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Dowtherm Heater: Lumber Treatment Plant

We did this project a few years ago. We used a single enclosure with two identical dowtherm heater systems. The original system used TRIAC control for the fuel valves. Recently the end user wanted to change the old TRIAC valves with new valves controlled by a 4-20mA signal. We designed an insert plate to go into the existing fully wired panel so they can install the new side panel and plug the new ControlLogix cards into the chassis.