Thanks ICANTSEE Attachments from here on my phone so I'll take a look later. The multiple circuits I've seen are nothing special. One tstat multiple circuits.
Originally Posted by ICanHas
On a self-contained hermetic unit with one zone? Self-contained and hermetic retail display case intended for commercial use (UL listed as) is is the only condition in which R-290 is permitted. Remote condenser is not permitted. It takes into account that 5oz of propane is unlikely to lead to issues in volume of space that such an appliance will likely be used in. A three door commercial kitchen reach-in is not a retail display. A failure of any one component can not release more than 5oz of refrigerant at any given time.
Originally Posted by itsiceman
5oz of R-290 is equivalent to 10-12oz of R22 simply because the same mass of refrigerant can flood twice the volume. Given that constraint, cooling capacity is still quite limited. So, a legal multi circuit system would have multiple sets of each component. Compressor, condenser, evaporator, even if they're all tied to same thermostat. But, you might as well zone them if you're going to have multiple circuits so you have better control over temperature.
A household refrigerator is limited to 2oz of R441A or R600a only. R290 is prohibited. So, a logical dual circuit would be one for freezer, one for refrigerator.
It's going to be sometime as hydrocarbon is currently prohibited for such application. The current conditional allowance does not include ice machines or any other commercial kitchen equipment.
Originally Posted by CFESAmasterEGSR