Contact Humidistat 24 V; Additional Frost Stat (Accessories) - Viessmann AC-Box Installation And Service Instructions For Contractors

Installation sequence
Electrical connection

Contact humidistat 24 V

Note
If several contact humidistats are used, the switching
contacts must be connected as N/C contacts and in
series.
9
8
7
6
5
4
4 2
3
2
1
X4.1
Fig.10
Contact humidistat (accessories) 24 V
A
X4 Low voltage terminal strip on the AC-Box PCB

Additional frost stat (accessories)

2
1
151B
Fig.11
Frost stat
A
Contact breaking capacity 230 V~, 8 A
18
(cont.)
–
A
, 10 mA
–
A
1. Connect the contact humidistat.
2. Remove the jumper from plug
1. Connect the frost stat.
2. Remove the jumper from plug
: See page 15.
aBAC
: See page 15.
aBAB