Switching To Heat Pump Control Unit (Nc / Ac Signal); Shutdown Signal For Heat Pump 230 V - Viessmann AC-Box Installation And Service Instructions For Contractors

Installation sequence
Electrical connection

Switching to heat pump control unit (NC / AC signal)

A
171E
2 1
BU BN
B
X6
4 3 2 1
sYD sYS
Fig.8

Shutdown signal for heat pump 230 V~

The frost stat and contact humidistat 24 V
nected to the AC-Box. The shutdown signal must be
connected at the heat pump control unit to ensure the
compressor stops when these safety devices respond.
16
(cont.)
171D
2 1
BU BN
D
E
C
X2
X1
5 4 3 2 1 2 1
sYA F sYÖ
are con-
–
Note
Plugs aMAD and aMAE are plugged into the AC-Box
PCB at the factory.
AC-Box PCB
A
"AC signal" connecting cable
B
"NC Signal" connecting cable
C
Heat pump control unit Vitotronic 200
D
Cross connect PCB
E
X1 Earth conductor terminal strip
X2 Neutral conductor terminal strip
Main PCB (function components 230 V~)
F