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DIY Enthusiast
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Discussion Starter #1
Hey, guys.

Got an Amana 3-ton variable speed split system installed for the upstairs of the house last week. Fired it up for the first time on Saturday night.

With the fan set to "on", I get a nice slow air movement. But as soon as heat is called for, it's like a wind tunnel hits. The way I expected the variable fan to work is that it would use less blower speed when only a degree or 2 are called for. I expected that this would require some additional wiring to the thermostat. The installer sold me on getting a Nest thermostat. It is wired for "heat pump - heat" and "heat pump - cool". I can get the exact wiring for you if it would help. I don't believe he ran new thermostat wire so he likely only used the leads that the old system's wire made available.

So.. what's the deal? A forum search leads me to the ComfortNet thermostats, but that cant' be the only way to get the variable fan speed to act smarter, can it? I don't need to control the speed directly, I just want it to be smart about when it uses differing speeds. Can I use the dip switches I see mentioned?

Thanks!
 

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Administrator
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Nest stat can't control the fan speed. Good chance the installer didn't set up the blower right. However it will still ramp up fairly fast when ever there is a heat or cooling call.
 

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DIY Enthusiast
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Discussion Starter #3
The wires hooked up are:

Y1, G, O/B, RC, C

Interesting tid-bit from the Nest support pages:
"Note: By default, Nest controls the fan in the same way for each stage of heat based on what is selected during setup. A Nest Certified Professional, however can configure each stage individually using Pro Setup"
 

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Need more then 5 wires to have any fan control.
 
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