Hoshizaki KM-201BAH User manual

SERVICE MANUAL
HOSHIZAKI
SELF-CONTAINED
CRESCENT CUBER
MODEL KM-201BAH
KM-260BAH
KM-201BWH
KM-260BWH
NO. F015-774
ISSUED: MAR. 18, 2009
REVISED: JUN. 17, 2011

IMPORTANT
Only qualified service technicians should install, service or maintain
the product. No service or maintenance should be undertaken until the
technician has thoroughly read this Service Manual. Failure to service and
maintain the equipment in accordance with this manual may adversely
affect safety, performance, and warranty coverage.
Hoshizaki provides this manual primarily to assist qualified service technicians in the
maintenance and service of the product.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, write, or send an e-mail message to the Hoshizaki Technical
Support Department for assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Phone: [phone] Technical Support
[phone]
Fax: [phone]
[phone]
E-mail: [email protected]
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.

IMPORTANT
This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians
should install, service, and maintain the icemaker. Read the warnings
contained in this booklet carefully as they give important information
regarding safety. Please retain this booklet for any further reference that may
be necessary.
CONTENTS PAGE
I. SPECIFICATIONS -------------------------------------------------------------------------------------1
1. SPECIFICATIONS----------------------------------------------------------------------------------1
[a] KM-201BAH -------------------------------------------------------------------------------------1
[b] KM-260BAH -------------------------------------------------------------------------------------2
[c] KM-201BWH-------------------------------------------------------------------------------------3
[d] KM-260BWH ------------------------------------------------------------------------------------4
II. GENERAL INFORMATION -------------------------------------------------------------------------5
1. CONSTRUCTION----------------------------------------------------------------------------------5
[a] KM-201BAH, KM-260BAH-------------------------------------------------------------------5
[b] KM-201BWH ------------------------------------------------------------------------------------6
[c] KM-260BWH-------------------------------------------------------------------------------------7
[d] ICEMAKING COMPARTMENT-------------------------------------------------------------8
2. SEQUENCE OF OPERATION ------------------------------------------------------------------9
[a] ONE MINUTE FILL CYCLE------------------------------------------------------------------9
[b] INITIAL HARVEST CYCLE ------------------------------------------------------------------9
[c] FREEZE CYCLE -------------------------------------------------------------------------------9
[d] PUMP-OUT CYCLE ---------------------------------------------------------------------------9
[e] NORMAL HARVEST CYCLE -------------------------------------------------------------10
[f] SHUTDOWN ----------------------------------------------------------------------------------10
3. CONTROL BOARD ------------------------------------------------------------------------------12
[a] CONTROL BOARD LAYOUT -------------------------------------------------------------13
[b] FEATURES ------------------------------------------------------------------------------------14
[c] CONTROLS AND ADJUSTMENTS------------------------------------------------------16
[d] CONTROL BOARD CHECK PROCEDURE-------------------------------------------21
[e] CONTROL BOARD REPLACEMENT---------------------------------------------------22
4. THERMISTOR-------------------------------------------------------------------------------------22
5. BIN CONTROL------------------------------------------------------------------------------------23
[a] EXPLANATION OF OPERATION--------------------------------------------------------23
[b] BIN CONTROL CHECK PROCEDURE ------------------------------------------------23
6. SWITCHES ----------------------------------------------------------------------------------------24
[a] CONTROL SWITCH-------------------------------------------------------------------------24
[b] SERVICE SWITCH--------------------------------------------------------------------------24
III. TECHNICAL INFORMATION--------------------------------------------------------------------26
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT---------------------------------------26
i

