Central Heating Backup Mode; Supply Air Minimum Limit For Heating; Filter Contamination Fault Trigger; Active Filter Monitor - Wolf BML Operating Instructions Manual

Backup mode, heating
Supply air minimum limit
for heating
Filter contamination
fault trigger

Active filter monitor

Fan run-on time

External ON/OFF

Additional functions
34
Standard functions
If backup mode is enabled, and the current room temperature
falls below the backup temperature (DEFAULT SETTING),
the fan is run at the preselected speed and HR and the
reheater are activated. Once the current room temperature
rises 1 K above the backup temperature, everything stops
again.
Relevant parameters:
Program selector, time program, in OFF mode, backup
temperature, night mode
If the supply air temperature (temperature of air blown in)
falls below the set minimum limit value, the heating mixer is
activated (100 %) (HR and reheater coil).
The heating modules are not switched off again until the
temperature has risen above the set value.
In addition, if the supply air temperature falls below the
minimum limit, the current fan speed is set to the minimum
speed (parameter LM 015) after 900 s have elapsed. If the
supply air minimum limit then ceases to be active, the fan
speed is returned to its nominal speed.
If the supply air minimum limit is still active after 5 minutes
despite the speed reduction, a fault message is issued (and
the system shuts down).
This will be reset automatically once 5 hours have elapsed or
when the fault is acknowledged on the BML.
Parameters LM202 and LM203 can be used to activate a filter
fault by means of the number of hours of fan operation.
A differential pressure cell can be used to trigger a fault
message when the filter is dirty; see parameter LM200.
To prevent re-heating by the electric heater coil, the fan stops
only after a run-on time of 45 seconds after system shutdown.
An on-site contact can be used to switch the system on and
off within the time program.
Contact closed:
System runs according to the time program
Contact open:
System switched off by time program
If the system is always going to be operated via the external
switch, the time program must be enabled 24 hours a day
The additional functions of the controller are described below.
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