Quote:
Originally Posted by MEMPHIS91
Jeff, Sorry I totally forgot to say that after your suggestions about not using the R600 I decided not to. I mentioned it in a previous post to say that the pressures were about the same as R290.
So am I understanding this right? I need a higher suction pressure? I think that is the only way to get more flow/capacity. So I may open up my cap tube some and charge with a higher pressure gas. In which case I only have 2 options. R152A or R134A
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Both of these gases have lower vapor pressures than propane. To pull lots of heat from the ground, either one would need less than 25 psi gauge pressure. For pure propane, you are probably a little overcharged already. For higher vapor pressures you need to go the other way, towards methane, ethane, ether and the like.
If you are trying to force feed your compressor more pressure to make it act like r410 you have your work cut out for you. In fact, there are no real substitutes for r410. It was engineering and management racking up hours of work that came up with the stuff in the first place. The closer gases to it in behavior will not run at the high pressures and burn things up if you force them to.