Connecting A Three-Phase Burner - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Electrical connections

Connecting a three-phase burner

Potential-free safety chain
Note
A jumper from the external conductor to the control
voltage in the burner may have to be removed.
Always observe the burner manufacturer's details.
A
a
B
C
E
D
Fig. 27
Control unit
A
Main contactor (on site)
B
Three-phase burner
C
Three-phase burner power supply
D
E Main contactor switching
Safety chain (high limit safety cut-out), potential-
F
free
Control chain stage 1/base load
G
Burner fault message
H
Hours run meter stage 1
K
40
H
F G
K
L
fÖ
fA
lÖ
aBÖ
aBA
L
Base load/full load
Control unit power supply
Burner, stage 1
Burner, stage 2
Plug for external connections
External safety equipment; remove jumper
a
when connecting
Safety chain, potential-free,
remove jumper when connecting