[a] KM-201BAH, KM-260BAH-----------------------------------------------------------------26
[b] KM-201BWH, KM-260BWH ---------------------------------------------------------------27
2. WIRING DIAGRAM ------------------------------------------------------------------------------28
3. TIMING CHART-----------------------------------------------------------------------------------29
[a] KM-201BAH -----------------------------------------------------------------------------------29
[b] KM-260BAH -----------------------------------------------------------------------------------30
[c] KM-201BWH-----------------------------------------------------------------------------------31
[d] KM-260BWH ----------------------------------------------------------------------------------32
4. PERFORMANCE DATA-------------------------------------------------------------------------33
[a] KM-201BAH -----------------------------------------------------------------------------------33
[b] KM-260BAH -----------------------------------------------------------------------------------34
[c] KM-201BWH-----------------------------------------------------------------------------------35
[d] KM-260BWH ----------------------------------------------------------------------------------36
IV. SERVICE DIAGNOSIS----------------------------------------------------------------------------37
1. DIAGNOSTIC PROCEDURE------------------------------------------------------------------37
2. NO ICE PRODUCTION-------------------------------------------------------------------------39
3. EVAPORATOR IS FROZEN UP--------------------------------------------------------------42
4. LOW ICE PRODUCTION-----------------------------------------------------------------------43
5. ABNORMAL ICE---------------------------------------------------------------------------------- 43
6. OTHER----------------------------------------------------------------------------------------------44
V. REMOVALAND REPLACEMENT --------------------------------------------------------------45
1. SERVICE FOR REFRIGERANT LINES ----------------------------------------------------45
[a] SERVICE INFORMATION -----------------------------------------------------------------45
[b] REFRIGERANT RECOVERY-------------------------------------------------------------46
[c] EVACUATION AND RECHARGE (R-404A) -------------------------------------------46
2. BRAZING-------------------------------------------------------------------------------------------47
3. COMPRESSOR-----------------------------------------------------------------------------------48
4. DRIER-----------------------------------------------------------------------------------------------49
5. HOT GAS VALVE---------------------------------------------------------------------------------50
6. EXPANSION VALVE-----------------------------------------------------------------------------52
7. AIR-COOLED CONDENSER------------------------------------------------------------------53
8. WATER-COOLED CONDENSER ------------------------------------------------------------54
9. FAN MOTOR (AIR-COOLED MODEL)------------------------------------------------------55
10. WATER REGULATING VALVE (WATER-COOLED MODEL)-------------------------56
11. ADJUSTMENT OF WATER REGULATING VALVE
(WATER-COOLED MODEL) -------------------------------------------------------------------58
12. PUMP MOTOR------------------------------------------------------------------------------------59
13. WATER VALVE------------------------------------------------------------------------------------60
14. DRAIN VALVE, CLEANING VALVE----------------------------------------------------------61
15. FLOAT SWITCH----------------------------------------------------------------------------------62
16. BIN CONTROL SWITCH-----------------------------------------------------------------------63
17. THERMISTOR ------------------------------------------------------------------------------------64
18. CONTROL BOX ----------------------------------------------------------------------------------65
[a] POWER SWITCH----------------------------------------------------------------------------66
[b] FUSE--------------------------------------------------------------------------------------------66
ii

[c] FUSE HOLDER-------------------------------------------------------------------------------66
[d] CONTROL BOARD--------------------------------------------------------------------------66
[e] POWER RELAY ------------------------------------------------------------------------------66
[f] CONTROL BOARD TRANSFORMER--------------------------------------------------67
19. WATER TANK-------------------------------------------------------------------------------------67
20. CUBE GUIDE -------------------------------------------------------------------------------------68
21. SEPARATOR--------------------------------------------------------------------------------------68
22. SPRAY TUBE, WATER SUPPLY PIPE, SPRAY GUIDE -------------------------------70
23. DOOR-----------------------------------------------------------------------------------------------71
VI. CLEANING AND MAINTENANCE INSTRUCTIONS--------------------------------------72
1. CLEANING-----------------------------------------------------------------------------------------72
[a] CLEANING PROCEDURE-----------------------------------------------------------------72
[b] SANITIZING PROCEDURE---------------------------------------------------------------73
2. MAINTENANCE ----------------------------------------------------------------------------------74
[a] EXTERIOR PANELS ------------------------------------------------------------------------74
[b] STORAGE BINAND SCOOP-------------------------------------------------------------74
[c] AIR FILTER (AIR-COOLED MODEL) ---------------------------------------------------75
[d] CONDENSER (AIR-COOLED MODEL)------------------------------------------------75
3. PREPARING THE ICEMAKER FOR LONG STORAGE--------------------------------75
iii

