NTI Boiler: Drain the heating system
Drain the heating system on a NTI boiler: Draining the TRX150 and its heating circuit is done for service or to protect the system from freezing. Confirm the boiler is isolated and cold before you open any drain, because system water can be hot enough to scald. Keep the water away from the display and control panel.
Applies to: TRX150
Common causes of drain the heating system
- Water left in the boiler or low points in a building that will sit cold
- Isolating valves not closed, so the whole system drains
- Air not able to enter, so the lowest points drain slowly
How to fix drain the heating system: step by step
- Make sure the boiler power and gas are off, and let the water cool.
- Close the valves of the heating and hot water circuits.
- Open the system drain valve and collect the water in a container.
- Drain water from the lowest points of the system.
- If the boiler is empty on the water side, drain the rest through the lowest points as needed.
- Check the container for dirt or sludge, which tells you the loop needs cleaning.
If the unit shows an error code, look it up: NTI Boiler codes
Models
TRX085TRX110CTRX150TRX199TRX199C
Source: NTI TRX150 manual, p. 89. 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.