Question about Intertherm P3RA-048K Air Conditioner

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Blower speed i have a intertherm electric furnace with a 3 speed blower with central air also i was looking at the wiring it is only set on med low speed is ther any way to switch it to med hi it does not blow hard anough in the summer thanks

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  • Ken Bledsoe May 11, 2010

    Do you have a circuit board or do you have a fan center? You have to take off the cover of the air handler unit to see the board and it is located on the bottom right in front of the fan compartment.

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Yes usually the black is high speed, the blue is low and red medium speed. plug the black wire from the fan motor to where the blue wire is, then put the blue where the black wire was

Posted on Jan 10, 2009

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I have a Lennox Diplomat furnace. How can I tell if the blower motor is set for high speed when it comes on?


The only way to really tell if the blower is set to high is to look at the control board inside the furnace and see how it is hooked up. You will have either a 3 speed or 4 speed blower motor, more than likely a 4. These are Hi, Med Hi, Med Low, Low. Each speed has its own color and if the motor has ever been changed, it could be different from factory diagrams. The most common colors/speeds are:

Black- Hi
Blue- Med Hi
Orange- Med Low
Red- Low

You could have different colors but they will be close. If it's an aftermarket motor, the speeds will be listed on the motor itself, but very difficult to get to sometimes. On the board, you should have terminals marked, COOL, HEAT, PARK, PARK. You hook what speed you want for Cool and Heat and put the other 1 or 2 wires on Park.

Again, these might not be exact, but these are the basics and they usually don't deviate from them to much unless it's a 95% furnace or such. If you do have the diagram for the furnace, you will be able to find everything with no problem now that you have the basics. Also keep in mind that you will have a Common wire from the motor that hooks to Com. terminals on the board. Hope this helps and good look!

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I have an Emerson (4 Speed) direct drive blower for my gas furnace. What is the process (wire color codes) to change speeds on the blower. (I have a red, black and yellow wires taped off in the wire...


There should be a wiring diagram on the motor itself. The colors of the wires vary depending on voltage and model. Generally you have a med/low and med/high setting, I'm not sure what you are getting to with the low/high setting unless you are trying to set up staging. Check the motor for a diagram, if that is not present post back with all of the wire colors coming from the motor and the voltage.

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Go to the blower motor find 3 wires.Black is high,blue is med, red is slow. Find what wire is on blower relay. then adjust to what you what. hope this helps.

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1 Answer

Do you know of a way to slow down the LOW speed fan setting on a Kelvinator KSE70HRA air conditioner? Low is very noisy and blows air like a HIGH setting.


Hi, no, im sorry if it is on low already, it can't be changed to go any lower. The only thing I can come up with is the fan motored is wired wrong, and they have the high or med lead connected to the low speed, as it should run slow. On a central air system, there is a board that is in the indoor unit that shows the fan speeds, and they can be changed.I didnt look up your unit, and if it is a central air and not a window unit, you can change the speeds at the board. The wires are colored, blue is normally low, red is Hi, and blk or yellow is med. If this is a window unit, there is nothing much you can do. If you know anything about electrical, and you have a 3 speed fan, pull the cover to get to the switch back, and see what leads the have terminated to the switch. They may have it miswired. I wish you the best of luck,
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Probably a time delay relay fan switch not working.
Could be a bad low speed winding in the fan motor.
Set the wall T-stat for ON fan and see if it works.

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1 Answer

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You are right slow for heat and fast for A/C. Here are the blower speeds black is high blue is med. and red is low if you have orange it would be med low. Look on the control board and see what color wire is connected to heat and let me know if you have something other then control board. You can take the wire that is on park and swap them around. ken

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yes you can as long as the temperature rise is whithin the proper range in heating on you unit data plate there should be the information the you need to have.

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I have never heard of a variable speed Intertherm. If it has multiple wires it is likely just an adjustable fan where you can use a different lead for a different speed. Usually black is high blue is med. hi, red is low, ect. Check your wiring diagram on the furnace door. Why do you want to change the speed?

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Motor speeds on the blower are always remember black is high, blue in med. and red is low sometimes blowers are 4 speeds but the main colors are the black blue and red. Now where to change locate the wires coming from blower to a box or control board. control board has setting for heating and cooling speeds for the blower. You might see blue on heating which would be medium speed so take the red off park terminal and change places with the blue. Now if you have a fan control switch it looks like a dail in the middle of the furnace with numbers on the face with pointers set at the numbers. follow the wires from there to the electrical box and open box. find color of blower and switch be sure to cap off the wire you change. Wire nut would be good.

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