The 901-HR Series Heating Sequencer is a "first on/last off," low voltage, time based step controller. The sequencer is available in nine models (2 through 10 stages) of 24V AC non-isolated output control. The 901-D Logic is required to interface the thermostat input to the sequencer and provide 24V AC power to the sequencer through factory furnished cables. The 901-HR Sequencer may be used as a stand alone with any 901-D or in combination with proportional power switches.
- Available in nine models, 2 through 10 stages
- Four selectable time delay options
- May use stand alone sequencer, or in conjunction with modulation for Vernier applications
- Interconnecting cable included