1
I. SPECIFICATIONS
1. SPECIFICATIONS
[a] KM-201BAH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 6.1 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MAXIMUM FUSE SIZE N/A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *201 (91) 190 (86) 176 (80)
Reference without *marks 80 193 (88) 177 (80) 162 (73)
90 190 (86) *165 (75) 150 (68)
100 187 (85) 161 (73) *136 (62)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 4.0lbs. (1.82 kg) 182pcs.
APPROXIMATE STORAGE CAPACITY 80 lbs(36Kg).
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 510(7.5) 490(5.8)
WATER gal./24HR (gal./100 lbs.) 36(22.0) 72(35.6)
CEC/CEE TIER LEVEL 3
ENERGY STAR Yes
EXTERIOR DIMENSIONS (WxDxH) 24" x 28" x 39" (612 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 137 lbs. (62 kg), Shipping 165 lbs. (75 kg)
CONNECTIONS - ELECTRIC Cord Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Level Switch with Delay
COMPRESSOR Hermetic, Model NF7CLX
CONDENSER Air-Cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 12 oz. (340g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 372022
We reserve the right to make changes in specifications and design without prior notice.

2
[b] KM-260BAH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 7.6 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MAXIMUM FUSE SIZE N/A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *263 (119) 245 (111) 227 (103)
Reference without *marks 80 249 (113) 220 (100) 207 (94)
90 245 (111) *200 (91) 185 (84)
100 244 (111) 196 (89) *171 (78)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 5.0.lbs. (2.26kg) 238 pcs.
APPROXIMATE STORAGE CAPACITY 100 lbs(45Kg).
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 630(7.6) 590(5.4)
WATER gal./24HR (gal./100 lbs.) 41(20.3) 78(29.7)
CEC/CEE TIER LEVEL 3
ENERGY STAR Yes
EXTERIOR DIMENSIONS (WxDxH) 30" x 28" x 39" (762 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. (70 kg), Shipping 187 lbs. (85 kg)
CONNECTIONS - ELECTRIC Cord Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Level Switch with Delay
COMPRESSOR Hermetic, Model SC10CL
CONDENSER Air-Cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A 12.7oz (360g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 372021
We reserve the right to make changes in specifications and design without prior notice.

3
[c] KM-201BWH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 5.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MAXIMUM FUSE SIZE N/A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *215 (98) 205 (93) 192 (87)
Reference without *marks 80 207 (94) 192 (87) 180 (82)
90 205 (93) *181 (82) 168 (76)
100 203 (92) 178 (81) *157 (71)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 4.0lbs. (1.82 kg) 182pcs.
APPROXIMATE STORAGE CAPACITY 80 lbs(36Kg).
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 470(6.17) 460(5.08)
WATER gal./24HR (gal./100 lbs.) 43(24.0) 55(25.6)
COND.WATER gal./24HR (gal./100 lbs) 226(141.3) 119(55.6)
CEC/CEE TIER LEVEL 3
EXTERIOR DIMENSIONS (WxDxH) 24" x 28" x 39" (612 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 137 lbs. (62 kg), Shipping 165 lbs. (75 kg)
CONNECTIONS - ELECTRIC Cord Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
CONDENSER WATER Inlet 1/2" FPT
Outlet 1/2" FPT
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Level Switch with Delay
COMPRESSOR Hermetic, Model NF7CLX
CONDENSER Water-Cooled, Tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 9.9 oz. (280g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 373568S01
We reserve the right to make changes in specifications and design without prior notice.

4
[d] KM-260BWH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MAXIMUM FUSE SIZE N/A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *268 (122) 259 (117) 242 (110)
Reference without *marks 80 261 (118) 247 (112) 228 (103)
90 259 (117) *237 (108) 218 (99)
100 254 (115) 233 (106) *201 (91)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 5.0.lbs. (2.26kg) 238 pcs.
APPROXIMATE STORAGE CAPACITY 100 lbs(45Kg).
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 630(6.37) 620(5.59)
WATER gal./24HR (gal./100 lbs.) 62(26.3) 77(28.7)
COND.WATER gal./24HR (gal./100 lbs) 285(120.6) 151(56.2)
CEC/CEE TIER LEVEL 3
EXTERIOR DIMENSIONS (WxDxH) 30" x 28" x 39" (762 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. (70 kg), Shipping 187 lbs. (85 kg)
CONNECTIONS - ELECTRIC Cord Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
CONDENSER WATER Inlet 1/2" FPT
Outlet 1/2" FPT
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Mechanical Level Switch with Delay
COMPRESSOR Hermetic, Model SC10CL
CONDENSER Water-Cooled, Tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A 12.7oz (360g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 373569S01
We reserve the right to make changes in specifications and design without prior notice.

