Hoshizaki KM-61BAH User manual

SERVICE MANUAL
HOSHIZAKI
SELF-CONTAINED
CRESCENT CUBER
MODEL KM-61BAH
KM-101BAH
KM-151BAH
KM-151BWH
NO. M006-749
ISSUED: FEB. 18, 2008
REVISED: JUN. 17, 2011

IMPORTANT
Only qualified service technicians should install, service, and maintain the
unit. 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, component life, and warranty coverage.
Hoshizaki provides this manual primarily to assist qualified service technicians in the
maintenance and service of the unit.
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-61BAH---------------------------------------------------------------------------------------1
[b] KM-101BAH -------------------------------------------------------------------------------------2
[c] KM-151BAH -------------------------------------------------------------------------------------3
[d] KM-151BWH ------------------------------------------------------------------------------------4
II. GENERAL INFORMATION -------------------------------------------------------------------------5
1. CONSTRUCTION----------------------------------------------------------------------------------5
[a] KM-61BAH, KM-101BAH---------------------------------------------------------------------5
[b] KM-151BAH -------------------------------------------------------------------------------------6
[c] KM-151BWH-------------------------------------------------------------------------------------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] DRAIN CYCLE--------------------------------------------------------------------------------10
[e] NORMAL HARVEST CYCLE -------------------------------------------------------------10
3. CONTROL BOARD ------------------------------------------------------------------------------12
[a] CONTROL BOARD LAYOUT -------------------------------------------------------------13
[b] FEATURES ------------------------------------------------------------------------------------14
[c] CONTROLS AND ADJUSTMENTS------------------------------------------------------16
[d] CONTROL BOARD CHECK PROCEDURE-------------------------------------------18
[e] CONTROL BOARD REPLACEMENT---------------------------------------------------19
4. HARVEST CONTROL - THERMISTOR ----------------------------------------------------19
5. BIN CONTROL------------------------------------------------------------------------------------20
[a] EXPLANATION OF OPERATION--------------------------------------------------------20
[b] BIN CONTROL CHECK PROCEDURE ------------------------------------------------20
6. SWITCHES ----------------------------------------------------------------------------------------21
III. TECHNICAL INFORMATION--------------------------------------------------------------------22
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT---------------------------------------22
[a] KM-61BAH, KM-101BAH-------------------------------------------------------------------22
[b] KM-151BAH -----------------------------------------------------------------------------------23
i

