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Allied · Furnace troubleshooting

Installation code requirements

A95/A93/95G1/92G1UH

What is going on

Local code comes first. Without it, the National Fuel Gas Code (ANSI Z223.1/NFPA 54) applies in the USA and CSA-B149 in Canada. These units are CSA certified to ANSI Z21.47 and CSA 2.3. Installation and service must be done by a licensed professional installer, service agency or gas supplier.

Likely causes

  • New installation where the inspector wants code references
  • Replacement furnace where the old code basis has changed
  • Non-direct vent install needing combustion and ventilation air calculations
  • Homeowner or unlicensed person attempting gas work

Check in this order

  1. Confirm the local building code in force, because it overrides the manual where stricter.
  2. If there are no local codes, follow ANSI Z223.1/NFPA 54 (USA) or CSA-B149 (Canada).
  3. Provide combustion and ventilation air per the applicable code for non-direct vent installs, since an undersized space causes poor combustion.
  4. Use a licensed installer or gas supplier for the install and for any later gas service.
  5. Pull permits and arrange inspection where required.
  6. Keep the manual and rating plate information with the furnace for future service.

Applies to: All A95UH, A93UH, 95G1UH and 92G1UH installs

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Source: Allied 92G1UH installation manual, p. 8. 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.