Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 79

Burner Connection, Burner Control Wiring (VD2/VD2A/CT3 only)
CAUTION
This is a generic connection drawing
only! Follow the burner
manufacturer's connection drawings
for Viessmann controls.
a b
A Control unit
(Legend: see wiring diagram)
B 2nd stage or modulating *
C Hours counter, stage 1 *
D Burner fault indicator *
E Control circuit, stage 1/
1
basic load *
F Burner
1
* Refer to burner manufacturer's instruction on detailed connections for Viessmann controls.
Burner power supply not shown.
fÖ Power supply connection of control
unit 120 VAC
1 fA Burner, 1st stage
1 lÖ Burner, 2nd stage
1
Write the terminal numbers or
markings on the drawing for future
reference.
Plug connection
located on the
DIN rail. See page
42 for details.
aBÖ Plugs for external equipment
a External safety devices
(remove jumper when connecting)
b External controlled switch-off
(remove jumper when connecting)
aBA Safety circuit. Emergency
shut-off
Installation
(continued)
79