The valve is CSA listed and meets ANSI Z21

The S1-025-31813-000 ensures that if the system experiences restricted airflow—often due to a clogged filter or a failing secondary heat exchanger—the circuit breaks before the unit sustains damage

The Carrier 220110-029 Ionizer Wire is a critical 18

The thermostat will open the electrical circuit when the sensed temperature reaches 105°F (to prevent overheating) and will close (reset) once the temperature cools to 73°F

you will connect the white (common) and red (208V) leads

Danfoss 020-1012 Check Valve The valve is CSA listedThe Danfoss 020 1012 (NRV 12s) is a professional grade, straightway HVAC check valve designed to maintain unidirectional flow in liquid, suction, and hot gas lines. Featuring a 1 2" ODF solder connection, this robust component utilizes a built in damping piston, making it highly effective for discharge lines where compressor pulsations are common. Its brass body and copper connections allow for a maximum working pressure of up to 710 psig (49 bar),