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NTI · Boiler troubleshooting

Operate the primary pressure relief valve (test)

TRX

What is going on

Test the relief valve to make sure it seats and does not weep. Check the discharge line is piped to a safe place first.

Check in this order

  1. Make sure the relief valve outlet is piped to a safe drain, away from scalding hazards.
  2. Shut off power to the boiler and wait for it to cool.
  3. Lift the relief valve lever. If water flows freely, release the lever and let the valve seat.
  4. Watch the discharge pipe to confirm the valve does not weep after draining. If it weeps, lift the lever again to clean the seat. If it still weeps, call a qualified service technician.
  5. If no water flows when the lever is fully lifted, the valve or discharge line may be blocked. Shut the boiler down and call a qualified service technician.
  6. If the valve seats properly, restore power and observe the boiler for five minutes.

Applies to: TRX150

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Source: NTI TRX150 manual, p. 88. Written in our own words; check the manual for your exact model.

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.