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Fröling Tm 500 Automatic pellet & Wood Chip Boiler

The Fröling TM 500 is a heavy-duty, fully automatic wood boiler engineered to burn a wide range of fuels, including wood pellets, dried wood chips and green wood chips up to 50% moisture content. Despite its compact footprint, the TM 500 features a full fire clay combustion chamber and a vertical heat exchanger with active scrapers for long-term efficiency.
Model Specs:
  • Fröling TM 500: 1.7MM BTU/hr
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Fröling TM 500 Features

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High-Temperature Chamber & Moving Grate
  • 4-layer fire clay combustion zone for clean burning
  • Jacket-cooled stoker duct reduces radiant heat loss
  • Moving grate ensures consistent combustion, even with low-grade or high-moisture fuels
  • Emissions <10 mg/MJ; rake-fed ash removal

 

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Vertical Heat Exchanger System
  • Upright design = self-cleaning functionality
  • Ash removed automatically by sturdy external augers
  • Integrated multi-cyclone dust separation
  • Efficiency Optimization System (EOS) tube cleaning
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Flue Gas Recirculation & Emissions Control
  • Automatic recirculation with speed-regulated fan
  • Progressive rotary valve for oxygen control
  • Reduces NOX and protects refractory linings
  • Optional FGR module optimizes performance with challenging fuels
PLC 4000 Controller and Software
  • User-friendly control: Clear interface with customizable settings and visualizations for efficient, stable operation.
  • Advanced functionality: Features include multi-sensor storage tank management, heating circuit and network temperature control, and cascade operation.
  • Flexible integration: Supports external output specifications plus monitoring and control of additional peripheral components.
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Best Suited For

Designed for high-demand, hands-off performance. The Fröling TM 500 is built for large-scale facilities that need reliable, low-emission heat with minimal daily maintenance.
  • Commercial facilities with high heat loads (schools, plants, hospitals)
  • Organizations reducing fossil fuel dependence
  • Operations using variable or low-grade biomass fuels
  • Projects seeking energy incentives or LEED certification
  • District heating systems and ESCO-managed networks
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Fröling TM 500 System Overview

  • Robust agitator head.
  • Maintenance-free agitator gearbox.
  • Strong spring blade ensures even filling of the feed screw.

  • Screw channel with progressive screw for smooth operation.

  • Ball joint for continuously adjustable inclination of the feed screw.
  • Patented twin-chamber rotary valve for top burn back protection.

  • Thermal storage tank.
  • Easy access to the sheer edge through an accessible opening.
  • Gravity shaft cover with safety cut-off switch.

10.  TM 500 wood chip boiler.

Heavy Duty Stoker and Flexible Ball Joint
The ball joint between the discharge screw and stoker allows up to 15° of flexible adjustment to fit tight spaces. The TM 500’s compact stoker unit and patented rotary valve ensure safe, efficient fuel feeding with top-tier burn-back protection. A shared energy-saving geared motor powers both components. For larger or uneven wood chips, an optional heavy-duty hydraulic ram feeder is available.
Patented Twin-Chamber Rotary Valve
The patented twin-chamber rotary valve ensures maximum safety and consistent fuel delivery. It separates the discharge and feed systems to prevent burn-back while optimizing combustion. Designed for larger wood chips (up to P45A), its replaceable cutting edges handle coarse pieces with ease. If resistance is detected, the system automatically reverses and retries. The rotary valve operates quietly and uses minimal energy.

Fröling Wood Chip Storage and Conveyance Systems

Fröling offers a range of woodchip feed systems engineered for smooth, efficient fuel delivery. From rotary agitators to inclined augers, these systems integrate seamlessly with the boiler for reliable, low-maintenance performance.

Spring Blade Agitator

  • Maintenance-free system with up to 18′ (5.5 m) working diameter
  • Ideal for free-flowing fuels like wood pellets and wood chips (P16A/P45A to M35)
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TGR/SGR Articulated Arm Rotary Agitator

  • Patented, maintenance-free system with up to 19.5′ (6 m) working diameter
  • Built for low-flow fuels that need higher discharge power
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Rotary Agitator Discharge Systems with Separate Drive

  • Independent drive allows flexible installation and adjustable feed output
  • Discharge screws can be installed on either side of the agitator
  • Optional extra-long screws efficiently pull fuel from the back of the storeroom
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Inclined Screw Discharge Unit

Mainly used as a silo discharge screw in the wood-processing industry. Ensures even and reliable fuel feed from high silos.
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Horizontal Screw Discharge Unit

Solid construction to withstand extremely high feed loads when feeding from high silos. This is used for shavings and for large diameter bunkers.
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Hydraulic Scraper Floor

  • Ideal for rectangular storage rooms
  • Compatible with all common biomass fuels
  • Sturdy pusher unit, perfect for large wood chip storerooms

 Fröling Connect: Remote Monitoring

Stay in control with Fröling Connect, cloud-based boiler monitoring software that lets users adjust settings, track performance, and receive alerts from any device.
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FAQ's about the Fröling TM 500

The TM 500 is built for large-scale heating needs, making it ideal for commercial buildings, manufacturing facilities, agricultural operations, and district heating networks. Its robust design ensures reliable performance even under continuous, high-demand operation.
This model is optimized for wood pellets and wood chips up to 50% moisture content, giving operators flexibility in sourcing fuel.
The TM 500 uses Fröling's advanced PLC control system, which provides automated combustion management, heat output regulation, and integration with building management systems. Operators can monitor and adjust settings locally via a touchscreen or remotely through networked controls.

Downloadable Resources for the Fröling TM 500

TM 500 Brochure

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TM 500 Installation Instructions

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TM 500 Operating Instructions

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TM 500 Product Overview

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