Steps in order for furnace commissioning:
- Set gas pressure to manufacture default
- Set input of the unit. Change orifices if needed
- Set gas pressure
- Get the temperature rise in the manufacturer suggested range
- Combustion analysis test
An essential step in commissioning a newly installed gas appliance or even just on routine maintenance for both efficiency and safety includes clocking the meter, running a combustion analysis, checking temperature rise, verifying stack/venting draft, and setting manifold pressures.
A 94% gas furnace installed fresh out of the box could be running at quite a bit less when not set up correctly. You’re not doing your customer any favors when not finishing an install as you could add thousands of dollars in gas usage and repairs that could be avoided over the life of the appliance.