Overview
The Field Controls 01170004 FTS-4 is a thermal safety switch engineered to protect gas furnaces and boilers from dangerous flue gas spillage. This switch efficiently detects flue gas spillage due to a blocked flue, continuous down drafting or inadequate draft condition. With the safety switch wired in series with the burner circuit, the switch will de-energize the system’s burner or burner control once it senses the spillage of hot flue gases. Manual reset design requires deliberate operator intervention, ensuring that any spillage event is investigated before restart.
Key Features
- Designed for use on large gas furnaces and boilers
- Can be mounted on Draft Hood or double-acting Barometric Draft Control (both brackets included)
- Manual reset operation for safety verification before restart
- Single Pole Single Throw (SPST) normally closed contact configuration
- Thermostatic sensing element for reliable spillage detection
Technical Specifications
The FTS-4 delivers critical safety specifications for high-capacity furnace and boiler applications:
- Trip Temperature: 140°F
- Voltage Rating: 120/240V dual-voltage compatible
- Contact Rating: 12/6 Amp (120V/240V respectively)
- Contact Type: Single Pole Single Throw (SPST), normally closed
- Reset Type: Manual reset
- Mounting: Draft Hood or Barometric Draft Control compatible
- Application BTU Threshold: 400,000 BTU/hr and above
Typical Applications
The Field Controls FTS-4 is commonly used in:
- Large residential and commercial gas furnaces over 400,000 BTU/hr
- Gas-fired boiler systems requiring spillage detection
- Draft hood and barometric draft control assemblies
- HVAC safety control circuits where flue gas detection is mandated by code
- Retrofit installations on existing furnace and boiler equipment
Compatibility & Replacements
Compatible With
- Large gas furnaces (400,000+ BTU/hr)
- Gas-fired boiler systems
- Draft hood assemblies
- Double-acting barometric draft controls
- 120/240V burner control circuits
- Standard HVAC control wiring
Replaces / Drop-In Replacement For
- Verify compatibility with your specific furnace or boiler model before ordering. Consult manufacturer documentation or your system integrator for direct replacement confirmation.
Works With
- Standard 24V/120V/240V HVAC control systems
- Burner control modules and relays
- Furnace and boiler safety interlocks
- Thermostatic control circuits
