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SHT Heiztechnik,
aus Salzburg
Operating instructions
M21/HB M27/GB
Page 59
SHT Heiztechnik aus Salzburg GmbH, A-5020 Salzburg-Bergheim, Rechtes Salzachufer 40 Tel. 0662-450444-0, Fax-DW 9
Our current general terms and conditions apply.Errors, printing faults and technical changes reserved
Oxygen value too low:
Possible cause 1: Pellet grate, smoke gas ducts in boiler and chimney contaminated.
Solution: Wait, the control will adjust the draftfans rotational speed automatically. If the value does not
rise inside 1 hour, abort measurement, do cleaning according to operating manual.
Possible cause 2: Lambda probe deviates (measured value too low).
Solution: Adjust corrected value: see section "Lamda probe corrected value".
Oxygen value too high:
Possible cause 1: Cavern fire (log wood does not chute)
Solution: Loosen log core with spikes above the combustion chamber (loosen bridges so that the wood
stack can chute)
Possible cause 2: Doors or heat exchanger lid leaking.
Solution: Stop burner, check door and lid tightness.
Possible cause 3: Lambda probe deviates (measured value too high).
Solution: Adjust corrected value: see section "Oxygen correction".
Oxygen value too low:
Possible cause 1: Very dry wood, embers core gets too big
Solution: Wait until oxygen value rises or repeat measurement with better suited wood.
Possible cause 2: Lambda probe deviates (measured value too low).
Solution: Adjust corrected value: see section "Lamda probe corrected value"..
"is ON" or "is OFF":
Feedback that measurement operation is active ("is ON") or inactive ("is OFF").
OFF or ON:
Deactivation or activation of measurement operation.
If "is OFF" is displayed and the button "ON" below is pushed, the display in the middle changes to "is
ON" => Measurement operation activated.
If "is ON" is displayed and the button "OFF" below is pushed, the display in the middle changes to "is
OFF" => Measurement operation activated.
Adjust burner power:
See above "Desired power: 100%".
NOTICE: After power has been adjusted, it takes 10 min at least until the burning is adjusted to the
new power – the bigger the adjustment, the longer it takes for the burning to adjust to the new power.