Manitowoc Ice Dual Expansion Valve User Manual
S Model Dual Expansion Valve
Refrigeration System Operational Analysis Table
This table must be used with charts, checklists and other references to eliminate refrigeration components not listed on the table
and external items and problems which can cause good refrigeration components to appear defective.
Operational Analysis
(listed below)
Ice Production
Ice Formation Pattern
Left side _________________
Right side ________________
Freeze cycle
DISCHARGE pressure
______ ______ _______
1 minute Middle End
into cycle
Freeze cycle
Suction Pressure
______ ______ _______
1 minute Middle End
Harvest Valve
Wait 5 minutes into the freeze cycle.
Compare temperatures of
compressor discharge line and both
harvest valve inlets.
Comp. Disc. ______ F
Left gas inlet ______ F
Right gas inlet ______ F
1 2 3 4
Published 24 hour ice production ____________________
Calculated (actual) ice production ___________________
NOTE: The ice machine is operating properly if the ice production and ice formation pattern is normal
and ice production is within 10% of charted capacity.
Ice formation is
extremely thin on
top of one side of
evaporator
-or-
No ice formation on
one side of
evaporator
If discharge pressure is High or Low refer to a freeze cycle high or low discharge pressure problem
checklist to eliminate problems and/or components not listed on this table before proceeding.
If suction pressure is High or Low, refer to a freeze cycle high or low suction pressure problem checklist
to eliminate problems and/or components not listed on this table before proceeding.
Suction pressure is
High
One harvest valve
inlet is Hot
-and-
approaches the
temperature of a
Hot compressor
discharge line.
Ice formation is
extremely thin on top of
one or both sides of
evaporator
-or-
No ice formation on
entire evaporator
Suction pressure is
Low
Both harvest valve inlets
are cool enough
to hold hand on
-and-
the compressor
discharge line is Hot.
Ice formation normal
-or-
Ice formation is
extremely thin on bottom
of one side of evaporator
-or-
No ice formation on
entire evaporator
Suction pressure is
High
Both harvest valve inlets
are cool enough
to hold hand on
-and-
the compressor
discharge line is cool
enough
to hold hand on.
Ice formation normal
-or-
No ice formation on
entire evaporator
Suction pressure is
High
Both harvest valve inlets
are cool enough
to hold hand on
-and-
the compressor
discharge line is Hot.
Discharge Line Temperature
Record freeze cycle discharge line
temperature at the end of the
freeze cycle
_________°F (°C)
Final Analysis
Enter total number of boxes
checked in each column.
Discharge line
temperature
150F (65.6C)
or higher
at the end of the
freeze cycle.
Harvest Valve
Leaking
Discharge line
temperature
150F (65.6C)
or higher
at the end of the
freeze cycle.
Low on Charge
-or-
TXV Starving
Discharge line
temperature
less than
150F (65.6C)
at the end of the
freeze cycle.
TXV Flooding Compressor
Discharge line
temperature
160F (65.6C)
or higher
at the end of the
freeze cycle.
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