Question about Aprilaire 700 Humidifier

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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 system EAC terminals - however my Honeywell 1505 board only has 1 EAC terminal and 1 HUM terminal as well as 3 unused 'N' terminals. I assume these terminals are 120VAC but not certain and not certain which two terminals to wire the transformer to. Can you clarify?

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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

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I have an aprilaire model 6303 control panel, and the B and G terminal lights are on, on the equipment output and the fan runs continously. Is the board bad or what please help


[PDF]Aprilaire® Zoned Comfort Control® Product Guide

ftp://ftp.aprilaire.com/...Control/5050_ZCC_productguide.pdf

AprilaireAprilaire Model 6303 Control Panel ... with the Model 6504 Intelligent Zoned Comfort system, we have the right control for your ... A control panel coordinates the operation of the equipment with the ..... Proper control of the fan (G-terminal) for either electric.... Auxiliary output relays available to control humidifiers, electronic.

[PDF]Safety & Installation Instructions - Aprilaire

ftp://ftp.aprilaire.com/Fulfillment/Inbox.../6404_install_guide.p...

AprilaireModel 6404. Zoned Comfort ... Do not mount the control panel on any part of the heating/cooling equipment or ... allowing for control of a humidifier. b. HUM LEDlights when the relay is closed. .... on the fan (G output terminal) with a heat call (W1output ..... Run wire between the HVAC equipment and the control panel. 3.Missing: 6303

Jan 20, 2016 | Aprilaire Humidifiers

1 Answer

I have an aprilaire 550 that is not working. I found 2 wires coming from the humidity control, one goes to the solinoid, the other is hanging in mid-air. Where is this second wire supposed to be...


Hello, it depends on what type of setup you have with your humidifier. If you have a current sensing relay or sail switch than that wire connects there, howevere, if you have the humidifier that is powered by a furnace control board than that wire will connect to the transformer that the control board is providing with 120 volts with.

Dec 27, 2010 | Aprilaire 550 Humidifier

1 Answer

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

2 Answers

Function of HUM terminal on 1Source Panel


That will work, The HUM feeds power to the humidifier when the fan is operating even in cooling on most models, However the humidistat must also be calling for humidity and probally won't call during the cooling months

Jan 15, 2010 | Aprilaire 700 Humidifier

1 Answer

I installed a 700A model on my furnace (does not have a bypass but has a fan built in). It is insallted on the supply side per the instructions. The "humidifier on" light is on when the funace is running....


try tying the 2 yellow wires together that come out of it and as long as door is on properly and unit is not defective it should start if not most likely the control board inside is bad

Dec 16, 2009 | 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

1 Answer

Aprilaire 560 does not work. No clicks


I just solved a problem with mine today.  One of my low voltage power wires to the humidity control had a bad connection.  I reconnected it and I could again hear the solenoid valve clicking as I adjusted the dial control.
I found the problem with a voltmeter:  there was voltage at the power terminals on the humidity control terminal board, but there was no voltage at the solenoid valve terminals.  It was hard to push my big wires into the terminal board, but I finally secured the connection!

Dec 30, 2008 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 600 just installed and showing an error code


No, it is not an accurate statement.

These units have simple configurations They have a water supply similar to a ice making referigerator, an enclosure connected to your supply duct that houses a prop fan and media, a seperate humidistat and a drain for excess water. Your unit may also include fancy controls including an outside thermometer & humidistat to avoid over humidification that can cause problems during freezing weather. The humidistat looks a lot like a thermostat and is located in your living space or in the return duct. The prop fan in the box pulls air from the duct, through evaporation media and back to the duct. An electric solenoid valve releases water that pours over the media.

If the humidiy is below the humidistat seting and the AC/heater is running, the Aprilaire fan starts and the solenoid valve opens. I suspect the facier controls include the flashing warning light.

The warning light spells problem. Aprilaire's customer service should be able to provide guidance for the homeowner in the form of simple checks. I suspect your contractor is avoiding a warentee call and the trip it requires.

A word of caution. These humidifiers can be powered directly from your air conditioning unit control board from an auxiliary connection. If the control board isn't rated to carry the current required by the Aprilaire fan, valve and controls or the Aprilaire encounters and electrical problem, the board can be damaged. This can be avoided by using a relay. The AC board switches a low energy relay. 120 volt house power is connected to load side of the relay and runs the Aprilaire.

My board cooked at a location near this connection, but I can't be sure that the load from the humidifier caused it since four of our neighbors also lost their board. It failed the evening of a snow storm and required a costly emergency after hours service call. The next day a new board required a three hour drive. Fortunately a fan powered propane heater kept our pipes from freezing.

Aug 27, 2008 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 550 doesn't seem to be getting power


See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw

Dec 23, 2007 | Aprilaire 550 Humidifier

1 Answer

Constant Red Light on Control Panel Circuit Board


The red light under the cover of the humidistat is fault light. This light typically indicates that there is an issue with your connection at the two wiring terminals labeled ODT on the humidistat. I would recommend checking to confirm that there is something currently connected to the two terminals. As a side note these two terminals can not be jumped out with a jumper, and must utilize either the outdoor temperature sensor (part 8052) or the manual mode resistor (part 4336).

Dec 08, 2007 | Aprilaire 400 Humidifier

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