Viessmann B2TB, Installation And Service Instructions For Contractors

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"Viessmann system number"
Setting Explanations
1 98:1 Viessmann system number
In conjunction with monitoring several systems via
Vitocom 300
... 98:1 to
98:5 System number adjustable from 1 to 5
"Recognition, extension DAP1"
Setting Explanations
Without 99:0 Never adjust
With 99:1
"Recognition, extension DAP2"
Setting Explanations
Without 9A:0 Never adjust
With 9A:1
"Set flow temperature for external demand"
Setting Explanations
70 °C 9B:70
... °C 9B:0 to
9B:127 Adjustable from 0 to 127 °C
Limited by boiler-specific parameters
"LON subscriber monitoring"
Setting
Explanations
20 min. 9C:20 If there is no response from a subscriber for 20 min,
the values specified in the control unit are used. Only
then will a fault message be issued.
... Min. 9C:2 to
9C:60 Adjustable from 2 to 60 min
"Differential temperature"
Setting Explanations
8 K 9F:8 The differential temperature is the value by which the
common flow temperature should be higher than the
highest currently required flow temperature of the
heating circuits with mixer.
Only in connection with heating circuit with mixer M2
(heating circuit 2) and M3 (heating circuit 3)
... K 9F:0 to
9F:40 Adjustable from 0 to 40 K
Boiler
Note
Parameter values in bold are factory settings.
Parameter level 2
General
(cont.)
5789 302 GB
Parameter