The Gledhill PulsaCoil A Class sensor 2 pin is used at multiple points. 1 besides each element and 1 on each side of the plated heat exchanger. These relay the temperature to the main control board. These have also been designed to work in dry or wet situations and therefor can be used at the plate heat exchanger. No other sensor should be placed in the system as it could cause overheating and a fire.
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