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
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|