Waeco Compressor Fridge Wiring

ROAD RUNNER · Veteran Member

Waeco Compressor Fridge Wiring

DeBe · Guru

Can you post a picture of the compressor controller on your fridge & one of the thermostat you are using.

ROAD RUNNER · Veteran Member

Hi, haven't sent pictures before so hope they show up. The digital thermostat is the one on the LHS reading 33c WAECO Wiring.jpg Digital Thermostat.jpg

DeBe · Guru

You will need to remove the bottom white wire T , as this is where one of the thermostat wires goes to. The other thermostat wire goes to C but leave the grey wire connected to it. You will meed a 650 ohm resistor in the circuit so the compressor runs at 3000RPM this is the value for a BD50 compressor. Power for the thermostat will come from A+ & C-- , this is 12V dc that feeds the internal lighting in the fridge. CONT & THERM.1.JPG CONT & THERM.2.JPG CONT.B.JPG

-- Edited by DeBe on Wednesday 29th of November 2017 09:40:10 PM

-- Edited by DeBe on Wednesday 29th of November 2017 09:43:11 PM

DeBe · Guru

The 1.5K resistor was for a BD35 compressor. Interested to know why you want to change to an electronic thermostat? A good clear picture of the circuit diagram on the back of the fridge would be usefull to.

-- Edited by DeBe on Wednesday 29th of November 2017 09:52:21 PM

Peter_n_Margaret · Guru

BD35 manuals can be downloaded.
Running one at 3000rpm will provide maximum cooling, but will also be least efficient. If the insulation is reasonable it will use less total power if you run the compressor at a slower speed.
Longer cycles at lower speed are more efficient.

Cheers,
Peter

DeBe · Guru

Waeco upright fridges need every bit of cooling compared to the portable ones. Also his fridge has a BD50F compressor in it. My 80L upright has a BD35F in it.

ROAD RUNNER · Veteran Member

Thanks D.L. and Peter for your great advice and detailed wiring help, much appreciated. The reason for going digital is that the standard WAECO thermostat appears to work well in summer however becomes quite "lazy" in the winter and the temperature can rise to around 8c or more before the compressor comes on so I think the gap between on and off is far too wide.
A friend of mine with the same model fridge had a "winter" kit installed by the WAECO dealer in Adelaide which alleviated the problem to a degree but the cost was far in excess of an ebay digital controller for around $20, plus I can see at a glance what the temp is.
Thanks again for your valuable advice. Eddy