60
4 Design and Functions
Fig. 4-30 Wiring proposition for purge of gas line via roof in combination with BurnerTronic
4.6 Staged Operation
Function
BT300 has not only the ability of shifting the burner firing rate in oil operation infinitely but 2-
stage and 3-stage. Therefore oil valve 2 and oil valve 3 is switched ON and OFF depending
on the position of air channel 1.
NOTICE
O
2
trim is not possible in 2-stage operation because O
2
trim needs a minimum of 3 curve
points.
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