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Posted by Tony Hwang on December 21, 2007, 9:24 pm
Some Guy wrote:
> 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?
Hi,
Don't even bother. It is DC servorized motor with matching control
logic board. High efficiency furnaces are made to take advantage of
this variable speed motor. Also they are not as reliable as ordinary
motor. If you don't understand how closed loop DC servo motor works..
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Posted by Some Guy on December 21, 2007, 11:04 pm
Tony Hwang wrote:
> > 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.
> Don't even bother. It is DC servorized motor with matching control
> logic board. High efficiency furnaces are made to take advantage
> of this variable speed motor.
Everything you're saying is true, but it doesn't mean that
fundamentally ECM motors are more efficient regardless in what type of
furnace they're used in.
Even if all I do is use it as a constant-speed replacement for a 50%
efficient PSC motor, it will use less electricity.
The question is - how much, and what is the over-the-counter cost of a
suitable ECM motor (not the HVAC-contractor-installed price).
> Also they are not as reliable as ordinary motor.
That is probably true, and along the lines of planned obsolescence
that's designed into modern residential HVAC systems.
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Posted by Tony Hwang on December 22, 2007, 11:17 am
Some Guy wrote:
> Tony Hwang wrote:
>
>
>>>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.
>
>
>>Don't even bother. It is DC servorized motor with matching control
>>logic board. High efficiency furnaces are made to take advantage
>>of this variable speed motor.
>
>
> Everything you're saying is true, but it doesn't mean that
> fundamentally ECM motors are more efficient regardless in what type of
> furnace they're used in.
>
> Even if all I do is use it as a constant-speed replacement for a 50%
> efficient PSC motor, it will use less electricity.
>
> The question is - how much, and what is the over-the-counter cost of a
> suitable ECM motor (not the HVAC-contractor-installed price).
>
>
>>Also they are not as reliable as ordinary motor.
>
>
> That is probably true, and along the lines of planned obsolescence
> that's designed into modern residential HVAC systems.
Hi,
This type motor is known for failure mode for motor and controller going
out together. Most people who has this thing in their furnace, they take
out 10 year warranty for that part. If you buy and use it as constant
speed blower at an expense, that is fine for the purpose of experiment
but economy wise I don't think you'll recover initial cost and if it
fails......
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Posted by Some Guy on December 22, 2007, 12:01 pm
Tony Hwang wrote:
> This type motor is known for failure mode for motor and
> controller going out together. Most people who has this
> thing in their furnace, they take out 10 year warranty
> for that part.
That is all probably true.
> If you buy and use it as constant speed blower at an
> expense, that is fine for the purpose of experiment
> but economy wise I don't think you'll recover initial
> cost and if it fails......
In a previous post, I've already roughly calculated that I'd probably
save $40, possibly $60 per year if I changed my PSC motor for an ECM
motor.
The question that I continue to ask is: What is the
"over-the-counter" price of an ECM motor?
I can walk into any hardware or farm supply store and buy a 120v, 1/3
hp PSC motor (for $75 to $150).
Where do go when I want to pick up an ECM motor?
Who sells them "over the counter" ?
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Posted by Tony Hwang on December 22, 2007, 8:25 pm
Some Guy wrote:
> Tony Hwang wrote:
>
>
>>This type motor is known for failure mode for motor and
>>controller going out together. Most people who has this
>>thing in their furnace, they take out 10 year warranty
>>for that part.
>
>
> That is all probably true.
>
>
>>If you buy and use it as constant speed blower at an
>>expense, that is fine for the purpose of experiment
>>but economy wise I don't think you'll recover initial
>>cost and if it fails......
>
>
> In a previous post, I've already roughly calculated that I'd probably
> save $40, possibly $60 per year if I changed my PSC motor for an ECM
> motor.
>
> The question that I continue to ask is: What is the
> "over-the-counter" price of an ECM motor?
>
> I can walk into any hardware or farm supply store and buy a 120v, 1/3
> hp PSC motor (for $75 to $150).
>
> Where do go when I want to pick up an ECM motor?
>
> Who sells them "over the counter" ?
Hi,
Lennox is known for selling parts only to trade people. You can contact
other brand supply house or try on-line search. Another issue maybe
mechanically fitting it into your existing set up. Prepare to pay
over a grand for motor and controller. How much is electricity cost
where you are? I have locked in rate of 7 cents per KWH for next 5 years.
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> 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?