Question about Honeywell HE440A1005 Humidifier

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Can a humidifier (either evaporative or steam) be installed in the return air duct to the hot air furnace, or must it be located on the outlet side? Thanks, Ned Mayo

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Evaporative should be in the return plenum and steam in the supply plenum.

Posted on Sep 27, 2010

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Can the humidifier's housing for a Honeywell model HE265 By-Pass Humidifier be installed on the return air duct, or must the housing for this model always be installed on the hot-air supply duct just above...


Hello Which came first the chicken or the egg?The unit will operate perfectly in the supply OR return as I have installed in both.If there is more room & easy service access put it in there.

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Our aprilaire humidifier is only 4 years old and it does not seem to be working. We have static in the house and when I did test mode it never drained water like it was supposed to. Any ideas what I can do...


Hope this helps, check and see if humidistat is set to 35% humidity and that bypass damper on humidifier is in the open position or winter position.(humidistat is usually located on cold air return duct near furnace). Next, replace humidifier media pad, remember to replace media pad (filter) annually, you also may want to clean any lime deposit out of humidifier housing with a solution of warm water and white vinegar before installing your new media filter.Remember to turn power off at side of furnace when cleaning humidifier and replacing media. Before installing new media turn power back on to furnace, set humidistat to the on position, turn furnace thermostat above room temp., and inspect humidifier to see if water is running from top,(you may want to have a bucket under humidifier when checking for water), if you see water running, turn power back off to furnace, properly install new media filter, reconnect humidifier cover & set humidistat to 35%. If you do not see water present, check water supply valve to humidifier and make sure its turned on. If water supply valve is open, then check water supply tubing for blockage.And the last things to check is to make sure all registers through out your home are open and not blocked by any objects, also make sure furnace filter is cleaned, if none of this works refer to installation manual to see if humidifier was sized and installed properly, Good luck.

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1 Answer

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Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.

Dec 28, 2009 | Honeywell HE260A1010 Whole House...

1 Answer

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it should not run while the fan on the furnace isnt running and if the humidity in the house is higher then the setting on the humidistat(HS). If he mounted the humidistat on the duct you need to make sure he cut a hole to allow the HS to sense whole house humidity thru the return air duct. if you turn the knob on the HS if you listen closly you should hear it click indictacting the humidity level as you raise the dail when you go above the indoor hum it will click and the humidifier should turn on and vise-versa. if it doesnt turn off /on when you hear the click then its wired wrong.

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1 Answer

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The humidifier is designed to "pull" the air through the water panel. After it does the humidified air will re-enter the plenum on the side of the opening that it is pulling in from. Just keep the water panel replaced every year and you will be fine.

Jan 26, 2009 | Humidifiers

1 Answer

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thanks for your question,
you have to install the bypass humidifier on the supply side of your heating system, (hot side) and run a bypass pipe from the return side, (cold side), it does matter which side it goes on, you do not want water vapor going directly into your furnace, as this can damage it and shorten the life of it, your humidistat is installed on the return side of your duct work, this will allow proper operation of the unit as the humidistat senses the moisture in the air and brings on and shuts down the humidifier as needed. hope that helped to answer your question, please let us know what you think, again thanks, mr.grzz

Jan 17, 2009 | Honeywell HE220A1019 Whole House...

1 Answer

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you are ok. this way humidity will get to whole house if your supply duct splits off. done this way often.

Dec 29, 2008 | Aprilaire 700 Humidifier

1 Answer

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You can try installing the water line to your hot water if it is installed on cold line for more humidification. You should make sure your humidistat is up line 6" @least from humidifier for proper humidification measurement.

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1 Answer

Motor turning real slow


THE MOTOR ONLY TURNS THE SPONGE DRUM AT MAYBE 10X'S PER MINUTE. THIS IS A BY-PASS TYPE HUMIDIFIER THAT RELIES ON YOU FURNACE BLOWER MOTOR TO SUPPLY AIR ACCROSS THE SPONGE MEDIA. NOTICE THE 5"-7" ROUND HOLE MUST BE DUCTED TO THE PLENUM OR RETURN AIR. (IF MOUNTED ON THE PLENUM, THE HOLE HAS TO BE DUCTED TO THE RETURN AIR, AND VISA-VERSA.) CAUTION!!!IF YOU HAVE CENTRAL AIR? A "DAMPER" MUST BE INSTALLED AND KEPT CLOSED THROUGH-OUT THE "COOLING SEASON". SERIOUS DAMAGE TO YOUR COMPRESSOR CAN RESULT FROM TOO COLD OF AIR ... CIRCULATING AND "BY-PASSING YOUR EVAPORATOR COIL".

Feb 13, 2007 | Honeywell HE120 Humidifier

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