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Old 04-24-2012, 02:50 PM   #1
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Air Exchanger and A/C fan


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.

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Old 04-24-2012, 04:41 PM   #2
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Air Exchanger and A/C fan


not normal...

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Old 04-25-2012, 12:06 AM   #3
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Air Exchanger and A/C fan


So if it is not normal, is it an easy fix or do i need to call someone?
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Old 04-25-2012, 08:36 AM   #4
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Air Exchanger and A/C fan


Sounds like an interlock issue. Likely need to get an isolation relay installed.
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Old 04-25-2012, 11:47 AM   #5
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Air Exchanger and A/C fan


It is normal. It depends on how you want it. In most cases, the system fan has to be on first. but in same areas with nice weather amost all the time, the system does not kick on that often, in that case, you want the air exchanger to control the system fan when the system is not running, so you still can get air circulation per your pre-set schedule. talk to the air exchanger dealer, they will tell you how to do this.
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Old 04-25-2012, 11:51 AM   #6
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Air Exchanger and A/C fan


In the winter when the air conditioner is not running and the unit is covered, I am assuming you don't want that air exchanger turning the a/c fan on under the cover?
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Old 04-25-2012, 05:45 PM   #7
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Air Exchanger and A/C fan


Here I am talking about is the fan in the air handler which circulates the air inside of your house and also brings the fresh air into the house from outside (this is not the outside condenser fan), It works the same way on either A/c or Heat.

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Old 04-27-2012, 12:27 AM   #8
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Air Exchanger and A/C fan


So I had someone tell me the following. Is installing a relay like this possible for a DIYer or do I need to call someone?

Before you had the AC installed the HRV was interconnected to your furnace/airhandler fan. The a/c guys tied into this same system. When your tstat calls for a/c, an inter connection in the tstat brings the air handler fan on also. What is happening to you is it is back feeding so when you turn on the HRV, the a/c turns on as well. This is very bad. To verify if i'm right, turn on your hrv and if the a/c is on, flip the fan switch on the tstat to "on". The a/c should turn off.
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Old 04-27-2012, 01:46 AM   #9
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Air Exchanger and A/C fan


It is not easy for a DIYer to do this if you don't have the air exchanger's installation manual. It has several wires that have to be connected to the
control board, and like I said, it may have 2 different ways to install it (depends on the type of unit you have and what you want, you can let the A/C fan control the air exchanger, or let the air exchanger control the A/C fan). Not sure what kind of air exchanger unit you have. Is it a simple on/off unit or a more advanced programmable unit ? The installation manul should tell you all the details. without the manual, you better call the dealer.

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