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Aprilaire 700 wiring with TH8000 Thermostat?

Trying to operate Aprilaire 700 humidifier using U1 settings in a Honeywell TH8000 Thermostat. Using system 24v transformer, can get T'stat to turn on fan, but no 24v at two low voltage wires to humidifier. T'stat info says to bond R to U1 assumed nearest U1 terminal and I put other humidifier lead to opp. U1 terminal? Answered: Jumper R & U1 (power to relay), One humidifier lead to other U1, Run Com from Furnace to other lead on humidifier. Enables T'stat to close circuit! Note! Only had 4 wires to house T'stat, no common.

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Anonymous

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Posted on Jan 02, 2017

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butch welch

  • 147 Answers

SOURCE: Aprilaire 700 operating at wrong time

You want the humidifier to run in heat mode which is the r-w1 terminal on the stat.

Posted on Nov 17, 2008

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laura Newman

  • 415 Answers

SOURCE: connecting an Aprilaire 700M to my HVAC system. I

If you don't have a volt meter, purchase one. I've seen them as low as $20.00 at Sears and even lower at Home Depot and other discount stores. The HUM terminals are most likely low voltage (24v). The "N" is the neutral. Assuming you have confirmed this is low voltage (24v, you will use HUM and "N" terminals. This control sequence is typically to allow for operation of your humidifier only when there is a call for your fan to run. The brown wires coming from your Humidifier are your low voltage circuit. One should be directly wired to "N". The other should be ran to your humidistat. The other side of the switch of your humidistat should be wired to the HUM terminal.
I hope you will find this helpful. Good Luck!!!!

Posted on Feb 07, 2010

cagreenw1

  • 77 Answers

SOURCE: I hooked up a honeywell

If you have very old furnace, does it have a blower with a belt. If it does it should only have 2 wires going to blower. If it has 2 you should be able to use the transformer you have plugged into wall and splice into 2 wires going to blower. If you have more than 2 wires to blower, you will need to find out which one is used for heat plus use the white one. If you have a voltage sensor you should be able to find it easily.

Posted on Jan 24, 2011

drifterK

Catalin Turcu

  • 4924 Answers

SOURCE: I have installed an aprilaire humidifier and its

in theory should work ..the idea is to run the humidifier in parallel according to the power source ..and serial with the low voltage thermostat ..so ..the plus on the humidifier to go trough the thermostat in order to have power on he right conditions ..but in the same time tide to the source in parallel to do not interfere with other wiring ..and also to run independently of the heater..The heater remaining just an option when needed..Its not rocket science ...

Posted on Jan 24, 2011

Joe Paxton

  • 9 Answers

SOURCE: Model 800 Aprilaire steam humidifire I have

Follow manufacturer instalation instructions. Why risk your equipment and you family's health to save a few bucks and a lil trouble on the proper parts. Your family is worth it, now go do the right thing. :)

Posted on Feb 01, 2011

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1 Answer

I have a aprilaire 700 I just installed on return plenum. Have a problem with the wiring, the instruction say to connect the R&C wires from humidistat to the same on furnace power strip. Is the C


Depending on the age of your furnace you may have an aux terminal for a humidifier. If not, you should use the white wire (heat) coming from the homes thermostat to power up the humidistat and ultimately bring on the humidifier. This way it will only run when in heating mode.

Nov 16, 2012 | Aprilaire 700 Humidifier

1 Answer

Model 800 Aprilaire steam humidifire I have


Follow manufacturer instalation instructions. Why risk your equipment and you family's health to save a few bucks and a lil trouble on the proper parts. Your family is worth it, now go do the right thing. :)

Jan 24, 2011 | Aprilaire 550 Humidifier

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Aprilaire 700. It works on fan on mode but not otherwise. It's never on and the humidity reading is always way below the setting. It should turn on automatically to bring the humidity up, right?


It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.

Thank you for giving us the opportunity to be of service
Sincerely,

Brad Uselmann
Technical Support
Research Products Corporation
www.aprilaire.com

Nov 01, 2010 | Aprilaire 700 Humidifier

1 Answer

Connecting an Aprilaire 700M to my HVAC system. I do not have the wiring diagram for the fan control board for the HVAC system. Aprilaire diagram says to wire the 120VAC to 24 VDC transformer to the HVAC...


If you don't have a volt meter, purchase one. I've seen them as low as $20.00 at Sears and even lower at Home Depot and other discount stores. The HUM terminals are most likely low voltage (24v). The "N" is the neutral. Assuming you have confirmed this is low voltage (24v, you will use HUM and "N" terminals. This control sequence is typically to allow for operation of your humidifier only when there is a call for your fan to run. The brown wires coming from your Humidifier are your low voltage circuit. One should be directly wired to "N". The other should be ran to your humidistat. The other side of the switch of your humidistat should be wired to the HUM terminal.
I hope you will find this helpful. Good Luck!!!!

Feb 06, 2010 | Aprilaire 700 Humidifier

1 Answer

How do I know my aprilair 760 humidifier is working?


A simple check you can perform on your aprilaire 760 is the following:
1) locate the two brown wires coming out of the 760 (these wires will be wired to tell the 760 to turn on when the hvac bower is on and the humidistat is calling for moisture).
2) temprarily disconnect the two brown wires from the external wiring and then short the wires together. All you're doing here is bypassing the your thermostat and bower-on indicator.

With the 70 unit plugged in to the wall outlet and the two brown wires connected together, both the fan and the solenoid valve (water inlet valve) should both be activated.

Dec 13, 2009 | Aprilaire 700 Humidifier

2 Answers

Aprilaire 700 only works in test mode.


connect two wires at humidifier without any wirng connected if works problem is in wiring or humidistat

Oct 28, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 700 using too much water-------


There is a small oriface that is installed next to the solenoid valve. It sounds like this oriface is missing. It reduces the water flow through the humidifier when it is working properly. You should be able to disassemble the solenoid fittings to check and see if the oriface is in the water line. For a "temporary" fix regulate the water pressure down by closing down on the saddle valve.
Good luck
HVAC Teacher

Feb 25, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 700 operating at wrong time


You want the humidifier to run in heat mode which is the r-w1 terminal on the stat.

Nov 17, 2008 | Aprilaire 700 Humidifier

1 Answer

Humidifier control .


if humidifier was wired into thermostat circuit for power instead of seperate transformer , this can happen. you need to see if you voltage going to the solenoid valve. if you do , and it isn't opening, the valve is bad . this is assuming that it is using a # 50 relay to come on only when the fan runs . . make sure the water valve is open

Dec 24, 2007 | Aprilaire 700 Humidifier

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