Weaco High lows switch ,

All of the info is here at this link to Danfoss

Happy reading Eric

Useful info! To cut a long story short, low is for 12v & high is for 24v.
Frig instructions bit ambiguous from memory.

From the Waeco Website.

This is your battery saving device. .... Basically in most situations you should run your fridge on low, this will allow the battery to rundown to 10.4 volts then your fridge will cut out. On high the fridge will drain your battery down to 11.7 volts then shut off therefore your fridge will run longer on the Low setting.
Go to www.waeco.com.au/includes/findoutmore/fom_detail.asp

Macca

As Macca has advised, the High/Low switch will control the voltage point where the fridge will stop working.
One thing to be aware of though. Have a look at what type of battery you are running your fridge from. Battery life can be significantly reduced by over-discharge. Most articles I've read say not to discharge lead-acid batteries below 10.5v (low setting). Deep Cycle batteries can handle a higher discharge where as Cranking batteries can be totally stuffed by high discharge. If you run your battery from a cranking battery, it's probably best to use the High setting. If you use a deep cycle you can probably use the low setting.

Eric, dont know the 90 specs but would say they same as for the 80 using the bd 50 comppressor,,, from the users manual,,,switch is for setting the battery protection voltage .. cut out voltage 12v low med high
10.4 11.0 12.0

24v 21.6 23.3 25.0

cut in voltage 12v 11.2 12.0 12.9

24v 23.0 24.5 26.3

hope this makes some sense and stops the confusion,,book recomends med setting except for extreme temperatures low/ high as temp has effect on battery performance and life.

Eric,

The FAQ on the waeco site says what it is.

As others have said, it is the low voltage cut out. I can't remember what voltages they are, but I think low is 10.8 roughly, and high is 11.5. As I said, I can't remember it perfectly.

I had mine running for 24 hours, and the multimeter still read 11.8 when the fridge was running. The switch was on high still and the temp was about 3 degress in, and 32 out. Gotta be happy about that. :)