Solid State Relays are designed for controlling, silently and proportionally, a large amount of power in response to a pulsed signal (suitable for DDC, Direct Digital Control). They incorporate a dual SCR (Silicon Controlled Rectifier) to provide full-wave capability and Zero Crossing Drive Circuitry. The opto-coupler provides the interface to the logic level input signal and electrical input-to-output isolation. Note: SSRs are position sensitive (i.e. the fins of the heatsink must be in a vertical position to ensure proper cooling). It is therefore important to specify in which position the heater is to be installed.
Pilot lights are mounted on the control box to indicate that either a function of the heater is operating or a failure condition is present. The most commonly specified pilot lights functions are: power on, heating on, no airflow, overheating, stages on. The pilot lights' functio...Learn More
Safety feature, monitors the quantity of air flowing through the heater, adjusts the heater’s capacity to match the air flow available and shuts the heater down in case of a total loss of air. This feature is available only on heaters equipped with full SCR.Learn More
The D21-PS electronic controller has been designed to take full advantage of our patented Air-Flow Sensor which modulates the heater’s capacity according to the quantity of air flowing through the heater by responding to the radiant heat of the elements even at very low CFMs. Wit...Learn More
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