Extension, Two-Stage Burner, Part No. 7827 417 - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Connecting an atmospheric burner
A
B4 S3 T2 T1 N L
41
B
Fig.20
A To the control unit
To the burner control unit
B

Extension, two-stage burner, part no. 7827 417

The function extension is supplied with the boiler.
(cont.)
Terminal codes
T1, T2 Control chain
S3 Burner fault
B4 Hours run meter
A
BN BU BK
K1
C
K2
BU BK BN
Fig.21
To the control unit
A
To the burner control unit
B
Junction box with relay K1 and K2
C
Electrical connections
K1
K2
23