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Home Brew Forums > Home Brewing Beer > DIY Projects > Other > Willhi wiring
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Old 01-21-2013, 05:58 PM   #11
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Could any of you awesome electrically knowledgeable types help me out with my Willhi controller?
I would like to just use the wires in the original thermostat to wire up the new controller. Is this possible?

Here is the controller:

img-1.jpg  
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Old 01-21-2013, 05:59 PM   #12
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...and now the original thermostat:

img-2.jpg  
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Old 01-21-2013, 06:17 PM   #13
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Quote:
Originally Posted by bueschen View Post
I would like to just use the wires in the original thermostat to wire up the new controller. Is this possible?

Is it possible using only the wires in the original thermostat? Maybe yes, maybe no.

You will need to figure out what wires you have available at the thermostat. The controller needs both sides of the 220V to power the controller. If only one side comes to the original thermostat, you may still be able to find the other side nearby at a light or fan.

Is there a wiring diagram on the refrigerator anywhere?
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Old 01-21-2013, 06:30 PM   #14
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Unfortunately, no wiring diagram. the light is part of the thermostat housing (towards the bottom of the pic. That probably doesn't help much though.

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Old 01-21-2013, 06:40 PM   #15
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Having the light right there should mean that everything you need is there. You will just have to figure out which wires to use.

Do you have a volt/ohm meter?

Can you identify where the other end of those wires are to help determine what they do?


It looks like the picture shows some labeling printed on the thermostat. Can you get a better picture?

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Old 01-21-2013, 06:49 PM   #16
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I don't have a meter here but could get one tomorrow.
The thermostat has numbers written where the wires go in.
4 - Black (left)
6 - Brown (middle, with green sticker)
3 - Purple(right)

I don't think I could even use a meter though as to get power to the unit I would have to plug it back in to the bracket and then the housing is closed to access.

*edit - It's a Ranco brand thermostat

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Old 01-21-2013, 07:15 PM   #17
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I see now in the picture that the thermostat and light are in a module that plugs in to the bracket. There is one female terminal and three male terminals. I expect that female terminal is probably the other side of the 220V to the light.

Any part number on the Ranco?

Model number for the refrigerator?

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Old 01-21-2013, 07:31 PM   #18
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No part number on the thermo but the fridge is a Bosch FD7608. It's a european model and the info I could find on the net was spotty.

I can tell you that the purple wire powers the light.

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Old 01-22-2013, 03:12 AM   #19
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You're right, I couldn't find anything on that model either.


This will have to be done the hard way. You will need to use the meter to identify the wires to and from that thermostat box.


Can you get at the compressor?

Pictures of the compressor connections and any junctions may help identify where to do tests.

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Old 01-22-2013, 05:13 AM   #20
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I'll have to try to tackle this after work today. I can get to the compressor and the junction box so I'll get it opened up and take some pics later today.


Thanks for all the help Reynolds!

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