Viessmann PM1 Installation And Service Instructions Manual page 29

Setting parameters
20 Control voltage for pump OFF
Display
0 %
... %
Floating contact
Note
Example with parameters "20" to "25", "29" & "2A":
See Fig. 15, page 33.
21 Control voltage for pump min control range
Display
30 %
... %
Note
Example with parameters "20" to "25", "29" & "2A":
See Fig. 15, page 33.
22 Control voltage for pump max control range
Display
100 %
... %
Note
Example with parameters "20" to "25", "29" & "2A":
See Fig. 15, page 33.
(cont.)
Value
20:0
20:0
to
20:100
20:255
Value
21:30
21:0
to
21:100
Value
22:100
22:0
to
22:100
Commissioning and adjustment
Explanations
The control voltage controls the circulation pump.
The circulation pump is off at the set control voltage.
Setting range: 0 to 100 % control voltage
Note
If parameter "00:2" is set (pump type "GRUND-
FOS"), the default setting switches automatically to
"20:255".
Circulation pump is switched on and off via enable
contact .
hH
Note
Do not adjust for circulation pumps without enable
contact.
Explanations
Control voltage for lower circulation pump control
range limit
Setting range: 0 to 100 % control voltage
Note
If parameter "00:2" is set (pump type "GRUND-
FOS"), the default setting switches automatically to
"21:20".
Explanations
Control voltage for upper circulation pump control
range limit
Setting range: 0 to 100 % control voltage
Note
If parameter "00:2" is set (pump type "GRUND-
FOS"), the default setting switches automatically to
"22:90".
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