This Bonaire 120℃ overheat switch is a critical safety component for a range of ducted gas heaters, including Vulcan, Quasar, and Pyrox units. It's designed to reliably cut power if the heat exchanger or plenum temperatures exceed safe limits, preventing damage and potential hazards.

Replacing these on older units, especially after a blocked filter or poor airflow has caused a few trips, is just part of keeping homes warm and safe during the chilly Aussie winters.

Best For

• HVAC technicians and service teams working on Bonaire ducted gas heating systems.
• Owners performing maintenance on compatible Vulcan, Quasar, and Pyrox heaters.
• Apprentices learning gas heating system diagnostics and safety component replacement.

Compatibility

This overheat switch (Bonaire Part Number 2055821SP) is specifically designed for integration with:

• Bonaire Quasar units
• Vulcan 26mJ & 40mJ units
• Pyrox units

If you're running a different model, check fittings and specs before ordering.

Features

• Pre-set trip temperature of 120℃ for consistent safety cut-off.
• Direct replacement part, ensuring correct fitment and function for listed Bonaire, Vulcan, and Pyrox models.
• Essential safety device, protecting the heat exchanger and preventing overheating.
• Robust construction suitable for the demands of ducted gas heating environments.

Technical Specifications

What's in the Box

• One (1) Bonaire Vulcan Quasar Overheat Switch 120℃ (CTSPS2055821SP)

Using It on the Job

1. Always isolate power to the ducted gas heating unit at the main switchboard and perform a lockout procedure before starting any work.
2. Access the heater's control compartment and locate the existing overheat switch.
3. Carefully disconnect the wiring and remove the old switch, noting its orientation and mounting.
4. Install the new Bonaire 120℃ overheat switch (CTSPS2055821SP) in the same position, ensuring secure mounting.
5. Reconnect the wiring exactly as it was, checking for firm connections.
6. Restore power and test the heater's operation. Confirm the fan cycles correctly and there are no error codes.

Limitations & Safety Notes

• Always ensure power is isolated and locked out before servicing any electrical components.
• Only use this part for the specific Bonaire, Vulcan, and Pyrox models it is designed for. Incorrect application can lead to safety hazards.
• Regularly check your heater's airflow and filters to prevent nuisance trips from this switch, which indicates an underlying issue.
• Gas appliance servicing should ideally be performed by a qualified and licensed gasfitter.

Tradie Pro Tip

When you're swapping one of these out, take a good look at why the old one tripped. Is the filter choked? Are the ducts blocked? Don't just replace the switch; fix the root cause to save yourself a call-back.

Pair With

Pair with other Bonaire spare parts like fan motors or gas valves, and consider a combustion analyser for proper heater commissioning and safety checks.