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Lasko Ultra Cooler wiring help  Rate Topic 
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 Posted: Tue Oct 13th, 2020 11:14 pm
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Cameron Snyder
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I've lurked around the forums for a while, but decided it's finally time to post a fan of my own- a five blade Lasko Ultra Cooler purchased from ebay around 2 years ago.  It's an underestimation to say it was rough to begin with, but over the course of a couple months, it looks brand new (apart from the front control panel, which has been cut by a previous owner). It's now been sitting for over a year waiting to be rewired and used again. Before & After:







In restoring this fan, I had to remove the wiring to access all areas in order to paint them. The problem is, this fan had by far the most complicated wiring of any fan I've worked on, and as is I wish to add in a triac to make it variable speed (there was very little difference in speeds beforehand, plus a top of the line fan like this deserves one in my opinion). 

It gets even more complicated though- this fan came with a PSC motor which I want to keep due to its low power draw, but I have absolutely no clue how to wire it, even if to only spin in one direction. My goal is to wire it as reversible (like it was before), and to add in the triac for speed control. I also am unsure if the pilot light is rated for 120 volts, and the only feasible way I could see to test that is to run it on a variac to deduce its rated voltage.

As is I'm not currently able to work on the fan- college student after all- and can only provide information with the few pictures I have.




The motor has five wires, which through some research of PSC motors leads me to believe that one is common(?), one is for the start winding, one is for full speed, one is for low speed, and the last is unknown (possibly reverse?).
If anybody can help me to get this gem running again it would be greatly appreciated. As soon as I am able to work on it again, I will try to provide as many photos and as much information as possible. Besides the wiring, there are some more things I would like to fix on this fan before it is done, such as balancing the blade, but I will save those topics for later.


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 Posted: Wed Oct 14th, 2020 05:15 am
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David Northam
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WOW, it looks great! Nice job and great save!

I've not seen that model before. In fact, I think box fans with 5 metal blades are fairly uncommon. I hope some more of our box fan enthusiasts will see this post! I'm sure they'll be interested.

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 Posted: Fri Oct 16th, 2020 02:26 pm
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Tom Zapf
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i had one of those many years ago with the internal telescoping window mount and all the side pieces for filling in. you are right on your wiring you have a common and reversing wires, but do you have any speed controllers in the fan case? i think mine was 3 speeds each way ...5 wires doesnt seem like enough for 2 speeds reverse, i think 6 would be right without a speed controller in the box...

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 Posted: Sat Oct 17th, 2020 02:16 am
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Cameron Snyder
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The only speed control of any type was just the speed selector switch, could it be because it is a PSC motor and not shaded pole? If it was shaded pole I could see it having more wires, because if I am correct they need a separate winding for reverse (I don't think a PSC motor needs a separate reverse winding), and then separate speed windings. I would imagine the low speed on this motor is just the high speed winding coil tapped but I could be wrong. You don't happen to have any pictures of that fan, do you Tom? I'd love to see more of these fans, both the direct and belt drive versions.

Last edited on Sat Oct 17th, 2020 02:19 am by Cameron Snyder

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 Posted: Mon Oct 19th, 2020 01:28 pm
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Tom Zapf
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i dont have any pictures i mounted it in the window at my brothers house many years ago and they took it to their new house and i have no idea where it wound up...

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 Posted: Mon Oct 19th, 2020 06:06 pm
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John McComas
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I suggest you compare "images" on Google search for:  "3 speed psc fan motor reversible wiring diagram"
Happy Fanning!

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