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SPDT switching contacts support both normally open and normally closed control circuits
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Versatile 24V Control: Ideal for 24VAC control circuits in multi-stage heat pumps and air handling units
Rely on this authentic part to eliminate reverse fluid movement and maximize the technical efficiency of your refrigeration circuit
It is technically identical to part number 3100-20Q18181CL
Aprilaire 4403 Insert 320819-301 SPDT switching contacts support bothThe Aprilaire 4403 Scale Control Insert is a critical humidifier replacement part engineered specifically for the Aprilaire Model 400 series, including the 400A and 400M. This U shaped component serves as the structural frame for the water panel, ensuring it remains properly positioned for optimal evaporation. Designed with a built in float chamber, the 4403 manages water levels effectively to prevent internal leakage and overflow. Its primary
