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Brand: Honeywell
Honeywell R4343E1014 Flame Switch (Flame Relay) for UV Sensors
Description
Overview
The Honeywell R4343 is a plug-in flame switch (flame relay) for intermittent operation that indicates the presence or absence of a flame in commercial and industrial burner installations; the R4343E models, such as the R4343E1014, are for use with Honeywell C7027, C7035 and C7044 UV sensors. In a burner management system the flame switch evaluates the flame signal from the sensor and switches its relay contacts accordingly, while the start-up sequence and fuel valve control are handled by the associated burner control. Honeywell lists the R4343 flame switch as discontinued (product discontinuation December 2022, service support until December 2027), and it is not approved for new installations in Europe, so it is supplied as a spare part.
The R4343 is part of the Honeywell flame safeguard range covering burners from small packaged units to large industrial systems, with common mounting and wiring practices. Flame safeguard controls are required by burner safety standards and are subject to regular inspection in plants
Engineering and Design
The R4343E evaluates the signal of a Honeywell C7027, C7035 or C7044 UV sensor (R4343D models are for rectification-type sensors such as flame rods and C7012A/G UV sensors), and a jack socket on the front permits measuring the flame signal with a microampere meter. On loss of flame the relay responds within its flame failure response time, which depends on the model (less than 1 second or less than 2 seconds), and its contacts signal the loss of flame to the burner control.
The relay plugs into a subbase for surface mounting (housing IP40) and provides a double-pole changeover (DPDT) contact output rated 2 A at 0.65 power factor. With the flame safeguard range covering single and multi-burner systems in boilers, process heaters and air heaters, the R4343 supports the operator’s requirement for reliable flame supervision and long service life in continuous industrial duty.
The R4343 is part of the Honeywell flame safeguard range covering burners from small packaged units to large industrial systems, with common mounting and wiring practices. For plant maintenance teams the plug-in design and the front jack socket for flame signal measurement simplify troubleshooting and relay replacement. The R4343 series is available for 115 Vac and 230 Vac (+10 % to -15 %), 50/60 Hz supplies depending on model, and the R4343E (UV sensors) and R4343D (rectification-type sensors) versions let plants match the relay to the sensor in use. Flame safeguard controls are required by burner safety standards and are subject to regular inspection in plants. The R4343 is CE approved according to EN 298 for intermittent operation. This reliability, together with simple panel wiring and proven flame sensing, explains the long service life of the Honeywell flame safeguard range in boiler houses.
Key Features
- Flame supervision for gas and oil burners
- Plug-in design that mounts onto a subbase
- Flame signal evaluation for Honeywell UV sensors (R4343E) or rectification-type sensors (R4343D)
- DPDT relay output, 2 A at 0.65 power factor
- Front jack socket for flame signal measurement with a microampere meter
- Established Honeywell burner control range
Applications
The R4343 is applied in boiler burners, process heaters, air heaters and other fired equipment in industrial, power and marine installations for safe burner management.
Specifications
| Type | Flame switch (flame relay) for intermittent operation, plug-in |
| Application | gas and oil burner supervision |
| Flame sensing | R4343E: Honeywell UV sensors C7027, C7035, C7044; R4343D: rectification-type sensors (flame rods, C7012A/G UV) |
| Safety | CE approved according to EN 298 (intermittent operation) |
| Mounting | Plug-in, mounts onto a subbase for surface mounting |
| Duty | Intermittent operation |
| Supply voltage (R4343 series) | 115 Vac or 230 Vac (+10 % to -15 %), 50/60 Hz, depending on model |
| Contact output | 1 × DPDT (double-pole changeover), 2 A at 0.65 power factor |
| Enclosure rating | IP40 |
| Ambient temperature | -10 °C to +60 °C |
| Maximum humidity | 90 % RH |
| Flame signal test | Front jack socket for a microampere meter (0-10 µA minimum scale) |
| Approval | CE according to EN 298 (intermittent operation) |
R4343D and R4343E Versions
Honeywell offers the R4343 flame switch in two versions that differ in the flame sensor they evaluate. R4343D models are for rectification-type flame sensors, such as flame rods and C7012A/G UV sensors. R4343E models, including the R4343E1014, are for Honeywell UV sensors C7027, C7035 and C7044. Selecting the right letter matters, because a relay built for one sensor type is not interchangeable with the other. Check the existing sensor type before ordering a replacement.
The R4343 plugs into a subbase for surface mounting and its housing meets IP40. A jack socket on the front allows the flame signal strength to be measured with any suitable microampere meter, with a 0-10 µA minimum scale, which makes commissioning and routine checks straightforward. The relay is intended for intermittent operation, provides a DPDT contact output and is CE approved according to EN 298.
