Viessmann PM1 Installation And Service Instructions Manual page 19

Setting parameters
Display
Function 2: Target temp control
(cont.)
Value
03:2
Commissioning and adjustment
Explanations
Function 2:
Only in conjunction with a heating water buffer cylin-
der
A
C
B
E
Boiler water temperature sensor
A
Oil/gas boiler
B
Heating water buffer cylinder
C
D Heating circuit
Boiler circuit pump
E
In function 2, the speed of the boiler circuit pump is
controlled subject to the set boiler water temperature.
The smaller the temperature differential between the
actual and set boiler water temperature, the higher
the speed of the boiler circuit pump.
This allows the boiler water temperature to rise more
quickly. It also prevents the system from being cooled
down by high flow rates with low boiler water temper-
atures.
Temperature sensor used for function 2:
Boiler water temperature sensor at plug
■
Vitotronic control unit
or
Boiler water temperature sensor at plug 3A/3B of
the burner control unit
If the target temperature needs to be controlled dif-
■
ferently, e.g. through the flow temperature in the
boiler circuit, an additional temperature sensor can
be connected to plug S3 of the pump module. In
this case, parameter "2B:1" should be set.
Note
For further setting options for function 2, see parame-
ters "07", "08" and "09".
D
M
or 3A/3B
§
of the
§
19