Name: BT300 burner control unit
Brand: LAMTEC

Burner Control Systems

LAMTEC · BT320 · BT330 · BT331 …

≤ 3 actuators
Burner-mounted
SIL3 (BT331, BT341)

BurnerTronic BT300 merges electronic fuel-air ratio control and an electronic burner sequencer in a single device designed to be fitted directly on the burner. Depending on the type, it drives 2 or 3 actuators; valve leakage testing, flame monitoring, flue gas recirculation and counters for operating hours and burner starts are part of the basic version.

Load control, variable speed for the combustion air fan, dual-fuel operation and fieldbus connectivity can be added later through extension modules on the LAMTEC SYSTEM BUS (LSB). O₂ trim control additionally requires an LT1, LT2, LT3 or LT3-F lambda transmitter; adaptive CO/H₂ combustion optimisation (SIL2) is also available.

Six types are available: BT320 (2 actuators), BT330 and the SIL3-approved BT331 (3 actuators), BT335 for simple oil/gas dual-fuel firing without a DFM300, and BT340 plus the SIL3-approved BT341 for dual-fuel operation with DFM300. Continuous operation calls for a flame sensor approved for it; BT320 itself is approved for continuous operation from version 3.9.0.0.

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Benefits

BT300 burner control unit

Mounted directly on the burner: short cable runs and plug-in actuators cut installation time and wiring errors
Up to 3 actuators for fuel-air ratio control, depending on type; VSM100 adds fan speed control or a fourth channel
Integrated flame monitoring and a valve leakage test that can run before ignition or after burner shutdown
Language-neutral parameter setting with symbols on the UI300 panel, or from a PC with LSB Remote Software
Start with or without a pilot burner; gas burners can start without pre-purge in line with EN 676
O₂ trim control and adaptive CO/H₂ combustion optimisation (SIL2)
Optional load control and connection to plant automation via PROFIBUS DP, Modbus TCP or PROFINET
SIL3 to DIN EN 61508 and PL e to DIN EN ISO 13849-1 on BT331 and BT341

Modules

BT300 burner control unit

DFM300 dual-fuel module

Lets BT340 and BT341 fire dual-fuel burners on oil/gas or gas/gas. For the fuel in use, it switches the valve and ignition transformer outputs over to the components for that fuel, and it can change over the burner safety chain input as well. It connects over LSB and needs at least one LCM100 or LEM100.

VSM100 speed module

Adjusts the combustion air fan speed through a frequency inverter across the whole firing range, which lowers power consumption, fan motor wear and noise in the boiler room. Feedback comes from a NAMUR sensor, a 3-wire sensor or an analogue signal; alternatively, a fourth actuator can be connected via 4–20 mA. It works with every BT300 type.

LCM100 load control module

Provides PID load control based on temperature from PT100/PT1000 sensors or on pressure from a 4–20 mA sensor, with switching between two setpoints via a digital input and setpoint correction by outdoor temperature. It adds temperature inputs (3 × PT100/PT1000) for the boiler, outdoor air and flue gas, pulse inputs for fuel meters, a 4–20 mA firing-rate output, an LSB gateway and a 24 V DC supply for external sensors.

LEM100 LSB extension module

Adds an LSB (CAN) interface to BT300 so that further BT modules can be connected, and electrically isolates the BT300 output from those modules. It is the lower-cost alternative to LCM100 when only an LSB connection is needed, and requires a separate 24 V DC SELV supply.

BT320 · BT330 · BT331 · BT335 · BT340 · BT341

Key specifications

General data

Specification	BT300
Supply voltage	230 / 115 V AC +10/-15 %, 47–63 Hz
Power consumption	≤ 30 VA
Interfaces	LSB · PROFIBUS DP, Modbus TCP, PROFINET (optional)
Flame detection	Ionisation · UV (KLC1000, KLC2002) · F152, F200K, F300K
Degree of protection	IP00 (housing) · IP20 (terminals uncovered)
Ambient temperature	-20 … +60 °C

Type comparison

Specification	BT320	BT330 / BT331	BT335	BT340 / BT341
Fuels	Oil or gas	Oil or gas	Dual fuel	Dual fuel (DFM300)
Fuel-air ratio channels	2	≤ 3	≤ 3	≤ 3
Operating mode	Intermittent · Continuous (≥ V3.9.0.0)	Intermittent · Continuous	Intermittent · Continuous	Intermittent · Continuous
Safety integrity level	—	SIL3 (BT331)	—	SIL3 (BT341)

Full technical data: data sheet(opens in a new tab)

Approvals and standards

CE declaration of conformity (2014/35/EU, 2014/30/EU, 2014/68/EU, (EU) 2016/426, 2011/65/EU)
EU type examination certificate — 2014/68/EU, Module B (pressure equipment)
EU type examination certificate — (EU) 2016/426 (gas appliances)
SIL3 — DIN EN 61508 (BT331, BT341 only)
PL e — DIN EN ISO 13849-1 (BT331, BT341 only)
DIN EN 298
DIN EN 1643
DIN EN 12067-2
DIN EN 13611
ISO 23552-1
DIN EN 50156-1
DIN EN 50156-2
UL 1998 (US)
UL 372 (US)
UL 353 (US)
CSA C22.2 No. 199 (CA)
AS 4625-2008

Accessories

UI300-V2 user interface: panel-mounted graphic display supplied with connecting cable
UI300-LSB user interface: graphic display panel for the LSB bus, with 2.5 m cable
Additional cover that raises the UI300 panel to IP65
PBM100 fieldbus module for a PROFIBUS DP connection; requires an LCM100 or LEM100
EBM102 fieldbus module for a Modbus TCP connection; requires an LCM100 or LEM100
EBM112 two-port fieldbus module for a PROFINET connection; requires an LCM100 or LEM100
LSB Remote Software for setting up BT300 from a PC; the kit includes a USB/CAN module, an LSB service adapter and a cable