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R&M B-2500 18 inch window fan  Rate Topic 
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 Posted: Sun May 30th, 2021 03:59 am
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Michael Poule
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I want to replace the capacitor in my R&M window fan... Does anyone know what the value is for these caps? I guess it is probably printed on the side of the cap, but the black insulating wrap doesn't want to come off. 
R&M B-2500 model, series C.






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 Posted: Sun Jun 6th, 2021 05:00 pm
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Michael Poule
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Hi all, I found this picture in the archives. It's a capacitor in a Hunter Zephair B2500. Rated @ 3 mfd. Would it be safe to assume that the cap in my R&M B2500 is also 3 mfd.... The only difference I see is the Hunter is series D, my R&M is series C. I'd really like to replace the cap, but want to be sure it is the correct value. It is a great fan & has sentimental value, my Grandparents. Thanks.

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 Posted: Sun Jun 6th, 2021 09:16 pm
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Rob Duffy
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Michael Poule wrote: Hi all, I found this picture in the archives. It's a capacitor in a Hunter Zephair B2500. Rated @ 3 mfd. Would it be safe to assume that the cap in my R&M B2500 is also 3 mfd.... The only difference I see is the Hunter is series D, my R&M is series C. I'd really like to replace the cap, but want to be sure it is the correct value. It is a great fan & has sentimental value, my Grandparents. Thanks.
The capacitor value is likely the same. There were some design changes over the years but the motor remained the same for quite a number of years. Make sure you use a motor "run" capacitor and not a "start" capacitor. Also some oil in the front and rear bearings. These motors don't like to be run that hard.


And lastly, when using a window fan for it's proper function, you need an air exchange window open, preferably opposite of where the fan will be used in a different room so that you don't attempt to pull a vacuum. You'll burn out the motor if the fan can't push or pull air from the outside.

Last edited on Sun Jun 6th, 2021 09:19 pm by Rob Duffy

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 Posted: Mon Jun 7th, 2021 12:11 am
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Michael Poule
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Thanks Rob! I Appreciate your response. 
I have kept it well oiled over the years, but it seems to be running hotter than it used to. Thought it was time to replace the original (60+/- year old) cap, before it can cause any damage.
 

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 Posted: Mon Jun 7th, 2021 12:32 am
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Rob Duffy
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Michael Poule wrote: Thanks Rob! I Appreciate your response. 
I have kept it well oiled over the years, but it seems to be running hotter than it used to. Thought it was time to replace the original (60+/- year old) cap, before it can cause any damage.
 
These motors do run hot. I used the 18" Zephair I have for a number of years and noticed that the motor can get quite toasty. The best you can do other than keeping it well oiled and replacing the cap is just to make sure the fan has enough air flow from an exchange window. Typically two additional windows not including the one that the fan is in would be a safe bet. Any time I ever run the window fan here, I make sure that at least two bedroom windows are open (with the fan on exhaust in the livingroom window)

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 Posted: Mon Jun 7th, 2021 02:36 am
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Michael Poule
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This is the new replacement cap. Thoughts on Titan Pro brand? Good? Bad? Ok? Hoping it lasts for awhile. 

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