Viessmann NC-Box Installation And Service Instructions For Contractors page 13

Electrical connection
A
G
F
aVG
X6
11
5
F2
1
F0
15
Fig.6
NC-Box
A
Mixer extension kit
B
aVG KM BUS to the heat pump control unit or to
the KM BUS distributor in the case of several
KM BUS subscribers
NC-Box terminal box
C
X2 230 V~ terminal strip
Power supply 1/N/PE 230 V/50 Hz across
■
X2.1 and X2.2 via on-site power distribution
board
■ Switching the NC-Box (NC signal) across
X2.3 and X2.4 by the heat pump control unit
X5 Earth conductor terminal strip
"Vitotronic 200" service instructions
(cont.)
B C
X5
aVG
X6
4 3 2 1
sYD sYS
4 3 2 1
X2
D
X2
X1
E
5 4 3 2 1 2 1
sYA sYÖ
Cross connect PCB or luster terminals
D
X1 Earth conductor terminal strip
X2 Neutral conductor terminal strip
E Main PCB (function components 230 V~)
Controller and sensor PCB
F
Vitotronic 200 heat pump control unit
G
Installation sequence
13