I have two Trane 13i, and cannot recommend them. Lots of spikes and have not
had the time to fix it. I added many cores in the outside unit, but did not
help much. I also find it very hard to have technician understand the problem
and willing to help.
Till I have it fixed (if I get it fixed), I turn the heatpump into auxiliary
mode on weekends, where the outside unit is not used. That allows me to have a
clean spectrum during contests… Off course, that cost me a couple of bucks per
day more in energy costs.
If I would buy a unit again, I would find a unit somewhere and check it out
with an AM radio.
Thanks
Andy
KU7T
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
________________________________
From: RFI <rfi-bounces@contesting.com> on behalf of Raymond Benny
<rayn6vr@gmail.com>
Sent: Wednesday, February 20, 2019 5:07:05 PM
To: rfi@contesting.com
Subject: Re: [RFI] Air Conditioner / Heat Pump recommendations
Kelly,
I had a Trane 20i installed abt 8 - 9 years and no RFI.
It is a two speed motor with heat exchanger and has worked very well for me.
Ray,
N6VR/W7YA
On Wed, Feb 20, 2019, 1:27 PM <r55stan@gmail.com> wrote:
> I have a 2004 Carrier furnace with a variable speed motor. When I resumed
> ham radio in 2015, I found it did produce RFI. I could watch the spectrum
> change as the motor ramped up in speed. I installed a Corcom filer on the
> AC line as it enters the furnace and another one at the motor. However,
> that was only partially successful. I put #31 cores on the line to the
> thermostat and the line to the A/C compressor (that energizes the 24 VAC
> contactor). That eliminated the remaining RFI. In my case, just clamping
> one core on those lines was enough. I know that multiple turns through the
> cores increases the impedance with the turns squared and I was ready to
> splice the wires if I needed to do that. But, I did not. The lesson
> learned for me on that appliance was that every wire exiting an appliance
> is
> a potential RFI radiator, not just the power chord.
>
> A lesson learned on previous RFI and isolation problems in my engineering
> days is if you try something and it does not help, don't assume it is not
> contributing to the problem (and cross it off your list). It could be the
> strongest leakage path is masking the weaker ones, and you could end up
> taking a long time to go back to something you ruled out before. A better
> approach to save on unnecessary filters is to solve the problem and then go
> back and experiment with which filters (e.g. ferrite cores) you can
> remove.
>
> Good luck with your RFI efforts,
>
> Randy KQ6RS
>
> -----Original Message-----
> From: RFI <rfi-bounces@contesting.com> On Behalf Of John Pelham
> Sent: Wednesday, February 20, 2019 10:17 AM
> To: 'Kelly Jones' <kjones@virtualcohesion.com>; rfi@contesting.com
> Subject: Re: [RFI] Air Conditioner / Heat Pump recommendations
>
> Back in 2010, I replaced a heat pump with a new Trane. I specifically asked
> the contractor for a unit with a single-speed motor. What I got was a unit
> with a "single-speed motor," but it was an ECM (electronically commutated
> motor). It generated lots of RFI. I think Trane offered an RFI-kit, but I
> chose to fix it myself with some #31 ferrite cores. I was mostly
> successful,
> although interference could still be weakly heard on some HF bands.
>
> You can get lots of info on Trane products by searching. I Googled "trane
> 4WCZ6036B1000A" and got specs and wiring diagrams, which I only skimmed.
> You
> might want to dig into more detail. I did see the sentence "This enhanced
> mode selection provides a ramping up and ramping down of the indoor blower
> speed to provide improved comfort, quietness and potential energy savings."
> The accompanying graph shows ramping between 2 stages. I think it is likely
> that your recommended unit contains an ECM motor, and yours appears to be
> operated as a variable speed motor - how else to get the ramping between
> speeds? And even if there wasn't ramping, in my experience an ECM motor
> operated at a constant speed is just as noisy as one in a variable speed
> system.
>
> 73, John W1JA
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Kelly Jones
> Sent: Tuesday, February 19, 2019 8:41 PM
> To: rfi@contesting.com
> Subject: [RFI] Air Conditioner / Heat Pump recommendations
>
> Hi all,
>
> I'm needing to replace an old Carrier air conditioner/heat pump and would
> like to ask the general experience of the group. Have you replaced a unit
> recently? If so, what make/model did you use? Did you have any issues
> with
> hash/birdies/noise after replacement?
>
> I'm being recommended an American Standard (Trane) 3 Ton, 16 SEER package
> heat pump. The model is 4WCZ6036B1000A. It is not a variable speed drive,
> but it is 2 stage. I'm hoping to not make a multi-thousand dollar mistake
> by installing a noise generator.
>
> 73
> Kelly - N0VD
>
>
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