Thermopiles are used in millivolt circuits to power the entire control system

you should use the VG7000-1008 or appropriate lower-tension kit

Key Benefits Precise Superheat Control: Externally adjustable design allows technicians to fine-tune evaporator superheat for maximum cooling efficiency

Direct-Fit OEM Compatibility: Eliminates the need for manifold modifications or bracket adjustments in Lennox units

For optimal longevity and to prevent sediment buildup

Johnson Controls P66BAB-5 Control Refrigerant Thermopiles are used in millivoltThe Johnson Controls P66BAB 5 is a professional grade electronic fan speed control designed for maintaining stable head pressure in air cooled condensers during low ambient conditions. Built with a dual input sensor model, this controller modulates the fan motor speed based on direct refrigerant pressure, specifically optimized for an operating pressure range of 190 250 psig. This unit features a 60 inch capillary with a 1 4 inch SAE brass flare nut,