Ice Formation Pattern; Evaporator Tubing Routing - Manitowoc QR0670C Technician Manual

Ice Formation Pattern

Evaporator ice formation pattern analysis is helpful in
ice machine diagnostics.
Analyzing the ice formation pattern alone cannot
diagnose an ice machine malfunction. However, when
this analysis is used along with Manitowoc's
Refrigeration System Operational Analysis Table, it
can help diagnose an ice machine malfunction.
Any number of problems can cause improper ice
formation.
Example: An ice formation that is "extremely thin at
evaporator outlet" could be caused by a hot water
supply, a dump valve leaking water, a faulty water fill
valve, a low refrigerant charge, etc.
Keep the water curtain in place while checking the
ice formation pattern to ensure no water is lost.

Evaporator Tubing Routing

Routing of the tubing on the back of the evaporator
determines the ice fill pattern failure mode. The
evaporator outlet tubing does not exit directly at the
top of the evaporator, but exits several inches below
the top of the evaporator. Extremely Thin at the
Evaporator Outlet will first be visible several inches
below the top of the evaporator. Extremely Thin at
Evaporator Inlet will first be visible at the bottom of the
evaporator.
Outlet
Inlet
Important
Thin at Inlet
–131–
Thin at Outlet