Wiring Tjernlund Airshare

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Old 01-28-18, 12:59 PM
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Wiring Tjernlund Airshare

I have an Aprilaire 360 whole house humidifier wires to a nest thermostat. Everything works as expected.

I have a Tjernlumd AS2 that moves air through a wall in my house to an adjoining room. Iím wondering if there is a way to wire the 24v connections so that the airshare operates with fan of the humidifier?

wiring diagram can be found here: https://tjernlund.com/Tjernlund_FC24...er_8504210.pdf
 
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Old 01-28-18, 03:04 PM
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Follow the modified diagram. You won't be using the 24vac transformer on the FC-24. You will need to connect the identified yellow and violet wires to the same place the humidifier solenoid connects.

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Last edited by PJmax; 02-17-18 at 08:40 PM. Reason: updated diagram for timer
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Old 02-03-18, 08:00 PM
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Hi, Pete!

I got this all wired up today, but I need some troubleshooting.

I wired as you indicated, but the Aireshare fan runs continuously. I'm trying to get it so that it only runs when the humidifier turns on and off.

I have the Aireshare yellow and violet wires connected to the same relay terminals as the humidifier solenoid wires.
 
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Old 02-03-18, 08:11 PM
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Does the solenoid remain energized too ?

The 360 may be a power humidifier. Can you remove the external wiring to it and just try shorting the two solenoid wires together. Does that energize the solenoid ?
 
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Old 02-03-18, 08:19 PM
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I went through it all again, and now I have a situation where the units operate opposite. When the humidifier is on, the aireshare turns off, and vice versa.
 
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Old 02-03-18, 08:22 PM
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Yes, when I short the two solenoid wires together, the humidifier comes on.
 
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Old 02-03-18, 08:29 PM
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Ok.... disconnect the aireshare unit.
Do you have a relay connecting the 360 to the nest..... you should ?
 
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Old 02-03-18, 08:30 PM
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Yes, I have a relay connected between the 360 and the nest
 
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Old 02-03-18, 08:33 PM
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Ok..... cool. The airshare needs to connect to the nest side of the relay. The coil side.
 
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Old 02-03-18, 08:34 PM
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Cool. Let me try that out. Right now I'm connected to the solenoid side.

I'll be back in 10 minutes to give you an update!
 
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Old 02-03-18, 08:53 PM
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Booyah. That solved it.

Thanks, Pete!
 
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Old 02-03-18, 09:01 PM
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You are very welcome...........
 
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Old 02-04-18, 07:47 PM
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Hey, Pete. On a similar note, is it possible to do the same thing with the Tjernlund ASLL (through the floor unit)? Is there a way to wire it to the same relay?

https://tjernlund.com/Tjernlund_ASLL...%208504156.pdf
 
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Old 02-04-18, 08:10 PM
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That unit has no internal switching relay.
In order to have the nest control it.... it will need its own relay.
 
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Old 02-15-18, 10:13 PM
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Thanks again for your help, Pete. The Aireshare works as it should with the humidifier.

Now to add some complexity, I have another question. Given the wiring you suggested, is there a way to modify the setup so that the Airshare can run for 10 extra minutes after the humidifier shuts off? Is it possible to link in something like this timer relay?

https://www.tjernlund.com/Tjernlund_950-1067.pdf
 
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Old 02-17-18, 08:42 PM
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Ok.... I added the timer module into the original diagram in post 2.
The module input gets connected to the same 24vac as the relay. No polarity.
The three numbers in red refer to the timer terminals.
 
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Old 02-17-18, 08:51 PM
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You are awesome!

Can the FC24 be removed? Or does the timer get wired into the existing setup?
 
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Old 02-17-18, 08:53 PM
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The FC24 keeps the fan running when there is 24vac present.
The timer only runs the fan for a short (delayed time).
So both need to be used together.

Hmmmmm..... does the timer keep the fan on and when the 24vac gets removed... the countdown starts. That is the question.

