HVACopediaNTI · Boiler · Startup
Power-on and mode sequence
What happens, in order
- Press the ON/OFF button to power on the boiler.
- Boiler enters standby.
- On a CH request the display shows the supply temperature.
- On a DHW request the display shows the DHW setpoint.
- A purging cycle runs before ignition.
- After CH or DHW operation, the circuit post circulation runs.
Applies to: TRX150
Models
TRX150
More NTI boiler sequences
- Combustion checking procedure · Startup
- Power-up and what lets the boiler start a call · Startup
- Failed ignition and lockout · Ignition
- First ignition start-up · Ignition
- Light-off sequence and retries · Ignition
- Central heat call (CH1) from call to satisfied · Heating
- Indirect tank (DHW) call · Domestic hot water
- Circulator outputs and their fuses · Pump/purge
Related
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Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: NTI TRX150 manual, p. 63. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
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.