Hoshizaki KML-325MAJ User manual

Models
KML-325MAJ, MWJ
KML-500MAJ, MWJ
KML-700MAJ, MWJ, MRJ
Modular Crescent Cuber with
Service Manual
Number: 73249
Issued: 5-27-2021
hoshizakiamerica.com

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WARNING
Only qualied service technicians should install and service the appliance.
To obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.

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CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7
A. Construction.................................................................................................................. 7
1. Air-Cooled (MAJ)...................................................................................................... 7
2. Water-Cooled (MWJ) ............................................................................................... 8
3. Remote Air-Cooled (MRJ)........................................................................................ 9
B. Water/Refrigeration Circuit Diagram............................................................................ 10
1. Air-Cooled Models (MAJ) ....................................................................................... 10
2. Water-Cooled Models (MWJ)..................................................................................11
3. Remote Models (MRJ)........................................................................................... 12
II. Sequence of Operation and Service Diagnosis............................................................... 13
A. Sequence of Operation Flow Chart............................................................................. 13
1. Operation Flow Chart............................................................................................. 13
2. Shutdown Flow Chart ............................................................................................ 14
B. Service Diagnosis ....................................................................................................... 15
C. Control Board Check................................................................................................... 22
D. Bin Control Check ....................................................................................................... 24
E. Float Switch Check and Cleaning ............................................................................... 25
F. Thermistor Check......................................................................................................... 27
G. Switches ..................................................................................................................... 28
H. Diagnostic Tables ........................................................................................................ 29
I. Freeze-Up Check List ................................................................................................... 33
III. Controls and Adjustments............................................................................................... 34
A. Control Board Layout .................................................................................................. 35
B. LED Lights and Audible Alarm Safeties....................................................................... 36
C. Settings and Adjustments............................................................................................ 37
1. Default Dip Switch Settings .................................................................................... 37
2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 38
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)................. 38
4. Pump-Out Frequency Control (S4 dip switch 5)..................................................... 39
5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6) ........................... 39
6. Harvest Pump Time (Harvest Assist) (S4 dip switch 7) ......................................... 40
7. Factory Use (S4 dip switch 8)................................................................................. 40
8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 40
9. Float Switch Selector (S5 dip switch 1) ................................................................. 41
10. Rell Counter (S5 dip switch 2 and 3) ................................................................... 41
11. Minimum Harvest Time (S5 dip switch 4) ............................................................... 41
12. Anti-Slush (S5 dip switch 5)................................................................................... 42
IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.

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IV. Refrigeration Circuit and Component Service Information.............................................. 43
A. Refrigeration Circuit Service Information .................................................................... 43
B. Component Service Information.................................................................................. 46
C. Water Regulating Valve Adjustment (water-cooled model) .......................................... 46
V. Maintenance .................................................................................................................... 47
VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 48
VII. Disposal......................................................................................................................... 50
VIII. Technical Information.................................................................................................... 51
A. Specication and Performance Data Sheets............................................................... 51
1. KML-325MAJ.......................................................................................................... 51
2. KML-325MWJ ........................................................................................................ 52
3. KML-500MAJ ......................................................................................................... 53
4. KML-500MWJ ........................................................................................................ 54
5. KML-700MAJ ......................................................................................................... 55
6. KML-700MWJ ....................................................................................................... 56
7. KML-700MRJ.......................................................................................................... 57
B. Wiring Diagram............................................................................................................ 58

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Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT Indicates important information about the use and care of the
appliance.
WARNING
The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:
• Only qualied service technicians should install and service this appliance.
• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations.
• Electrical connection must be hard-wired and must meet national, state, and local
electrical code requirements. Failure to meet these code requirements could result
in death, electric shock, serious injury, re, or damage.
• The icemaker requires an independent power supply of proper capacity. See the
nameplate for electrical specications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuses, damage to existing
wiring, or component failure. This could lead to heat generation or re.
• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
could result in death or serious injury.
• Move the control switch to the "OFF" position and turn off the power supply before
servicing. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• To reduce the risk of electric shock, do not touch the control switch or service switch
with damp hands.
• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, re, or damage to the unit.
• The appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.