Single Expansion Valve Ice Machines Comparing; Evaporator Inlet And Outlet Temperatures - Manitowoc SD0302A Technician's Handbook

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Single Expansion Valve Ice Machines Comparing

Evaporator Inlet and Outlet Temperatures

This procedure will not work on dual or Quad
NOTE:
expansion valve ice 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. Use a quality temperature meter, capable of
taking temperature readings on curved copper
lines.
2. Attach the temperature meter sensing device to
the copper lines entering and leaving the
evaporator.
Do not simply insert the sensing device under the
insulation. It must be attached to and reading the
actual temperature of the copper line.
3. Wait five minutes into the freeze cycle.
4. Record the evaporator inlet and outlet
temperatures after 5 minutes into the freeze cycle.
Determine the difference.
5. Record the information on the table.
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Part Number 80-1479-3 7/10