Installation
52
Burner Connection, Burner Control Wiring (VD2/VD2A/CT3 only)
(continued)
Write the terminal numbers or
markings on the drawing for future
reference.
Burner power supply not shown.
A
Control unit
(Legend: see wiring diagram)
B
2nd stage or modulating *
1
C
Hours counter, stage 1 *
1
D
Burner fault indicator *
1
E
Control circuit, stage 1/
basic load *
1
F
Burner
fÖ
Power supply connection of control
unit 120 VAC
fA
Burner, 1st stage
lÖ
Burner, 2nd stage
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
*
1
Refer to burner manufacturer’s instruction on detailed connections for Viessmann controls.
5285
941
-
0
1
This is a generic connection drawing
only! Follow the burner
manufacturer’s connection drawings
for Viessmann controls.
CAUTION
a
b
Plug connection
located on the
DIN rail.
