Viessmann PM1 Installation And Service Instructions Manual page 23

Setting parameters
Display
Function 6: Buffer temp control with target
temperature control
(cont.)
Value
03:6
Commissioning and adjustment
Explanations
Function 6:
Only in conjunction with a heating water buffer cylin-
der
E
A
B
F
D
C
H
Boiler water temperature sensor
A
Alternative additional boiler water temperature
B
sensor S3
Oil/gas boiler
C
D Buffer temperature sensor
Alternative additional buffer temperature sensor
E
S4
Heating water buffer cylinder
F
Heating circuit
G
Boiler circuit pump
H
In function 6, the speed of the boiler circuit pump is
controlled subject to the set boiler water temperature
and the temperature differential between the actual
and set buffer temperature.
If the temperature differential between the actual
■
and set boiler water temperature is small while the
differential between the actual and set buffer tem-
perature is large, the boiler circuit pump operates at
high speed.
If the temperature differential between the actual
■
and set boiler water temperature increases, then
the speed of the boiler circuit pump reduces.
If the temperature differential between the actual
■
and set buffer temperature reduces, then the speed
of the boiler circuit pump reduces.
Function 6 combines the benefits of functions 2 & 5.
The heating water buffer cylinder is charged and dis-
charged optimally.
G
M
or 3A/3B
§
)
23