Allied Furnace: Check venting and combustion air on non-direct vent installs

Check venting and combustion air on non-direct vent installs on a Allied furnace: Test for spillage and proper draft after startup when the furnace shares a vent with other gas appliances. Carbon monoxide poisoning risk: do this for each appliance on the venting system.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Non-direct vent furnace installs sharing a vent

Common causes of check venting and combustion air on non-direct vent installs

• Vent undersized or oversized after replacing a Category I furnace
• Blocked, leaking or poorly pitched vent
• Insufficient combustion or makeup air

How to fix check venting and combustion air on non-direct vent installs: step by step

1. Seal any unused openings in the venting system.
2. Inspect vent size, horizontal pitch, blockage, leakage and corrosion.
3. Close building doors and windows and doors to other spaces as far as practical.
4. Close fireplace dampers.
5. Turn on clothes dryers, other non-vented appliances and exhaust fans at full speed. Do not run a summer exhaust fan.
6. Light the appliance and set the thermostat so it runs continuously.
7. After 5 minutes of main burner operation, hold a flame at the draft hood relief opening to check for flue spillage.
8. If spillage occurs, correct the vent or add combustion air, then resize the vent using the National Fuel Gas Code or CSA B149 tables.
9. Return doors, windows, fans and dampers to their normal condition.

If the unit shows an error code, look it up: Allied Furnace codes

Models

92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA95UH