A/C Electricians? - DPChallenge Forums

Canon EF-S 18-55mm f/3.5-5.6 USM

05/20/2007 04:59:15 PM · #1

I'm wondering if anyone has experience with this. Something basic and simple to the knowledgeable. I recently had my complete central air/heating system replaced. I asked the people to leave me the blower, as I want to use it as a fan when I work outside or in cramped quarters. I do not know how to wire it and was wondering if anyone does. It is a one speed blower, with wires one each of a blue, black, red, white. I have an industrial plug I wish to wire it to to run on 110v. Can anyone tell me which wires I would need to use and what each one is? Thanks.

RayEthier

Canon EOS-5D Mark II

05/20/2007 06:33:06 PM · #2

Does this help? A/C Wiring Diagram

Ray

Tamron AF 70-300mm f/4.0-5.6 LD for Canon

05/20/2007 09:32:26 PM · #3

Thanks, but no. It doesn't list the color wires I have. I also need to know which is hot, ground, fan speed, etc. But thanks very much for the link.

Man_Called_Horse

Canon EOS-300D Rebel

05/20/2007 09:48:33 PM · #4

White is the common, or neutral.

But, the other colors are, at least to me, hot.

Green would be considered ground.

Red, black, and blue are hot.

White neutral.

What you are saying is that this is a 220v connection.

Try this.

Get yourself some 12/3, or 16/3 SJO electrical cable. Put a Hubble Edison plug on one end. Open up the other end to expose the wire.

You know white is neutral, so keep that connected to your blower.

Fold the green back for now on the SJO.

Be careful from here on out.

Find which color actually turns the blower. Elimination process.

Plug in your hubble to a 110v outlet, preferably one with a 20amp circuit. 15 will do fine as well.

If you find a color wire that works. Take note which one it is.

Get some wire caps, some electrical tape.

Cap and tape up the white and the color wire that you found.

Now, take that green wire that I had you fold back and connect it to the housing of the blower. A screw or something that will hold the green wire in place.

Hope this helps.

scott180

Canon EOS-30D

05/20/2007 10:11:35 PM · #5

Usually in a three phase wiring scheme, the hots are black, red, and blue. I don't know much about HVAC wiring, but I know that it's usually a problem to run a motor on the wrong phase system. Although I don't know why there would be a three phase motor in a residential HVAC system...

MelonMusketeer

Nikon D7000

Nikon MF 50mm f/1.4

05/20/2007 10:48:33 PM · #6

A couple of questions:
1- Did it operate on 220 V when it was in the A/C ? Most A/C service motors are for one voltage only, and cannot be switched to another.
2- Did it have a capacitor (run cap, little metal can with 2 or 3 terminals on the top) connected to it when it was in the unit, if so, then this will have to be connected, correctly, to make it run.

To continue, most HVAC motors running multi speed use the three colors
Black = High
Blue = Medium
Red = Low
Connect to only one of the above 3. The motor will burn out in a couple of seconds if you hook 220 volts from one speed to another at the same time.
The white wire is the neutral ( usually white) for 120 volts, and with 220 volt motors, it can be connected to either of the two power wires. I assume that you are in the US since you are talking about using 110 volts.
If you get it running, the current will be high unless you block off some of the air coming into it or out of it. They are designed with the blower to have some resistance to air flow as would normally occur with ducts attached.
If the motor is 220 volt, and had no capacitor wired to it (usually brown wire and brown with a white stripe), then it is an induction motor, and will run on 110, but at a greatly reduced speed and power. Watch to see if it overheats. Be sure to connect the green ground wire to the motor, and also to the blower housing.
Be careful with the voltage. Get a handi box and connectors to put your wire connections in so that they are not exposed or dangerous.
If you look on the side of the motor, there will likely be a name plate with the electrical data and wire connection diagram showing the voltage and wire connections. L 1 and L 2 are the power connections in the diagram.
Get set up so that you can take pics of the smoke coming out of it if you fry it. This is, after all, a photo site.

Good luck.

Message edited by author 2007-05-20 23:01:58.

05/20/2007 11:27:16 PM · #7

Thanks to you all for your suggestions. I will try them and post what happens. I'll have the camera ready if the smoke starts flowing, though!