When the internal plenum temperature reaches the 170°F cut-out point

How do I adjust the minimum firing rate

By replacing a failing or restricted valve with this OEM Thermal Expansion Valve

all precisely controlled by its microprocessor

Is the 98G89 a direct replacement for the 98G8901

MARS 16091 Potential Relay 323613-751 When the internal plenum temperatureThe MARS 16091 Potential Relay is a heavy duty, voltage sensing motor starting relay engineered for 1 3 HP single phase compressor applications. Built as a direct OEM replacement relay for Bristol and Copeland systems, this component is critical for managing the transition between start and run cycles. It utilizes back electromotive force (BEMF) to precisely disconnect the start capacitor once the motor achieves approximately 75 80% of its rated