Fan humidity switch doesn't install


I absolutely love easy, home-automating gadgets. I'm drawn to devices that offer convenience, energy-savings, affordability, and a simple cool factor. So when I saw a switch to control a bathroom fan, activated by humidity, I jumped at it.

Leviton Manufacturing liked my Ultimate Workshop Power Strip post where I had used their devices, so they sent me their Humidity Sensor and Fan Control to try out. I've always liked their stuff and really looked forward to this one.

Why? Here's my reasoning. Humidity is never a good thing in the house, right? Mold. Mildew. Bacteria. Fogged mirrors. Turning on a bathroom exhaust fan during a shower (especially a lobster-boiling, steaming-hot one like I enjoy) is a good
way to control it. Unfortunately, I'm often mid-shower when I remember to turn it on, leading to the classic soapy-headed, slip-'n-slide stumble to the switch (kids never turn it on). Later, when leaving the room, turning the fan off immediately leaves residual...

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If you just turn your bath fan on when you start a shower and off when you leave the room, it doesn’t run long enough to remove excess humidity. If you leave the fan running too long, you’ll waste energy.

A new fan control switch called DewStop solves both problems. It calculates when condensation will occur and turns the fan on and off automatically to keep the humidity at an acceptable level. This computerized switch is a vast improvement over the humidistats that have been around for years. You simply replace the switch or timer that controls the fan with the DewStop switch. It’s available online at or from online retailers. If you’re replacing a double switch that controls the fan and the light, order the version that includes a light...

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I was very excited when the fans arrived. They were well packed, looked like a good design. The fan body spun smoothly, and the fan shroud inside the body was smooth and had nice radiused edges. I was tempted to climb in the attic and install right away... Then the engineer in me decided to read the installation instructions. The installation instructions had a large WARNING section that had a list of things not to do. Most were expected, such as using gfci if installed over a tub/shower. However 2 items stood out :

#7 - Do not install this ventilating fan where air temp may exceed 40C (104F)
#13 - Not to be installed in a ceiling thermally insulated to a value greater than R40

So I called the manufacturer. Got a recording, but the nice lady on the recording did return my call the next day and I talked to a live person...

I live in NC, where last summer we had a week of 107F temps, which means that my attic temp was probably greater than 140F. The customer service...

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I am curious as to why I was never able to hit the 3GHz ceiling as well, I ran a stress test on the CPU and it never really provided over 2.2GHz, the stock clock.

I will try updating the BIOS tonight, though I am a bit leery and worried about doing so, because I had an Asus motherboard brick after a supposedly successful BIOS flash...

Aside from that, still looking for a definite solution to this problem... It runs incredibly hot when I am gaming, and it bugs me that I cannot go to high powered cooling or auto, for it is stuck on silent mode.....

I did not uninstall/reinstall energy management because Windows 8.1 was a fresh install from a DVD, meaning that no upgrading took...

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Hi Gordon,

That does sound strange, particularly that bit about the timer module not running long enough to clear the room – The maximum timer setting (turn all the way anti-clockwise) is 45 minutes and you can’t switch it off before the timer runs out unless you have a 3 pole fan isolator switch to remove the permanent live connection.

As for the humidity module, if you set it to its most sensitive (40% RH – turn all the way anti-clockwise) it should run nearly all the time depending on the relative humidity in your house. even if the humidity sensor wasn’t running, the timer function would run the fan on after you turn off the light.

It sounds very much like their could be a wiring issue. If you need the unit to operate in conjunction with your bathroom light switch, your electrician should have wired it exactly as per ‘Diagram A – iCON fan wiring for control modules with external switching’ in the instructions which shows how the bathroom pull-cord, lighting...

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It’s not practical and efficient to run the bathroom exhaust fan every time there isn’t the need for that. There is an easy and good way to save money. You can buy a secondary swith that will turn on the fan only when it’s needed.

Tools and materials that you’ll need:

electrical tape Phillips screwdriver flat screwdriver ladder drywall saw flashlight 2 feet of 14-2 romex 3 wire nuts


Step1. Ceiling opening

You need to cut an opening in the ceiling or wall, big enough for the fan to fit. The size should be 1.75 inches across by 3.5 inches up and down. The sides of the opening should be at about 1 inch from the fan cover.

Step2. Mounting

Open 2 of the wire entry points on the back of the box. You can now mount the box next to the exhaust fan.

Step3. power supply

Open the cover of the junction box that supplies power to the fan. Disconnect the supply wire from the fan. Route supply wires into the box you have...

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Which A/C fan setting costs more, “on” or “auto?” My friend believes the “auto” setting uses more electricity.

That’s actually a common, but important question. The on/auto fan switch on your A/C thermostat will affect the price you pay to cool your home. The A/C fan circulates the cooled or heated air throughout your home. Setting the fan switch to “on” will make the A/C fan run continuously, 24 hours a day. Choosing the “auto” setting will cause the fan to shut off with the rest of the cooling system as soon as your desired temperature on your thermostat is reached.

Fan “on” costs more
Advice from friends can be helpful, but in this case your friend was mistaken to think that the auto setting used more electricity. Let’s assume your air conditioner normally cycles off 30 percent of the time. In this example, turning the fan switch to “on” will make the fan run over 200 extra hours a month. For a typical size central air conditioner, that would cost you about...

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Delta Breez SMT130H Super Efficient Humidity Sensing Bath Fan - 130 CFM (replaces model VFB25AEH).

Perfectly Quiet - Perfectly Green!

Go green with the new Breez Ventilation Systems from Delta - the world's largest supply of DC brushless fans. The highly efficient DC brushless motor is part of the fan's innovative design, which consumes up to 65% less power and operates more quietly than other leading brands. Senses humidity and automatically turns on fan. The fan is programmed to run at variable speeds, based on humidity level. Fan cannot be used with a timer.

How does the humidity sensing feature work?
Humidity control mode: Turn ON the power switch to operate in variable speed humidity control mode. LED is ON - blue.
For humidity control mode, when humidity is above the set-point, fan runs at full speed (130 CFM). When humidity is below the set-point, the fan runs continuously at a user-preset lower level (0, 50, 70 , 90...

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Power your fan after dark

The Solar Controller without utilizing the house power option will provide the benefits of being able to monitor the attic temperature, attic humidity and attic fan operating status as well as providing the remote capability of controlling the thermal switch. Additionally, the remote of the Solar Controller allows you to monitor the Solar Attic Fan's operating status, the attic temperature and attic humidity, giving you the peace of mind it's operating as intended.

Addition of the Solar Controller with Dual Mode Technology will enable your Solar Powered Attic Fan to run after sunset, or when there is no light available from the sun.

When there is no sunlight available to power the fan, and the Solar Controller has the optional house power connection enabled, the Solar Controller will cycle house electricity for 8 minutes every half-hour in order to power the fan. This will allow your attic temperature to continue to...

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