Closing The Nc-Box - Viessmann NC-Box Installation And Service Instructions For Contractors

Power supply
(cont.)
D
E
L1
N
F
Fig.7
NC-Box terminal box
A
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 Terminal strip for earth conductor
Power distribution board (on-site)
B

Closing the NC-Box

Fit in reverse order to Fig. 3 on page 8.
X5
B
C
C
D
E
F
4 3 2 1
X2
A
Heat pump control unit
Mains isolator (optional)
Fuse F1 (max. 16 A)
Power supply 1/N/PE 230 V/50 Hz
Installation sequence
15