Thanks for that link. I saw that thread but had not read all of it until after
I saw it again in your post. It was most helpful. At the end of that thread
they talk about the 47D01U-843 board, which is the one I'm considering. It
costs a bit more but won't need a relay or other
; From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of
> Mitch Haley via Mercedes
> Sent: Thursday, January 17, 2019 10:02 AM
> To: Mercedes Discussion List
> Cc: Mitch Haley
> Subject: Re: [MBZ] OT: Heat Pump Demand Defrost?
>
> Sounds like your brand new system
Sounds like your brand new system is too big for the available airflow.
Refrigeration units are more efficient at lower temperature rise.
If you're seeing more than a 20-25° rise from return to supply temp you need
more air.
(like 68° thermostat setting and 88° supply outlet temps)
It might be
I think Rheem = Emerson (don't know) and if I'm right you'd need to modify the
printed circuit or install an external relay to make it work.
The Rheems go for about $60 on Amazon.
With Rheem to Carrier I'm sure you'd have to reverse the power to the reversing
valve.
Almost everybody uses
> -Original Message-
> From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of
> Mitch Haley via Mercedes
> Sent: Wednesday, January 16, 2019 4:53 PM
> To: Mercedes Discussion List
> Cc: Mitch Haley
> Subject: Re: [MBZ] OT: Heat Pump Demand Defrost?
>
> I put a
https://www.diychatroom.com/f17/retrofit-demand-defrost-goodman-clpt42-129571/
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I put a Nordyne board in my Goodman about five years ago, because the timed
defrost drove me nuts. 90% of the time it defrosted when it didn't need it, and
in humid/foggy conditions it turned into a giant sno-cone before the time was
up.
The Rheem boards come with the sensors, my Nordyne
I wonder if any of the august sages here gave experience or objective data on
the value of retrofitting demand defrost on a heat pump that came with
time/temperature defrost.
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