Viessmann Vitotronic 200 Installation And Service Instructions For Contractors page 34

Electrical connections
Connecting an AC burner
A
B4 S3 T2 T1 N L
41
B
Fig. 25
To the control unit
A
To the burner
B
Plug terminal designations
L1 Phase via high limit safety cut-out to the burner
PE Earth conductor to burner
N Neutral conductor to burner
T1, T2 Control chain
S3 Burner fault terminal
B4 Hours run meter terminal
Signal flow direction:
Control unit burner
→
Signal flow direction:
Burner control unit
→
34
(cont.)
:
fA
A
BN
BK
BU
BN
BK
BU
90
T6 T7T8
B
Fig. 26
To the control unit
A
To the burner
B
Terminal designations:
T6, T8 Control chain burner stage 2 ON or modulation
controller Open
T6, T7 Control chain burner stage 2 OFF or modula-
tion controller Close
Colour coding to IEC 60757:
BK Black
BN Brown
BU Blue