Viessmann FB2A Installation And Service Instructions For Contractors page 51

Further details regarding the individual steps
System version 3
One heating circuit without mixer A1 and one heating circuit with mixer M2
wQ
wP
1 Vitodens 242-F
2 Outside temperature sensor
3 Heating circuit without mixer A1
4 Heating circuit with mixer M2
5 Temperature limiter for limiting the
maximum temperature of underfloor
heating systems
Note
The volume flow of the heating circuit
without mixer must be at least 30%
greater than the volume flow of the heat-
ing circuit with mixer.
Required coding
Operation with LPG
Commissioning, inspection, maintenance
3
2
1
6 Flow temperature sensor M2
7 Heating circuit pump M2
8 Extension kit for one heating circuit
with mixer M2
wP Solar collectors
wQ Collector temperature sensor
(cont.)
4
5
6
7
M
8
82:1
51