Blower Noise (fwd)

[Nan and Sandy Sanders]

Chuck,
   You may want to go to http://hvac-talk.com/vbb/index.php and post your 
questions in the residential HVAC section. Give all details like make model 
serial number etc. There seem to be an engineer or two as regulars. This 
will be a bit out of the norm for them but some one may have seen this 
problem before. A warning they can be a very rough crowd .

                                                         Sandy
                                                         WB5MMB




At 01:35 PM 7/21/02 -0400, prinaldo@mindspring.com wrote:
>Chuck,
>
>Sorry, I don't have the answer. I am forwarding this to ARRL Lab Supervisory
>Ed Hare, as he and his staff handle these types of RFI problems. Also, I am
>circulating it to the AMRAD (tacos) reflector in hopes someone has some advice
>for you.
>
>Paul
>
>-------- Forwarded message --------
>Date: Thu, 18 Jul 2002 18:09:10 -0400
>From: prinaldo@mindspring.com
>Reply-to:
>To: prinaldo@arrl.org
>Subject: Blower Noise
>
>July 18, 2002
>
>Dear Paul,
>
>Most likely you are a very busy person and have little time to spend on other
>
>people's problems. However if you are able to steer me in the right direction
>
>to help me solve mine I will be very grateful.
>About two years ago I had a new HVAC unit installed. The blower motor is a
>variable speed General Electric Model #  HD 44AE120. The problem is that
>whenever the motor starts up it produces a noise on my Yaesu FT 101B on 10
>Meters and 20 Meters.
>When the blower motor is not running the S-Meter may read approximately 2.5 -
>
>3.0 units, with the blower motor running the S-Meter may read 7.0 - 8.5
>units. When switched to a dummy load (cantenna) the noise disappears. Switch
>back to the dipole or yagi the noise appears. I have written to the
>manufacturer (Carrier) several times and they have sent the installation crew
>
>back to 1) change the motor, 2) install Radio Shack Ferrite inductor on the
>AC line feeding the unit 3) install shielded wire to the thermostat 4) ensure
>
>the unit is properly grounded. All four did not alleviate the problem.
>(Carrier Corporation policy prohibits me from talking to their engineers, I
>must write to the Customer Relations Department.) There are 13 electrical
>leads from the control board to the motor. I have installed a ferrite cable
>type inductor on the leads and experienced no relief. The HVAC is a gas unit
>and the vent protrudes through the roof about three feet, and is
>approximately ten feet from my dipole and twenty feet from my yagi.  I
>disconnected the vent pipe at the furnace and the noise lever rose about two
>units on the S-Meter. I don't know how to contact General Electric Motor
>Division, and I doubt they would let me talk to their engineers for fear of
>liability, as my feeling are that the motor is generating RFI. (I think this
>because I can hear the difference in noise level when the motor speed changes.
>
>Any ideas that you can suggest will be extremely helpful.
>
>Chuck,
>         KA4KGH
>
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