NTI Boiler: Gas line installation requirements
Gas line installation requirements on a NTI boiler: Gas line work must be done by a licensed professional. Confirm the boiler gas type matches the rating plate. This boiler must be converted for propane using the separate Gas Conversion Manual. Gas pipe connection is 3/4 in NPT and the pipe must not be smaller than 3/4 in. Do not use 1/2 in quick flex gas lines. Size the supply for the combined maximum BTU/hr of all appliances on the line.
Applies to: TRX150 gas connection
Common causes of gas line installation requirements
- Undersized or quick flex gas line
- Gas type mismatch with the rating plate
- Sulfur content above the limit
How to fix gas line installation requirements: step by step
- Confirm the gas type on the rating plate matches the supply.
- Install a sediment trap (drip leg) at least 3 in long, accessible and protected from freezing.
- Install a manual gas shut-off valve close to the boiler.
- Install an approved gas union between the shut-off valve and the boiler 3/4 in NPT connection.
- Do not operate on gas with average sulfur above 30 mg/m3.
- Check the gas line inlet pressure and leak-test before firing.
If the unit shows an error code, look it up: NTI Boiler codes
Models
TRX085TRX110CTRX150TRX199TRX199C
Source: NTI TRX150 manual, p. 54-55. 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.