5
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-201BAH, KM-260BAH
Top Panel
Side Panel (L)
Front Cover
Rear Panel
Door
Air Filter
Louver
Leg
Side Panel (R) Power Supply Cord
Top Cover Hot Gas Valve Thermistor
Drain Valve
Evaporator Condenser
Fan Motor Cleaning Valve
Separator Compressor
Water Tank Water Valve
Expansion Float Switch
Valve
Overflow Pipe Drier
Pump Motor
Control Switch
Service Switch
Control Box
Front View Rear View
Bin Control Switch
With Tank Removed

6
[b] KM-201BWH
Top Panel
Side Panel (L)
Front Cover
Rear Panel
Door
Side Panel (R)
Louver Power Supply Cord
Leg
Top Cover Drain Valve Hot Gas Valve
Cleaning Valve Thermistor
Water Regulator Evaporator Condenser
Separator Compressor
Water Tank Water Valve
Expansion
Valve Float Switch
Overflow Pipe
Drier
Control Switch
Service Switch
Control Box
Front View Rear View
Bin Control Switch
With Tank Removed

7
[c] KM-260BWH
Top Panel
Front Cover
Side Panel (L) Rear Panel
Door
Side Panel (R)
Louver Power Supply Cord
Leg
Top Cover Drain Valve Hot Gas Valve Thermistor
Cleaning Valve
Water Regulator
Evaporator
Condenser
Separator
Water Tank
Compressor
Expansion
Valve Water Valve
Overflow Pipe
Drier
Control Switch Float Switch
Service Switch
Control Box
Front View Rear View
Bin Control Switch
With Tank Removed

8
[d] ICEMAKING COMPARTMENT
Spray Tube
Evaporator
Water Supply Pipe
Separator
Cube Guide
Water Tank
Overflow Pipe
Drain Valve
Cleaning Valve Separator
Water Valve
Pump Motor
Float Switch

9
2. SEQUENCE OF OPERATION
The steps in the sequence are as outlined below. When power is supplied, a 5 second
delay occurs at startup. Note that the order of the LEDs from the outer edge of the board
is 5, 6, 8, 9, 4, 7.
[a] ONE MINUTE FILL CYCLE
LED 8 is on. WV opens and the fill period begins. After 1 minute, the board checks for
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain energized
through additional 1 minute cycles until water enters the sump and F/S closes. This
serves as a low water safety to protect the pump motor.
[b] INITIAL HARVEST CYCLE
LEDs 5, 6, and 8 are on. WV remains open, Comp energizes, HGV opens, and harvest
begins. As the evaporator warms, the thermistor located on the suction line checks for a
48°F (9°C) temperature. When 48°F (9°C) is reached, a 3.9 ksignal turns the harvest
over to the adjustable harvest timer which is factory set for normal conditions. The timer
has settings of 60, 90, 120, and 180 seconds (S1 dip switch 1 & 2). When the harvest
timer completes its count down, the harvest cycle is complete and the freeze cycle
starts. The minimum total time allowed by the board for a complete harvest cycle is 2
minutes. WV is open during harvest for a maximum of 6 minutes or the length of harvest
minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter.
LED 8 goes off when WV closes. PM energizes and runs for the last 0, 10, 30, or 50
seconds of harvest depending on S1 dip switch 7 & 8 setting. LED 7 comes on when
PM energizes. At the end of harvest, the control board checks the position of F/S and
proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.
[c] FREEZE CYCLE
LEDs 5 & 7 are on. Comp continues to run, PM and FMS energize, HGV closes and the
freeze cycle starts. For the first 5 minutes after the thermistor temperature reaches 36°F
(2°C), the control board will not accept a signal from F/S. This minimum freeze period
acts as a short cycle protection. At the end of this period, F/S assumes control. As the
evaporator cools, the thermistor located on the suction line checks the temperature and
PM stops (see “III. 3. TIMING CHART” for details). This is to prevent slushing. As ice
builds on the evaporator the water level in the sump lowers. The freeze continues until
F/S opens and terminates ice production.
[d] PUMP-OUT CYCLE
LEDs 4, 5, 6, and 7 are on. Comp continues to run, HGV opens, FMS de-energizes.
PM stops for 2 seconds, DV energizes, then restarts to take water from the sump and
force it through DV and down the drain. When the drain timer stops counting, the drain
is complete. The drain timer has settings of 10 and 20 seconds (S1 dip switch 3 & 4).
Pump-out cycle always occurs on the 2nd harvest after startup. Then, depending on

