Additional Connections - Viessmann AC-Box Installation And Service Instructions For Contractors

Installation sequence
Electrical connection
The free ends have been stripped of their insulation
and have wire ferrules fitted and are therefore ready
for connection.
Existing connecting cables
Designation Function
"NC signal" Switching signal 230 V~ for switching the AC-Box for the natu-
ral cooling function
"AC signal" Switching signal 230 V~ for switching the AC-Box for the ac-
tive cooling function
"SC" Shutdown signal for heat pump if safety equipment has re-
■
sponded, e. g. contact humidistat 24 V
The shutdown signal is part of the heat pump safety chain.
■
"Mains" Power supply 1/N/PE 230 V/50 Hz

Additional connections

To connect the following components, insert the con-
necting cables into the AC-Box, where they must be
routed accordingly:
■ Contact humidistat 24 V
■ Additional frost stat (accessories)
12
(cont.)
(accessories)
–
Internal connec-
tion, plug
aMAD
aMAE
aMG
and/or frost stat
–
fÖ
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