HoshizakiHoshizaki America, Inc
SERVICE MANUAL
Modular Crescent Cuber
Models KM-320MAH, MWH
618 Highway 74 South Peachtree City, GA
Complete and detailed explanation of the problem
Phone 1-800-233-1940 770 Fax 1-800-843-1056 770
E-mail techsupport@hoshizaki.com HOSHIZAKI AMERICA, INC
CONTENTS
8. Float Switch Selector S5 dip switch 1 G Control Board
5. Bin Control Selector or Harvest Pump Timer Operation S4 dip switch
6. Factory Use S4 dip switch
7. Freeze Timer S4 dip switch 9
a KM-320MH, KM-515MH, KM-600MAH
C. Wiring Diagrams
1. Diagrams Without Harvest Pump Timer Relays
2. Diagrams With Harvest Pump Timer Relays
Indicates a situation which could result in damage to the
Important Safety Information
Indicates a hazardous situation which could result in death or
serious injury
Additional Warning for Remote Models
WARNING, continued
A. Construction
I. Construction and Water/Refrigeration Circuit Diagram
1. Air-Cooled Models MAH
Model Shown KM-515MWH
2. Water-Cooled Models MWH-M
Thermostatic Bin Control Bracket & Bulb Holder
3. Remote Models MRH/3
Spray Tubes Inlet Water Valve Cleaning Valve Control Switch
Thermostatic Bin Control Float Switch Water Pump Compressor
1. Air-Cooled Models MAH
B. Water/Refrigeration Circuit Diagram
Discharge Line
2. Water-Cooled Models MWH-M
Freeze Pump Out
Freeze Pump- Out
3. Remote Models MRH/3
Components Energized when the Control Switch is in the WASH Position
A. Sequence of Operation Flow Chart
E and G Control Board Without Harvest Pump Timer Operation Flow Chart
II. Sequence of Operation and ServiceDiagnosis
1. Bin Full
Thermostatic Bin Control Shutdown Sequence Flow Chart
Mechanical Bin Control Shutdown Sequence Flow Chart
Shutdown Delay
Components Energized when the Control Switch is in the WASH Position
G Control Board With Harvest Pump Timer Operation Sequence Flow Chart
2. G Control Board with Harvest Pump
Timer Operation
B. Service Diagnosis
1. E and G Control Board without Harvest Pump Timer Diagnosis
If energized, replace CB. If de-energized and bypassing, replace LLV
a Freeze Cycle Diagnosis Confirm Comp and FMR continue. Confirm that
For LLV, check coil voltage and continuity
CB K1 #5 DBU to neutral W. If 115VAC is not present, replace CB
b Mechanical Bin Control
9 Shutdown a E Control Board Thermostatic Bin Control TBC
2. G Control Board with Harvest Pump Timer Diagnosis
d WRV Diagnosis Confirm WRV is not leaking by
50 sec. before harvest terminates, PM energizes. See step 5b below
Page
For LLV, check coil voltage and continuity
G Control Board
G Control Board Settings
S4 Dip Switch Setting
Pump-Out
9 Shutdown Mechanical Bin Control
C. Control Board Check
1. Thermostatic Bin Control Check
D. Bin Control Check
Legend MBC-mechanical bin control CB-control board
4 Check MBC wire harness connections. See Fig
5 Disconnect MBC connector from CB K4 connector
9 Check that CB green BC CLOSED LED is on
b Mechanical Bin Control Cleaning
1. Float Switch Check
E. Float Switch Check and Cleaning
Vent Flush Shaft Float Switch Housing Float Retainer Rod Rubber Boot
2. Float Switch Cleaning
and Hose
F. Thermistor Check
1. No Ice Production
G. Diagnostic Tables
No Ice Production - Possible Cause
Harvest Cycle
2. Freeze-Up
No Ice Production - Possible Cause
Freeze-Up - Possible Cause
Low Ice Production - Possible Cause
3. Low Ice Production
Freeze-Up - Possible Cause
Freeze Cycle
Long Freeze Cycle
Low Ice Production - Possible Cause
III. Controls and Adjustments
E Control Board
A. Control Board Layout
E Control Board
1. E Control Board
Part Number 2A3792-01
G Control Board
2. G Control Board
G Control Board
1. E Control Board
B. LED Lights and Audible Alarm Safeties
2. G Control Board
b G Control Board with Harvest Pump Timer Operation
C. Settings and Adjustments
1. Default Dip Switch Settings
a E and G Control Board without Harvest Pump Timer Operation
3. Pump-Out Timer S4 dip switch 3
2. Harvest Timer S4 dip switch 1
1 Bin Control Selector, E Control Board
4. Pump-Out Frequency Control S4 dip switch 5
6. Factory Use S4 dip switch
2 Harvest Pump Timer, G Control Board
7. Freeze Timer S4 dip switch 9
8. Float Switch Selector S5 dip switch 1 G Control Board
D. Control Switch
9. Refill Counter S5 dip switch 2 through 5 G Control Board
A. Refrigeration Circuit Service Information
IV. Refrigeration Circuit and Component Service Information
1. Refrigerant Recovery
3. Evacuation and Recharge R-404A
2. Brazing
10 Cap the refrigerant access valves to prevent a possible leak
C. Water Regulating Valve Adjustment water-cooled model
B. Component Service Information
V. Maintenance
1. Remove the water from the icemaker water line
VI. Preparing the Appliance for Periods of Non-Use
2. Remove the water from the water tank
6 Close the drain valves
VII. Disposal
1. KM-320MAH
VIII. Technical Information A. Specification Sheets
design
design without
2. KM-320MWH
design
3. KM-515MAH
Note We reserve the right to make changes in specifications and
without prior
without prior
4. KM-515MWH
Note We reserve the right to make changes in specifications
and design
5. KM-515MRH
without prior
6. KM-600MAH
Note We reserve the right to make changes in specifications
and design
design
7. KM-650MAH
Note We reserve the right to make changes in specifications and
without prior
Note We reserve the right to make changes in specifications
8. KM-650MWH
and design without prior
9. KM-650MWH-M
AWAITING DATA
without prior
10. KM-650MRH
Note We reserve the right to make changes in specifications
and design
design
11. KM-901MAH
without prior
12. KM-901MWH
Note We reserve the right to make changes in specifications
and design
without prior
13. KM-901MRH
without prior
14. KM-901MRH3
kg./day
B. Performance Data
1. KM-320MAH
AMBIENT TEMP
2. KM-320MWH
3. KM-515MAH
4. KM-515MWH
5. KM-515MRH
6. KM-600MAH
7. KM-650MAH
8. KM-650MWH
9. KM-650MWH-M
AWAITING DATA
10. KM-650MRH
11. KM-901MAH
12. KM-901MWH
13. KM-901MRH
14. KM-901MRH3
1. Diagrams Without Harvest Pump Timer Relays
C. Wiring Diagrams
a KM-320MH, KM-515MH, KM-600MAH
Control utputO
b KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH
PSIG
Control Output
c KM-650MRH, KM-901MRH
PressureSwitch
Transformer 10.5V at115V
Cut-out
d KM-901MRH3
High-Pressure Switch
Control Transformer Output 10.5V at
C ontrol
2. Diagrams With Harvest Pump Timer Relays
a KM-515MAH
Output
Output 10.5V at
b KM-650MAH, KM-650MWH, KM
901MAH
Control Transformer
384±
c KM-650MWH-M
Control Transformer Output 10.5V at High-Pressure Switch
Cut-out
Output 10.5V at
High-Pressure Switch
d KM-650MRH
Control Transformer