Viessmann BW 301.A090, Installation And Service Instructions Manual

Page: 63 / 160

63
Plug
sXG
Terminals Function Explanation
225.1
M2
r
Heating circuit pump of the
heating circuit with mixer
M2/HC2 Connect the temperature limiter in series
as a maximum temperature limiter for
underfloor heating circuit (if installed).
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 130.
Use contactor, if required; see separate
"connection and wiring diagram"
sheet 131, sheet 132.
225.2
M2
Mixer motor control, heating
circuit M2/HC2
Signal mixer CLOSE Connection values:
■ Output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 0.2(0.1) A
On-site connection, see separate "con-
nection and wiring diagram" sheet 130.
Use contactor, if required; see separate
"connection and wiring diagram"
sheet 131, sheet 132.
225.3
M2
Mixer motor control, heating
circuit M2/HC2
Signal mixer OPEN Connection values:
■ Output: 10 W
■ Voltage: 230 V~
■ Max. switching current: 0.2(0.1) A
On-site connection, see separate "con-
nection and wiring diagram" sheet 130.
Use contactor, if required; see separate
"connection and wiring diagram"
sheet 131, sheet 132.
Installation sequence
Overview of electrical connections
(cont.)
5848 164 GB
Installation