OK I got it. The new furnace came set up for side discharge. I did not buy the down plenum kit so I covered the side discharges and made my own down discharge.
The New furnace was a NT 30 "SP", the old was a NT-30 "M"
Only apparent differance was the location of the gas line and wiring connections and the fire box seems lighter.
Once I had evrything covered and the down discharge set up the new box fit perfect Where the old one was. I installed the new thermostat that came with the furnace. Does anyone know what the "actuator setting" is supposed to be at. Neither the furnace manual or the thermostat instructions gave me a number. I have test run the furnace and it seems to cycle ok.
The actuator setting is a "sensitivity" setting a think. It has to do with how long the blower or furnace will run once the thermostat trips.
If its not set correctly the furnace will "short cycle" or turn off before reaching the set temp and then have to turn back on again. The result is the furnace ends up kicking on and off more frequently.
This is to say, that is my understanding of it's purpose. I will start at .25 and go from there.
I am taking her out next month to the mountains of northern NM (Red River), for a working vacation. Teaching a class one day, skiing with the family the next.
You may be looking at the 'heat anticipation' setting. Usually you set it at the amperage of the primary control element.
For example, if the gas control valve has a .25 amp control relay, then you would set it at .25. On the other hand, if the control element was a large hot water valve with a big actuator you may need to set it higher.
Let it run at least 24 hours between adjustments, you will find the best setting by trial and error.
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