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What should be our head pressure on a R22 unit on a 90 degree day?
Wiki User
∙ 11y ago
265 PSI which equals 120 Degrees Fahrenheit, basically you add about 30 to 35 degrees to the outdoor ambient temperature example 90 degree day at 30 to 35degrees which equals 120 degrees on the high side
Wiki User
∙ 11y ago
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