Diversitech SEQHDR202 Heat Sequencer Dpst 2 Switches

Product Description

The DIVERSITECH SEQHDR202 is a heat sequencer designed for ducted electric heating systems that require timed staging of multiple heating circuits. It uses a single bimetal timing element to operate two normally open DPST contacts, controlling when each heating stage energizes and de-energizes. Delay on timing ranges from 30 to 70 seconds, and delay off timing ranges from 1 to 40 seconds. This staged switching reduces electrical inrush current at startup and supports proper load sequencing across the electric heat array. Licensed HVAC technicians working on electric furnaces and air handlers typically install this component.

This sequencer is suited for residential and light commercial ducted electric heating systems where two main heating circuits must be staged rather than energized simultaneously. Simultaneous energization of multiple high-draw heating elements can cause nuisance tripping of overcurrent protection and accelerated contactor wear. The SEQHDR202 addresses both concerns through its timed DPST switching sequence. It is appropriate for electric furnaces and electric heat strips in forced-air air handler units where controlled staging is required by design or by code.

Key Features

• Single bimetal timing element controls two DPST normally open switch contacts
• Delay on range of 30 to 70 seconds staggers heating element engagement at startup
• Delay off range of 1 to 40 seconds controls staged de-energization on shutdown
• DPST contact configuration switches both legs of each heating circuit
• Reduces electrical inrush current by preventing simultaneous multi-element startup

Compatibility

Designed as an OEM-style replacement heat sequencer for ducted electric furnaces and electric heat strip assemblies requiring a single-element DPST two-switch staging control.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the electric heating system before removing or installing this component, as heating circuits typically operate at 240 volts and carry significant amperage. Verify that the sequencer mounting orientation and terminal connections match the original equipment configuration before restoring power. Local electrical codes and NEC requirements for electric heating equipment should be followed throughout the service procedure.

Technical Specifications

• Contact Configuration: DPST, normally open
• Number of Timing Elements: 1
• Number of Switches: 2
• Delay On: 30 to 70 seconds
• Delay Off: 1 to 40 seconds

Standard Information

• Brand: DIVERSITECH
• Manufacturer Part Number: SEQHDR202