HVACopediaNapoleon · Gas fireplace troubleshooting
Venturi / air shutter adjustment
What is going on
Set flame colour; may need adjusting for fuel, vent configuration and altitude.
Likely causes
- Air shutter not set for vent length/fuel/altitude
Check in this order
- Loosen the securing screw and rotate the venturi to open or close.
- Closing gives a yellower flame but can cause carboning; opening gives a bluer flame but can lift flames off the ports.
- Wait 15-30 minutes for the final flame colour before judging.
- GD70 factory set for the longest horizontal run (20 ft); shorter runs need adjustment (propane can go as low as 1/4" open). Access by removing the two cover screws on the air housing without damaging the gasket. WARNING: qualified gas installer only.
Applies to: Napoleon gas fireplaces - direct vent, natural vent and vent-free (general service manual); GD70 note from GD70 manual
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Source: Napoleon (Wolf Steel) Service Manual W415-0118, Part 5 Testing & Adjustments, Adjustments: Venturi p.44; GD70 W415-0434 Maintenance section. 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.