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Posted by lp13-30 on December 21, 2007, 12:09 pm
Actually, the main benefits from a true variable speed are comfort and
noise reduction. Energy saving is just a fringe benefit. What you are
wanting to do is certainly possible. You could retrofit a Model T engine
to electronic fuel injection with enough time and money. I seriously
doubt you are going to find an ECM for any where near $200 though. Fwiw,
we have installed a lot of variable speed furnaces and air handlers
(mostly Trane, Amana and Carrier) and I have not heard of any problems
with electrical noise at all. Good luck with your project if you go
thru with it. Larry
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Posted by Some Guy on December 21, 2007, 6:35 pm
lp13-30 wrote:
> Actually, the main benefits from a true variable speed are
> comfort and noise reduction. Energy saving is just a fringe
> benefit.
Actually, you're wrong.
There are some ECM motors that are single or maybe dual-speed (not
variable speed).
The main benefit DOES come from more efficiency at converting
electricity into motion.
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Posted by Some Guy on December 21, 2007, 6:33 pm
gfretwell@aol.com wrote:
> I put a regular motor in my Trane air handler when the ECM motor
> went bad. They wanted over $1000 for the motor.
Was that $1000 for the motor only, or did it include labor?
How old was the Trane unit? I'm surprised that the motor wasn't
covered by at least a 5 year parts warranty (and more likely 10 year
parts warranty) - given that I don't think that ECM motors have been
around for more than 5 years.
The retail price for some mid and high-efficiency furnaces (with ECM
motors) is usually less then $3500, so I can't see the motor alone
costing $1000.
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Posted by on December 21, 2007, 9:41 pm
>Was that $1000 for the motor only, or did it include labor?
Intalled, 9 year old TWE Trane was jerking me around on the warranty.
I thought I was supposed to have 10yr P/L they said it was 5. It was
hot and I went for the $275 regular motor
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Posted by PV on December 21, 2007, 11:36 am
> Just wondering if anyone has replaced their conventional furnace /
> HVAC fan motor (PSC, single phase, etc) with one of the new ECM motors
> to realize a reduction in your electricity bill.
> Does anyone know what the "over-the-counter" cost is of these motors?
> Also, do ECM motors generate electrical or RF noise that is either
> radiated by the motor or fed back into the household wiring, thereby
> messing up AM radio reception?
http://www.ccht-cctr.gc.ca/ecm_e.html
It's a Canadian study but shows some benefits
PV
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> comfort and noise reduction. Energy saving is just a fringe
> benefit.