Question about Dehumidifiers

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Humidifier in basement freezes up after several hours, ie coils are one big ice block. I have put it on a timer with 4 hours on 4 hours off. Seems to work OK. What causes this problem and is there a way to fix the unit itself?

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  • n437 May 17, 2009

    Thanks for the replys.

    I already checked and the unit is not clogged, it's actually pretty clean whoch was a surprise.

    I originally suspected the basement was too cold, it's usually about 60 (+/- 5), but no one expersseed that as a concern.

    Assuming it is low refrigerant, I have some R12 (from by-gone days and gagues. Do these units R12 and what would be the upper and lower pressures to charge to?

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Hi there, Yes this problem has been asked before by other users, Firstly, there are several things to look for be you go crazy calling in a technician,
1. check the systems coils and make sure that they are not blocked with either , dirt or dust preventing the air flow or make sure the condenser fan is operating ,if both these things are clear or operating when the compressor starts then the system could be under charged or leaking in which case a technician would be advisable unless you understand and or have the necessary tools to carry out  its repair. The only other thing that could be causing it is , if the humidi-thermostat is faulty and is causing to stay on too long (with could be why the system appears to work properly if you turn it off once and a while ) 
I hope this information helps you..
Also, Please remember if you feel like opening the machine up to check the can if its not running, make sure that the machine is totally un-plugged from the power supply to prevent any chance of electric shock , please be safe :)

Posted on May 17, 2009

  • Paul G
    Paul G May 18, 2009

    Hi , Yes if thats 60 Dg Fahrenheit (15.5 C) it can be a problem cause of the lack of heat the humidifier will be over condensing which will cause that too , (wish you would of mentioned that ) ,
    best thing is to ventilate the area or move the system, 


    Thanks 


    Roadrunning1 

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Problem could be caused by lack of air flow (dirty coils and/or filter) or by low refrigerant (not worth repairing).

Posted on May 17, 2009

  • HANK MCNEIL May 17, 2009

    The unit rating plate should list the type of refrigerant. No, it's probably not R12. It probably does not have access ports. The pressures will vary due to ambient, and refrigerant. It is probably not worth having it repaired especially since any repairs would probably be temporary at best. I think you've already found the best solution/fix.

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1 Answer

Just purchased this product and we are having difficulty figuring out the best setting so that the unit will shut off and on. It seems to only run continious. The model no. is VK0025000CURNPF735A0794 ...


When a humidifier is first placed into service depending on the environment you placed it in, it can take up to a week to actually shut off.
Think about this...
Q? Why did you buy the unit in the first place?
Ans. Area you want to use it in is damp.

So the NEW humidifier has to really work hard to remove moisture from everything in the space.
Furiniture, structure to include cement floors and walls. This can take a very very long time initially. If there is a sump pump in the basement the humidifier needs to be placed quite a distance from the sump area. If the structure foundation and walls are allowing water seepage into the basement it may NEVER shut off.

If it does not shut off after several days. Move the unit to a small room upstairs that you can place it in and close the door just to test to see if the unit will cycle on and off. If it cycles on and off in a small room you may want to inspect your basement foundation and check for plumbing problems.

Thanks for choosing FixYa,
Kelly

May 22, 2011 | Whirlpool 25-Pint Dehumidifier

1 Answer

Danby dehumidifier ddr4588ee ices up. Humidifier located in basement with temp around 60degrees. Unit is 1 1/2 years old.


According to your Owners Manual, the coils may start to frost at 60 degrees and the defrost sensor should turn ON and cycle periodically. However, the air temperature at the floor level in a basement, is colder than the air temperature by 5 to 8 degrees. So this may be causing the problem. In addition, if the air intake filter is dirty or clogged, the unit has to strain to keep up and will not function as it should.

If the unit is totally iced up, turn the unit Off and unplug it from the wall outlet. Allow is to thaw completely before attempting to clean the filter. You may want to put some old towels under it while it thaws. Once it's thawed, move it to a bathroom that has a shower. Plug it it in and set the humidity level at 45%. Turn the shower ON at a Medium hot temperature (enough to generate steam) and as you exit the batroom, close the door. DO NOT operate the bathroom's exhaust fan. Allow the unit to operate for 15 to 20 minutes, before returning to the bathroom. Then turn the shower OFF and check the unit for any frost and the amount of water collected in the bucket. If there is no frost on the unit and there's water in the bucket the unit is operating properly.

