Connecting an AC burner
41
STB
TR
L1
N T1 T2 S3 B4
Fig. 23
A
To the control unit
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
→
Plug equipment codes
fA
STB Control unit high limit safety cut-out
TR
Control unit temperature controller
H1
Burner fault signal
BZ
Hours run meter
Viessmann matrix burner for Vitocrossal
The burner cables are included in the standard boiler
■
delivery.
Max. power consumption 6 (3) A
■
(cont.)
:
fA
:
90
BN
BK
BU
Fig. 24
To the control unit
A
To the burner
B
Plug 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
Signal flow direction:
Control unit
burner
→
Signal flow direction:
Burner
control unit
→
Colour coding to IEC 60757:
BK Black
BN Brown
BU Blue
Burner without plug
Fit the mating plug from Viessmann or from the burner
manufacturer. Connect the burner cable.
Electrical connections
:
lÖ
33