Post a reply to the thread: problem with an older AAON unit form 1992
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Contractors may have been oversized over the years and are drawing more current to close. Multiple ways to fix the issue if so.
Aside from that issue, we don't have much trouble out of our older ones as we do on the newer ones.
did you give them a unit replacement option? 21 year old unit will drain you of any profit u make on the repair.
Now you just have convince them to let you to fix it!
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.
So 7 conductors and a 50' run would need 18 awg wire. 7x50=350
there are 7 conductors
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
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?
The few times I saw this problem, all of them had very long runs to the thermostat. The inside panel clearly states how many feet of stat wire you can use before you need to upsize. In our case, we were 3 times over on length and it had regular stat wire ran to the stat. Voltage on the secondary was about 22 volts even with new transformers.
Originally Posted by ryan1088 I bet you'll be back and see that problem again..... well do you have any suggestions as to what could be causeing the problem?
Originally Posted by newyorkjets Problem solved... there was multiple contactors in the heating circuit that were causing a voltage drop on the low voltage side. I bet you'll be back and see that problem again.....
Problem solved... there was multiple contactors in the heating circuit that were causing a voltage drop on the low voltage side.
does the unit have a smoke detector? we just had an aaon chatter relays and contactors intermitttantly because the smoke detector was pulling in and out.
I've just had the ghost seem to raise it's ugly head and the only way out is refrubish the circuit with new coil loads and even the t-former. Sometimes the ghost really is just "In The Machine" to quote the band The Police!
Check the limit wiring I've found the same problem on some aaon units and rub through on the limit wiring was the culprit. Also some aaons are setup to run electric heat for dehumification with compressors running.
Some of the AAON machines size their VA's very closely. Look for damper actuators,added relays (like for fire alarms) etc. Not much additional capacity is available with the OEM transformer.
Originally Posted by mikeacman something miswired or "bleeding thru" taking about the coil not heaters If something was miswired it would have to be in that heating control curcuit? What do you mean by breeding through?
Originally Posted by ryan1088 This is going to sound odd but how far away is the thermostat and how many conductors do you have going there? the thermostat is about 40 feet away and there is 7 conductors
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