A walk-in refrigerator has the following conditions. Which remedy below would most likely solve the problem?

? Box temperature is up to 50°,
? the evaporator temperature is 40°, NORMAL (10° TD)
? the line leaving the evaporator is 50°, NORMAL (10° Superheat)
? the ambient is 70°,
? the condensing temperature is 100°, NORMAL (30° Condenser Split)
? and the liquid line is 90°. NORMAL (10° Subcooling)
a. Adjust the TEV b. clean the condenser c. adjust the tstat d. add refrigerant


c. adjust the tstat

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