| Re: Electric Radiator Fans: Practical cooling from the mens mall to your coach! Part II [message #90853 is a reply to message #90801] |
Fri, 02 July 2010 13:59   |
|
|
Well actually the controller will pull 60 amps, but I read its rated for only 45, means im 15 amps over. Flexalite mant it to be used with their fans, which are just a tad smaller then what im running 
The reason I went with the VSC was because of the soft start and throtteling the fans from 60% to 100% based on temp of the coolant. so most of the time my controller is pulling its rated load, but its under 100% duty cycle usage that im concerned about, so I will put the lower fan which covers the trans cooler a relay to take the load off the controller which will allow worry free 100% operation, so only one fan will be 100% all the time when on the other will be governed as needed.
As for just using one fan on a revcon I dont see why that couldnt work. when I first wired up this system I only had 1 fan installed, and while it did take longer about 2 minutes to bring down the temp to where it would shut off, it did cool the coach under normal operating. I added the second fan because I believe that more is still infact, more! and the capacity to move up to 8,600 CFM should keep my rigs temps down under the most demanding of conditions.
Sofar for fans, parts and conroller, as well as alterntor upgrade using mens mall parts has kept expenses low for this project. keep in mind that unless the AC is on the fans will be off most of the tme and during highway cruise they shouldnt come on at all!
| hertfordnc wrote on Fri, 02 July 2010 07:28 |
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.
|
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
