Comparing Evaporator Inlet/Outlet Temperatures - Koolaire KDT0300A Technician's Handbook

Comparing Evaporator Inlet/Outlet
Temperatures
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 the 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 must be within 7°F (4°C) 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 temperatures below and determine the
difference between them.
___________
Inlet Temperature Difference must be within
5. Use this with other information gathered on the
Refrigeration System Operational Analysis Table to
determine the ice machine malfunction.
Part Number STH063 9/17



mportant
___________
7°F (4°C) at 5 minutes into
the freeze cycle
___________
Outlet
Temperature
75