Carrier HN67QG005 Sequencer

The Carrier HN67QG005 Sequencer is a heavy-duty electric heat relay designed for precise staging of heating elements in residential and light commercial air handlers. This dual-circuit HVAC sequencer utilizes a bimetal heater to provide timed contact closure, preventing large amperage spikes during startup and ensuring stable airflow temperature. Engineered for compatibility with Carrier heating systems, this component is a drop-in replacement for worn sequencer switches that cause sticking contacts or failure to stage. With a 24V coil input, it manages high-voltage resistive loads efficiently, maintaining the integrity of the heat strip assembly. Professional technicians rely on the HN67QG005 for its consistent timing cycles and robust thermal resistance. When diagnosing electric furnace staging issues, installing this OEM-spec control ensures the system operates within original design parameters, protecting downstream components and optimizing energy delivery across the heating cycle.

Key Technical Benefits

• Dual-timing sequences provide staggered activation of heating elements to prevent circuit overload.
• Universal 24V control voltage ensures seamless integration with standard HVAC transformers and thermostats.
• High-amperage contact rating handles the heavy resistive loads common in 5kW to 20kW heat kits.
• Durable bimetal construction offers reliable switching cycles even in high-static environments.
• Direct OEM fit reduces installation time and eliminates the need for field modifications or bracket adjustments.

Common Installation Questions

What are the timing specifications for the HN67QG005?
This sequencer typically features a 1-110 second "on" delay and a 1-110 second "off" delay, allowing heat strips to ramp up and cool down gradually to protect the heat exchanger.

Can this sequencer replace a single-circuit model?
While it can be wired for single-circuit use, it is specifically designed for multi-stage systems. Always verify the wiring diagram to ensure proper terminal alignment for M1-M2 and M3-M4 circuits.

Why is my electric furnace blowing cold air before the heat kicks in?
If the sequencer bimetal heater fails, the contacts won't close to energize the elements. Replacing the HN67QG005 usually restores the necessary timing delay between the blower and the heat strips.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.