Allied Furnace: Checking gas flow rate (approximate)
Checking gas flow rate (approximate) on a Allied furnace: Clocking the meter. Quick way to check actual gas input. Run furnace 5 min first so it is steady. Only this appliance on the meter. Compare against the Gas Meter Clocking Chart for the unit size and fuel.
Applies to: All sizes
Common causes of checking gas flow rate (approximate)
- Orifices wrong size or partly blocked
- Manifold pressure off
- Other gas appliances left running during the test
- Meter dial misread
How to fix checking gas flow rate (approximate): step by step
- Shut off all other gas appliances on the meter, including pilots.
- Time two revolutions of the meter dial in seconds.
- Divide that time by two to get the time for one revolution.
- Compare the result with the Gas Meter Clocking Chart for the unit size and fuel.
- If manifold pressure is correct and the flow rate is wrong, check the burner orifices for proper size and restriction.
- Remove any temporary gas meter that was installed.
- Relight other appliances after the test and leak-check any joint you disturbed.
If the unit shows an error code, look it up: Allied Furnace codes
Source: Allied 92G1UH installation manual, p. 47. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.