[c] KM-151BWH-----------------------------------------------------------------------------------24
2. WIRING DIAGRAM ------------------------------------------------------------------------------25
[a] KM-61BAH-------------------------------------------------------------------------------------25
[b] KM-101BAH -----------------------------------------------------------------------------------26
[c] KM-151BAH, KM-151BWH ----------------------------------------------------------------27
3. TIMING CHART-----------------------------------------------------------------------------------28
4. PERFORMANCE DATA-------------------------------------------------------------------------29
[a] KM-61BAH-------------------------------------------------------------------------------------29
[b] KM-101BAH -----------------------------------------------------------------------------------30
[c] KM-151BAH -----------------------------------------------------------------------------------31
[d] KM-151BWH ----------------------------------------------------------------------------------32
IV. SERVICE DIAGNOSIS----------------------------------------------------------------------------33
1. 10-MINUTE DIAGNOSTIC PROCEDURE-------------------------------------------------33
2. NO ICE PRODUCTION-------------------------------------------------------------------------35
3. EVAPORATOR IS FROZEN UP--------------------------------------------------------------38
4. LOW ICE PRODUCTION-----------------------------------------------------------------------39
5. ABNORMAL ICE----------------------------------------------------------------------------------39
6. OTHER----------------------------------------------------------------------------------------------40
V. REMOVALAND REPLACEMENT --------------------------------------------------------------41
1. SERVICE FOR REFRIGERANT LINES ----------------------------------------------------41
[a] SERVICE INFORMATION -----------------------------------------------------------------41
[b] REFRIGERANT RECOVERY-------------------------------------------------------------42
[c] EVACUATION AND RECHARGE --------------------------------------------------------42
2. BRAZING-------------------------------------------------------------------------------------------43
3. COMPRESSOR-----------------------------------------------------------------------------------44
4. DRIER-----------------------------------------------------------------------------------------------45
5. HOT GAS VALVE---------------------------------------------------------------------------------46
6. EXPANSION VALVE - KM-151BAH, KM-151BWH ONLY------------------------------48
7. WATER REGULATING VALVE - KM-151BWH ONLY-----------------------------------50
8. ADJUSTMENT OF WATER REGULATING VALVE - KM-151BWH ONLY---------51
9. WATER-COOLED CONDENSER - KM-151BWH ONLY -------------------------------52
10. FAN MOTOR --------------------------------------------------------------------------------------54
11. PUMP MOTOR------------------------------------------------------------------------------------55
12. WATER VALVE------------------------------------------------------------------------------------56
13. CLEANING VALVE-------------------------------------------------------------------------------57
14. DRAIN VALVE-------------------------------------------------------------------------------------58
15. FLOAT SWITCH----------------------------------------------------------------------------------59
[a] KM-61BAH, KM-101BAH-------------------------------------------------------------------59
[b] KM-151BAH, KM-151BWH----------------------------------------------------------------60
16. BIN CONTROL SWITCH-----------------------------------------------------------------------61
17. THERMISTOR ------------------------------------------------------------------------------------64
18. CONTROL BOX ----------------------------------------------------------------------------------65
[a] POWER SWITCH----------------------------------------------------------------------------66
[b] FUSE--------------------------------------------------------------------------------------------66
[c] FUSE HOLDER-------------------------------------------------------------------------------66
ii

[d] CONTROL BOARD--------------------------------------------------------------------------66
[e] POWER RELAY ------------------------------------------------------------------------------66
[f] COMPRESSOR CAPACITOR - EXCEPT KM-61BAH-------------------------------67
[g] CONTROL BOARD TRANSFORMER--------------------------------------------------67
19. WATER TANK-------------------------------------------------------------------------------------67
20. CUBE GUIDE -------------------------------------------------------------------------------------69
21. SEPARATOR--------------------------------------------------------------------------------------70
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---------------------------------------------------------------74
2. MAINTENANCE ----------------------------------------------------------------------------------75
[a] EXTERIOR PANELS ------------------------------------------------------------------------75
[b] STORAGE BINAND SCOOP-------------------------------------------------------------75
[c] AIR FILTER ------------------------------------------------------------------------------------ 75
[d] CONDENSER---------------------------------------------------------------------------------75
3. PREPARING THE ICEMAKER FOR LONG STORAGE--------------------------------76
iii

1
I. SPECIFICATIONS
1. SPECIFICATIONS
[a] KM-61BAH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 3.4A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPASITY 15A
MAXIMUM FUSE SIZE 15A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *71 (32) 65 (29) 58 (26)
Reference without *marks 80 66 (30) 57 (26) 51 (23)
90 65 (29) *50 (23) 44 (20)
100 64 (29) 49 (22) *38 (17)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 1.7 lbs. (0.75 kg) , 80 pcs.
APPROXIMATE STORAGE CAPACITY 38 lbs. (17 kg)
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 220(10.6) 220(7.4)
WATER gal./24HR (gal./100 lbs.) 10(20.6) 23(32.0)
EXTERIOR DIMENSIONS (WxDxH) 17.75" x 24" x 39" (450 x 610 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 92 lbs. (42 kg), Shipping 117 lbs. (53 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 QA51K13GAU6-E0GS
CONDENSER Air-Cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Capillary Tube
REFRIGERANT CHARGE R134a, 6.4 oz. (180g)
DESIGN PRESSURE High 250PSIG, Low 150PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
ACCESSORIES -REQUIRED N/A
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) 3Y2452
We reserve the right to make changes in specifications and design without prior notice.

