This Bonaire SIT 840 Sigma Gas Valve (ST0840017) is a crucial replacement part for keeping Bonaire heating systems running safely and efficiently. If you've been troubleshooting a heater lockout or an erratic flame, a faulty gas valve is often the culprit. Getting the right genuine or compatible replacement like this one saves you a return trip to the job site and keeps your customer's heating running smoothly, especially during a cold snap.

It's engineered to precise specifications, ensuring a reliable fit and long service life in demanding Australian conditions, from residential installations to light commercial applications.

Best For

• HVAC technicians servicing Bonaire ducted gas heating systems.
• Authorised Bonaire service agents.
• Gas fitters replacing faulty heating appliance valves.

Compatibility

• Direct replacement for Bonaire Heating Systems with Part Number 5310701SP.
• Corresponds to SIT Part Number 0840017 (Sigma 840 series).
• Operates on 230V 50Hz electrical supply.

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

Features

• SIT Sigma 840 Design: A robust and proven gas valve series for reliable flame control.
• Standard Power: Designed to operate efficiently on a 230V 50Hz power supply, common in Australian installations.
• OEM Part Match: Identical to Bonaire PN 5310701SP, ensuring perfect fit and function as a genuine replacement.
• Cross-Reference: Matches SIT PN 0840017 for easy identification and sourcing.

What's in the Box

• 1x Bonaire SIT 840 Sigma Gas Valve (ST0840017)

Using It on the Job

1. Isolate Power & Gas: Always switch off the main power to the heating unit at the switchboard and shut down the primary gas supply. Apply lockout/tagout procedures.
2. Depressurise & Disconnect: Verify gas lines are depressurised, then carefully disconnect the existing gas valve, noting all electrical and gas connections.
3. Install New Valve: Mount the new Bonaire SIT 840 Sigma Gas Valve, ensuring all gas connections are made with appropriate thread sealant and torqued correctly.
4. Reconnect Electrics: Reconnect all electrical wiring as per the manufacturer's schematic.
5. Leak Test & Commission: Restore gas supply, check all connections thoroughly with an approved gas leak detector solution. Then, restore power, follow commissioning steps for the heating unit, and perform a full functional test.

Limitations & Safety Notes

• Installation and servicing of gas appliances must be performed by a currently licensed gas fitter in accordance with Australian standards and local regulations.
• Always ensure power and gas supplies are isolated before commencing any work on the appliance.
• Thoroughly leak-test all gas connections after installation to prevent hazards.
• Only use this valve on compatible Bonaire heating systems with the specified part numbers.

Before replacing a gas valve, always double-check all pressure switch operations and control board signals. Sometimes, a lockout can be caused by something simpler, but if you've ruled those out, a worn valve can be the root cause of inconsistent heating or complete system shutdown. Get your multimeters and pressure gauges out before you pull the trigger on a new part.

Pair With

Pair with gas leak detector spray, a reliable multimeter, and your preferred set of manifold gauges for a complete service toolkit on any ducted gas heater job.