When you move it back to the basement, place it up off the floor on something sturdy, that can hold the weight and not be bothered by the vibration of the unit, when it's running. (ie a work bench, a counter top, etc.) Operate the unit as you normally do and monitor it for frost or icing up. And, whether or not the defrost sensor is cycling as it should. If you get no frost or just minor frost, it was the air temperature at the floor level, that was causing the problem.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

May 18, 2011 | Danby DDR4588EE Dehumidifier

1 Answer

The coils freeze up after less than a half hour of running. It does not matter what humidity setting I use or if I select the 2 hour or 4 hour run cycle. B/c the coils are freezing up, the dehumidifier...


the coils freeze up for one of two reasons .. if air flow is blocked .. sometimes by dust buildup or fan bearings needing lube .. second if the fan is working properly then ice buildup can be caused by low refrigerant levels .. the proper charge produces a steady coolness across the entire evaporator (cold coil) .. as the level drops it tends to cool a small part of the evaporator way too cold .. that creates ice .. the ice blocks the air flow and soon the whole thing is blocked ...so check the fan first .. if its running properly and there is nothing blocking air flow then suspect low refrigerant.. that requires adding a saddle valve service port to the system to allow adding refrigerant .. often the problem is caused by the fan not working at all because of lack of lube in the bearings or a bad starting capacitor ..

Aug 15, 2010 | Goldstar DH504EL Dehumidifier

1 Answer

Iced over


I thnk you are expecting too much from your machine. DO NOT RUN IT WHEN IT IS FROZEN!

This is what I would do. Slow down the process. You shuld be agle to select the % humidity you seek. Set it high, say 90. Get another fan in your basement working to sirculate the air. When your machine has achieved this goal without excessive running and freezing, go to 85% or 80%. It may help if you direct a small fan at the coil that freezes.

Are you certain your machine drains properly? Hose to a sump pump? Is the sump pumping properly?

And lastly, you may want to add a second machine. I operate two in my basement and they keep it 50% in the summer. My basement is about 4000 cubic feet.

I hope this helps you

a

Sep 27, 2009 | Dehumidifiers

1 Answer

Dehumidifier problem


First, make sure the rectangular filter on the back side is clean so air can flow over the coils freely. Try to place the dehumidifier on a table or something to get it off the floor. (floor level is cooler than head level) If you still have icing issues, replace sensor. (part # WK23X10011 )

Sep 01, 2008 | Dehumidifiers

1 Answer

Dehumidifier freezes up


Most dehumidifiers need warmer air to work properly. The temperature in a basement is usually 60 - 65F; too cool for standard models. You could buy a "basement" dehumidifier. They're designed to work at lower temperatures; some as low as 40 F. Costs are about the same as a standard dehumidifier; you just have to find it.

For a cheap fix, try this; it seems to be working for me.

Since the condensate coil (the one icing up) is cold, the air entering it is too cool and the condensate frosts up the coil. Additional condensate freezes to the frost and before you know it, you've got a block of ice. Since the air coming out of the front is very warm take a large piece of cardboard around 6' x 3') and form a V. Placed it in front of the dehumidifier so it channels some of the warm air back to the rear where it warms the moist air up before it hits the cooling fins. It's helped keep the ice down.

If you want something attractive, any screen that redirects some of the air back to the rear will work. Just leave the top open so it doesn't get too hot and the some of the drier air gets out into the room.

Jul 02, 2008 | GE AHG40LJ Dehumidifier

2 Answers

Humidifier is freezing up


I have the same dehumidifier and it does the same thing. but I was able to fix mine. It was not low on refridgerant. There is a temp. sensor clamped to the evaporater coil with a thin metal clip. The clip rusted out and the sensor fell out of position. I used a small stainless steel hose clamp and clamped the sensor back into position. It now works fine

Apr 10, 2008 | Fedders A7DH45B2A Dehumidifier

1 Answer

Iced up coils and will not dehumidify


I did a little digging around on the internet and found out that if the basement (or where ever you have your unit) is in an area where the room temp might dip below 65 degrees the coils may start to become "too efficient" in pulling the moisture/humidity out of the air and it begins to freeze on the coils before it can drip off into the reservoir. The site said to turn off the unit and let it thaw out, then restart it and see if everything works ok after that. If the temperature gets too low you might need to warm up the air in the room/basement before it will operate correctly again/not continue to freeze up. Hope this helps. Mine just did the same thing but we've had some pretty cold weather recently and the basement is fairly cold as well.

Jan 20, 2008 | Comfort-Aire BHD-501 Dehumidifier

1 Answer

Humidifier coils freeze


I believe a dehumidifier is supposed to operate in temps above 60 degrees. Even though your house is warmer than that, the air entering the dehimidifier may be getting into that range due to it being on a basement level etc. This is perfectly normal and is not a malfunction with your humidifier.

Your options are to either place the dehumidifier closer to a heat source in order to keep the air which is entering warmer. (I've even heard of someone placing a light bulb in front the unit during winter to warm the air slightly as it enters). Because the dehumidifier's coils get cold in order for it to collect moisture from the air, if they are freezing, giving the unit a rest for a few hours every few hours may allow the coils to thaw in between and prevent them from reaching freezing temperatures while running. You could use a timer to accomplish this, but you'll want to insure that it's a commercial grade timer in order to handle the electrical draw that the dehumidifier requires.

Dec 29, 2007 | Eva-Dry EDV300 Dehumidifier

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