I was referring to the "Furnace" fan blower that moves air through the house.
There are a couple different configurations for variable speed blower (fan)
motors. Some are quieter than others. I have a friend who had to have his
furnace manufacturer's factory tech come out and install toroids in his furnace
to quiet it down so that he could DX. He does not have a Carrier Infinity as I
have.... and I have not found any RFI from my furnace (I am a 160, 80, 40, 20,
15, & 10 meter DXer).
YMMV...
73,
Gary ~ AB9M
________________________________
From: Dale Johnson <dj2001x@comcast.net>
Sent: Saturday, May 12, 2018 7:43 AM
To: GARY HUBER
Cc: Howard Lester; jim@audiosystemsgroup.com; rfi@contesting.com
Subject: Re: [RFI] What Does Variable Speed Mean?
I am wondering if there is confusion maybe. I believe my furnace has two
fan/blowers . One is forcing air though the ducts to heat the house and it has
more than one speed. The other is for the combustion chamber, that one I don’t
know if it has more than one speed, maybe it does as Gary mentioned, I think
what he was referring too.
Dale, K9VUJ
On 12, May 2018, at 7:02, GARY HUBER <glhuber@msn.com> wrote:
I understand what " continuously variable" means and the Variable Speed ECM
Blower Motors are not operating in "discrete steps" but are rather programmed
for upper limited RPM speed for "Low, Medium, or High". These motors in fact
drop speed during burner, heat coil or condenser coil operation, so that the
air plenum and duct work are working at maximum efficiency.
Besides owning several Carrier Infinity systems with Variable Speed ECM
Blowers, I worked in HVAC for almost ten years many years ago. Maybe my
understanding of a “variable speed fan" is different than yours or Jim.
73,
Gary ~ AB9M
________________________________
From: Howard Lester <howard220@gmail.com>
Sent: Friday, May 11, 2018 5:50 PM
To: GARY HUBER
Cc: rfi@contesting.com
Subject: Re: [RFI] What Does Variable Speed Mean?
What Jim is describing as a “variable speed fan,” in the context of RFI
production, is one that is continuously variable, not one that has speeds
controlled in discrete steps. See below what I excerpted from his explanation.
Howard N7SO
Is there a variable speed furnace fan that has a high, medium, and low speed
setting?.....
Yes.....
See <https://highperformancehvac.com/ecm-blower-motors-2/>
[https://www.bing.com/th?id=OVP.eUnoqSz-eoNERnwaQ2OO2gEcEs&pid=Api]<https://highperformancehvac.com/ecm-blower-motors-2/>
Variable Speed ECM Blower Motors | Air Handler Air
Flow<https://highperformancehvac.com/ecm-blower-motors-2/>
highperformancehvac.com
Variable Speed ECM Blower Motors these motors increase efficiency of the
systems and offer a whole range of other benefits that help the system
[https://www.bing.com/th?id=OVP.eUnoqSz-eoNERnwaQ2OO2gEcEs&pid=Api]<https://highperformancehvac.com/ecm-blower-motors-2/>
Variable Speed ECM Blower Motors | Air Handler Air
Flow<https://highperformancehvac.com/ecm-blower-motors-2/>
highperformancehvac.com
Variable Speed ECM Blower Motors these motors increase efficiency of the
systems and offer a whole range of other benefits that help the system
73,
Gary ~ AB9M
on behalf of Jim Brown
Think of a
variable speed motor as being more like a volume control, so its speed
can be varied over any value from zero to high.
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