I don't know about Lennox in particular, but I was getting RFI from a Carrier
furnace. It had a variable speed motor. I could see the RFI change as the
motor ramped up to speed. The first thing I did was add a power line filter
inside the unit. This only helped a little. What eliminated the remaining RFI
was running the thermostat cable through some Type 31 ferrite right at the
unit. That cable was about 20 feet long and made a good antenna for the
conducted RFI on it. In summary, suspect filtering may be needed on all wires
connected to the HVAC unit.
73,
Randy KQ6RS
-----Original Message-----
From: RFI <rfi-bounces@contesting.com> On Behalf Of D C _Mac_ Macdonald
Sent: Friday, November 2, 2018 4:05 PM
To: RFI Group <rfi@contesting.com>
Subject: [RFI] RFI from furnace/air conditioning
I have fairly recently gotten back on the air after a few years off. This is
AFTER I had to have our HVAC replaced. It is a Lennox SL280UH090V48B-03 which
is a variable BTU and variable speed fan system. Lots of trash, especially on
20 meter band. Does anyone here have experience with Lennox systems in general
or my specific unit ?
73 de Mac, K2GKK/5
(Since 30 Nov '53)
Oklahoma City, OK
USAF Retired 61-81
FAA Retired 94-10
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