NTI Boiler: Pre-start water chemistry and freeze protection
Pre-start water chemistry and freeze protection on a NTI boiler: Poor water quality or lime scale shortens heat exchanger life. Operating above 135°F speeds up scale build-up. Clean and flush the system before installing the boiler.
Applies to: TRX150 and related TRX models
How to fix pre-start water chemistry and freeze protection: step by step
- Flush the system without the boiler connected to remove sediment.
- Check the return Y strainer and clean it if needed.
- Test water chemistry on both the CH and DHW sides before start-up.
- Use only propylene glycol for IWH loops, GRAS rated. Do not exceed 50% glycol unless the manufacturer specifies otherwise.
- Never use automotive or ethylene glycol antifreeze.
- Do not use petroleum-based cleaning or sealing compounds.
If the unit shows an error code, look it up: NTI Boiler codes
Models
TRX085TRX110CTRX150TRX199TRX199C
More commissioning tips for boiler
Source: NTI TRX150 manual, p. 80-81. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.