[RFI] Air Conditioner / Heat Pump recommendations

[John Pelham]

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 at contesting.com] On Behalf Of Kelly Jones
Sent: Tuesday, February 19, 2019 8:41 PM
To: rfi at 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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