My thaughts on this are that the beter way is speed controlled by the temperature as in the Waeco system. Where if the temperature rises too high the processor then gives a higher compressor speed. then reduces it when the temperature is nearer where it should be. That being said im not into processor design. My approach in portable 12V DC refrigeration is simple is best. I do have 2 Waeco fridges, but I also converted a Evakool fiberglass esky which has far beter insulation than the Waecos. I just used a $15 electronic thermostat from Ebay. My compressor speed has a switch for economy 2000rpm & power 3000rpm. It spends most of its time on the economy seting, The power setting is only used if ive loaded the fridge up & want it cooled quickly, then it lives on economy. This is my converted Esky.View attachment 97515 View attachment 97516 View attachment 97517 View attachment 97518

Daryl...what is the wattage of the fixed resistor you use for speed control? Thank you.

Moderator edit; New thread created from this.

 

If you are going to try & repair this, then you need to know how the system works. The failure of the 240V ac side is common & hardly worth repairing. Easier to just use it on 12V & use a external powersupply. Heres the basic block diagram of the unit from Danfoss. The 27 - 45V DC varies depending on the selected compressor speed..View attachment 241419View attachment 241420View attachment 241421

Daryl...sorry for popping in from an old thread...but...you put together a Danfoss Speed Controller which referenced a fixed resistor in the thermostat leg. Do you recall the wattage of that 680 ohmer? Thank you.

Moderator edit: New thread created from this.

 

Daryl...what is the wattage of the fixed resistor you use for speed control? Thank you.

Half watt is what i used.

 

Was a Half watt resistor.

 

Was a Half watt resistor.

Daryl...thanks mucho.

 

Anyone with experience with a Sikelan compressor? I read it is similar to a Danfoss with controller.

 

Looking at the data on them, they are basicly a copy of a Danfoss unit.

 

Looking at the data on them, they are basicly a copy of a Danfoss unit.

Thanks for your view. I am swapping a 12vdc Sikelan for a 120vac compressor in a 7.5 cuft refrigerator in my RV. I am using a rotary cam switch to select the resistors to control the compressor speed thus power consumption and cooling capacity.

 

Thanks for your view. I am swapping a 12vdc Sikelan for a 120vac compressor in a 7.5 cuft refrigerator in my RV. I am using a rotary cam switch to select the resistors to control the compressor speed thus power consumption and cooling capacity.

Thanks for your view. I am installing a 12vdc Sikelan in place of a 120vac compressor in a 7.5 cuft refrigerator in my RV. I am using a rotary cam switch to select the resistors to control the compressor speed thus power consumption and to select capacity.

 

On a small 8 cuft refrigerator compressor, if the pipe IDs and wall thicknesses the same, can either the service or suction pipe be used for evaluation and charging after a service valve is brazed in?

 

You could but is better to use the service pipe on the compressor.