York sequences of operation

2 sequences for York equipment: what the unit does, step by step, with the timings. Pick the equipment type, then the mode.

Furnace (2)

Ignition

• Furnace ignition retry and lockout
  TM9V, M9V

Heating

• Furnace heating cycle
  TM9V, M9V

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.