Carrier HN67QC005 Sequencer

The Carrier HN67QC005 Sequencer is a critical OEM replacement part designed to manage the staging of electric heating elements and blower motor operation in high-efficiency electric furnaces and heat pump systems. As a direct replacement for the legacy HN67QC005B, this 24V staged heating control prevents simultaneous electrical surges by staggering the activation of resistive loads, protecting the transformer and circuit breakers. This HVAC sequencer features a reliable bimetal timing mechanism that ensures precise sequence of operation, maintaining stable airflow and consistent discharge temperatures during the heating cycle. Its compact 3" x 3" footprint and robust 10A rating make it a versatile choice for service technicians handling Carrier PF1MNA and 50HC series air handlers. By coordinating multi-stage heating calls, it optimizes energy consumption and prevents premature component failure caused by improper cycling.

• Direct OEM Compatibility: Engineered as the exact replacement for the HN67QC005B, ensuring correct mounting and wiring alignment.
• System Protection: Staggers the electric heat load to eliminate high-amperage spikes that can trip breakers or damage branch wiring.
• Blower Coordination: Synchronizes the timing of the indoor fan with the heating elements to avoid "cold blow" at startup.
• Enhanced Durability: Constructed with heavy-duty contacts suitable for demanding residential and light commercial HVAC applications.
• Compact Integration: Facilitates easy installation in tight control cabinets without modifying existing brackets.

Is the HN67QC005 compatible with different voltage systems?
This component is rated for 24V AC control circuits and is specifically designed for Carrier and Bryant air handlers using 208/240V heating elements.

What are the signs of a failing sequencer?
Common symptoms include the blower motor running continuously, certain heat strips failing to energize, or "short cycling" where the system shuts down before reaching the setpoint.

Can I use this to replace a multi-pole sequencer?
While this is a direct replacement for the HN67QC005B, always verify the specific wiring diagram and pole configuration in your unit to ensure it matches the sequence requirements of your heater bank.

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.