Any HVAC experts?

[The Guy]

Originally Posted by Seriak

So I have a question about my air exchanger. When we initially built the house, they told us they installed an air exchanger as these new houses are somewhat air tight. They said to be careful how much I use it as it could increase my electric bill if I keep blowing all my hot air outside and my furnace has to run more often to keep the house at a certain temperature. Anyways, years later we had a A/C unit installed and connected to the furnace. We still hadn't really used the air exchanger up to this point. I recently turned on the air exchanger while my furnace thermostat was set to off just to circulate the air in my house. I noticed that the fan on my A/C unit would run when the air exchanger was on. It was not cooling the air but it was running continuously while the air exchanger was on. Is this normal? I don't know much about these things.

Yes if you are running the air exchanger the furnace fan will come to replace the air in the house that the exchanger is removing from the house. Air going out has to be replaced with air from your furnace it will have a fresh air outside connection that pulls in the fresh air to accomplish this. This is a typical hook up in the newer homes.

[Seriak]

But should my air conitioning unit fan come on as well. I am okay with the furnace fan being on. Would that mean I cannot run my air exchanger in winter as my air conditioning unit would be covered and I am assuming you shouldn't have the fan running under the cover.

[cwatkins]

I don't think the fan on the outdoor A/C condensing unit should be running...

If it's running, it probably means the compressor is running as well, which means your A/C is effectively ON.

[Seriak]

Originally Posted by cwatkins

I don't think the fan on the outdoor A/C condensing unit should be running...

If it's running, it probably means the compressor is running as well, which means your A/C is effectively ON.

That is what I thought, but when I went to the registers it was blowing warm air not cold air and the thermostat was set to off. As soon as I turned off the air exchanger the fan stopped turning on the a/c unit. Since then I have had the a/c on and it blows cold air just fine. I am at a loss. Maybe I will go turn the thermostat to heat and see if the air exchanger still turns on the a/c unit.

[Delphinus]

That seems really weird to me - can you call the place that did the installation?

[Seriak]

Originally Posted by Delphinus

That seems really weird to me - can you call the place that did the installation?

Unfortunately, they were not that great to deal with in the first place and it was so many years ago they wouldn't do it for free now. I just talked to an electrician friend and he suggested that if everything else works fine, he would just turn off the breaker for the air conditioner in the winter and not worry about it although it did sound to him as if they wired something wrong.

[subman]

I had something like this in my last house. When we turned on the circulating fan the AC compressor would start. I was told it had to do with the relays for the fans and they would need to be changed. I never did, I just tuned the breaker of for the AC off.

[ILIKECOUGARS]

Originally Posted by Seriak

I just talked to an electrician friend and he suggested that if everything else works fine, he would just turn off the breaker for the air conditioner in the winter and not worry about it although it did sound to him as if they wired something wrong.

Why don't you ask your electrican friend to install a relay for you?

I alway turn off the breaker to the ac in the winter.