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SESK: Stuff Everyone Should Know · sesk.info/epa-no-halide-torch

Which leak detector must never be used on a system with a mildly flammable A2L refrigerant?

A halide torch, or any detector with a naked flame.

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  1. An electronic detector
  2. A halide torch ✔
  3. Bubble solution

Why: Lennox says no potential sources of ignition may be used to search for refrigerant leaks. A halide torch or any other detector using a naked flame shall not be used. Bubble solutions and suitable electronic detectors are acceptable.

Huh, didn't know that: If a leak is suspected, all naked flames must be removed or extinguished.

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Did you hear about the HVAC technicians who got into an argument? At first, it was heated, but they got some fresh air then things cooled off.
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References

Answer: A halide torch. Lennox says no potential sources of ignition may be used to search for refrigerant leaks. A halide torch or any other detector using a naked flame shall not be used. Bubble solutions and suitable electronic detectors are acceptable.

  1. Lennox installation instructions 508844-01 (R-454B split system) www.lennox.com/dA/eb5bdb59f2/508844-01b.pdf
    A halide torch (or any other detector using a naked flame) shall not be used.
    Checked 2026-10-10.

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