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