Manitowoc

COMPARING EVAPORATOR INLET/OUTLETTEMPERATURESQ130/Q170/Q210/Q270 Ice Machines OnlyThe temperatures of the suction lines entering andleaving the evaporator alone cannot diagnose an icemachine. However, comparing these temperaturesduring the freeze cycle, along with using Manitowoc’sRefrigeration System Operational Analysis Table, canhelp diagnose an ice machine malfunction.The actual temperatures entering and leaving theevaporator vary by model, and change throughout thefreeze cycle. This makes documenting the “normal”inlet and outlet temperature readings difficult. The keyto the diagnosis lies in the difference between the twotemperatures five minutes into the freeze cycle. Thesetemperatures must be within 7°F (4°C) of each other.Use this procedure to document freeze cycle inlet andoutlet temperatures.1. Use a quality temperature meter, capable oftaking temperature readings on curved copperlines.2. Attach the temperature meter sensing device tothe copper lines entering and leaving theevaporator.ImportantDo not simply insert the sensing device under theinsulation. It must be attached to and reading theactual temperature of the copper line.3. Wait five minutes into the freeze cycle.4. Record the temperatures below and determinethe difference between them.___________ ___________ ___________InletTemperatureDifference must bewithin 7°F (4°C) at5 minutes into thefreeze cycleOutletTemperature5. Use this with other information gathered on theRefrigeration System Operational Analysis Tableto determine the ice machine malfunction.Part Number 80-01111-9 7/10 125