I don't know 100% if the timer can replace the FC-24. It may be able because it's a post purge timer. Holds closed when powered and for XX minutes after power is removed..
 
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Old 02-17-18, 09:07 PM
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Thanks, Pete. I'll wire it up tomorrow night or Monday and let you know.
 
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Old 02-18-18, 10:37 AM
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The timer relay works without the FC24. Awesome.

This opens up some more possibilities for me now. Thanks, Pete!
 
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Old 02-18-18, 10:40 AM
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Nice job.

Thanks for letting me know. I'll remember that for the future.
 
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Old 02-18-18, 01:26 PM
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So now I have a humidifier hooked up in my finished basement. It is wired to a nest thermostat on the first floor by way of a relay between the boiler and the humidifier. I also have the AS2 Aireshare wired to this setup, so the Aireshare comes on with the humidifier to draw air up to the first floor. It works well. And the timer relay on the Aireshare runs the unit for 10 additional minutes once the humidifier shuts off as determined by the Nest

Now for the the next phase: I would like to put an Aireshare ASLL through-the-floor unit on the opposite end of the basement to operate the same way as the AS2. Besides running 120v to the ASLL, I imagine I will need at least a 120/24 transformer and another timer relay. I canít really wrap my head around how to make all of the necessary connections. Iím wondering if this is something you could brainstorm for me?
https://tjernlund.com/Tjernlund_ASLL...%208504156.pdf
 
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Old 02-18-18, 01:31 PM
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You could just run a piece of 14-2 w/ground NM-b (romex) cable from the working unit to the new one. This cable would bring switched 120v to the the new unit.
 
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Old 02-18-18, 02:33 PM
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Well, thatís easy!

Can I splice into the Romex feed line, or do I need to pigtail the black, white, ground wires in the AS2 box where all of the other connections are made?
 
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Old 02-18-18, 02:41 PM
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Not sure what you are asking.

The romex connects at the timer module and then at the new new unit. You can't just have connections in midair so it does need to go to some type of box.
 
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Old 02-18-18, 03:07 PM
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Sorry. To be more clear:

I have access to the romex line right right next to where I will install the new ASLL. Can I put in a work box and splice in a branch to the ASLL?

Or, as I think you are saying, I need to connect to the pigtails where the timer relay is installed.
 
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Old 02-18-18, 03:16 PM
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You need to get power from the first unit. Where the timer is installed. A timer module can only switch one circuit so you can't connect to any existing live romex cable.

Your second unit will connect to N, splice 1 and ground as based on the diagram in post 2.
 
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Old 02-18-18, 03:26 PM
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Perfectly clear. Thanks for all your help, Pete.

Iím sure Iíll come up with some other crazy idea!
 
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Old 02-18-18, 07:49 PM
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And, finally, not even sure this is possible:

During the summer months, I run a dehumidifier in the finished basement. In the winter months, it's not necessary; however, there are some days like today when it's warm outside and the basement humidity goes up to 50-55% (about 10% higher than the first floor).

Is there a way to wire the basement Nest to the same AS2 and ASLL fans, so that they would turn on when the basement humidity went above 50%? Just shooting for the moon here ...!
 
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Old 02-18-18, 11:14 PM
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You mean use the upstairs nest for humidifying and the downstairs nest for dehumidifying ?

You can't have the two nests tied together. You would have to switch wiring from one to the other.
 
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Old 02-18-18, 11:44 PM
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Yup, thatís what I meant, but I understand what you are saying.

Instead of linking both Aireshares together, what if I used the basement Nest to run the second fan for dehumidify? Is that possible in heating mode? And are we back to needing a 120/24 transformer and a relay?
 
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Old 02-19-18, 01:58 PM
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Talked with Nest support today. They say the basement Nest can be used to run a fan to dehumidify while in heating mode. Understandably, they wouldn't give me more specifics though because I'm not a Nest Pro.
 
 

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