Viessmann BW 301.A090, Installation And Service Instructions Manual

Page: 59 / 160

59
Plug
sYS
Terminals Function Explanation
212.1
AC
Cooling control
AC function (active cooling) Connection values
■ Output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
Circuit on site, see separate "connection
and wiring diagram" sheet 201 to
sheet 204
212.2
A1
Heating circuit pump for
heating circuit without mixer
(A1/HC1) ■ This pump is connected in addition to
the secondary pump if a heating water
buffer cylinder is installed.
■ Connect temperature controller as a
maximum temperature limiter for un-
derfloor heating circuit (if installed) in
series (see following chapter)
Connection values
■ Output: 100 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
On-site connection, see separate "con-
nection and wiring diagram" sheet 120.
Use contactor, if required; see separate
"connection and wiring diagram"
sheet 121, sheet 122.
212.3 DHW circulation pump Connection values
■ Output: 50 W
■ Voltage: 230 V~
■ Max. switching current: 4(2) A
On-site connection, see separate "con-
nection and wiring diagram" sheet 150.
Use contactor, if required; see separate
"connection and wiring diagram"
sheet 151, sheet 152.
Installation sequence
Overview of electrical connections
(cont.)
5848 164 GB
Installation