Question about Aprilaire 700 Humidifier
When I plugged the unit in this season, it will not start when furnace kicks on. What is the proper sequence for testing? Most likely cause? Unit is around 4-5 years old.
SOURCE: 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
Posted on Dec 28, 2007
I have had the same problem , off and on, on my two 700 units for over 4 years. It is caused by water hammer which results when a water solenoid valve closes quickly under pressure. Refer to your owners manual or get a copy of it off the internet. Note the areas where they tell you to remove and clean the inline water strainer and the inline orifice restrictor. These are VERY small components and can clog up easily so they need to be cleaned per the manual. While cleaning them won't totally eliminate the problem it has helped mine with the noise. You really need to have a qualified person, like a plumber, install a small, water hammer arrestor in the inlet line. The trick is to be sure it ends up parallel to the water line flow and not perpendicular to it.... a common mistake. If you are not qualified to work on solenoids and piping, don't do it......it will end up costing you more to repair your mistakes. Good luck
Posted on Jan 15, 2008
reason why I asked they sometimes have a problem sensing current and you may need to wind the wire twice instead of one pass. If you jump the wires at the humidistat and the unit turns on its either the stat or you may want to do a relative humidity check on the house to see where your at
Posted on Dec 16, 2009
if it works in the test mode then it should be okay but you can get a humidity gauge from radio shack and set in the house to see how high or low its is. the humidifier is only going to give a max of 45% humidity
Posted on Dec 31, 2009
sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W
Posted on Jan 13, 2010
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