Noritz sequences of operation

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

Tankless water heater (5)

Domestic hot water

• On-demand heating cycle
  EZ, NRCR, CDV (premix)
• Water route: main and bypass servo by set temperature
  Residential (NRC/NRCP and EZ)

Pump/purge

• Auto Learning recirculation
  NRCR Pro
• Other recirculation modes
  NRCR Pro

Freeze protection

• Freeze prevention heaters and pump
  EZ, NRCR

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.