Hoshizaki KM-320MAH User manual

Hoshizaki
“A Superior Degree
of Reliability”
www.hoshizaki.com
Models
KM-320MAH, MWH
KM-515MAH, MWH, MRH
KM-600MAH
KM-650MAH, MWH(-M), MRH
KM-901MAH, MWH, MRH/3
Modular Crescent Cuber
Hoshizaki America, Inc.
Number: 73196
Issued: 4-29-2013
SERVICE MANUAL

2
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. Proper installation is the
responsibility of the installer. Product failure or property damage due to improper
installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the appliance.
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]
HOSHIZAKI AMERICA, INC.
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 ................................................................................................. 6
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 8
A. Construction.................................................................................................................. 8
1. Air-Cooled Models (MAH) ........................................................................................ 8
2. Water-Cooled Models (MWH(-M)) ........................................................................... 9
3. Remote Models (MRH/3)....................................................................................... 10
B. Water/Refrigeration Circuit Diagram.............................................................................11
1. Air-Cooled Models (MAH) .......................................................................................11
2. Water-Cooled Models (MWH(-M)) ......................................................................... 12
3. Remote Models (MRH/3)....................................................................................... 13
II. Sequence of Operation and Service Diagnosis............................................................... 14
A. Sequence of Operation Flow Chart............................................................................. 14
1. "E" and "G" Control Board without Harvest Pump Timer Operation ....................... 14
2. "G" Control Board with Harvest Pump Timer Operation ....................................... 16
B. Service Diagnosis ....................................................................................................... 17
1. "E" and "G" Control Board without Harvest Pump Timer Diagnosis ....................... 18
2. "G" Control Board with Harvest Pump Timer Diagnosis ........................................ 24
C. Control Board Check................................................................................................... 30
D. Bin Control Check ....................................................................................................... 31
1. Thermostatic Bin Control Check ............................................................................ 31
2. Mechanical Bin Control Check and Cleaning ....................................................... 32
E. Float Switch Check and Cleaning ............................................................................... 34
1. Float Switch Check ................................................................................................ 34
2. Float Switch Cleaning............................................................................................ 35
F. Thermistor Check......................................................................................................... 36
G. Diagnostic Tables........................................................................................................ 37
III. Controls and Adjustments............................................................................................... 41
A. Control Board Layout .................................................................................................. 42
1. "E" Control Board .................................................................................................. 42
2. "G" Control Board ................................................................................................. 43
B. LED Lights and Audible Alarm Safeties....................................................................... 44
1. "E" Control Board .................................................................................................. 44
2. "G" Control Board ................................................................................................. 45
C. Settings and Adjustments............................................................................................ 46
1. Default Dip Switch Settings .................................................................................... 46
a) "E" and "G" Control Board without Harvest Pump Timer Operation.................. 46
b) "G" Control Board with Harvest Pump Timer Operation.................................... 46
2. Harvest Timer (S4 dip switch 1 & 2) ...................................................................... 47
3. Pump-Out Timer (S4 dip switch 3 & 4) .................................................................. 47
4. Pump-Out Frequency Control (S4 dip switch 5 & 6) .............................................. 48
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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5. Bin Control Selector or Harvest Pump Timer Operation (S4 dip switch 7)............. 48
6. Factory Use (S4 dip switch 8)................................................................................ 49
7. Freeze Timer (S4 dip switch 9 & 10)....................................................................... 49
8. Float Switch Selector (S5 dip switch 1): "G" Control Board ................................... 50
9. Rell Counter (S5 dip switch 2 through 5): "G" Control Board ............................... 50
D. Control Switch ............................................................................................................. 50
IV. Refrigeration Circuit and Component Service Information.............................................. 51
A. Refrigeration Circuit Service Information .................................................................... 51
B. Component Service Information.................................................................................. 54
C. Water Regulating Valve Adjustment (water-cooled model) .......................................... 54
V. Maintenance .................................................................................................................... 55
VI. Preparing the Appliance for Periods of Non-Use ............................................................ 56
VII. Disposal......................................................................................................................... 58
VIII. Technical Information.................................................................................................... 59
A. Specication Sheets.................................................................................................... 59
1. KM-320MAH........................................................................................................... 59
2. KM-320MWH ......................................................................................................... 60
3. KM-515MAH .......................................................................................................... 61
4. KM-515MWH ......................................................................................................... 62
5. KM-515MRH.......................................................................................................... 63
6. KM-600MAH .......................................................................................................... 64
7. KM-650MAH........................................................................................................... 65
8. KM-650MWH ......................................................................................................... 66
9. KM-650MWH-M..................................................................................................... 67
10. KM-650MRH ........................................................................................................ 68
11. KM-901MAH ......................................................................................................... 69
12. KM-901MWH ....................................................................................................... 70
13. KM-901MRH ........................................................................................................ 71
14. KM-901MRH3 ...................................................................................................... 72
B. Performance Data ....................................................................................................... 73
1. KM-320MAH .......................................................................................................... 73
2. KM-320MWH ..........................................................................................................74
3. KM-515MAH .......................................................................................................... 75
4. KM-515MWH ......................................................................................................... 76
5. KM-515MRH.......................................................................................................... 77
6. KM-600MAH .......................................................................................................... 78
7. KM-650MAH........................................................................................................... 79
8. KM-650MWH ......................................................................................................... 80
9. KM-650MWH-M..................................................................................................... 81
10. KM-650MRH ........................................................................................................ 82
11. KM-901MAH ......................................................................................................... 83
12. KM-901MWH ....................................................................................................... 84
13. KM-901MRH ........................................................................................................ 85
14. KM-901MRH3 ...................................................................................................... 86

