| Re: Electric Radiator Fans: Practical cooling from the mens mall to your coach! Part II [message #90801 is a reply to message #90798] |
Fri, 02 July 2010 07:28   |
hertfordnc
Messages: 1164
Registered: September 2009
Location: East NC
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I started a thread on this topic a while back and I plan to install an electric fan as i put my engine back together so i am very interested;
Why is it necessary to have a variable speed controller?
You have two fans with two speeds so that's four levels of airflow available.
Does it really matter to the fan if it gets switched on and off abruptly? I don't think so.
For myself I'm planning to try just one fan (Revcon is lighter, roads are flat)
I have the same big Siemens fan from a Ford.
I'll put the low speed to the dash air and the high speed to an adjustable temp switch and see what happens.
I was thinking that if i added a second fan I would control them with temp sensors in different parts of the cooling system;
Like the first fan comes on low when the heat near he intake reaches a specified temperature. Other sensors sensors elsewhere in the cooling system would add airflow in steps, maybe the last one being on the radiator.
That seems simpler to me than counting on a variable speed controller.
Or, assuming that in real world operation this system will not go to max very often, what if you had a an override with a relay that bypassed the controller when the radiator temp got too high.
So your controller takes both fans up to the point where it's drawing 45 amps and if it goes past that a separate sensor engages a relay to put fuller power to both fans and drop out the controller.
Look forward to hearing your thoughts.
Dave & Ellen Silva
Hertford, NC
76 Birchaven, 1-ton and other stuff
Currently planning the Great american Road Trip Summer 2021
It's gonna take a lot of Adderall to get this thing right.
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