problem with an older AAON unit form 1992

[newyorkjets]

The unit did have small diameter stat wire that had been spliced in one spot originally installed. When i seen this i did change out the stat wire. I did check the voltage at the coil after the repairs were made and had 25 volts. The stat is about 40 to 50 feet away from the unit... i didnt see anything saying a minimum distance... do you remember what it was?

[ryan1088]

How many conductors do you have running to it?

Here's the chart in the iom:
200'= 20 ga
350 =18
500 =16
750= 14
1250= 12

[newyorkjets]

there are 7 conductors

[ryan1088]

So 7 conductors and a 50' run would need 18 awg wire.

7x50=350

[newyorkjets]

well come to find out we have been there numerous times in the past replacing contactors... so this makes sense. I believe it was 20ga wire installed in the unit before i changed it. This would explain why the coils were burning out.

[ryan1088]

Now you just have convince them to let you to fix it!

[rcac101]

did you give them a unit replacement option? 21 year old unit will drain you of any profit u make on the repair.

[ryan1088]

Aside from that issue, we don't have much trouble out of our older ones as we do on the newer ones.

[Sicofthis]

Contractors may have been oversized over the years and are drawing more current to close.
Multiple ways to fix the issue if so.