Question about Aprilaire 600 Humidifier

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Aprilaire 600 with outdoor senser, knocks when on stops when humidistat is turned to off. Has Aprilaire had any problem with there humidistats? I've checked all connections.

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  • Lou Barta May 11, 2010

    Need more info. Discribe the knock. Does it only knock once when it starts or does it repeadly keep knocking while it is running?

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  • 232 Answers

If the wire to the outdoor sensor runs close to high voltage wiring it may cause that

Posted on Sep 13, 2009

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Aprilaire Humidifier Model 600 squeals shortly after being turned on


I have seen some humidifiers do this becuase of high water pressure. Try closing and opening the saddle valve and see if it helps at all.

Nov 28, 2012 | Aprilaire 600 Humidifier

1 Answer

I have a aprilaire 600A I have hooked it all up but for some reason the number display doesnt show anything. The controls all light up, but no display. Also for some reason no water is coming out.


Thank you for contacting us. Does your humidistat have a blower activation switch on the lower left hand side of the humidistat? If you do it is our #60 humidistat, and if it is not there you have a #58 humidistat. The R & C are the two connections that supply power to the humidistat to give you the numbers on the digital display. The 60 you wire right into the R & C off the furnace panel. The 58 you need a constant 24 volt and 10 VA power source which you could get by using the transformer off a constant 120 volt power source to power the humidstat. If you are doing this correctly and you still do not get the numbers to show up, then you have a bad humidistat and you need to go back to where you purchased it from and exchange it under warranty provided you used a certified HVAC contractor to do the installation. Our warranty is only valid if you used a certified HVAC contractor to do the installation. If you have any additional questions please contact us at 800-334-6011.

Thank you

www.aprilaire.com

Kevin Engen
Customer Service
Research Products Corporation

Nov 09, 2010 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 600 problem


It sounds like you got it...

The solenoid will not open with only 13 volts to it. Jump or apply the full 24-27 volts to the solenoid and see if it clicks and opens and allows water to flow.

If the valve still won't open or pass water, start looking for a plugged inlet solenoid inlet screen or a faulty solenoid valve as well as a faulty humidistat.

Jan 06, 2010 | Aprilaire 600 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

I have a manual control and I want to upgrade to automatic control. What do I need and how expensive can be(parts & labor)?


If I'm not mistaken, the 600 has a automatic or manual control built in to the same humidistat. The only thing required is the outside air sensor (oas) be mounted outside and wired into the humidistat. Don't forget to remove the "manual" jumper from the humidistat.

Oct 03, 2009 | Aprilaire 600 Humidifier

1 Answer

Keep running


You should have a #50 relay hooked up to the main blower assembley to turn the 24 volts on and off with the blower to the humidistat. Alot of humidifiers sold do not tell you about the #50 relay. They assume that you are a hvac pro and you aready know about.
Good luck
HVAC Teacher

Mar 02, 2009 | Aprilaire 600 Humidifier

1 Answer

Solenoid won't open--voltage drops when connected to humidistat


The coil may shorting out the 24vac supply to the solenoid. Recommend replacing soleniod.
Normally you should be able to read the 24vac across the solenoid when energized.
The other option is to get a 120vac to 24vac transformer and test the solenoid. This way you will know if the solenoid is the cause or the 24vac source is the problem.

Feb 22, 2009 | Aprilaire 600 Humidifier

1 Answer

Not getting enough humidity in the air


There are 3 things to check on the humidifier. Check the metal mesh screen, is it wet after the humidistat is call? If it is dry the water solenoid my not be opening or the nozzle is plugged. The circulating fan blows air through the wet screen to add humidity. Does the fan spin when the humidistat is calling? There is an intake and exhaust on the humidifier. Check that the metal was cut out properly when the humidifier was installed to allow air to feely circulate?

Mar 06, 2007 | Aprilaire 600 Humidifier

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