Why Seven Star LLC
Seven Star LLC supplies Honeywell flame switches and flame safeguard components, including the R4343, for boiler and process heater installations in Oman and the GCC. Because a flame switch is part of the burner safety chain, we treat sourcing verification with particular care, confirming the exact wiring configuration and burner sequence compatibility against your existing system before shipment, since a mismatched control installed into a live burner management system can compromise the safety interlock it is meant to provide. Our team verifies these details with your combustion engineers before your order is confirmed, and we are transparent when a specific R4343 variant is difficult to source, rather than substituting a similar-looking control without confirming true compatibility.
For facilities operating multiple boilers or process heaters with R4343 controls in service, we also help plan spares coverage around scheduled maintenance and safety inspection intervals, so a control replacement is a planned event rather than a reactive scramble during a burner shutdown. If your facility is evaluating whether to continue supporting this generation of flame switch or begin planning a migration to a currently supported Honeywell platform, we are glad to be part of that conversation with honest guidance based on your actual burner configuration. Flame safeguard controls are subject to periodic testing and functional checks as part of most facilities’ safety management programs, and we can advise on realistic test intervals and documentation practices for the R4343 based on industry norms, while being clear that your facility’s own safety management system and any applicable regulatory requirements take precedence over general guidance.
Where a facility is unsure whether an existing R4343 in service is still functioning within its original specification, we recommend a qualified combustion technician perform a full functional test before assuming a control needs replacement, since an apparent nuisance trip is sometimes a wiring or sensor issue elsewhere in the burner management system rather than a fault in the control itself. We are happy to discuss what we know about common failure patterns for this control family, while always deferring the final safety determination to your own qualified personnel and the codes and standards that specifically govern your facility, its particular equipment, and the specific jurisdiction it happens to operate within, at all times, without any exception whatsoever.
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About brand
Fixed gas and flame detection takes up the largest share of our Honeywell listing: Searchline Excel open path detectors, Sensepoint XCD and XRL point detectors, the XNX transmitter and the FS24X Plus flame detector. Honeywell, which dates from 1906 and is headquartered in Charlotte, USA, also makes SmartLine pressure transmitters and VersaFlow flowmeters for process plants.
Seven Star LLC is an independent supplier of Honeywell gas detectors, replacement sensors, transmitters and controller parts for sites in Oman and the GCC.
Honeywell product families on this page
Open path infrared detection is represented by the Searchline Excel and the newer Searchline Excel Plus. Point detection includes the Sensepoint XCD in flammable and toxic versions, for example the SPXCDALMG1 hydrogen detector, the Sensepoint XRL and the XNX universal transmitter. The FS24X Plus is a triple infrared flame detector. Replacement cells such as the SR-X2V oxygen sensor and the SR-W-MP75C MICROpeL combustible sensor are also listed. Process instruments include SmartLine STG700 and STG800 gauge pressure transmitters, the STR82D remote seal transmitter and the VersaFlow Coriolis mass flow meter. Recorder consumables such as chart pens are also sourced.
Where Honeywell detectors and transmitters are used
Gas and flame detectors guard wellheads, compressor stations, tank farms, loading bays, process units and utility buildings, and report to the fire and gas system. Open path units watch plant boundaries and long pipe racks. SmartLine transmitters and VersaFlow meters measure pressure and flow in refining, gas processing, chemicals and power.
Ordering Honeywell gas detection parts: what we need
Send the full part number from the label, such as SPXCDALMG1 or 02104-N-XSSA, and the serial number. For gas detectors state the target gas and measuring span, housing material, cable entry thread, output (4-20 mA, relays, Modbus) and the approval required. For replacement sensors name the detector model they go into. For SmartLine transmitters send the complete model selection string.
Browse Honeywell products by category: Fire & Gas Detector, Vibration, Flowmeters, Pressure Instrumentation, Temperature Instrumentation.
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Frequently Asked Questions
What is the Honeywell R4343?
The R4343 is a plug-in flame switch (flame relay) for intermittent operation. It indicates the presence or absence of a flame; the R4343E version is for Honeywell C7027, C7035 and C7044 UV sensors and the R4343D version for rectification-type sensors.
What does a flame switch do?
It evaluates the flame signal from the sensor and switches its relay contacts accordingly. The start-up sequence and fuel valve control are handled by the associated burner control.
How is the flame detected?
The R4343E is used with a Honeywell UV sensor (C7027, C7035 or C7044). A front jack socket allows the flame signal to be measured with a microampere meter.
What happens on flame failure?
The relay responds within its flame failure response time, which depends on the model, and its DPDT contacts signal the loss of flame to the burner control.
Where is the R4343 used?
It is used in commercial and industrial burner installations where a flame relay is paired with a burner control, for example boilers, process heaters and air heaters.
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