Think of a variable speed fan controller as an automatically controlled,
dirty 500 watt square wave generator, connected to a long non twisted
wire, running a motor... They are quite noisy...
I have a neighbor that has one, (probably 70 feet from my antenna), and
he used to run it 7 minutes on, 7 minutes off to clean his home air. I
asked him if he could change that to as needed, and I now have 17, 15,
12, and 10 back, when it is not running, which is most of the time...
He has two Carrier units, and they make zero noise.
His Mitsubishi unit is the culprit in the RFI generation. The model
number is:
SUZ-KA12NA
The installer has no idea of what RFI is...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 11/11/24 08:40, Dan K2YWE wrote:
Thanks Jack.
Do your units have variable speed or multi-speed fan control?
73, Dan
On Mon, Nov 11, 2024 at 11:10 AM Jack Ference <jackference@gmail.com> wrote:
Hi Dan,
Both Frank W3LPL I have had good luck with Carrier. He replaced one unit
as nd replaced two a few years apart.
I bonded the cabinet door to the sides, installed a powerline choke on the
power to the blower motor and installed a coil of wire choke around the
thermostat wires.
I opted for one step down from the highest efficiency units so the
compressor had switched settings rather than variable settings controlled
by electronic circuitry.
Carrier was aware of my concerns and supplied the documentation for the
fixes. They happened to be the same fixes I did on my first unit replaced.
Jack W3KX
Sent from my iPhone
On Nov 11, 2024, at 10:56 AM, Dan K2YWE <dan.k2ywe@gmail.com> wrote:
I'm need to replace my 25 year old HVAC with a new oil furnace and AC
system.
EMIis a great concern. It's a small house and efficiency is of little
importance.
What are the recommended brands and/or models?
73, Dan
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