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Old 04-27-2011, 08:50 PM   #1
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Stove Vent Motor Speed Control

We've recently bought a 2011 27' FC. We like most everything about it with a few minor exceptions. One gripe is the noise generated by the vent over our stove. It has one speed, "wind tunnel", and it's difficult to have any conversation when it's on. As a result, we often use the Fantastic fan in the ceiling, because it's orders of magnitude quieter.

I'd like to be able to vary the speed of the vent motor so it's less noisy. I experimented with a small rheostat and it did work, but it's 3 watt rating was way too low for the motor.

My question, are there any electricians out there who could tell me roughly how much watt capacity, resistance I need? I'm guessing a 0-1k ohm range probably would do it. There's nothing in the vent manual, nor anywhere on the vent fan or vent housing that lists the wattage of the motor. So even an educated guess would be helpful.

Thanks for the help,

Paul
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Old 04-27-2011, 08:58 PM   #2
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There should be a label on the motor.
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Old 04-27-2011, 09:10 PM   #3
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You need to know how many amps the motor draws to select the proper switch for sure. A "motor-rated" fan speed control would be ideal if you can find one that will fit.
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Old 04-27-2011, 09:23 PM   #4
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I think you can do it electronically a direct wire module from X-10.com. The device is a remote Radio control variable speed type controller. I would just call them and they can help you find it. I have automated lighting but have never used that module.
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Old 04-27-2011, 10:01 PM   #5
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On second thought that is probably still a 12v d/c motor.
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Old 04-27-2011, 10:01 PM   #6
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If your fan draws less than 8 amps (almost surely) the following unit will work:

www.LEDwholesalers.com - PWM Dimming Controller For LED Lights or Ribbon, 12 Volt 8 Amp

- Bart
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Old 04-27-2011, 10:25 PM   #7
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This has long been an objection with stove hoods. The following resistor fix will halve the speed. [I haven't done this] Now if only I could get the smoke detector to be less sensitive...

Loud range hood fan
Help! Resistor on fan switch
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Old 04-28-2011, 01:21 AM   #8
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FYI, I tried looking for a label inside the hood and its components. I couldn't find anything with the info I need. It's Italian and maybe they don't label things like we do. I think I'll ping one of my "electronical-type" neighbors and see if he can tell me how to measure the amperage the motor's drawing when running.

There is plenty of room inside near the lamps to mount whatever I choose.

Bart's suggestion may be a winner. $12 ... it's worth a try ...

Thanks' everyone, for your help.

Paul
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Old 04-28-2011, 05:52 AM   #9
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On another thread I read that installing a 10 ohm 1/2 watt resistor works. I tried it yesterday and it does. Anything more than 10 ohms doesn't give enough oomph to open the vent flap. With the 10 ohm, it doesn't open all the way, but it seems to work fine. $0.99 for a pack of 5 at Radio Shack.

This worked on my '07, it's not the Italian fan.
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Old 04-28-2011, 07:26 AM   #10
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Go to Lowes and get a rheostat/dimmer for house lights. It will be more than enough to handle a 12 volt motor. But you can over engineer it if it makes you feel good.
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Old 04-29-2011, 11:21 AM   #11
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I was at a local hardware store yesterday and ran across a ceiling fan speed control rated at 5 amps. I know it's for 110 VAC, but I thought for $10, it would be worth a try. I'm going to wire it in this weekend and see what happens. I'll let you all know, assuming I don't fry my trailer. Stay tuned ....
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Old 04-29-2011, 12:29 PM   #12
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Silly question, but have you opened the outside vent flap? our fan is really noisey when its on and the vent flap is latched shut.
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Old 04-29-2011, 03:12 PM   #13
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Simply do a Google search on "12V Motor Speed Control" and you will find what you need. For example, check out: 12V 15A DC Motor Speed Control PWM HHO RC Controller: 003601-055 Virtual Village USA . Years ago, I installed a 12v motor speed control from New England Solar Electric and it has worked well at reducing the noise levels while still allowing the fan to extract as well as open the outside vent. Unfortunately, that company no longer sells what I installed.

Tim
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