Burner Connection, Burner Control Wiring - Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual

Burner connection, Burner control wiring (VD2/VD2A/CT3 only)
For burners with plug-in connection
A
41
120 VAC
B
The burner cables are included in the
standard delivery of the Vitotronic.
Connect the burner in accordance with
applicable codes.
ATo boiler control unit
BTo burner
Terminal codes
L1 Phase via fixed high limit to the
burner
Ground connection
?
N Neutral connection to the burner
T1,T2 Control circuit
S3 Connection for burner fault
indicator
B4 Connection for burner hours
counter
A To plug-in connection in connection
enclosure
B To burner
Installation
1.Disconnect power to burner and
boiler control.
2. Connect plugs fA and plug lÖ to
respective counter plugs in boiler
control unit.
3. Connect the 7-pole plug fA and
the 3-pole plug lÖ to the burner.
Terminal codes
1,2,3 Control circuit "2nd stage
burner or modulation controller"
(via two-point controller with
2-stage operation; via three-
point controller with modulating
operation)
1 From burner
2 Modulating down
3 Modulating up/2nd stage ON
Colour codes as applicable
BK Black
BN Brown
BU Blue
51