Thursday, Dec 27, 2012 at 15:39
bungarra
The Engel uses 12v to run a power inverter to make around 20 V AC.
In other words the 12v is switched on and off into a transformer and stepped up to 20v.
The power box also uses/can use 240v AC and when use it is dropped to around 20v AC and it runs the compressor.
So Both power sources are modified with either electronics and/or circuitry to match the SO CALLED swing motor.
I might add, there is no swing to it at all. It is an oscillating compressor
which is a solenoid with a operating a piston which pumps gas. It just slides back and
forth like a spool vale does in an auto transmission.
Waeoc use a Danfoss 12vDC compressor similar to a house fridge and it needs 12v DC. So the inputs fed to it are either 12vDC od 12vDC via a stepdown transformer/electronic switchmode power supply like a Laptop has. Just different and yes both are electronically controlled and operate the compressor via the thermostat. Some have a soft start action to the electronics too.
What I outlined re test is what I have done years ago to check the situation of the fridge and I fitted electric fans to some long before Engel ever did.
I am not a fridge mechanic I come from an Automotive Technician Technical Engineering background.
Fridges are really simple things but use some complicated physics/electronics and thermodynamics in their design.
Then again I might know bugger all about everything.
Cheers
Ross M
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