A little bird told me 200 gallons per hour per ton is your ballpark rate. The way the practical hackers do it is to start the unit from a hot indoor ambient (hot, summer day after 2pm) temperature, wait 15 minutes, then feel the condenser and output stream. Adjust your flow control for warm, but not hot, output temp (around 100-110 degF). Discharge pressure should be below 250 psi for r22 or r290. The little bird told me 200 psi is normal.
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