Metal-Fach SD DUO BIO Series, Operation And Maintenance Documentation

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Question Answer Explanation
What does the „fumes sensor damaged” alarm
mean?
Smoke coming from the boiler door.
o
It means that the fumes temperature has exceeded 250 C.
The fumes temperature sensor is broken.
It means that there is no draught.
Lower the fuel feeding. If the fuel is burnt on the burner and grate
simultaniously, feed less fuel to the grate.
Replace the fumes temperature sensor.
Tighten wall in the connection between the flue pipe and the chimney.
Check if the patency of the chimney, and its parameters are as
recommended by the manufacturer.
Seal the outlet of the boiler to the chimney vent, preventing the suction
of cool air.
If the chimney diameter is too small, you can install an extraction fan.
There is water coming from the convection
channels.
The fuel used is wrong or the humidity is too high.
Combustion temperature is too low.
Too little air feed.
Fumes throttle is closed.
Controller is set incorrectly.
Use fuel of proper energy value and humidity.
Open the air throttle.
Open the fumes throttle.
Set the controller right.
What does the „feeder overheat” mean?
What does the „boiler overheat” alarm mean?
The overheated feeder can mean that the fuel bin door
is open.
The seal under the bin is broken.
The cleaning hatch seal is broken.
The seal between the burner and feeder pipe is broken.
Loose screws on the connections of the basket between the
feeder and burner.
o
The boiler overheats when the temperature exceeds 90 C
(usually when the upper grate is in operation).
The hold time is too short.
Close the fuel bin door
replace the seal under the bin door.
Replace the seal under the basket.
Replace the seal.
Tighten all the screws.
Cool down the boiler, remove the fuel if necessary.
Increase the hold time.
Why does the unburnt pellet fall into the ash
tray?
Because the pellet feeing rate or ventilation are too big.
Lower the feeding by 2-3% and check for improvement, if necessary,
repeat the procedure.
Lower the ventilation by 2-3% and check for improvement, if necessary,
repeat the procedure.
A knocking sound is coming from the water
grates in boilers.
It means that the boiler is not levelled properly.
Local boiling on the grates.
No water circulation.
Level the boiler.
Check the water circulation.
Check if the pump is in operation.