the red coil signifies the 24VAC voltage rating

Common Questions What are the symptoms of a failing York limit switch

you must use the corresponding White spring (046-00-021-02) to ensure the regulator operates within its design parameters

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Can I use a universal adjustable switch instead

Weil McLain 510-312-152 Control 30067439-890 the red coil signifies theThe Weil McLain 510 312 152 Tankless Heater Low Limit Control is a critical safety and operational component designed for CGT model boilers. As a veteran grade aquastat controller, this unit features a fixed 8 degree differential and includes the necessary immersion well for direct sensing. Its primary function is to maintain minimum boiler water temperature, ensuring the tankless heater can meet domestic hot water demands without dropping below