I installed a new heat exchanger to give me central heat and air. I will install the air unit later, but right now I want heat. A friend who supposedly knows this stuff and I have hooked it up and we haveblown fuses and ruined about 4 transformers and when we didn'tblow a fuse, he said the transformer was putting out 40 some voltswhen it should have been 24.The unit is a York model AHP24B3XH21H. I don't understand220V, so please explain it to me. I didn't think you needed a neutral.This is how I think it should go: There are 4 wires coming from the power source, red, black, white and bare. On the top power block there is purple(or blue) wire going to the transformer, and two black wiresgoing to a relay I guess and then to the heating element. On thebottom power block there are three yellow wires, two going to the heating element and the other going to the transformerThis is what it says on the transformer:PRI COM 120/218/240VWHT BLK RED ORG SEc.: 24V BLU-YELI don't know which power wire is COM and witch is PRI. I assume the black is PRI and goes to the top block. The RED and ORGare not used. The blue goes from the upper power block to the blue wire on the transformer. The yellow goes from the lower power block to the yellow wire on the transformer. There is also a yellow wire from the transformer to the circuit board and thena yellow wire from there to the fan.Please send a complete wiring diagram and/or explain it to me.Pictures from TinyPic: 1. <a href="http://tinypic.com?ref=20afl08" target="_bl 3. 4. 5.
I explained in the question what we did.
Give a minute to look at your pictures
In the first picture, there are three screw terminals on the relay. The top two are where you connect the hot wires of your 220v. The bottom terminal with the green screw is for the ground. You do not need a neutral in this application.
It sounds like the transformer was tapped for 120v. Are you sure this is a 220v unit?
Never mind I can see the name plate in the first picture
The transformer needs to connected on the 240v and common terminals.
Unfortunately if the transformer was connected wrong and was indeed putting out 40v, it might have damaged the circuit board as it is only designed to run at 24v.
Let me know what else you need.
You're right. So I will attach the black power to the top terminal and the red power to the lower terminal and the bare to the bottom terminal, or is it the white? If not, why is the white even there.
Now on the transformer to I connect the black wire from the top terminal to the PRI and the yellow wire from the lower terminal to the COM?
No, I guess it's the purple wire from the top block to the PRI, right?
See were the purple and yellow wires from the terminals are spliced with wire nuts?
I'm checking here about every hour. I guess if you'd tell me which wire goes where if you were hooking it up, I could accept the answer.
Attach the bare wire to the ground. Pretend the white isnt even there.
Purple and yellow go to the primary side of the transformer. Connect to the 240v and the common.
23 years as a journeyman electrician, general maintenace