Unit installation

50
B2 Safety chain jumper
F1 Backup fuse
F2 Backup fuse
F6 High limit safety cut-out
F7 Temperature controller
H1 Hours run meter, total
H2 Fault message
H3 Hours run meter
Modulation; lower rated heating out-
put; upper rated heating output
K1 Relay contact
S1 ON/OFF switch (inside the control
unit)
S3 Output controller (inside the control
unit)
Burner control unit connection diagram
Burner control unit connection diagram
(cont.)
5692 907 GB