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stevehull · 02-21-16, 07:28 PM

Many of those furnaces have a dip switch on the control board that disables the variable gas valve. It then operates in just the off or on mode.

For a +/- approximation, you can look at the plate to find out the BTUs when it runs 100%. A better way is to read the meter, do the test for 12 hours and then read the meter again. Most meters are in ccf with a subdivision to cf. Then you can look up the BTUs per ccf and multiply to get total BTUs and then apply the efficiency number 90-95% or so.

Look in the manual or get one on line.

Steve

02-21-16, 07:28 PM	#12
stevehull Steve Hull Join Date: Dec 2012 Location: hilly, tree covered Arcadia, OK USA Posts: 826 Thanks: 241 Thanked 165 Times in 123 Posts	Many of those furnaces have a dip switch on the control board that disables the variable gas valve. It then operates in just the off or on mode. For a +/- approximation, you can look at the plate to find out the BTUs when it runs 100%. A better way is to read the meter, do the test for 12 hours and then read the meter again. Most meters are in ccf with a subdivision to cf. Then you can look up the BTUs per ccf and multiply to get total BTUs and then apply the efficiency number 90-95% or so. Look in the manual or get one on line. Steve __________________ consulting on geothermal heating/cooling & rational energy use since 1990