Target Superheat Calculator
Determine proper target superheat for fixed-orifice (piston) metering devices using indoor wet bulb and outdoor dry bulb temperatures.
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Frequently asked questions
What is target superheat used for?
Target superheat is used as a charging reference for fixed-orifice or piston systems. It helps compare measured superheat against the expected value based on indoor wet bulb and outdoor dry bulb conditions.
Should I use target superheat on a TXV system?
No. TXV systems are generally charged using subcooling, not target superheat, unless the manufacturer specifically instructs otherwise.
Why does indoor wet bulb matter?
Indoor wet bulb reflects the return-air enthalpy and moisture load. It directly affects the expected evaporator performance and therefore the target superheat value.
What if my readings are outside the chart range?
If indoor wet bulb or outdoor dry bulb are outside the supported chart range, treat the result as unavailable and verify charging with manufacturer data and full diagnostic procedure.
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