Subscriber Numbers Of Connected Extensions - Viessmann B1HF Installation And Service Instructions Manual

Parameter
(cont.)
2426.2 Room temperature-dependent heating circuit pump logic (only for weather-compensated control
units with room temperature hook-up).
Setting
Only activate this function for the heating
circuit with mixer or if there is only one di-
rect heating circuit in the system.

Subscriber numbers of connected extensions

All extensions connected to the heat generator (except
the SDIO/SM1A electronics module) must have a sub-
scriber number. The subscriber number is set on rotary
switch S1 at each extension.
Observe maximum number of PlusBus subscribers,
see note in chapter "Connection".
Fig. 40
System configuration (parameters)
Explanations
If the actual room temperature is above the threshold
value (selected set room temperature plus hysteresis
in K), the heating circuit pump is switched off.
If the actual room temperature is below the threshold
value (selected set room temperature plus hysteresis
in K), the heating circuit pump is switched on.
Rotary switch S1 settings:
EM-S1 extension (system with solar collectors): 0
■
EM-EA1 extension (max. 1 extensions in one sys-
■
tem)
Note
On the EM-EA1 extension, select 1 if the "External
heating circuit hook-up" function is being set for
more than one heating circuit.
EM-P1 extension
■
– If no heating circuits with mixer are available in the
system: 1
– If heating circuits with mixer (EM-M1 or EM-MX
extensions) are present in the system: Always set
subscriber number for EM-P1 extension to the con-
secutive number after EM-M1 or EM-MX exten-
sions.
■ EM-M1 or EM-MX extensions
– Heating circuit 2 with mixer: Rotary switch on
extension kit to 1
Note
EM-EA1 extensions may have the same subscriber
number as the EM-P1, EM-M1 or EM-MX extensions.
The following table shows an example of how a sys-
tem may be equipped.
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