If you were going to run an AC fan motor, it would be best to wire it for 240 volts off the generator so your pulling off both legs equally. Wal, if you need to restrict airflow to load the motor, you either have too large a motor, or too small of a fan/blower housing. If its a belt drive you can often change pulley sizes to speed up or slow down the fan to get the motor close to full load,but the most efficient is always going to be a direct drive "if" its loaded properly. Clifford has mentioned a few times seeing an MCI with the rad blowers replaced with one of the AirCon blower motors. I recall a while back a few comments that the rad fans were drawing some 50 HP off the engine, based primarily on the size of the belt. I believe it might only have a belt that size more for durability than that it actually took 50 HP to run the blowers. The rad blowers don't look to be any larger than the AC fans. Ive seen some large HP squirrel cage fans, for example a 20 HP squirrel cage fan is BIG. lol. A 50 HP one would likely fill the entire engine bay of most any Bus.
Good for you Wayne now just be sure you have a switch to control it for winter time use good luck
If you were going to run an AC fan motor, it would be best to wire it for 240 volts off the generator so your pulling off both legs equally.Wal, if you need to restrict airflow to load the motor, you either have too large a motor, or too small of a fan/blower housing. If its a belt drive you can often change pulley sizes to speed up or slow down the fan to get the motor close to full load,but the most efficient is always going to be a direct drive "if" its loaded properly. Clifford has mentioned a few times seeing an MCI with the rad blowers replaced with one of the AirCon blower motors. I recall a while back a few comments that the rad fans were drawing some 50 HP off the engine, based primarily on the size of the belt. I believe it might only have a belt that size more for durability than that it actually took 50 HP to run the blowers. The rad blowers dont look to be any larger than the AC fans. Ive seen some large HP squirrel cage fans, for example a 20 HP squirrel cage fan is BIG. lol. A 50 HP one would likely fill the entire engine bay of most any Bus.
Quote from: luvrbus on August 03, 2011, 06:28:57 AMGood for you Wayne now just be sure you have a switch to control it for winter time use good luckHello CLifford, It didn't come with a switch and I am certainly no electrical guru. There is a blue red and black wire. The guy told me to use the black in some and red or blue in the winter, that it changes the speed of the motor.
Are you coming to the Texas rally? If you are maybe we can take a minute to look at it. When it comes to electricity you could have written that in chinese and I would probably recieved the same amount information in my head. Once I get it, I got it, but I still got to to get it.
Quote from: wal1809 on August 03, 2011, 10:51:59 AMAre you coming to the Texas rally? If you are maybe we can take a minute to look at it. When it comes to electricity you could have written that in chinese and I would probably recieved the same amount information in my head. Once I get it, I got it, but I still got to to get it. I didnt mean to insinuate that I had AC blower fans, my bus is currently a stripped shell, but completely stock including the road air/heat, radiator blower, etc., awaiting the master plan. We had two kids weddings this year, and now my Dads health is giving us trouble, and its been HOT. Im still a Yankee, and 110 degrees every day makes me want to stay in the house, lol. I have a lot of ideas about what I want to do, but money and time are a bit scarce. What we are saying about balanced loads refers to the generator. Most generators in RV's are putting out 120 volts on a single leg, or black (hot) wire. Some generators have whats called a 12 wire head, and can be re configurated to put out several different voltages as well as 3 phase. They can be configigured to put out 240 volts on two legs, so you can have an electrical panel like you have in your house. That allows you to connect 120 loads and 240 loads in the same panel. However, the loads on the generator should be closely balanced between the two legs. As you start drawing more power off one leg, the generator starts running hot. And heat is its enemy. All 240 volt loads would by their nature be balanced and not present any problem. The problem would arise from operating too many 120 volt loads on one leg. Most electric motors can be configured to operate on either 120 or 240 volts, but are more efficient on 240 volts. The biggest issue im considering is that most campgrounds only have 120 volt 30 amp outlets, and 240 volt motors or appliances will be useless in that situation.
Now, lest we forget: The generator cooling fan would only be needed when the genny is running and if the genny is running we will have the 220VAC. I couldn't resist....where is self control when we need it. Thanks Art. John