Doc,
Years ago, I had a lot of bad experiences with variable speed motor
drives, but those were in industrial applications. I know that technology
has improved EMC performance in many ways, and any that are rated for
residential applications might (not certain!) have some greater degree of
noise reduction than industrial systems. I can tell you that last year,
the church I attend had eight (8) systems similar to yours installed to
provide air conditioning and extra heat to our 105 year old building in
eastern Iowa. I am the sound system engineer for the church (as well as
one of the Trustees who had to decide on whether to buy the systems) and
had a lot of worries about hash getting into the audio system. No problem
to date, even though the power feeds to some of the heat pump systems are
in the same power panel as feeds power to the audio system.
Yes, I know that an audio system is not a radio system, but it does have a
lot of wiring (a.k.a. "antennas) running around with low level signals. I
have been impressed with the fact that since each of the 8 systems
operates independantly of the others, on-off switching and varying of
blower speeds is random and could be happening many times per hour. Our
units are not the same brand as yours, but they are from a South Korean
manufacturer. They otherwise seem very similar to what you are
considering. We've been happy with the rebate we got from the power
company and the first winter's savings in cost of heating an old building
here in the Midwest.
73, Dale
WA9ENA
kd4e <doc@kd4e.com>
Sent by: rfi-bounces@contesting.com
02/17/2010 11:01 AM
Please respond to
doc@kd4e.com
To
rfi@contesting.com
cc
Subject
[RFI] RFI from Inverter Technology in Split AC Systems?
We are looking at the Sanyo Flexi-Multi Series CMH3172
30,600 BTU Multi-System Heat Pump Ductless Split Outdoor
Unit with DC Inverter, Microprocessor Control and Auto Fan
Speeds.
http://www.ajmadison.com/cgi-bin/ajmadison/CMH3172.html
It seems efficient, will handle our somewhat unique layout,
and is low-profile.
I am concerned about the "inverter technology" as I worry
it may generate a *lot* of RFI. Is that a reasonable
concern?
WDYT?
--
.Thanks! & 73, doc, KD4E
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