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Building Technologies Basic documentation LMV37.4... CC1P7546en
9 Connection to load controllers 17.12.2018
Behavior in the event the building automation and control system fails
If the LMV37.4 receives no more data from building automation, it will deliver the output
set with parameter 148.
The time that elapses until communication breakdown is detected can be set via
parameter 142.
No. Parameter
142
Setback time in the event of communication breakdown
Setting value:
0 = deactivated
1…7200 s
148
Predefined output in the event of communication breakdown with building
automation
Setting values:
For modulating operation, the setting range is as follows:
0…19.9 = burner off
20…100 = 20…100% burner output (20 = low-fire position)
For multistage operation, use the following settings:
0 = burner OFF
P1...P3 = stage 1...stage 3
Invalid = no output predefined by the building automation system in the event
of communication breakdown
Default setting: Invalid
Setting choices:
a) Set output specification in parameter 148 to undefined (--).
In the event communication breaks down, the last valid preselected output is
maintained. The next load controller activated in accordance with the priority
(refer to chapter Prioritization of load controller sources) ensures control from
this output position.
b) Output preset via parameter 148 set to 0, 20…100%, or parameterized as
multistage:
If communication breaks down, the output requested by the building automation
system is set invalid and the output set via parameter 148 is delivered.
Note
In that case, outputs via load controllers with a priority lower than that of the
building automation system cannot be delivered.
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