Welbilt KOOLAIRE K0170 Series, Installation Manual, Page: 197 / 200

© Welbilt, Inc.
Refrigeration Troubleshooting
197
Troubleshooting:
•
Ice Production
• Installation
•
Ice Formation
• Discharge Pressure
• Suction Pressure
•
Evaporator Inlet & Outlet
• Harvest Valve Test
•
Discharge Line Temperature Test
• Final Analysis
Complete
Single Evaporator, Single Expansion Valve
Air, Water and Traditional Remote 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 1 2 3 4
Ice Production Air-Temperature Entering Condenser__________
Water Temperature Entering Ice Machine_______
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
entire evaporator
Ice formation is
extremely thin on outlet
of evaporator
-or-
No ice formation on
entire evaporator
Ice formation normal
-or-
Ice formation is extremely
thin on inlet of evaporator
-or-
No ice formation on entire
evaporator
Ice formation normal
-or-
No ice formation on
entire evaporator
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
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.
________ _______
_______
1 minute Middle End
Suction pressure is
High
Suction pressure is
Low or Normal
Suction pressure is
High
Suction pressure is
High
Wait 5 minutes into the freeze
cycle.
Compare temperatures of
evaporator inlet & evaporator
outlet.
Inlet ______ ° F ( ° C)
Outlet ______ ° F ( ° C)
Difference______
°
F (
°
C)
Inlet and outlet
within 7
°
F (4
°
C)
of each other
Inlet and outlet
not within 7
°
F (4
°
C)
of each other
-and-
Inlet is colder than outlet
Inlet and outlet
within 7
°
F (4
°
C)
of each other
-or-
Inlet and outlet
not within 7 ° F (4 ° C)
of each other
-and-
Inlet is warmer than outlet
Inlet and outlet
within 7
°
F (4
°
C)
of each other
Wait 5 minutes into the freeze
cycle.
Compare temperatures of
compressor discharge line and
harvest valve inlet.
The harvest valve inlet is
Hot
-and-
approaches the
temperature of a Hot
compressor discharge
line.
The harvest valve inlet is
Cool enough
to hold hand on
-and-
the compressor
discharge line is Hot .
The harvest valve inlet is
Cool enough
to hold hand on
-and-
the compressor discharge
line is Cool enough
to hold hand on.
The harvest valve
inlet is 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)
Discharge line
temperature
150 ° F (65 ° C)
or higher
at the end of the freeze
cycle.
S850/S1000
Air & Water Only
Discharge Line
Temperature 140 ° F
(60 ° C) or higher at the
end of the freeze cycle
Discharge line
temperature
150 ° F (65 ° C)
or higher
at the end of the freeze
cycle.
S850/S1000
Air & Water Only
Discharge Line
Temperature 140 ° F
(60 ° C) or higher at the
end of the freeze cycle
Discharge line
temperature
less than
150
°
F (65
°
C)
at the end of the freeze
cycle.
S850/S1000
Air & Water Only
Discharge Line
Temperature less than
140 ° F (60 ° C) at the end
of the freeze cycle
Discharge line
temperature
150 ° F (65 ° C)
or higher
at the end of the
freeze cycle.
S850/S1000
Air & Water Only
Discharge Line
Temperature 140 ° F
(60 ° C) or higher at
the end of the freeze
cycle
Final Analysis
Enter total number of boxes
checked in each column.
Harvest Valve Leaking
Low on Charge
-or-
TXV Starving
TXV Flooding Compressor