The 800 Series of products were originally designed to provide condenser head pressure control in low ambient environments.

The product line includes models for single phase and three phase induction motors, and now supports EC motor applications.

880-ECM Head Pressure Control for retrofit of energy saving ECM fan motors
814/816 Series Head Pressure Control for induction fan motors
851-MS Multiple Sensor Selector
861-ASQ Condenser Fan Sequencer
865D-2 Three Phase Head Pressure Control for induction fan motors
890-DSQ Universal Sequencer and Modulator