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Re: [RFI] What Does Variable Speed Mean?

To: Howard Lester <howard220@gmail.com>, "jim@audiosystemsgroup.com" <jim@audiosystemsgroup.com>
Subject: Re: [RFI] What Does Variable Speed Mean?
From: GARY HUBER <glhuber@msn.com>
Date: Sat, 12 May 2018 12:02:24 +0000
List-post: <mailto:rfi@contesting.com>
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.

Gary ~ AB9M
From: Howard Lester <howard220@gmail.com>
Sent: Friday, May 11, 2018 5:50 PM
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 


See <https://highperformancehvac.com/ecm-blower-motors-2/>

Variable Speed ECM Blower Motors | Air Handler Air 
Variable Speed ECM Blower Motors these motors increase efficiency of the 
systems and offer a whole range of other benefits that help the system


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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