White-Rodgers 24A34-15 Heat Sequencer

The White-Rodgers 24A34-15 Heat Sequencer is a professional-grade SPDT (Single-Pole, Double-Throw) control designed specifically for heat pump air handler applications. Engineered for precision, this electric heat sequencer manages the staging of heating elements and blower operation to prevent electrical surges and optimize thermal comfort. With a technical on-timing range of 1-60 seconds and an off-timing range of 75-95 seconds, it provides the necessary delay-off for the blower motor in cooling mode and ensures smooth element transitions during heating cycles. This unit features equivalent terminal markings to industry-standard types, making it a reliable direct replacement heat sequencer for many original equipment configurations. Capable of handling 25A resistive loads at 120V or 240V, it utilizes a bimetal disc and PTC heater for ambient-compensated, stable performance across a wide operating temperature range from -50°F to 165°F.

• Universal Compatibility: Features standard terminal markings as a drop-in replacement for most fan and heat sequencing functions.
• Staged Element Control: Prevents massive inrush current by sequencing the activation and deactivation of heating banks.
• Blower Optimization: Integrated delay-off functionality improves efficiency by extracting residual heat from the coils.
• Rugged Construction: Rated for high-current resistive and motor loads in extreme attic or utility room environments.

Can this sequencer be used in a multi-element furnace?
Yes, the 24A34 series can be wired in series with additional sequencers to manage systems with up to seven heating elements.

What is the voltage requirement for the heater circuit?
The internal solid-state PTC heater is designed for a 24V AC control signal, though the contacts can switch 120V, 240V, or 480V loads.

Does this part control the fan independently?
The M1-M2 terminals are typically used to interlock the blower motor, ensuring the fan moves air as soon as the first heating stage prepares to fire.

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.