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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.16.4 Control of the boiler/burner
For the boiler pump to be put into operation, a sufficiently great temperature differential
between boiler temperature and comparative temperature is required.
Figure 66: Control of the boiler /burner – delta T controller
Key
Line no. Meaning
8310 TKx Boiler temperature
Bx Current comparative temperature
On/Off Boiler pump (On/Off)
QX Relay output
SDoff Switching differential Off
SDon Switching differential On
t Time
T Temperature
If the boiler temperature exceeds the comparative temperature by the switch-on
differential, the boiler pump is activated:
Current boiler temperature > comparative temperature + temperature differential On.
If the boiler temperature drops by the switch-off differential below the comparative
temperature, the boiler pump is deactivated:
Current boiler temperature < comparative temperature + temperature differential Off.
For the boiler pump to be activated, the boiler temperature must have reached not only
the necessary temperature differential, but also Setpoint min (4110).
Note!
If pump overrun is parameterized, the boiler pump will not be deactivated until the
overrun time has elapsed.
Line no. Operating line
4130 Temp diff on
Switch-on temperature differential for control of the solid fuel boiler.
Line no. Operating line
4131 Temp diff off
Switch-off temperature differential for control of the solid fuel boiler.
Delta T-controller
Temp diff on
Temp diff off
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