10
the control board setting, pump-out cycle occurs every cycle, or every 2nd, 5th, or 10th
cycle (S1 dip switch 5 & 6).
[e] NORMAL HARVEST CYCLE
LEDs 5, 6, and 8 are on. Comp continues to run, HGV remains open and WV opens.
As the evaporator warms, the thermistor reaches 48°F (9°C). The control board then
receives the thermistor's 3.9 ksignal and starts the harvest timer. WV is open during
harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50
seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when
WV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of harvest
depending on S1 dip switch 7 & 8 setting. LED 7 comes on when PM energizes. At the
end of harvest, the control board checks the position of F/S and proceeds to the freeze
cycle if it is closed or calls for a 1-minute fill if it is open.
The unit continues to cycle through [c], [d], and [e] sequence until the bin control is
activated and shuts the unit down. When the bin control is activated, the “POWER OK”
LED flashes.
[f] SHUTDOWN
When BC is activated (BC open), the “POWER OK” LED flashes. There is a delay
before the shutdown sequence begins. The delay varies depending on the cycle the
icemaker is in at the time of activation. For details, see the table below.
Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins
Fill Cycle 15 seconds
Harvest Cycle 15 seconds after the next freeze cycle starts
Freeze Cycle 15 seconds if BC is activated between the beginning of
freeze and termination of the 5-minute short cycle protection
timer (timer starts when the thermistor temperature drops to
36°F (2°C) (5.5 kor more)). After this time, the unit will not
shut down until the next harvest cycle is complete.
After the delay, all components de-energize. DV energizes after 2 seconds. PM
energizes after 2 seconds. PM takes water from the tank and forces it through DV and
down the drain. The water tank drains for a maximum of 5 minutes or until F/S opens.
DV and PM (if applicable) then de-energize. When BC closes again calling for ice, the
unit starts at the 1-minute fill cycle. There is a 90-second minimum off time before the
icemaker can restart.
Legend: BC–bin control; Comp–compressor; DV–drain valve; FMS–self-contained fan
motor; F/S–float switch; HGV–hot gas valve; PM–pump motor; WV–inlet water
valve

11
Components Energized when the Control Switch is in the “SERVICE” Position When in the “SERVICE” position, the control switch supplies power to the service switch and the machine is in service mode. The service switch has three positions: “DRAIN”, “CIRCULATE”, and “WASH”. See the information below for details of each function.
DRAIN Power is supplied to the pump and drain valve. This drains the water tank. CIRCULATE Power is supplied to the pump only. This operation can be used to circulate cleaner for
extended periods of time over the outside surface of the evaporator.
WASH Power is supplied to the pump and cleaning valve. This operation is used to circulate cleaner
and sanitizer over both the insde and outside surfaces of the evaporator.

12
3. CONTROL BOARD
* A HOSHIZAKI exclusive solid-state control is employed in crescent cubers.
* All models are pretested and factory-adjusted.
CAUTION
1. Fragile, handle very carefully.
2. A control board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the
metal part of the unit before handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the
board to prevent damage to the board.
4. Do not change wiring and connections.
5. Always replace the whole board assembly if it goes bad.
6. Do not short out the power supply to test for voltage.

