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TXV Hunting Due to Fluctuating Load

Likely causes

TXV superheat setting too low causing oversensitive response

Check: Measure current superheat: evap outlet temp − suction sat. temp (if <3°C it is too low)

What to do: Measure current superheat: evap outlet temp − suction sat. temp (if <3°C it is too low) → Turn TXV adjustment screw clockwise in 1/4-turn increments → Wait 20 minutes and re-measure superheat (target: 5–8°C) → Check stability and repeat if needed

Large evaporator load fluctuations

Check: Turn TXV adjustment screw clockwise in 1/4-turn increments

What to do: Turn TXV adjustment screw clockwise in 1/4-turn increments → Wait 20 minutes and re-measure superheat (target: 5–8°C) → Check stability and repeat if needed

Field tip

Heavy load fluctuations cause TXV hunting as it chases superheat. Increase superheat setting slightly to stabilize. Setting superheat above 10°C reduces cooling capacity. Target the 5–8°C range.

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