Service manual

Section 7 Refrigeration System
Part No. 80-1206-3 7-21
REFRIGERATION COMPONENT DIAGNOSTIC CHART
Single Expansion Valve
Q0600C/IB0600C/Q0800C/IB0800C/Q1000C/IB1000C/SU1000C
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 1 2 3 4
Ice Production
Published 24 hour ice production________________
Calculated (actual) ice production_______________
NOTE: The ice machine is operating properly if the ice fill patterns is normal and ice production is within 10% of charted
capacity.
Installation and Water
System
All installation and water related problems must be corrected before proceeding with chart.
Ice Formation Pattern
Ice formation is extremely
thin on outlet of Evaporator
or
No ice formation on the top
of the evaporator
Ice formation normal
-or-
Ice formation is extremely
thin at the evaporator outlet
-or-
No ice formation on entire
evaporator
Ice formation normal
-or-
Ice formation is extremely
thin at the evaporator inlet
or
No ice formation on entire
evaporator
Ice formation normal
-or-
No ice formation on entire
evaporator
Safety Limits
Refer to “Analyzing Safety
Limits” to eliminate all non-
refrigeration problems.
Stops on safety limit:
1 or 2
Stops on safety limit:
1 or 2
Stops on safety limit:
1 or 2
Stops on safety limit:
1
Freeze Cycle
Discharge Pressure
_____ ______ ______
1 minute Middle End
into cycle
If discharge pressure is High or Low refer to freeze cycle high or low discharge pressure problem checklist to eliminate
problems and/or components not listed on this table before proceeding.
Freeze Cycle
Suction Pressure
_____ ______ ______
1 minute Middle End
If suction pressure is High or Low refer to 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
Suction pressure is
Low or Normal
Suction pressure is
Normal or High
Suction pressure is
High
Cool Vapor Valve
Audible refrigerant flow
through valve in freeze cycle
No audible refrigerant flow
through valve in freeze cycle
No audible refrigerant flow
through valve in freeze cycle
No audible refrigerant flow
through valve in freeze cycle
Suction Line Temperature
Attach a temperature probe on
the suction line with-in 6” of the
shut-off valve outlet.
Record the low event at the
end of the freeze cycle.
Suction line temperature at
the suction shut-off valve is
greater than 10°F(-12.2°C)
at the end of the freeze
cycle.
Suction line temperature at
the suction shut-off valve is
greater than 10°F (-12.2°C)
at the end of the freeze
cycle
Suction line temperature at
the suction shut-off valve is
less than 10°F (-12.2°C)
at the end of the freeze
cycle
Suction line temperature at
the suction shut-off valve is
greater than 10°F (-12.2°C)
at the end of the freeze
cycle
Final Analysis
Enter total number of boxes
checked in each column.
Cool Vapor Valve Leaking
Low On Charge
-Or-
TXV Starving
Refrigerant Overcharge
-Or-
TXV Flooding
Compressor