04-27-2013, 04:33 PM
Well Chester that sounds like progress. I think you have picked the low hanging fruit and it may get tougher from here.
It may help to try and take it slowly a system at a time. By that I mean just start trying to figure out what is going on with the stage one components - that's low speed on the evaporator fan, low speed on the condenser fan, and compressor number 1 running. Remember, if you have not changed thermostats, just select AUTO Low Fan and you get only stage 1. It is not easy to get a clamp-on amp meter around the wires going to each of those motors. Do you think you can do that? If so that will help you understand what is really stopping after that 20 minutes. You know the evaporator fan is still running, but it would be difficult to tell when the condenser fan stops if the compressor motor has stopped or not. Probably you could tell by listening outside at the unit, but a meter would be better. As Richard already said, if the condenser fan does stop with the compressor still running this will eventually overload the compressor motor due to high head pressure. I wonder if those motors have any kind of internal thermal overload protection. If they do it is probably self resetting as there is no way to get to a reset button that I know of.
It would be nice if you had a spare control board to swap into the front unit to see what that would do.
The high pitched noise can't be good. I have posted below current readings taken from my units that are operating normally.
Compressor #1 8.7 amps Compressor #2 9.0 amps
Evaporator fan High speed – 3.4 amps Low speed 1.7 amps
Condenser Fan High Speed - 2.8 amps Low speed 1.9 amps
Russ
It may help to try and take it slowly a system at a time. By that I mean just start trying to figure out what is going on with the stage one components - that's low speed on the evaporator fan, low speed on the condenser fan, and compressor number 1 running. Remember, if you have not changed thermostats, just select AUTO Low Fan and you get only stage 1. It is not easy to get a clamp-on amp meter around the wires going to each of those motors. Do you think you can do that? If so that will help you understand what is really stopping after that 20 minutes. You know the evaporator fan is still running, but it would be difficult to tell when the condenser fan stops if the compressor motor has stopped or not. Probably you could tell by listening outside at the unit, but a meter would be better. As Richard already said, if the condenser fan does stop with the compressor still running this will eventually overload the compressor motor due to high head pressure. I wonder if those motors have any kind of internal thermal overload protection. If they do it is probably self resetting as there is no way to get to a reset button that I know of.
It would be nice if you had a spare control board to swap into the front unit to see what that would do.
The high pitched noise can't be good. I have posted below current readings taken from my units that are operating normally.
Compressor #1 8.7 amps Compressor #2 9.0 amps
Evaporator fan High speed – 3.4 amps Low speed 1.7 amps
Condenser Fan High Speed - 2.8 amps Low speed 1.9 amps
Russ
Russ White
2016 Winnebago Vista LX 30T
#530 ( Sold )
1999 45' Double Slide - Factory upgrade 2004