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120 Part Number: 000015430 Rev 02 5/20
Comparing Evaporator Inlet and Outlet Temperatures -
Valve Machines
The temperatures of the suction lines entering and leaving
the evaporator alone cannot diagnose an ice machine.
However, comparing these temperatures during the
freeze cycle, along with using Manitowoc’s Freeze Cycle
Refrigeration System Operational Analysis Table, can help
diagnose an ice machine malfunction.
The actual temperatures entering and leaving the
evaporator vary by model, and change throughout the
freeze cycle. This makes documenting the “normal”
inlet and outlet temperature readings difficult. The key
to the diagnosis lies in the difference between the two
temperatures five minutes into the freeze cycle. These
temperatures should be within 7° of each other.
Use this procedure to document freeze cycle inlet and
outlet temperatures.
1. Navigate to Service/Diagnostics/Temperature Sensors.
2. Wait 5 minutes into the freeze cycle.
3. Record the evaporator inlet (T3) and outlet (T4)
temperatures at 5 minutes into the freeze cycle.
Determine the difference.
4. Record the information on the table.
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