The MARS 33215 Sequencer is a professional-grade 24V control specifically engineered for the precise staging of electric heating elements and blower motors in residential furnaces and heat pump applications. This multi-stage heat sequencer utilizes a solid-state PTC (Positive Temperature Coefficient) heater to drive a snap-acting disc, ensuring consistent timing and terminal switching regardless of ambient temperature fluctuations. Featuring a combined DPST and SPDT switch configuration, the 33215 manages up to three separate timing delays. The On-delay timing typically ranges from 1 to 60 seconds, while the Off-delay timing operates between 1 and 45 seconds, providing the necessary lead-lag functionality to prevent circuit overloads and ensure proper airflow before heat activation. Designed as a universal replacement sequencer for various OEM brands, it is built to resist shock and vibration, maintaining UL and CSA certifications for long-term reliability in demanding HVAC/R environments. Key Benefits for Technicians Universal Application: Standard 24V control circuit makes this heat pump sequencer compatible with electric heat, furnaces, and commercial refrigeration equipment. Precision Timing: Dependable time delay relay mechanism prevents high-amperage surges by staggering the activation of multiple heating banks. Robust Switching: Features a high FLA rating (25A at 240V) with DPST (Double Pole Single Throw) and SPDT (Single Pole Double Throw) contacts for complex wiring layouts. Durable Design: The non-positional mounting and vibration-resistant internal disc make it a reliable choice for high-airflow air handlers. Safety Standards: Fully UL and CSA listed, ensuring the component meets rigorous safety specifications for residential and commercial heating. Common Questions & Technical Insights What is the switch configuration for the MARS 33215? The unit features one DPST switch and one SPDT switch, providing three total switches across its timing sequence for versatile control of fans and heating coils. Can this sequencer be used in heat pump systems? Yes, the 33215 is specifically designed for heat pump auxiliary heat staging and electric furnace sequencing where timed element activation is required. What are the timing specifications for the 33215? It features a 1-60 second on-timing and a 1-45 second off-timing, which helps maintain system efficiency and prevents rapid cycling of the compressor or heating elements. This item is not eligible for free shipping. 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.
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