Manitowoc SR1801W Spécifications télécharger pdf (Page 118)

118 Part Number 80-1479-3 7/10

Single Expansion Valve Ice Machines Comparing

Evaporator Inlet and Outlet Temperatures

NOTE: This procedure will not work on dual or Quad

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.

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.

Important

Do not simply insert the sensing device under the

insulation. It must be attached to and reading the

actual temperature of the copper line.

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Manitowoc SR1801W Spécifications Page 118