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Building Technologies Division
Basic documentation LMV36...
CC1P7544en
Infrastructure & Citiies Sector
18 Connection to superposed systems
25.09.2013
Note
Fuel changeover on the basic unit.
After a change of fuel, the BAC system must rewrite the predefined target output. A
change of fuel can be detected by cyclic sampling of the type of fuel currently burnt.
General setting values for connection of the basic unit to building automation (for factory
settings, refer to the
Parameter list
):
Bus communication may only be interrupted for the time set.
If communication is disturbed for a longer period of time, the LMV36... basic unit delivers
a fault status message and the values set in the basic unit by building automation are
reset.
No. Parameter
141
Operating mode BACS
0 = off
1 = Modbus
2 = reserved
142
Setback time in the event of communication breakdown
Setting value:
0 = inactive
1…7200 s
148
Default output if communication with building automation is interrupted
Setting values:
For
modulating operation
the setting range is as follows:
0…19.9 = burner OFF
20…100 = 20…100% burner rating
For
multistage operation
, the following
settings apply:
0 = burner OFF, P1, P2, P3
Invalid = no default output from building automation
Default setting:
Invalid
149
Fuel 1: Default output if communication with building automation is
interrupted
Setting values:
For
modulating operation
the setting range is as follows:
0…19.9 = burner OFF
20…100 = 20…100% burner rating
For
multistage operation
, the following
settings apply:
0 = burner OFF, P1, P2, P3
Invalid = no default output from building automation
Default setting:
Invalid
The factory settings of the parameters are shown on the
Parameter list
.
Note
For a detailed description of parameters 148 and 149, refer to chapter
Default output
via building automation
.