Diversitech SEQHDR101 Heat Sequencer Spst 1 Switch

Product Description

The DIVERSITECH SEQHDR101 is a single-element heat sequencer designed to stage one electric heating circuit in ducted HVAC systems. It uses a single-pole single-throw (SPST) normally open main switch with one timing element. The adjustable delay-on timing runs from 1 to 24 seconds, and the delay-off timing runs from 45 to 75 seconds. These timing characteristics control when the heat element engages and disengages, reducing electrical inrush current and supporting orderly staging during electric heat operation. Licensed HVAC technicians install this control as part of electric furnace or air handler heat section service or replacement.

This sequencer is suited for residential and light-commercial ducted electric heating systems where a single heat stage requires controlled timing. Typical applications include electric furnaces, electric air handlers, and strip heat packages. The SPST configuration and single timing element make it appropriate for systems with one heating circuit that requires staged engagement to protect electrical components and maintain proper system airflow before heat element activation.

Key Features

• SPST normally open main switch for single electric heating circuit control
• 1 timing element with adjustable delay-on range of 1 to 24 seconds
• Fixed delay-off range of 45 to 75 seconds for controlled heat element shutdown
• Reduces electrical inrush current during electric heat stage engagement
• Supports proper heating element staging in ducted electric HVAC systems

Compatibility

Designed as an OEM-style replacement heat sequencer for single-stage electric furnaces and electric air handler heat sections requiring an SPST single-element sequencing control.

Installation Notes

Installation is performed by a licensed HVAC technician. Disconnect and lock out all electrical power to the unit before removing or installing the sequencer. Verify line voltage and low-voltage control wiring are de-energized before handling terminals. Follow applicable NEC requirements for electric heating equipment when making wiring connections.

Technical Specifications

• Switch Type: SPST (Single-Pole Single-Throw), Normally Open
• Timing Elements: 1
• Number of Switches: 1
• Delay On: 1 to 24 seconds (adjustable)
• Delay Off: 45 to 75 seconds

Standard Information

• Brand: DIVERSITECH
• Manufacturer Part Number: SEQHDR101