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K1 Relay contact
M1 Fan motor with PWM control and
feedback
S1 ON/OFF switch (inside control unit)
S2 Temperature controller
S3 Output controller (inside control
unit)
T1 Ignition unit
Y1 Gas fuel safety valve
Y2 Easy start valve/air-control-pres-
sure (option)
Burner control unit connection diagram
Burner control unit connection diagram
(cont.)
5692 488 GB