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Old 07-20-2013, 10:13 PM   #1
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HVAC job gone wrong? ERV and Furnace Fan always on


Hi Everyone,

First, thanks for taking the time to read. Hopeful there's a genius here that can solve this; this forum has always been a big help.

Just recently purchased a VanEE ERV 90H-V ECM and the platinum wall module to go with it. I programmed it to be off at nights, and doing some laundry just now, realized that the fan on the unit was running. Curious, I went upstairs to the wall control - and it was off. Just for kicks then, I tried turning off the fan at the furnace control, and it seems to be wired to be permanently on! Did the HVAC guys I hired screw something up or cut corners?

I'd have imagined that the ERV would only be on when it is programmed to be on. Further, I would like my furnace fan control to be restored.

I opened up the furnace and took a picture of the wiring they did. I also attached a picture of the wiring at the furnace control (a Honeywell Wi-Fi unit).

Thank you very much for your time. Hopefully the photos point to a quick fix!
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Old 07-21-2013, 02:04 AM   #2
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HVAC job gone wrong? ERV and Furnace Fan always on


remove green wire from r in first pic.

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Old 07-21-2013, 05:47 AM   #3
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HVAC job gone wrong? ERV and Furnace Fan always on


Quote:
Originally Posted by Doc Holliday View Post
remove green wire from r in first pic.
Yep. that will stop the furnace fan from running all the time. Of course, if you want/need the furnace fan to run for the ERV's fresh air to go to all the rooms. It won't.

Good chance the guys that wired it, didn't understand how to wire it up.
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Old 07-21-2013, 06:35 AM   #4
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HVAC job gone wrong? ERV and Furnace Fan always on


Thanks for the answers gents. I suspect I'm to make that stray 'G' rejoin its fellows on the 'G' terminal of the furnace block?

Before I do that (after I eat some breakfast!), am I correct in assuming that the ERV's motor should only be whirring when it is exchanging air, or is it normal that it's spinning 24/7?
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Old 07-21-2013, 06:38 AM   #5
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HVAC job gone wrong? ERV and Furnace Fan always on


Only when its suppose to be on.

When you take that end off the R terminal. Also remove it from the G terminal.

You might want to see how the ERV is wired up. probably gonna have to redo it.
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Old 07-21-2013, 08:14 AM   #6
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HVAC job gone wrong? ERV and Furnace Fan always on


not wired properly. on HRVs and ERVs there is an interlocking relay on the circuit board to turn the furnace fan on when there is a demand from the erv. the high end units also can run on low for air circ continuos. need to run a wire from the erv to the furnace and they did not do it or know how. call them back. info should be in the install manual .page 16, I found it online. google the brand and model and the manual is on their website.
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Last edited by yuri; 07-21-2013 at 08:26 AM.
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Old 07-21-2013, 06:43 PM   #7
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HVAC job gone wrong? ERV and Furnace Fan always on


Hi Yuri,

Was just about to ask if that part was optional - guess I got my answer. R to NO and G to C from Furnace to ERV weren't run. I'll do it myself rather than call them back.

I had one last question, thanks again. It's actually a rehash of an older answer I'd gotten on these boards I was sure, but I can't find the darned thread. I have a Honeywell HE260A (manual here https://customer.honeywell.com/resou.../69-1645EF.pdf) that when wired per instructions, runs anytime the fan is on. I had gotten instructions from someone on these boards on how to piggyback on a connector to have it run only when the heat is on (since I run the fan quite a bit to get air through my Lennox PureAir system).

Of course, the HVAC guys I hired just undid everything and wired it back up on the cheap per the instructions; I forgot where that piggyback was. Memory has that it was on this thing here... is that right?

Thanks again, 1000x
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Old 07-22-2013, 08:04 AM   #8
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HVAC job gone wrong? ERV and Furnace Fan always on


Yep. when it calls 4 heat it sends 24 volts to the pressure switch B4 starting the burner so that is a 24 volt heat source which is what U want. then U don't need the 120/24 v transformer. other side of the hum goes to C on the board.

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Last edited by yuri; 07-22-2013 at 08:11 AM.
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