this auto reset limit switch ensures the blower fan has sufficiently cooled the heat exchanger before resuming a heating cycle

This is a momentary on switch (OFF/MOM-ON)

meaning it will re-engage the system once pressures return to the 325 PSI threshold

you should see between 250mV and 350mV

The Amana-Goodman HKR-03 is a 3kW electric heat strip engineered for field installation in compatible air handlers and modular blowers

York S1-VLV-011 TXV 30067439-890 this auto reset limit switchThe York S1 VLV 011 is a high capacity 11 ton thermal expansion valve engineered for precise refrigerant metering in large tonnage R 22 HVAC systems. Designed for heavy duty commercial and high yield residential air handlers, this thermostatic expansion valve (TXV) utilizes an externally equalized design to maintain optimal superheat across the evaporator coil. With 7 8" x 1 1 8" ODF solder connections, it provides a secure, leak free transition