1. Adjust gas pressure

• Adjust the gas pressure to bring combustion analysis (CO, flue temperature, O2%, excess air, & steady state efficiency) within the desired range as shown on the Furnace Clean & Tune Form.

• Be sure not to adjust gas pressure below or above the manufacturer specified range.

2. Change orifices

• If you are not able to get combustion results within the desired range by adjusting the gas pressure, change the orifices to the correct size based on the deration calculation or charted orifice size listed in the Good Practices book.

• Replace them with orifices that are pre-drilled to the correct size. PEENING THE ORIFICES IS NOT ACCEPTABLE.

• Repeat gas pressure adjustment for desired combustion analysis result.

3. Remove & clean furnace blower

• Remove the blower from the furnace, remove the motor from the blower, and clean the blower.

4. Clean inside furnace cabinet

• With a vacuum and a damp cloth, clean all the components in the burner compartment.

• If the flames do not light smoothly across the burners, remove the burners and clean the cross-over tubes.

• If the furnace is a 90%+ efficiency, clean the secondary heat exchanger with a vacuum and a brush. Be sure you do not bend the fins. If there are bent fins, use a fin comb to straighten them out.

5. Reassemble the furnace

• Reassemble the furnace back to its original state.

6. Test & adjust

• After completing steps 1-4, turn the furnace on and verify its operation and that the heat rise and static pressure are within the manufacturer specifications.

• If necessary, adjust the blower speed so the heat rise and static pressure are within manufacturer specifications.

• Document any changes made on the HVAC Clean & Tune Form.

7. Combustion analysis

• Once all the previous steps are completed, conduct a final combustion analysis and put a copy in the client file to verify the furnace is operating within optimal range.

8. Place Green Sticker

• Fill out and place the Green Sticker on the door of the furnace.

• Fill out and place the Utah WAP orange filter sticker on the ducting where it is easily noticeable.

9. Leave a spare filter

• Leave at least one additional spare filter with the client.

10. Document

• Complete the HVAC Clean & Tune form.

11. Worst Case Draft test

• Conduct a Worst Case Draft (WCD) test to verify Category I, II, and III appliances are venting safely before leaving home for the day.

• Testing shall be recorded using the Utah WAP Worst Case Draft Test form.

RMGA certified technician

Work done on natural gas burning appliances must be done by a Rocky Mountain Gas Association Certified Technician.

Codes and Specs

Equipment must be in compliance with manufacturer specifications and local codes.