So I have a small appliance with a cap tube that is going to need charging.
My main experience with fixed metering is with pistons on air conditioners. For those, I have to take the indoor wet bulb and outdoor dry bulb and look up the target superheat on a chart. This is a glycol chiller, so I'm assuming the indoor wet bulb would just be replaced with the tank temperature, as there's no condensation forming.
I know I need to charge it by superheat, but how do I figure out what the target is for the current conditions? This is especially important because it'll be in hot pulldown when I first start it up.
I've been told there's a formula for it, that gets simplified into those charts, but I don't know it, or know if it would apply to this scenario. Does anyone have any resources they can share for my education on this matter?
And before anyone asks, there's zero manufacturer data available to me, it was a giant pain just to confirm it was a 500W compressor.
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