Manitowoc J250 User Manual

Section 7Refrigeration System
7-24
J Model Single 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)
123 4
Ice Production
Published 24 hour ice production: ______________
Calculated (actual) ice production: ______________
NOTE: The ice machine is operating properly if the ice production and the ice formation pattern is normal.
Installation and Water
System
Installation and/or water-related problems can simulate a refrigerant component malfunction. Refer to
“Installation/Visual Inspection Checklist” and “Water System Checklist” and correct all problems before
proceeding.
Ice Formation Pattern
_________________________
_________________________
NOTE: It is normal for the “dimples”
in the ice cubes on the top of the
evaporator to be more pronounced
than the dimples” in the ice cubes
on the bottom of the evaporator.
1. Ice formation is
extremely thin on top of
evaporator
-or-
2. No ice formation on
entire evaporator
❏
1. Ice formation is
extremely thin on top of
evaporator
-or-
2. No ice formation on
entire evaporator
❏
1. Ice formation is normal
-or-
2. Ice formation is
extremely thin on bottom of
evaporator
-or-
3. No ice formation on
entire evaporator
❏
1. Ice formation is normal
-or-
2. No ice formation on entire
evaporator
❏
Safety Limits
Refer to “Safety Limits” to
eliminate problems and/or
components not listed
on this table.
Stops on safety limit:
1
❏
Stops on safety limit:
1 or 4
❏
Stops on safety limit:
1 or 2 or 3
❏
Stops on safety limit:
1 or 4
❏
Wait five minutes into the
freeze cycle.
Compare compressor
discharge line temp. to
hot gas valve inlet temp.
Compressor ______°
Hot Gas Inlet ______°
Inlet of hot gas valve is
HOT
-and-
approaches the
temperature of a
HOT compressor
discharge line
❏
Inlet of hot gas valve is
COOL enough to hold
hand on
-and-
compressor
discharge line is
HOT
❏
Inlet of hot gas valve is
COOL enough to hold
hand on
-and-
compressor discharge line
is COOL enough to hold
hand on
❏
Inlet of hot gas valve is
COOL enough to hold
hand on
-and-
compressor
discharge line is
HOT
❏
Wait five minutes into the
freeze cycle.
Compare inlet to outlet of
evaporator temp.
Inlet _____° Outlet _____°
Difference _____°
Inlet and outlet
WITHIN 7°
°°
°F
of each other
❏
Inlet and outlet
NOT within 7°
°°
°F
of each other
-and-
Inlet is colder than outlet
❏
1. Inlet and outlet
WITHIN 7°
°°
°F
of each other
-or-
2. Inlet and outlet
NOT within 7°
°°
°F
of each other
-and-
Inlet is warmer than outlet
❏
Inlet and outlet
WITHIN 7°
°°
°F
of each other
❏
Freeze cycle
DISCHARGE pressure
________ ________ ________
1 minute Middle End
into cycle
If discharge pressure is High or Low, refer to a freeze cycle high (or low) discharge pressure checklist to
eliminate problems/components not listed on this table before proceeding.
Freeze cycle
SUCTION pressure
If suction pressure is High or Low, refer to a freeze cycle high (or low) suction pressure checklist to
eliminate problems/components not listed on this table before proceeding.
________ ________ ________
1 minute Middle End
into cycle
Suction pressure is:
HIGH
❏
Suction pressure is:
LOW
❏
Suction pressure is:
HIGH
❏
Suction pressure is:
HIGH
❏
Miscellaneous
Enter items in proper boxes.
❏❏❏ ❏
Final Analysis
Total the number of boxes
checked in each column.
Column 1 Total: __
Hot Gas Valve
Leaking
Column 2 Total: __
Low on Charge
-OR- TXV Starving
Column 3 Total: __
TXV Flooding
Column 4 Total: __
Compressor
MANITOWOC ICE, INC.
2110 South 26th Street P.O. Box 1720 Manitowoc, WI 54221-1720
Phone: (414) 682-0161 Service Fax: (414) 683-7585
Web Site: http://www.manitowoc.com

Manitowoc J250 Specifications

General

Brand	Manitowoc
Model	J250
Category	Ice Maker
Language	English