50A52-102 vs 50A55-486 furnace and AC control module


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Old 05-27-17, 02:54 PM
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Unhappy 50A52-102 vs 50A55-486 furnace and AC control module

I bought a replacement for White-Rodgers Emerson Electric 50A52-102, which says "D340783P01 replace with CNT 1845."
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I received a kit containing White-Rodgers 50A55-486 and some extra wire harnesses and very little for instructions.
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The big 12-wire harness plug is a direct fit between one and the other, but the signal labels are nothing alike. In fact, on the old unit TH and TR are not in the connector, they are beside it. So is the new unit going to do everything that needs to be done, it doesn't appear I can connect it with all the same sensors and actuators? How do the signals map from the 50A52-102 to the 50A55-486?
An older thread in this forum suggests there is a solution but the solution was not posted.
 

Last edited by student4life; 05-27-17 at 02:57 PM. Reason: photos rotated
  #2  
Old 05-28-17, 04:14 PM
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Welcome to the forums.

It looks like the board you received may have not been the right one. If it is the right board then you need to purchase adapters and a flame sense rod separately.
Apparently you need a conversion kit and board.

The Trane KIT0966 kits convert from "radiant sense" to "flame sense".

http://www.doityourself.com/forum/ai...-cnt03797.html

I found several places selling the 50A52-102 upgrade kit.

acparts distributorst_info&products_id=6764
amazon/Generic-50A52-102/dp/B003U4DISY
 
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Old 06-03-17, 01:55 PM
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It works now.
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I ordered that. I received a kit containing 50a55-486 and some step by step instructions that only refer to retrofitting several other kinds of controllers, which may be generalized as 50A50-xxx and 50A55-XXX. The seller eventually pointed out that a foot-note to procedure line 3 of a four-page fine-print procedure does in fact refer to 50A52-102.
Installing this kit is not as simple as just moving wires over from the old controller to the new controller. I was worried about needing wire nuts and cutting and splicing wires, or having to drill to install the flame sensor; none of that happened. Ultimately, it was just a matter of following the instructions, the only exception was that I had to drill a screw-hole because the new controller is larger than the old one. One pair of the screws I had to remove from my furnace was a torx head (on the gas valve). It took about two hours to install. You will use pretty much everything you see in the picture. Then it did in fact work for me.
 
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Old 06-03-17, 02:38 PM
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Good job.

I'm well aware of what it takes to retrofit controls boards. It can be very frustrating if you haven't done it before. I buy from a supply house so I let them get the board/kit for me.

Thanks for letting us know how you made out.
 
  #5  
Old 10-27-18, 11:49 AM
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Hi,

Thanks for posting your experience. I'm pretty much going through the same thing. I have a bad 50A52 board and bought the 50A55 replacement part. I asked White Rodgers and they told me that 50A55 is backward compatible with 50A52. Would you please let me know which part of instruction refers to 50A52 part that helped you figure it all out?
Thanks!
 
 

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