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Small rectangular sequencer box with three switch terminals and wiring connections

SUPCO

SUPCO Q105 Sequencer 3 Switches 1-110 Sec

SKU CH-Y4AJ-39HNH

Electric sequencer with three switches controlling strip heat or blower fans in furnaces and heat pumps using 1–110 second timing and 14 A at 120 V AC

  • TypeStrip Heat And/Or Blower Fan In Heat Pumps And Ele
  • 3-switch sequencer stages strip heat and blower fan
  • Adjustable 1-110 second timing suits electric, gas, oil and heat-pump furnaces
  • 14 A at 120 V AC handles full-load heating circuits
  • 72 A locked-rotor rating at 120 V AC starts heavy blower motors
  • 7 A at 240 V AC supports higher-voltage furnace installations

SUPCO Q105 Electric Sequencer

The SUPCO Q105 is an electric sequencer designed for controlling strip heat and blower fans in electric, gas, oil furnaces and heat pumps. It provides timed switching for HVAC heating elements and fan motors. The unit is supplied new and ready for installation.

Compatibility checks before ordering

Verify that the control circuit voltage matches your system requirements. The sequencer handles a full load current of 14 A at 120 V AC and 7 A at 240 V AC. Locked rotor ratings are 72 A at 120 V AC and 42 A at 240 V AC. Ensure your application stays within these electrical limits.

Replacing older sequencers

This model replaces sequencers that lack adjustable timing or have fewer switch stages. The three switches offer on and off delays adjustable from 1 sec to 110 sec for both main and auxiliary circuits. The upgrade is worth it when precise staging of heating elements and blower operation is required for system efficiency.

Highlights

  • 3-switch sequencer stages strip heat and blower fan
  • Adjustable 1-110 second timing suits electric, gas, oil and heat-pump furnaces
  • 14 A at 120 V AC handles full-load heating circuits
  • 72 A locked-rotor rating at 120 V AC starts heavy blower motors
  • 7 A at 240 V AC supports higher-voltage furnace installations

Specifications

BrandSUPCO
TypeStrip Heat And/Or Blower Fan In Heat Pumps And Ele

Questions about this item

Does the SUPCO Q105 sequencer come with mounting hardware or wiring connectors, or must those be purchased separately?

The box contains the sequencer unit only. Mounting screws, wire terminals and any required conduit fittings are not included and must be sourced separately.

Should I select this model for a 120 V furnace drawing 14 A or a 240 V unit drawing 7 A?

This single model covers both voltages: it is rated 14 A full load at 120 V AC and 7 A full load at 240 V AC, so no alternative version is needed.

What does the 1-110 second timing range mean when the sequencer is controlling a blower motor in a heat pump?

The main and auxiliary switches can each be set to turn on and off anywhere between 1 second and 110 seconds, giving staged start-up and shut-down for the blower and strip heat.

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