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That is correct if Superheat is off on Chiller it makes the entire system off. The Chiller manufacture should give you a measured charge, there is a formula to calculate refrigerant. You can not charge these cars by pressure and a little more or a little less. With a Chiller system you have a + or – of half an oz. I’m not going to speak to another brand but I can say all of our kits are +2oz too +3oz. Most of the additional refrigerant is in the liquid line the low side is a gas so not much volume.
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