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C. Wiring Diagrams ......................................................................................................... 87
1. Diagrams Without Harvest Pump Timer Relays ..................................................... 87
a) KM-320M_H, KM-515M_H, KM-600MAH ........................................................ 87
b) KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH ............................... 88
c) KM-650MRH, KM-901MRH.............................................................................. 89
d) KM-901MRH3 .................................................................................................. 90
2. Diagrams With Harvest Pump Timer Relays .......................................................... 91
a) KM-515MAH .................................................................................................... 91
b) KM-650MAH, KM-650MWH, KM-901MAH ...................................................... 92
c) KM-650MWH-M ............................................................................................... 93
d) KM-650MRH .................................................................................................... 94

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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. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage to the appliance.
• 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 severe damage to equipment.
• The appliance 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.
• Before servicing the appliance, move the control switch to the "OFF" position and
turn off the power supply. 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 with damp
hands.
• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, re, or damage to the unit.

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WARNING, continued
• 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.
• Children should be properly supervised around this appliance.
• Do not climb, stand, or hang on the appliance or allow children or animals to do so.
Serious injury could occur or the appliance could be damaged.
• Do not use combustible spray or place volatile or ammable substances near the
appliance. They might catch re.
• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.
Additional Warning for Remote Models
• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and
ground wire to the remote condenser unit are supplied from the icemaker. Failure to
properly ground the remote condenser unit could result in death or serious injury.
• Move the icemaker control switch to the "OFF" position and turn off the power
supply to the icemaker before servicing the remote condenser unit.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
NOTICE
• Follow the instructions in this manual carefully to reduce the risk of costly water
damage.
• In areas where water damage is a concern, install in a contained area with a oor
drain.
• Install the appliance in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).
• Do not leave the appliance on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the appliance for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."
• Do not place objects on top of the appliance.
• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in
the dispenser unit/ice storage bin.

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I. Construction and Water/Refrigeration Circuit Diagram
A. Construction
1. Air-Cooled Models (MAH)
Thermostatic
Bin Control
Water Supply Inlet
Condenser
Drier
Control Box
Spray Tubes
Control Switch
Water Pump
Float Switch
Compressor
Thermostatic
Expansion Valve
Fan Motor
Hot Gas Valve
Thermostatic Bin Control
Bracket & Bulb Holder
Cleaning Valve
Mechanical Bin Control and Bracket
Model Shown: KM-515MAH
Inlet Water Valve
Liquid Line Valve
KM-515MAH
High-Pressure
Switch

9
2. Water-Cooled Models (MWH(-M))
Water Supply Inlet
Condenser
Drier
Control Box
Spray Tubes
Control Switch
Water Pump
Float Switch
Compressor
Thermostatic
Expansion Valve
Water Regulating
Valve
Hot Gas Valve
Cleaning Valve
Thermostatic
Bin Control
Thermostatic Bin Control
Bracket & Bulb Holder
Mechanical Bin Control and Bracket
Model Shown: KM-515MWH
Inlet Water Valve
Liquid Line Valve
KM-320MWH and
KM-515MWH
High-Pressure Switch
Main Transformer
KM-650MWH-M

10
3. Remote Models (MRH/3)
Receiver Tank
Water Supply Inlet
Junction Boxes
Drier
Control Box
Spray Tubes
Control Switch
Water Pump
Float Switch
Compressor
Thermostatic
Expansion Valves
Hot Gas Valve
Liquid Line Valve
Cleaning Valve
Thermostatic
Bin Control
Thermostatic Bin Control
Bracket & Bulb Holder
Mechanical Bin Control and Bracket
Model Shown: KM-901MRH
Inlet Water Valve