American Standard freedom 80 1 stage furnace - http://www.hvacmechanic.com/ Forums
Original message
| Troy992
 |  "American Standard freedom 80 1 stage furnace"
, posted Thu 23 Oct 12:38  
American Standard freedom 80 1 stage furnace
The installer says that this furnace fan has 3 speed settings a hi, medium, and low is this possible? and what determines what it should be set at if so.
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Replies:
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| ampulman
| "Re(1):American Standard freedom 80 1 stage fu" , posted Thu 23 Oct 14:54
There may very well be 3 fan speeds, but that doesn't mean that you have access to them.
Your blower most likely has a PSC (non-variable speed) motor. There are taps (in your case, most likely 3) where the contractor can select the speed at which the fan will operate.
The choice of speed is dictated primarily by the heat rise (temperature of the outgoing supply air minus the incoming return air), but may also be reduced to lower static pressure or noise due to a poor duct system or oversized unit.
This is O.K., as long as the heat rise does not exceed specifications. As you slow the blower, the temperature will rise.
AM
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| | Troy992
| "Re(2):American Standard freedom 80 1 stage fu" , posted Fri 24 Oct 12:09
the vent flue is on the opposite side as the carrier was so now I have a 14 foot long "hamster cage" looking vent flue that makes about 3, 90% turns to get to the old roof vent. (not sure if this is good) maybe I'll post pics if i figure out how.
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| | Troy992
| "Re(2):American Standard freedom 80 1 stage fu" , posted Fri 24 Oct 12:05
I ask this because my house is 1500sqft with faulted celings and the 80,000 btu carrier was way too hot too fast in heat mode, so I had 1 of the 4 burners plugged leaving only 3 burning, that worked great. This new american standard is also 80,000 btu and the pressure of this blower (more than old blower) had every vent register in my house rattling and sounding like they were about to come out. The installer came out and moved the black wire (hi speed) to the park position and placed the red (med speed) to the place the black was? and that made the registers quit rattling and seems to have made it "not so hot, so fast" kinda a cooler heat? but how does this work less amps to motor?
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