Question about Aprilaire 600 Humidifier

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Aprilaire have a aprilari600 hooked up to a ruud 90 +. put in a outdoor wood boiler.now the aprilaire will not run because the bruner plate is not runing is there a way to hook it to the blower fun to run with the hot water boiler.at this time it will not trun on without the bruner plate lighting

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  • firechiefm Mar 07, 2009

    I have the same situation with a Bryant furnace that has a heat exchanger from the wood boiler installed. I have read where someone suggested we might be able to add a 24v. transformer, powered off the wires that supply the fan motor. It was said that the transformer gains its power through induction so there is no need to cut the wire to the motor. The transformer would then in turn power the humidifier control/solenoid valve. I have yet to try it but it sounds promising.

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Commonly outdoor wood boilers use a hot water coil mounted in the ductwork above your furnace. In this application the Ruud furnace is still using its blower assembly to circulate the warm air from the boiler to your home. If this is the case. Have your heating guy install a #50 relay on the furnaces blower motor to activate your much needed humidifier. If this is not the case and your Ruud furnace is totally independent of the boiler. Still install the #50 relay in the furnace and manualy activate the fan only feature on your thermostat.
Good luck
HVAC Teacher

Posted on Mar 08, 2009

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1 Answer

Problem with 2 ....1 on each furnance Aprilaire 700 Humidifiers.. no fan no soilinoid click red light on one when furnance is runing they both worked last year


Odd for both to be out. Check the water supply sometimes corrosion or scale will block the saddle piercing valve. Run it all the way into the pipe. Usually need to spin the little valve handle clockwise. Then back it all the way back to full open and reset humidifier power and furnace power. After that may want to crack open water supply connection right before the solenoid at each humidifier to make sure water is getting to them.

Nov 30, 2013 | Aprilaire 700 Humidifier

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I have an Aprilaire 550 hooked up to my furnace,


in order for the humidifier to come on with the heater there has to be a temperature sense curuit to turn it on/off at a certain temp, the humidity curcuit on the unit will turn it off at set %

Jan 31, 2010 | Aprilaire 550 Humidifier

1 Answer

Why two 24 Vac on aprilaire 700's control unit?


Okay, I looked up the installation manual online to see exactly what you are working with.
Yes the R anc C need to be hooked to the transformer supplied with the unit. The primary 120v side needs to be hooked into the power coming into the furnace. this can easily be done were the L and N get hooked into your furnace or circuit board on the furnace. This will provide the contiuous power to the unit. Preferably you will hook this after the door switch of the furnace so that you will kill the power toit if you take the blower door off.
The ODT terminals are for the outdoor sensor if you want to hook that up it will vary the humidiy in your home according to the outdoor temperature then.
Now the W/G and Cf terminals. If you have 24v coming from the HUM terminals of your furnace you DO NOT need a second transformer. You must check your furnace manual or check the voltage to them with the furnace blower energized. The HUM terminals will only have power to them when the blower should be running.
If the HUM terminals are 120v then you need to get another transformer and hook up the primary side to the HUM terminals so it is powered only when the the blower is running. Hook the secondary side to the W/G and Cf terminals.
So bottom line is that you need to figure out what voltage your furnace is giving to the HUM terminals and then go from there. Some times the EAC terminals or the ACC terminals will be 24v on the furnace board. Either of them could be used also, as they are only energized when the blower is running also.

Heatman101

Jan 25, 2010 | Aprilaire 700 Humidifier

1 Answer

How does it work with an outdoor wood burner that's run into the furnace


If you are using a hot water coil and the blower from the furnace. The humidifier should turn on with the blower from the furnace.

Dec 14, 2009 | Aprilaire 550 Humidifier

1 Answer

Water only runs with humidistat in test/reset mode. Aprilaire 600 with an Aprilaire 56 Automatic Humidistat, both about 5 years old. Water line is clear, and test mode runs fine for the 1 minute interval....


you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1
10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%

Nov 28, 2009 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 700a flashers contact dealer light with a code of "E3". turned knob to test/reset and would come on as test, but wont work normally.


i believe e3 is an outdoor sensor problem, most people use manual mode, you should see a blue jumper that is connected to 2 OD terminals at the control, or if u use a sensor there should be a wire run outdoors, if you dont have the manual mode part you have to get it from an aprilaire dealer, cant just jump it out, it is a resistor80027be.jpg

Jul 21, 2009 | Aprilaire 700 Humidifier

1 Answer

Unable to get humidity level above 21% with Aprilaire 700A


Hopefully it was installed properly. It should only allow water to run when the furnaces blower is on. The outdoor probe can only be properly checked with an ohm meter. When you replace the evaporative panel, it is very important to have the dark painted mark on the "top" of the panel when it is installed. They do not give these instructions to a homeowner, only a contractor. So i am betting that your new water panel is installed upside down.
Good luck

Mar 26, 2009 | Aprilaire 700 Humidifier

2 Answers

Humidity too low


I corrected the problem...RH is rising nicely!! Installed by "professionals" on my Trane XV90....I redid their wiring and now have the following setup...

600A water supply coming from hot water line.
Removed orifice inside incoming feed tube.
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I also have it wired to run when ever the furnace blower is on. Heat or no heat. XV90 is variable speed, and by doing this the 600a is always adding moisture, until it reaches correct RH%

Also, I disconnected the outdoor temp sensor. I went to Radio Shack and bought a 47K ohm resistor ( 1/2 watt....4 pack for 99 cents). Installed that in place of outdoor sensor...now runs in manual mode. Have unit currently set to number 5.



Jan 14, 2009 | Aprilaire 600 Humidifier

1 Answer

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The max the aprilaire can put out is 45% Rh. Your humidifier may wired up to run only when the heat is on. In some cases this is not enough time to maintain your humidity level your seeking. To correct this, the hum. has to hooked up the hot side of the water supply. And the humidifier has to be hooked up when the fan runs and leave the fan run constantly

Jan 12, 2009 | Aprilaire 600 Humidifier

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