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8 Options
The DFM300 is an expansion module that enables operation of dual-fuel burners in combina-
tion with BurnerTronic BT340.
Depending on selected fuel, the module switches valve outputs and ignition transformer out-
put of BT300 to valves and ignition transformer for selected fuel.
In addition, DFM300 can switch over to ’burner safety interlock chain’ input of BT300. This al-
lows safety chain devices of currently inactive fuel (e.g. oil pressure monitor during gas oper-
ation) to be open.
The DFM300 is connected to BT300 via LSB (LAMTEC SYSTEM BUS). DFM300 is providing
a 230/120 VAC input for selection of current fuel.
NOTICE
Use VSM and DFM only with BT300 software version 3.0.0.0 or higher. Software versions be-
fore 3.0.0.0 do not support all necessary safety functions.
Connect dual-fuel module DFM300 via (LSB) LAMTEC SYSTEM BUS to the BT34x.
To insulate LSB from potential power supply voltage of BT34x, a LCM100 or a LEM100 with
external power supply 24 VDC SELV will be needed. This is provided by DFM with 24 VDC
via LSB.
Configure DFM300 by DIP switch.
NOTICE
The oil pressure monitor must be integrated into the safety interlock chain oil. For the purpos-
es of leakage test the gas pressure monitor must be integrated in the pressure monitor input
of BT300.
NOTICE
Before using the device, the parameters P0525, P0801 and P0812 must be set in the BT300.
Starting with version 3.9.0.0, the BT340, in combination with the DFM300, is able to control
and monitor burners with oil and gas as well as burners with two gases. For oil and gas burn-
ers, oil is always assigned to curve set 1 and gas always assigned to curve set 2. For this ap-
plication, oil and gas have different drains and different safety times. For dual-fuel application
with two gases, there is only one drain for both gases. Thus, both gases do/do not have a
valve leakage control. Moreover, for both gases, it takes place at the same point of the oper-
ating sequence of the burner. The safety times for both gases are the same as well. The pres-
sure switch entry for minimal gas pressure has to be toggled via the DFM300 from the
respective gas channel gas 1 or gas 2. See chapter 8.2.3.2 Terminal Assignment
8.2 Dual Fuel Module DFM300
NOTICE
Use DFM300 only in combination with BT340.
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