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Derating Chart Nec

Derating Chart Nec - I am taking a course on home energy and this question of derating gas fired boilers and. I have a question that i am hoping a hvac professional out there can help me with. It seems i may have been working under a false understanding of ac vs. Derating as the wiki and other google articles says operating the part at lower values than rated specifications to prolong its life. I understand the lead temperature. On a drycooler when you need to keep freeze protection down to say 0 there is. Something like the image shown below: Derating will depend on the percentage of glycol in the mixture, so there is no single number. Can some please explain what exactly is derating? how it is. The image is the derating curve.

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