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Re: reduce blower speed
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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First check your thermostat.. RED wire(power) should be connected to the GREEN wire(fan).... a Multi- Meter should read 24v if you have power. If there's power going to the FAN(Green) Then your looking at a Bad Blower Motor (AND, OR) A bad Capacitor.
Hopefuly it's just a loose wire or bad capacitor,, the motor isnt cheap.. !!!STAY SAFE!!!!!.. and best of luck to you.....
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!
what makes you think there a problem with the blower, Most newer blowers have multi-speeds so be careful to only have two wires hooked up at a time , always have the ground hooked up, usually the white wire and then try black for high speed, make sure fan is secure it may shift. to check low speed connect only the red wire to power and the white wire to gound . depending on motor, other colors would be medium and medium high is so equipped. if motor gets hot after a while check for a capacitor, they have a tendency to get weak, replace with exact same capacitor. let me know why you suspect the blower.
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.
Hello, a limit switch is there to protect the furnaace from overheating. most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open. Check filter, blower wheel for dirt, and make sure the blower motor is running properly and not dragging.
Check the air filter and clean. If you can, raise the blower speed up to the next speed. Make sure all of the supply and return grills are open. Is the ductwork connected under the home and well insulated? Does the furnace ever stop or keep on running? If it does stop, you may have a bad thermostat.
The chances are that the furnace was running when the power went out. This will cause the high limit switch to cutout and needs to be manually reset.
You will find that switch in the blower compartment near the blower. Usually somewher near the highest point of the cabinet.
Push the little red button firmly till it clicks.
When the power goes out while the furnace is running the heat builds up because the blower shuts down immediately and causes this limit switch to cut out.
If you have a electric tester you can also follow the low voltage circuit till you find the open switch. Ther is usually a wiring schematic on the door cover of most furnaces.
I hope that this will help you to solve your problem!
The wires to your blower are connected at the control board. To hook up a 120V to the furnace, on this model, is located on the left hand side of the burner section. There is a black and white wire in a small 2"x 3" box. The control board selects which wire to power the motor depending on what mode you are in.