Originally Posted by
udarrell
I Got the furnace specs.
That 125 number is the Input, not the Output on that Lennox Brand of equipment.
Usually a 1/2-HP motor won't quite deliver 1400-CFM; marginal HP even at .50" ESP. CFM if the furnace output is 100,000-Btuh Output.
Listed Temp-rise is 45-65-F. | using Max 65-F temp-rise * 1.1 is 71.5; 100,000-Btuh / 71.5 is 1398.6-CFM or, I'd say, 1400-CFM. However, the duct system will probably be will above .50" ESP lowering the CFM.
With your duct system & filter, It would need the jumper to run on the high speed in heating mode; unless cooling mode could use a lower speed.
Make sure they check the wiring of the capacitor...
Blower data: I believe that model calls for a 3/4-HP motor which would deliver 1405-CFM at .70" ESP; which I'm betting your duct system would have.
Just my tentative view of the situation from here...
what is your concern with the cap wiring? he did not mention brn/white and brn only purple and the motor speed taps and the info provided makes it wired correctly, except for the heat speed.
so you are asking the factory motor be switched based on the static pressure?
I am willing to bet, with the work done and pictured, they do not know how to check that.
not that we/he knows, but why alter the motor size based on ASSUMED data? unless someone can test properly and interpret the data, using the motor specified by mfr would be advised.
also, not sure where your specs come from, but from Lennox it is a 1/2HP motor and rise is 45°-75° as I previously posted.
The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
from an excerpt by Paul Jacob in Sun City, AZ