28. Boiler output and combustion setting
For boilers with DC18S – DC75SE draught ventilator
Basic setting of primary-secondary air ratio
(DC18S-DC50SE, DC20GS-DC40GS,
DC22SX-DC40SX)
Optimum setting:
fully closed (5 mm) + 5÷10 mm
Maximum setting:
fully closed (5 mm) + 10÷20 mm
Basic setting of primary-secondary air
ratio for DC75SE boiler
Optimum setting:
fully closed (20 mm) + 5÷10 mm
Maximum setting:
fully closed (20 mm) + 10÷20 mm
Basic setting of the added secondary air for boiler
DC50S (front air)
We regulate by turning the adjusting screw. By turn-
ing the screw by 1 revolution anticlockwise we open
the secondary air by 1,75 mm (1 revolution = 1,75 mm).
The manufacturer set the regulation to approx. 2
mm opening (up to the stop + 1 turn anticlockwise).
Without ventilator – DC15E
Basic setting of primary-secondary air ratio
Optimum setting:
fully closed (5 mm) + 5÷10 mm
Maximum setting:
fully closed (5 mm) + 10÷20 mm
Adjusting screw
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