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HVAC - Heat Sequencer
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HVAC - Heat Sequencer

Heat Sequencer Overview

Introduction to Heat Sequencers

  • Robert Curry introduces the heat sequencer, a crucial component in air handler applications that controls the indoor blower motor and electric heat strips.
  • The device is described as simple yet powerful, emphasizing its reliability in operation.

Functionality of Heat Sequencers

  • The heat sequencer features multiple terminals for connections; wires can be connected to operate both relays effectively.
  • Power is applied from a disconnect box to the relay, which remains inactive until low voltage power activates it, moving a plunger that turns on either electric heat or the motor.

Common Issues and Troubleshooting

  • A typical failure mode involves the sequencer not applying power; checking for 24 volts at the terminals is recommended as an initial troubleshooting step.
  • The sequencing process includes staging events where electric heat activates before the blower, preventing cold air from being blown through ducts initially.

Configuration Variations

  • Heat sequencers come in various configurations (single or double stack), but they all function similarly regardless of their design.
Video description

HVAC Basics - Heat Sequencer See more HVAC videos @ http://www.cteskills.com An HVAC sequencer is a small circuit designed to help stabilize circuits and turn switches on and off quickly in an electrical setting. In this particular video we will be covering a heat sequencer. This device will typically run our fan or indoor blower motor on air handler applications. It can also turn on and off our electric heat strips. It is a very simple device but very powerful in what it does. Watch this CTE video on the Heat Sequencer and learn the structure of how it is made and it's basic operation. You'll also learn some of the typical failures you'll find with this device.