How to check superheat on a walk in freezer with no doubt
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The ability of the evaporator to efficiently exchange heat is totally dependent on having a fully active coil as near to saturated suction temperature of the refrigerant as possible. • check condition of moisture indicator/sightglass in the sight glass if so equipped. Convert pressure to temperature with an app, slide or chart.
Subtract the two numbers to get superheat.
If the superheat is low the tx valve will allow refrigerant to flow into the evaporator at a rate that exceeds the capacity of the evaporator and as a result liquid will enter the suction line. Check compressor and evaporator superheat, adjust if necessary. The evaporator superheat method should be the first effective method of properly charging a fixed refrigerant metering system. To obtain the saturation temperature which corresponds to that pressure, check the reading on the room sensor install or refrigerant maps or charts.
