The Gledhill PulsaCoil A Class main control pcb works along side the 2 pin sensors and the overheat sensor. The sensor and overheat sensor tell the PulsaCoil A Class main control board the temperature that is present and available. The main control board then sends the required voltage to the pump. It also knows when to allow power to the elements if the system is below its required temperature. This is a new genuine A Class PCB.
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