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I have a old Lennox defroster circuit board that as failed

Customer Question
(see picture). I can not...
I have a old Lennox defroster circuit board that as failed (see picture). I can not find an match for this? It uses two input sensors, ambient temperature sensor and coil sensor. Unfortunately the model numbers on our old heat pump have faded and are unreadable. But the heat pump still works fine! I just need a defroster board. There is a number on the board I have; it is: EIA232D Is there a kit that will replace it?
Submitted: 2 years ago.Category: HVAC
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Answered in 3 minutes by:
1/15/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,788
Experience: Furnace, A/C and heat pump specialist.
Verified

Take a look at this board and see if it looks like your board

http://www.amazon.com/Upgraded-Replacement-Lennox-Defrost-Control/dp/B00EEEBZNY

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Got any idea how old unit is or do you have a picture of unit? That one was an upgrade for the old Hp7,8,9 and 10

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Customer reply replied 2 years ago
you mean a picture of the entire packaged unit?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Yes, picture might help me identify

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Customer reply replied 2 years ago
here's a pdf on it that's a match to the unit.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Take a look at this upgrade kit and tell me if you have those RST and HOLD terminals

http://www.mediafire.com/view/99sxx6527hxk8k5/61h42.pdf

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

This shows to be the replacement for the CHP10 packaged unit

http://www.hvacpartsshop.com/61h42--lb-83114cadefrstkt.aspx

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

It does to me. I can not see all the letters by your terminals, The AC plus and AC minus are labeled 24v and Com on new board.

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Customer reply replied 2 years ago
Let me help clarify: The letters by the four terminals on my existing board are: "R" "R" "AC" & "+AC" The two R terminals go to a 24 volt relay (the part # ***** this relay is midland ross 23C100) , the "AC" terminal goes to a yellow wire that ends up on the 24 volt control transformer, the last remaining wire goes to the reversing valve ( I think?) . Do you think this replacement board kit will be able to work with my existing system which ONLY has four wires?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Is it possible that that wire you think goes to reversing valve may go to a high pressure switch on refrigerant line?

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Customer reply replied 2 years ago
no, because cause at some time in the past, one of the hvac guys cut the wires on high pressure switch, perhaps originally it went to the this valve? Also, there's be added "delay on make timer" that's been added at one time in the past. What's so frustrating is that the wiring diagram on side of the unit has peeled away. I would really like to get a wiring diagram of how this beast was originally wired. Can you provide this diagram?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Doesn't look like anything I have goes back that far on wiring diagrams.Will se what I can come up with

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Customer reply replied 2 years ago
That would be great! Please email me anything you find ***@******.*** Thank you so much for your time. Would I be able to pick up this conversation with you later? Any ideas on cost for follow up? same price as this time? What's the hours you work? etcetera, etcetera
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

WE can continue here tomorrow,If I find anything, I will respond here.We can leave the question open until we are done.

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Customer reply replied 2 years ago
thank you again and good night
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Good night

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