MARS 33265 Sequencer

When you're out on a service call for an electric furnace or heat pump air handler, you need a MARS 33265 Sequencer that provides reliable staged heating. This 240V DPST Normally Open Sequencer is a direct service replacement for many OEM HVAC sequencers, designed to manage the activation of heating elements and blower motors to prevent circuit overloads during the initial startup.

The MARS 33265 utilizes a solid-state PTC (Positive Temperature Coefficient) device that drives a snap-acting disc for precise timing. With a 30-110 second delay-on and a 15-65 second delay-off, it ensures proper staging and heat dissipation. Its non-positional design means you can mount it in any orientation, making it a versatile choice for tight control boards in electric heat applications. This sequencer is voltage and ambient compensated, providing consistent timing across a temperature range of -50°F to 165°F. Rated at 25 Full Load Amps (FLA) at 240V, it is built to handle the rigorous demands of commercial and residential HVAC/R equipment.

• Universal Compatibility: Serves as a reliable replacement for Honeywell, White-Rodgers, and various OEM sequencers.
• Precise Staging Control: Features separate on-delay and off-delay timings to optimize HVAC system efficiency.
• Durable Construction: Shock and vibration resistant internal mechanism ensures long-term positive make/break action.
• Flexible Installation: The non-positional, snap-action disc allows for error-free mounting in any plane.
• Safety Certified: Fully UL and CSA listed for use in electric furnaces, heat pumps, and unit heaters.

Can this sequencer be used in a series?
Yes, multiple MARS 33265 sequencers can be wired in series to control a larger number of heating elements, ensuring each stage is energized sequentially.

What happens if the fan doesn't turn on?
If the blower fails to engage, check the first switch (M1-M2) of the sequencer. In most HVAC wiring diagrams, the first switch must control the fan to ensure it remains on until all elements are de-energized.

How do I test a 33265 sequencer with a multimeter?
With the power off, check for electrical continuity across the heater terminals. During a live test, verify that the contacts close (measuring 0 ohms) after the specified delay once the 24V control circuit is energized.

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.