Modular Crescent Cuber
SERVICE MANUAL
Models KM-320MAH, MWH
HoshizakiHoshizaki America, Inc
Phone 1-800-233-1940 770 Fax 1-800-843-1056 770
Complete and detailed explanation of the problem
E-mail techsupport@hoshizaki.com HOSHIZAKI AMERICA, INC
618 Highway 74 South Peachtree City, GA
CONTENTS
6. Factory Use S4 dip switch
5. Bin Control Selector or Harvest Pump Timer Operation S4 dip switch
7. Freeze Timer S4 dip switch 9
8. Float Switch Selector S5 dip switch 1 G Control Board
1. Diagrams Without Harvest Pump Timer Relays
C. Wiring Diagrams
2. Diagrams With Harvest Pump Timer Relays
a KM-320MH, KM-515MH, KM-600MAH
Indicates a hazardous situation which could result in death or
Important Safety Information
serious injury
Indicates a situation which could result in damage to the
Additional Warning for Remote Models
WARNING, continued
1. Air-Cooled Models MAH
I. Construction and Water/Refrigeration Circuit Diagram
A. Construction
Model Shown KM-515MWH
2. Water-Cooled Models MWH-M
Spray Tubes Inlet Water Valve Cleaning Valve Control Switch
3. Remote Models MRH/3
Thermostatic Bin Control Float Switch Water Pump Compressor
Thermostatic Bin Control Bracket & Bulb Holder
1. Air-Cooled Models MAH
B. Water/Refrigeration Circuit Diagram
Freeze Pump Out
2. Water-Cooled Models MWH-M
Discharge Line
Freeze Pump- Out
3. Remote Models MRH/3
E and G Control Board Without Harvest Pump Timer Operation Flow Chart
A. Sequence of Operation Flow Chart
II. Sequence of Operation and ServiceDiagnosis
Components Energized when the Control Switch is in the WASH Position
Mechanical Bin Control Shutdown Sequence Flow Chart
Thermostatic Bin Control Shutdown Sequence Flow Chart
Shutdown Delay
1. Bin Full
2. G Control Board with Harvest Pump
G Control Board With Harvest Pump Timer Operation Sequence Flow Chart
Timer Operation
Components Energized when the Control Switch is in the WASH Position
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
S4 Dip Switch Setting
G Control Board Settings
Pump-Out
G Control Board
9 Shutdown Mechanical Bin Control
C. Control Board Check
1. Thermostatic Bin Control Check
D. Bin Control Check
5 Disconnect MBC connector from CB K4 connector
4 Check MBC wire harness connections. See Fig
9 Check that CB green BC CLOSED LED is on
Legend MBC-mechanical bin control CB-control board
b Mechanical Bin Control Cleaning
1. Float Switch Check
E. Float Switch Check and Cleaning
and Hose
2. Float Switch Cleaning
Vent Flush Shaft Float Switch Housing Float Retainer Rod Rubber Boot
F. Thermistor Check
No Ice Production - Possible Cause
G. Diagnostic Tables
1. No Ice Production
No Ice Production - Possible Cause
2. Freeze-Up
Freeze-Up - Possible Cause
Harvest Cycle
Freeze-Up - Possible Cause
3. Low Ice Production
Freeze Cycle
Low Ice Production - Possible Cause
Long Freeze Cycle
Low Ice Production - Possible Cause
III. Controls and Adjustments
E Control Board
A. Control Board Layout
1. E Control Board
E Control Board
2. G Control Board
G Control Board
G Control Board
Part Number 2A3792-01
1. E Control Board
B. LED Lights and Audible Alarm Safeties
2. G Control Board
1. Default Dip Switch Settings
C. Settings and Adjustments
a E and G Control Board without Harvest Pump Timer Operation
b G Control Board with 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
7. Freeze Timer S4 dip switch 9
2 Harvest Pump Timer, G Control Board
6. Factory Use S4 dip switch
9. Refill Counter S5 dip switch 2 through 5 G Control Board
D. Control Switch
8. Float Switch Selector S5 dip switch 1 G Control Board
1. Refrigerant Recovery
IV. Refrigeration Circuit and Component Service Information
A. Refrigeration Circuit Service Information
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
2. Remove the water from the water tank
VI. Preparing the Appliance for Periods of Non-Use
1. Remove the water from the icemaker water line
6 Close the drain valves
VII. Disposal
design
VIII. Technical Information A. Specification Sheets
1. KM-320MAH
design without
2. KM-320MWH
Note We reserve the right to make changes in specifications and
3. KM-515MAH
without prior
design
Note We reserve the right to make changes in specifications
4. KM-515MWH
and design
without prior
5. KM-515MRH
Note We reserve the right to make changes in specifications
6. KM-600MAH
and design
without prior
Note We reserve the right to make changes in specifications and
7. KM-650MAH
without prior
design
and design without prior
8. KM-650MWH
Note We reserve the right to make changes in specifications
9. KM-650MWH-M
AWAITING DATA
Note We reserve the right to make changes in specifications
10. KM-650MRH
and design
without prior
design
11. KM-901MAH
Note We reserve the right to make changes in specifications
12. KM-901MWH
and design
without prior
without prior
13. KM-901MRH
without prior
14. KM-901MRH3
1. KM-320MAH
B. Performance Data
AMBIENT TEMP
kg./day
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
a KM-320MH, KM-515MH, KM-600MAH
C. Wiring Diagrams
1. Diagrams Without Harvest Pump Timer Relays
PSIG
b KM-650MAH, KM-650MWH, KM-901MAH, KM-901MWH
Control utputO
PressureSwitch
c KM-650MRH, KM-901MRH
Transformer 10.5V at115V
Control Output
High-Pressure Switch
d KM-901MRH3
Control Transformer Output 10.5V at
Cut-out
a KM-515MAH
2. Diagrams With Harvest Pump Timer Relays
Output
C ontrol
901MAH
b KM-650MAH, KM-650MWH, KM
Control Transformer
Output 10.5V at
Control Transformer Output 10.5V at High-Pressure Switch
c KM-650MWH-M
Cut-out
384±
d KM-650MRH
High-Pressure Switch
Control Transformer
Output 10.5V at