Honeywell TMG740-3 Mod. 43-45 Burner Control Box

Automatic Burner Control Unit for Forced-Draught and Dual-Fuel Burners

1. Product Overview

The Honeywell TMG740-3 Mod. 43-45 is an electronic-mechanical burner control box designed for medium- to high-performance forced-draught and dual-fuel gas/oil burner systems.

The TMG740-3 controls and monitors the burner operating sequence, including prepurging, ignition, fuel-valve operation and flame supervision. It can be used with ionization probes, UV flame sensors, and infrared flicker detectors, making it suitable for different burner flame-monitoring configurations.

The Mod. 43-45 version is one of the timing configurations within the TMG740-3 series. It is intended for burner systems requiring the corresponding programmed sequence times.

2. Key Features

• Honeywell Satronic TMG740-3 burner control technology
• Automatic burner sequence control
• Suitable for forced-draught burners
• Suitable for gas, oil and dual-fuel burners
• Supports single-stage and two-stage burner operation
• Can be used for multi-stage or modulating burners
• Ionization, UV and infrared flame detection
• Integrated flame signal indication
• Plug-in control box design
• Mechanical cam-driven program sequence
• Reliable flame failure monitoring
• Suitable for industrial heating and combustion systems

3. Technical Specifications

Brand: Honeywell / Satronic

Model: TMG740-3 Mod. 43-45

Product Type: Automatic Burner Control Box

Application: Gas / Oil / Dual-Fuel Burner Control

Burner Type: Forced-Draught Burner

Operation: Intermittent Operation

Flame Detection: Ionization Probe / UV Sensor / Infrared Flicker Detector

Supply Voltage: 220/240 VAC

Frequency: 50 Hz

Permissible Frequency Range: 40–60 Hz

Power Consumption: Approximately 15 VA

Maximum Output Current: 4 A per output terminal

Total Output Current: 6 A

Fuse: 10 A fast / 6 A slow

Ionization Input Sensitivity: Approximately 1.6 μA

UV Input Sensitivity: Approximately 70 μA

Protection Rating: IP44

Ambient Temperature: -20°C to +60°C

Weight Including Base: Approximately 1.1 kg

Mounting Position: Any position

The TMG740-3 documentation specifies EN 298 classification and provides flame-signal indication through a five-stage LED display.

4. Program Sequence

For the TMG740-3 family, the 43-35 timing version is documented with approximately 32 seconds supervised prepurge, 40 seconds prepurge with air damper open, 4 seconds pre-ignition, and 3 seconds start-valve safety interval. The exact timing configuration should be verified against the complete nameplate/model designation before replacement.

Important: Your designation is Mod. 43-45, while the Honeywell/Resideo documentation I found clearly identifies 08218U as TMG740-3 Mod. 43-35. Therefore, I would not recommend treating 43-45 as identical to 43-35 without checking the nameplate or original datasheet.

5. Applications

The Honeywell TMG740-3 is suitable for:

• Industrial gas burners
• Oil burners
• Dual-fuel burners
• Forced-draught combustion systems
• Industrial boilers
• Process furnaces
• Heating systems
• Direct-fired air heaters
• Thermal processing equipment
• Industrial combustion control systems

6. Advantages

The TMG740-3 provides an integrated solution for burner sequencing and flame safety supervision.

Its plug-in construction makes installation and replacement convenient, while the front-panel program indicator and flame-signal LEDs help operators monitor burner status and troubleshoot flame-related problems.

The controller can accommodate different flame detection technologies, giving it flexibility for older and existing industrial burner installations.

7. Why Choose Us

• Honeywell / Satronic burner control products
• Professional combustion-control product supply
• Stable stock availability
• Competitive pricing
• Technical datasheet support
• Fast international shipping
• OEM and bulk order support

8. Packaging & Delivery

Standard export packaging with protective materials is used to protect the burner control box during transportation.

Stock products can be dispatched by international express, air freight, or other suitable shipping methods.

9. Inquiry Now

If you are looking for Honeywell TMG740-3 Mod. 43-45 Burner Control Box, please provide a photo of the nameplate if possible. I can further verify the exact Mod. 43-45 timing, voltage version, and replacement model before you publish the product listing.