Diversitech SEQHDR222 Heat Sequencer 2 Dpst 4 Switches

Product Description

The DIVERSITECH SEQHDR222 is a heat sequencer control designed for ducted electric heat systems that require staged heating operation. It features two independent timing elements, each operating a double-pole single-throw (DPST) normally open contact set, giving the unit four total switching contacts. Delay-on timing ranges from 1 to 40 seconds, and delay-off timing ranges from 50 to 110 seconds. These adjustable timing ranges allow four heating circuits to be staged on and off in sequence, reducing inrush current draw and controlling heat strip operation across multiple stages. Licensed HVAC technicians install this control in electric furnaces and air handlers.

This sequencer is intended for ducted electric heat applications where staged activation of heating elements is required. Common install scenarios include electric furnaces, electric air handlers, and package units with multiple heat strips. The two-stage sequencing design staggers element activation to prevent simultaneous full-load startup across all circuits. It serves residential and light commercial ducted heating systems configured with four-circuit electric heat arrangements.

Key Features

• Two independent timing elements for true two-stage heat sequencing
• Four DPST normally open switch contacts for four heating circuits
• Delay-on range of 1 to 40 seconds for staged element activation
• Delay-off range of 50 to 110 seconds for controlled element shutdown
• Reduces inrush current by staggering heat strip startup across stages

Compatibility

Designed as an OEM-style replacement sequencer for ducted electric heat systems requiring four switched heating circuits with two-stage timing control.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect all electrical power to the unit before removing or installing the sequencer. Verify that the replacement sequencer contact ratings match the load requirements of the heating elements before energizing. Follow all applicable NEC requirements for electric heating equipment service and wiring.

Technical Specifications

• Timing Elements: 2
• Switch Configuration: 2 DPST normally open
• Total Switches: 4
• Delay On: 1 to 40 seconds
• Delay Off: 50 to 110 seconds

Standard Information

• Brand: DIVERSITECH
• Manufacturer Part Number: SEQHDR222