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uberhahn · May 26, 2008, 12:10 PM

Honeywell TH4110D thermostat. Carrier 58PAV90 Furnace. Recently had to replace the carrier board, but failed to make note of the wiring for the thermostat and AC

Terminal - Wire

White - White
Yellow - Blue
Green - Green
Rc/R - Red

On the Carrier 58PAV090

Green - ?
Red - ?
Yellow - ?
White - ?
Com - ?

I also have a Red and White for the AC unit. I've tried a few combinations, but failed(blew 3A fuse).

So, where do the thermostat wires go on the furnace board, and where do the AC (Red and White) lines go? Thanks,

hvac1000 · May 26, 2008, 07:36 PM

Here is the complete manual for your furnace. It has all the drawings and diagrams.

http://www.alltemp-hvac.com/58pa-15si.pdf

uberhahn · May 27, 2008, 10:37 AM

Great, thank you. Just so I'm clear, Pg. 9, fig. 9:

The two wires from the condensing unit going to Com and Y on the furnace board - does it matter which way (Red to com, or White to com)?

Thanks again.

hvac1000 · May 27, 2008, 10:49 AM

It does not make a difference.

uberhahn · May 30, 2008, 06:26 PM

Well, I followed the wiring diagram... I also ran the R and W from the condenser as per the diagram... keep blowing the small 3A fuse. Once I disconnect the condenser, the fan and heat controls work fine.

Also, if the condenser wires (R and W) are connected to the furnace board to terminals Y and Com, and the blue wire disconnected from the Y terminal, the blower works fine, but the condenser does not start. In this case the fuse does not blow...

I'm stumped...

T-Top · May 30, 2008, 10:08 PM

Did you have problems before you changed the thermostat or was that the reason for changing the thermostat?

uberhahn · May 31, 2008, 09:51 AM

I didn't replace the thermostat. Last winter I had to replace the furnace motor (bearing seized). At the same time I replaced the circuit board in the furnace. Heating and blowing work fine. Just the AC condenser does not switch on, fuse blows.

I think I've got a short somewhere in the R W wires coming from the AC. I'll have to check that out next...

uberhahn · May 31, 2008, 11:43 AM

OK, so here's an update...

I checked the wiring itself to the condenser (AC). I disconnected it from the unit itself and checked continuity or checked for a short in the wiring. No shorts, wiring good.

I checked the "contactor" or transformer. Short. Full continuity, regardles of contactor position. I'm guessing that's the problem.

Looks like a service call... got to find the warranty info...