13
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(FM off when LED on)
Power Relay
Control Board
Auxiliary Code V0 or Earlier V1 or Later
Part Number P00013-02 P01771-02
Type HKM2006V003

14
[b] FEATURES
a) Maximum Water Supply Period - 6 minutes
The inlet water valve will be open during harvest for 6 minutes or the length of harvest
minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter.
b) Harvest Backup Timer and Freeze Timer
The harvest backup timer shuts down the icemaker if, for two cycles in a row, the
harvest cycle takes more than 20 minutes to complete. The control board will signal this
problem using 2 beeps every 3 seconds.
The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle
takes longer than the time specified to complete. The control board will signal this
problem using 3 beeps every 3 seconds. The time is factory set using S1 dip switch 9 &
10.
The alarm reset button on the control board must be pressed with power on to reset
either of these safeties.
c) High Temperature Safety
The temperature of the suction line in the refrigeration circuit is limited by the high
temperature safety. This protects the unit from excessively high temperatures. If the
evaporator temperature rises above 127°F (53°C) ± 7°F (4°C), the thermistor operates
the safety. This shuts down the circuit and the icemaker automatically stops.
The control board will signal this problem using 1 beep every 3 seconds. The alarm
reset button on the control board must be pressed with power on to reset the safety.
d) Low Water Safety
The control board checks the position of the float switch at the end of the initial one
minute water fill cycle and at the end of each harvest cycle.
If the float switch is in the up position (electrical circuit closed), the control board
changes to the next cycle. If the float switch is in the down position (electrical circuit
open), the control board changes to additional one minute water fill cycles until water
enters the sump and the float switch closes. When the float switch closes, the control
board changes to the next cycle. The unit will not start without adequate water in the
sump. This serves as a low water safety to protect the water pump.
For water-cooled model, if the condenser water supply is shut off, the unit is protected
by the high-pressure switch.
e) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by
the high voltage and low voltage cut-outs.
If miswiring (especially on single phase 3 wire models) causes excessive voltage (147Vac
± 5% or more) on the control board, the high voltage cut-out shuts down the circuit in 3

15
seconds and the icemaker automatically stops. The control board will signal this problem
using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insufficient voltage (92Vac ± 5% or
less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
f) LED Lights and Audible Alarm Safeties
The control board includes LED indicator lights, audible alarm safeties, and an output
test feature. The “POWER OK” LED indicates control voltage and will remain on unless
a control voltage problem occurs. The “POWER OK” LED flashes continuously when the
bin is full and DV energizes for a maximum of 5 minutes to drain the water tank.
At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 energize
and sequence from initial startup as listed in the table below. Note that the order of the
LEDs from the outer edge of the board is 5, 6, 8, 9, 4, 7. For more information, see “2.
SEQUENCE OF OPERATION”.
Sequence Step LED Energized
Components
Time LEDs are On
Min. Max. Avg.
1 Minute Fill Cycle 8 WV 60 seconds
Harvest Cycle 5, 6, 8 WV, HGV,
Comp 2 minutes 20 minutes 3 to 5 minutes
Last 0, 10, 30, or 50 seconds (adjustable by dip switch) of harvest, WV de-energizes
and PM energizes (LEDs 5, 6, and 7 are on)
Freeze Cycle 5, 7 Comp, PM,
FMS 5 minutes freeze timer setting 25 to 30 minutes
Pump-Out Cycle 5, 6, 4, 7 Comp, HGV,
DV, PM 10 seconds 20 seconds factory default setting
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.) Type of Alarm Notes
1
High Evaporator Temp.
(temperature > 127°F (53°C))
Check for harvest problem (stuck HGV or
relay), hot water entering unit, stuck HM, or
shorted thermistor.
2
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check for open thermistor, HGV not
opening, TXV leaking by, low charge,
inefficient Comp, or WRV leaking by.
3
Freeze Timer
(freeze > specified setting for
two cycles in a row)
Timer is factory set using S1
dip switch 9 & 10
Check for a float switch stuck closed (up),
WV leaking by, HGV leaking by, PM not
pumping, TXV not feeding properly, low
charge, or inefficient Comp.
To reset the above safeties, press the “ALARM RESET”button with the power supply
on.