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Aprilaire 760 w/ Auto-Trac quit

This unit has been operational for about 6 years and suddenly quit, not even operational on TEST. There is a 25 v current at the power terminals and the resistance on the Auto-Trac wires is at ~31,500 ohms @ 33 degree outside temp. Voltage at the connectors leading to the unit itself are negligible (~1.3V) whether the switch is off or on Test and the unit is plugged in! The switch always gave a click when it engaged before, but there is no indication of such now. My suspicion is that the humidistat itself is defective, but I'd like to know if there are some additional tests to check that out.

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  • dbuelke Feb 15, 2008

    Figured it out. There are two wires powering the control w/ 24v and there are two that connect to the outside thermistor to equilibrate outside temperature with the desired humidity inside. The other two (labeled H or A/A) are the contacts for the humidistat switch. Check the continuity across those two terminals and if it's open on TEST, replace the humidistat.

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Have you changed the pad and cleaned it out ?

Posted on Feb 24, 2010

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1 Answer

Aprilaire 760 keeps running


Is this a newly installed unit it sounds as if there's a wiring issue. Could you show a picture of the wiring terminals. If this is not a new install try turning of your furnace fan.

Nov 02, 2014 | Aprilaire 700 Humidifier

1 Answer

Model 760 Aprilaire makes a loud noise when running. It almost sounds like the blade is hitting something. Its 10 years old !! I built the house so if you can tell me for sure what it is I'm sure I can fix...


I think you're on the rate track. If it's ten years old the blade and.or the shaft may be worn out. Turn off the water line feeding the humidifier.Turn off the electricity to the unit. Drain the tank, open he tank cover and try spinning the blades with your hand. That way you can tell and see what its rubbing against and if it can be repaired. But, if it's 10 years old, parts may not still be available for that specific model.

Good luck. Hope that helps.

Feb 11, 2011 | 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

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

2 Answers

Water is leaking from the bottom of the unit


The tune up kit that I ordered arrived on Friday and I installed most of it on Friday night. While it is nice to have a new frame and the distribution panel and I think the price of the whole kit was fair considering it comes with the parts and 2 water panels, the fix was really simple.

The kit came with the water distribution tube with with a new blue orifice (Aprilaire #4232) already inserted. This orifice is in the end of the plastic tube at the solenoid end. When I removed the old water distribution tube, the old orifice was not really dark blue anymore but kind of a light blue and was deteriorating from 12 years of exposure to the chemicals in the water. What should have been a pin-hole size opening in the orifice was up to about 2mm or a little more so the orifice was letting way too much water through.

If anyone else has this leaking problem, and your orifice is several years old, I would check that first. It is a $2.75 part and may be the cause of the leak. The whole feed tube kit is only $8.75 and includes the feed tube, nozzle, orifice, ferule, compression nut, strainer so if you need to replace the orifice, I would order the whole feed tube kit for a little bit more.

Hope this helps,
Roger...

Jan 17, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 760 humidifier. no power to humidastat


the 760 send power out the humidistat is just a switch if you touch the two brown wire coming outof the 760 the humidifier should come on if it doesnt and you had appiled power to those wire you probably shorted the 760 control board

Jan 15, 2009 | Aprilaire Humidifiers

1 Answer

Aprilaire model 760


It could be that the humidistat is not calling for humidity. Make sure that you have the dial turned up all the way (as far as it will go, just to test it) and that the blower on the furnace is running - if the unit is properly wired, the water will not run unless the blower on the furnace is running. This should do the trick. If not, the only other thing would be a bad humidistat. Good Luck!

Dec 14, 2008 | Aprilaire 550 Humidifier

1 Answer

Water does not stop.


soliniod may be stuck. you will need a volt meter to test

Dec 13, 2008 | Aprilaire 700 Humidifier

2 Answers

Aprilaire 600 Humidifier


J-

I had this problem several years ago. In order for the water to flow, the outside temperature sending unit must indicate to the controller that it is less than 60F. If not, the unit will not operate outside of test mode. Check the temp outside where your sending unit is (could the sun be heating that side of the house?) and ensure that the circuit to the sending unit is working. I had a bad wire splice inside a wire nut stopping the circuit. Took me a long while to figure it out.

If the outside temp and your sending unit circuit is ok, I wish you luck on your troubleshooting.

adx_98

Nov 10, 2008 | Aprilaire 600 Humidifier

3 Answers

Aprilaire 600 - change water panel light stays on


Turn the control knob to the test/reset position untill the change water panel light blinks to reset the change panel timer. Make shure the furnace is running calling for heat.Turn control knob to prior setting after resetting timer. Hope this helps.

Feb 16, 2008 | Aprilaire 600 Humidifier

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