Copeland Comfort Control (White Rodgers) 24A34-14 Heat Sequencer

The White Rodgers 24A34-14 is a professional-grade 5-switch electric heat sequencer engineered for staging heating elements and blower motors in residential and light commercial furnaces. As an HVACR technician, you know that managing inrush current is critical to preventing tripped breakers and ensuring system longevity. This 24V heat sequencer features four distinct timings that provide a staggered start-up and shut-down sequence (1-160 seconds), effectively protecting your electrical service from massive simultaneous loads. This unit serves as the direct replacement for F77-5748 and is cross-compatible with various Klixon, TOD, and Honeywell models. The multi-poise mounting design allows for installation in any orientation, while the double quick-connect terminals simplify complex wiring for combination loads. Whether you are troubleshooting an electric furnace sequencer that won't cycle or performing a routine HVAC sequencer replacement, the 24A34-14 provides the reliable, sequenced heating control required for modern 240V systems.

• High Load Capacity: Rated for 25A resistive at 120/240 VAC and 12.5A at 480 VAC, suitable for heavy-duty electric strip heat.
• Universal Compatibility: Functions as a direct cross-reference for Mars, TOD, and Gemline 5-switch configurations.
• Auxiliary Flexibility: Any contacts except F1 and F2 can be utilized as auxiliary contacts for tailored system logic.
• Robust PTC Heater: The solid-state PTC (Positive Temperature Coefficient) heater ensures stable timing across a wide ambient temperature range (-50°F to 165°F).
• Fan Interlock Logic: Specifically designed to meet UL requirements for fan interlock when multiple sequencers are used in parallel.

What is the difference between F1-F2 and M1-M2 terminals on this model?
On the 24A34-14, the primary switch contacts are designated as F1-F2 instead of the standard M1-M2 found on other 24A34 series models. These are the first switches to turn ON and the last to turn OFF, typically used for the blower motor.

Can I use this to replace a sequencer with fewer switches?
Yes, a 5-switch sequencer can replace units with fewer switches by leaving the unused terminals open, provided the timing ranges and voltage ratings match the original equipment specifications.

How do I test the internal heater on this 24A34-14?
With power disconnected, check for continuity across the bottom two heater terminals. An open circuit indicates a failed PTC heater, requiring a complete heat sequencer replacement.

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.