Bedienungsanleitung Atmos A25SP (Seite 25 von 72) (Englisch)

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Operation and Maintenance Manual - EN

www.atmos.cz EN-25

The STARTup mechanism consists of the following steps:

•

At the start the worm conveyor and the ignition spiral are started (the fan on the burner is stopped).

• The worm conveyor will run for the time set by parameter T1, necessary for the delivery of the

amount for pellets for optimum ignition. After the delivery of the ignition amount of fuel the

conveyor stops and burner‘s servo controlled air flap opens. At the same moment the burner

fan starts at the ignition speed - parameter S2 as well as the extraction fan (if the boiler set

accordingly – reserve R and parameter S6).

• After the ignition of pellets the photocell will sense light, which will cause the ignition spiral to

switch off with a slight delay.

• The burner will pass over to the stage of perfect burning of fuel - set by parameter T7.

The OPERATION algorithm consists of the following steps:

• When the fuel burns perfectly, the burner will get to the stage of gradual increase of the power

to the nominal value - parameter T10.

• After achieving the nominal power the burner works in the normal mode until the heating system

or the accumulation tank is heated to the required temperature. The power of the burner results

from the hourly quantity of pellets delivered by the worm conveyor to the combustion chamber.

The worm conveyor works in the intermittent mode set by parameters T4 and T6. Parameters

T4 and T6 are set in accordance with the instructions on page 28.

•

After setting the nominal power of the burner you must also set the amount of combustion air

necessary for complete burning of fuel. This setting is performed with the air flap on the burner

fan. The exact setting should be carried out by a trained person with the use of a flue gas

analyzer.

The burning out algorithm is designed as follows:

•

After the achievement of the set temperature at the boiler thermostat (e.g. 85 °C) or temperature

in the accumulation tank - temperature at the bottom sensor (TS), the electronic control unit of the

burner will switch off the external worm conveyor. Thanks to this, the pellets in the combustion

chamber will burn out. Optimal burning out of pellets in the combustion chamber is additionally

supported by the operation of the burner fan for a certain time - parameter T5. After subsequent

drop of the temperature of water in the boiler or discharge of the accumulation tank - temperature

at the top sensor (TV), the burner will be re-started in the same way as described in the text above.

If the accumulation tank is connected to a solar exchanger and activating functions for automatic

optimization (switching) of sensors, parameter S15 = 3, the burner may be turned off by sensor TK

instead of sensor TS.

The other algorithms are designed in the following way:

• If the first attempt for ignition with fuel supply fails, the burner will repeat the whole algorithm.

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