Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-18-2018, 09:03 PM   #1
3 Rivet Member
 
1990 29' Excella
baltimore , Maryland
Join Date: Jan 2015
Posts: 183
Furnace blower motor RPMs modified... is faster ok?

CALLING ALL MECHANICAL ENGINEERS !!!


I found a form - fit - function replacement blower motor for my Suburban NT-30k furnace. (original no longer avail)

All except the rpms. The new one is 33% faster. I thought that this would be fine, but now I am thinking the fire box running cooler could cause water vapor to not be totally ejected from the fire box?

I have read about corrosive problems that need special design considerations in high efficiency furnaces.
Would these things happen in my case?

Am I thinking correctly or worrying too much?
I dont want to have a rusted hole in the firebox halfway through the winter.

Thanks.
gh
groundhogy is offline   Reply With Quote
Old 10-18-2018, 09:26 PM   #2
Retired.
 
Currently Looking...
. , At Large
Join Date: Jun 2003
Posts: 21,276
A resistor will slow the motor down, as will a potentiometer. Reducing voltage to reduce motor speed is an accepted method. Just make sure the method used is rated for the current used.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 10-18-2018, 09:49 PM   #3
3 Rivet Member
 
1990 29' Excella
baltimore , Maryland
Join Date: Jan 2015
Posts: 183
Yes, I think reducing the RPMs is the best solution too.


Going to need several power resistors. Have to drop 4 volts and 60 watts to get supply voltage and RPMs down by 33%. That is if Vsupply and RPMs are linear.
groundhogy is offline   Reply With Quote
Old 10-18-2018, 11:34 PM   #4
Rivet Master

 
2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 9,180
A more efficient way would be a PWM adjustable speed control.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
rmkrum is offline   Reply With Quote
Old 10-18-2018, 11:54 PM   #5
3 Rivet Member
 
1990 29' Excella
baltimore , Maryland
Join Date: Jan 2015
Posts: 183
Yes, I have heard about using PWM.

What would this circuit look like?
Its got to take some heat.
groundhogy is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How do you set RPMs on Onan 2800QG rowiebowie Generators & Solar Power 14 09-16-2018 08:37 AM
selling AO Smith 105 motor to replace original Armstrong blower motor eubank Furnaces, Heaters, Fireplaces & Air Conditioning 1 09-07-2010 10:09 AM
Max RPMs for a 302? Boondocker Tow Vehicles 22 07-30-2007 07:26 AM
Rated tire speed - Can I get faster than 62? Goin camping Tires 1 09-25-2006 05:29 AM
Faster than a Telegraph! autoist Airstream Motorhome Forums 0 02-26-2003 09:32 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 04:12 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.