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New Member
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Jan 2, 2010, 08:34 AM
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Magic chef furnace wiring schematic
I have an old Magic Chef gas furnace in my garage. Gas is connected, but wiring for fan and thermostat are a question. 55K BTU, 12 amp blower. Need to know what wires to connect to thermostat. Also, there are three wires exiting furnace. I know which ones power the 110v blower, but there is a third (white) wire of smaller gauge. Don't know what this one is for. Can you help?
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Ultra Member
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Jan 2, 2010, 08:40 AM
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Does the furnane have a model number
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New Member
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Jan 2, 2010, 09:38 AM
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Model # G66-55D2C2-6
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New Member
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Jan 2, 2010, 10:08 AM
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Originally Posted by wmproop
does the furnane have a model number
Yes, Model G66-55D2C2-6
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Heating & Air Conditioning Expert
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Jan 2, 2010, 11:21 AM
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Magic Chef was bought out by Maytag in 1986 so that is a old unit. Sorry but I do not have a manual for that unit. Post pictures and we will see if we can figure it out.
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New Member
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Jan 2, 2010, 04:45 PM
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Thanks for your help. I have pics posted at this URL:
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Heating & Air Conditioning Expert
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Jan 2, 2010, 06:09 PM
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Sorry I do not have a snap fish account. Go to advanced and hit the paper clip then post here.
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New Member
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Jan 3, 2010, 05:56 AM
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Again, thanks for looking at this for me. One pic shows the three wires exiting the unit. The close up of the transformer shows two pair of wires, yellow/blue, red/green.
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Heating & Air Conditioning Expert
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Jan 3, 2010, 09:52 AM
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First you better have a look inside the 4X4 handy box the fan center is mounted on. Usually white wires go to the neutral line of the 120 volts and the black goes to the hot side of 120 volts. There also should be a screw or ground point inside or on that 4X4 box for a ground. The GROUND is the most important wire since if it is not properly attached the shock in case of a fault can KILL YOU. So take the fan center off the box and investigate the situation and at that time trace both white wires down and get me a picture of the inside of the box so we can find the ground point. Also you will be using a box connector and all wiring splices will be made IN THAT BOX so the job is done properly.
While you have it apart you need to find the manufacturer and the model number of the fan center (the transformer and relay combo is called a fan center). This way I will find a wiring diagram for you of your fan center.
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New Member
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Jan 3, 2010, 05:18 PM
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Heating & Air Conditioning Expert
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Jan 3, 2010, 05:45 PM
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On the left side of the 4X4 box is the screw (hex head) for the ground from the 120 volt line.
Looks like the two white wires go together and then go to the white neutral wire from the 120 volt power.
Then the black wire goes to the black power wire from the 120 volt line.
All connections wire nut and go in the box. You will need a romex connector to attach the feed wire from the power source to the 4X4 box. The feed wire goes into the box connector then the box connector is attached to the 4X4 box. This allows all the power wires to be neat and within code.
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New Member
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Jan 3, 2010, 05:51 PM
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Thanks again! I'll follow your instructions. Referring back to the pics I sent earlier, does it make a difference which of the colored wires I will connect to my thermostat cable? Or should I just pick a pair? No AC involved here.
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Heating & Air Conditioning Expert
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Jan 3, 2010, 05:59 PM
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Use Red=R or RH and White=W. Those are for heat to bring the furnace on.
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New Member
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Jan 4, 2010, 05:04 AM
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I have two pair: red/blue, yellow/green. No white.
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Heating & Air Conditioning Expert
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Jan 4, 2010, 07:50 AM
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From my previous post
While you have it apart you need to find the manufacturer and the model number of the fan center (the transformer and relay combo is called a fan center). This way I will find a wiring diagram for you of your fan center.
Post the above requested info so I can find the correct fan center.
Exact model and Brand
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New Member
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Jan 4, 2010, 04:04 PM
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Sorry, overlooked that in your previous post.
FAN CENTER: ESSEX 175-232101-10
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Heating & Air Conditioning Expert
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Jan 4, 2010, 04:59 PM
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Are we talking about the low voltage thermostat wiring?
Essex NLA but here is a W/R diagram for there fan center.
Color code should be the same. You will only use the R=RED and W=White wire from the thermostat since the furnace will be heat only.
You should already have the 120 volt power hooked up.
http://www.white-rodgers.com/wrdhom/..._06_pg0104.pdf
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New Member
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Jan 5, 2010, 06:52 AM
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Yes, low voltage thermostat wiring remains my question. I have two pair: red/green, yellow/black. No white. I have the 120v wired and ready. Will I need to have a "heat only" thermostat?
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Heating & Air Conditioning Expert
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Jan 5, 2010, 08:59 AM
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I have two pair: red/green, yellow/black
Are these wires coming from the thermostat?
The normal heat colors are W=white and R=Red
Green is for the activation of the blower for A/C use
Yellow is for outside A/C unit activation.
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