Refrigeration System Operational Analysis Tables - Manitowoc S Service Manual

Section 7

REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES

Operational Analysis
Ice Production
Installation and Water System
Ice Formation Pattern
Safety Limits
Refer to "Analyzing Safety Limits" to
eliminate all non-refrigeration
problems.
Freeze Cycle
Discharge Pressure
_____ ______ ______
1 minute Middle End
into cycle
Freeze Cycle
Suction Pressure
_____ ______ ______
1 minute Middle End
Wait 5 minutes into the freeze cycle.
Compare temperatures of
evaporator inlet & evaporator
outlet.
Inlet ____ ° F (° C)
Outlet ____ ° F (° C)
Difference ____ ° F (° C)
Wait 5 minutes into the freeze cycle.
Compare temperatures of
compressor discharge line
and harvest valve inlet.
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.
Part Number 80-1480-3
S Models Single Expansion Valve - Ice Machine Model Number_________________
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.
1
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.
All installation and water related problems must be corrected before proceeding with chart.
Ice formation is extremely
thin on outlet of evaporator
-or-
No ice formation on the
entire evaporator
Stops on safety limit:
1
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.
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
Inlet and outlet
within 7°
of each other
The harvest valve inlet is
Hot
-and-
approaches the temperature
of a Hot compressor
discharge line.
Discharge line temperature
160°F (71.1°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
Harvest Valve Leaking
2
Ice formation is extremely
thin on outlet of evaporator
-or- Ice formation is extremely
No ice formation on entire thin on inlet of evaporator
evaporator
No ice formation on entire
Stops on safety limit:
1
Suction pressure is Low or Suction pressure is High
Normal
Inlet and outlet
not within 7°
of each other
-and-
Inlet is colder than outlet
Inlet is warmer than outlet
The harvest valve inlet is The harvest valve inlet is
Cool enough to hold hand Cool enough to hold hand
on
-and-
the compressor discharge the compressor discharge
line is Hot.
enough to hold hand on.
Discharge line temperature Discharge line temperature
160°F (71.1°C)
or higher at the end of the 160°F (71.1°C) at the end
freeze cycle
------------------------------------- -------------------------------------
S850/S1000
Air & Water Only
Discharge line temperature Discharge line temperature
140°F (60°C)
or higher at the end of the 140°F (60°C) at the end of
freeze cycle
Low On Charge
-Or-
TXV Starving
Refrigeration System
3
Ice formation normal Ice formation normal
-or-
No ice formation on entire
-or-
evaporator
Stops on safety limit: Stops on safety limit:
1 or 2
Suction pressure is High
Inlet and outlet Inlet and outlet
within 7°
of each other
-or-
Inlet and outlet
not within 7°
of each other
-and-
The harvest valve inlet is
Cool enough to hold hand
on
-and-
the compressor discharge
line is Cool
Discharge line
less than temperature 160°F
(71.1°C) or higher at the
of the freeze cycle end of the freeze cycle
-----------------------------------
S850/S1000 S850/S1000
Air & Water Only Air & Water Only
Discharge line
less than temperature 140°F (60°C)
or higher at the end of
the freeze cycle the freeze cycle
TXV Flooding
4
-or-
evaporator
1
within 7°
of each other
on
-and-
line is Hot.
Compressor
7-23