This is a genuine SIT Sigma 845 modulating gas valve, a critical spare part for Bonaire Vulcan ducted gas heaters, ensuring steady and efficient burner operation.

In Australian heating systems, reliable gas valves like this are essential for safety and consistent warmth, especially during cooler months. Replacing a faulty gas valve means you're not just restoring heat; you're often fixing intermittent firing issues or a system stuck on a low flame, which can be a real headache on a cold morning.

Best For

• HVAC service technicians
• Gas appliance repair specialists
• Owners of Bonaire Vulcan ducted gas heaters needing a direct replacement

Compatibility

This SIT Sigma 845 valve is specifically designed as a direct replacement for Bonaire Vulcan ducted gas heaters, corresponding to Bonaire Part Number 5310702SP. It's a 230-240V modulating valve.

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

Features

• SIT Sigma 845 Modulating Gas Valve: Provides precise control over gas flow for optimal burner performance and efficiency.
• 230-240V Operation: Designed for compatibility with standard residential and light commercial power supplies in Australia.
• Direct OEM Replacement: Specifically engineered as a direct fit for Bonaire Vulcan heaters (Bonaire PN 5310702SP).
• Genuine SIT Component: Ensures reliability, long service life, and seamless integration with original heater specifications.

Technical Specifications

What's in the Box

• 1 x Bonaire SIT Sigma 845 Modulating Gas Valve (ST0845052)

Using It on the Job

1. Always isolate power to the ducted gas heater at the main switchboard and ensure proper lockout/tagout procedures are followed.
2. Shut off the gas supply to the appliance before disconnecting any gas lines. Verify zero pressure in the line.
3. Carefully remove the old gas valve, noting all electrical and gas connections.
4. Install the new SIT Sigma 845 valve, ensuring all gas connections are correctly sealed and tightened to manufacturer specifications.
5. Reconnect electrical wiring as per the heater's wiring diagram.
6. Restore gas supply, check thoroughly for leaks using an approved leak detection solution, then restore power and test the heater's operation across all settings.

Limitations & Safety Notes

• Installation and servicing of gas appliances must be performed by a currently licenced gasfitter in Australia.
• Ensure gas and electrical supplies are isolated and verified safe before commencing any work.
• Only compatible with the specific Bonaire Vulcan models that use Bonaire PN 5310702SP. Always double-check your existing part number.
• Always follow the manufacturer's installation instructions and local gas safety regulations.

When swapping out these modulating valves, always double-check your wiring against the heater's schematic. Sometimes, a wire can look similar, but getting it wrong can cause control board errors or incorrect flame modulation. A quick photo before you start can save a lot of grief.

Pair With

Pair with gas leak detection spray and a digital multimeter for checking voltage and signals during installation and commissioning. Consider also grabbing some thread sealant for your gas connections.