Operating Principle - PRITY PLW11 Installation And Operation Manual

1.2. Operating principle

Using the dosing device comprising gear motor and auger, pellets from the hopper are
charged via the chute into the firepot, made of heat-resistant alloy steel, where they are
burned in a quantity specified by a recipe, corresponding to the heating capacity selected.
Upon start-up, the initially loaded pellets are warmed and kindled automatically using
hot air from the electrical heating coil – igniter, which upon detection of a stable
combustion process is automatically switched off.
The flue gas fan sucks in the required amount of air for a quality combustion process
through the heat exchangers and the firepot openings. The actual amount of air passing is
continuously measured by a flow meter.
The electronic control unit, using a system of sensors and software, compares the
amount of incoming air measured with the pre-set one and makes any corrections
required through the rpm control of the flue gas fan.
The software has been specifically designed and set-up for every particular model and
operation mode, aiming at minimizing the number of kindling operations and harmful
emissions, with the maximum possible input-output ratio for a complete combustion.
The amount of heat generated by the appliance depends on the pre-set operation
mode, trying to maintain permanent temperature of the heat-transfer agent.
Firepot air purging is done over certain periods as well as upon shutting down the
appliance.
The amount of ash deposited in the ash pan and firebox, depends on the feedstock the
pellets have been produced from, on their moisture content and the primary air moisture
content, and for the daily carbon deposit scraping off the heat exchangers there are lever-
operated integrated turbolators installed.
In order to preserve the health, life and property of the users there are the respective
protections provided, which will stop the operation of the appliance in cases of incorrect
and foreseeably dangerous modes of operation.
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