Wiring help for control board conversion harness

[Greg5OH]

Hello, i need to replace the control board in my ADP CUH45 heater. New control board should come with the 9 pin to 6 pin conversion harness. Its backordered with no eta. Im going to make my own but the picture i saw of it has me confused.

I have the old original diagram, and this is the new board diagram, and a super fuzzy picture of the harness itself.
the white wire running off is for the flame sensor which has its own dedicated plug on the new board.
I see the difference is how the PSW and HIL switches are wired.
Why is there a wire running off with a spade connector on the factory harness?

Old board


New board


Crappy pic of the harness


and my little mockup I was going to match the numbers.

 

[Done That]

Google "Neuco 19m54" I'm thinking that pdf might be your install instructions?

 

[Greg5OH]

Thanks that was helpful.
This is what I got

and then



I can confirm I have two orange wires meeting at one of the pressure switch terminals. So I understand I snip the orange wire from the limit switch to the pressure switch.
My new blue jumper wire goes from the 9 pin adapter side to the now open pin on the limit switch.

Now just wondering, on the harness Im building do I run that wire from terminal 1 or 9? (according to my old schematic?)

TIA

 

[Done That]

I'm guessing from #1.... It appears to me that would be the 24v power side since #9 is marked as the return... But again just an educated guess.

 

[Greg5OH]

What I have right now..im not sure if #9 is correct


OLD / New

1 Lim out (brn) ---> Blue jumper to limit switch (detach old orange wire)
2 Not used
3 Vlv rtn (ylw)--->3 Vlv rtn (ylw)
4 psw rtn (red)--->5 psw rtn (red)
5 Hil rtn (orn)--->1 hil rtn (orn)
6 Flame sns---> direct to board
7 vlv out (blu)--->4 vlv out (blu)
8 hil out (blu)--->6 hil out (blu)
9 lim rtn (brn)--->2 psw out (red)


Im sure im messing something up here..not sure on 9?

 

[LS6 Tommy]

The difference is the Hi Limit used to be in series wit hthe PSW. Now the Hi Limit is in series with the rollout and the PSW is a separate circuit.

Theoretically the wires on #9 and #1 terminals are interchangeable. It's an alternating current, series circuit with two contacts between the terminals. It doesn't "know" which way the circuit "flows".

Tommy

 

[Done That]

Theoretically the wires on #9 and #1 terminals are interchangeable. It's an alternating current, series circuit with two contacts between the terminals. It doesn't "know" which way the circuit "flows".

Tommy

Tommy just not sure how this particular board is designed. Depends how the software is setup to read the circuit. Sometimes it is looking at a specific pin to declare a fault, not either / or. The code "expects" one pin to provide power and another to receive.

 

[Greg5OH]

Thanks for the replies. It is my understanding that the pinout i provided is ok, pending verification of pin 1 and 9 sw logic, via a good old fashioned; try one way if it doesnt work-swap them?

 

[C2F]

Thanks for the replies. It is my understanding that the pinout i provided is ok, pending verification of pin 1 and 9 sw logic, via a good old fashioned; try one way if it doesnt work-swap them?

Yes correct. The way everything is wired on the board is to allow for easy diagnostics.

After you have it all wired test to make sure all the safeties are wired correctly by disconnecting a wire on each safety as the system is running. Do this one by one after each restart to be sure all the safeties are wired in series correctly.


Sent from my iPhone using The Garage Journal mobile app

 

[LS6 Tommy]

Tommy just not sure how this particular board is designed. Depends how the software is setup to read the circuit. Sometimes it is looking at a specific pin to declare a fault, not either / or. The code "expects" one pin to provide power and another to receive.

That's not what I was trying to explain. The software won't know the difference, either. This particular AC circuit doesn't work that way. If pin #1 supplys 24VAC and pin #9 is supposed to receive it, if one of the safeties opens the software doesn't know why pin #9 isn't getting 24VAC, just that it isn't. If the wires are backwards on the pins, the circuit still functions exactly the same.

Tommy

 

[Done That]

that's not what i was trying to explain. The software won't know the difference, either. This particular ac circuit doesn't work that way. If pin #1 supplys 24vac and pin #9 is supposed to receive it, if one of the safeties opens the software doesn't know why pin #9 isn't getting 24vac, just that it isn't. If the wires are backwards on the pins, the circuit still functions exactly the same.

Tommy

10-4

 

[Greg5OH]

im dumb, didnt realize there was the actual pinout further down inthe instructions for the conversion harness. was a littel different than what I wrote, hooked it the way it was called for, we have heat again! just in time as temps are dropping around 0F tonight