Braemar THM 530 & X Gas Ducted Heater Air Pressure Switch

This Braemar THM 530 & X gas ducted heater air pressure switch is a direct replacement part (PN. 640709) crucial for maintaining safe and efficient operation of your ducted heating system. It’s what tells the heater that the fan is running and air is flowing, preventing burner lockout or worse.

In the peak of an Aussie winter, a faulty pressure switch can shut down a whole system, leaving homeowners cold. Getting the right genuine spare minimises callback headaches for techs.

Best For

• HVAC technicians and gas fitters
• Licensed professionals undertaking repairs or servicing on Braemar THM 530 and THM X gas ducted heaters

Compatibility

This air pressure switch (PN. 640709, pink label) is specifically designed for Braemar THM 530 and THM X series gas ducted heaters. It's factory-set to activate at 170Pa.

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

Features

• Genuine Braemar part (PN. 640709) for reliable performance.
• Direct replacement for Braemar THM 530 and THM X series gas ducted heaters.
• Fixed set point of 170Pa for accurate airflow detection.
• Identifiable pink label for quick verification on the job.
• Ensures proper airflow detection for burner ignition and safety lockout.

Technical Specifications

What's in the Box

• 1 x Braemar THM 530 & X Gas Ducted Heater Air Pressure Switch (PN. 640709, SY640709)

Using It on the Job

1. Always isolate power to the ducted heater at the main switchboard and perform lockout/tagout procedures before starting any work.
2. Clearly identify the existing pressure switch by its part number and label colour to ensure it matches this replacement (PN. 640709, pink label).
3. Disconnect the old switch, carefully noting hose connections and wiring terminals.
4. Install the new genuine Braemar switch, reconnecting hoses and electrical terminals securely. Double-check all connections.
5. Restore power and perform a full system diagnostic cycle to confirm correct operation of the fan and burner ignition.

Limitations & Safety Notes

• Installation of gas, water, and electrical parts must be performed by a qualified, licensed professional.
• Ensure the part matches your specific Braemar heater model (THM 530 or THM X) to prevent compatibility issues.
• This item is non-refundable once opened from its tamper-evident packaging.
• Always refer to the manufacturer's service manual for specific installation and testing procedures for Braemar THM 530 and THM X models.
• Follow all Australian standards and Safe Work guidance during installation.

Before you even order this, do a quick visual check on the original switch. Sometimes it's just a blocked pressure hose or a dirty fan causing the lockout, not the switch itself. Clean up those hoses and check for obstructions first. It can save a lot of hassle.

Pair With

Pair with other Braemar spare parts or a quality multimeter for fault finding and diagnostics on ducted heating systems.