one or more dead-plates in the upper part of the stove, namely through a heat exchange
system, that consist of a pipe system where heat is transmitted again.
Gases finally leave the stove through the flue outlet and then enter the chimney at a temperature of 250 – 330 ºC through the
connecting pipe. The remaining energy content of the gases provides the necessary feed pressure in the chimney, “motor of
the stove”. This is the operating principle of OLSBERG stoves.
Overloading:
Fireplaces are structurally not suitable for non-stop use. Only a relatively small amount of fuel must be loaded in the combus-
tion chamber at any one time. More information about quantities of fuels to be used is given in technical data.
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