2
[b] KM-101BAH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 5.2A ( 5 Min. Freeze AT 104㐈/ WT 80㐈)
MINIMUM CIRCUIT AMPASITY 15A
MAXIMUM FUSE SIZE 15A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *115 (52) 107 (49) 97 (44)
Reference without *marks 80 109 (50) 97 (44) 87 (40)
90 107 (49) *88 (40) 78 (35)
100 106 (48) 86 (39) *69 (31)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 2.31 lbs. (1.05 kg) , 110 pcs.
APPROXIMATE STORAGE CAPACITY 53 lbs. (24 kg)
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 340(9.4) 330(6.8)
WATER gal./24HR (gal./100 lbs.) 20(23.0) 47(40.9)
EXTERIOR DIMENSIONS (WxDxH) 23.75" x 24" x 39" (603 x 610 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 106 lbs. (48 kg), Shipping 136 lbs. (62 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 QA91K22CAU6-E0GS
CONDENSER Air-Cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Capillary Tube
REFRIGERANT CHARGE R134a, 7.8 oz. (220g)
DESIGN PRESSURE High 250PSIG, Low 150PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
ACCESSORIES -REQUIRED N/A
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) 3Y2453
We reserve the right to make changes in specifications and design without prior notice.

3
[c] KM-151BAH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 7.0A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPASITY 15A
MAXIMUM FUSE SIZE 15A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *146 (66) 139 (63) 129 (58)
Reference without *marks 80 140 (64) 129 (59) 119 (54)
90 139 (63) *121 (55) 111 (50)
100 137 (62) 119 (54) *101 (46)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 2.75 lbs. (1.25 kg) , 130 pcs.
APPROXIMATE STORAGE CAPACITY 78 lbs. (36 kg)
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 420(8.4) 390(6.4)
WATER gal./24HR (gal./100 lbs.) 22(17.8) 50(34.5)
EXTERIOR DIMENSIONS (WxDxH) 23.75" x 28" x 39" (603 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 117 lbs. (53 kg), Shipping 150 lbs. (68 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 QA125K29CAU6-E0GS
CONDENSER Air-Cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R134a, 8.5 oz. (240g)
DESIGN PRESSURE High 250PSIG, Low 150PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
ACCESSORIES -REQUIRED N/A
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) 3Y2454
We reserve the right to make changes in specifications and design without prior notice.

4
[d] KM-151BWH
AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 6.8A ( 5 Min. Freeze AT 104°F / WT 80°F )
MINIMUM CIRCUIT AMPASITY 15A
MAXIMUM FUSE SIZE 15A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *146 (66) 141 (64) 136 (62)
Reference without *marks 80 142 (65) 135 (61) 131 (59)
90 141 (64) *130 (59) 125 (57)
100 141 (64) 129 (58) *121 (55)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 2.75 lbs. (1.25 kg) , 130 pcs.
APPROXIMATE STORAGE CAPACITY 78 lbs. (36 kg)
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 395(7.3) 390(6.5)
POT. WATER gal./24HR (gal./100 lbs.) 29(25.0) 52(36.0)
COND. WATER gal./24HR (gal./100 lbs.) 181(140) 103(71)
EXTERIOR DIMENSIONS (WxDxH) 23.75" x 28" x 39" (603 x 712 x 990 mm)
Including 6" legs
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 121 lbs. (55 kg), Shipping 154 lbs. (70 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 QA125K29CAU6-E0GS
CONDENSER Water-Cooled, tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R134a, 10.7 oz. (290g)
DESIGN PRESSURE High 250PSIG, Low 150PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED Ice Scoop, 6" leg 4 pcs
ACCESSORIES -REQUIRED N/A
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) 372097
We reserve the right to make changes in specifications and design without prior notice.

5
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-61BAH, KM-101BAH
Top Panel Separator Spray Tube
Evaporator
Door Water Supply
Tube
Front Panel
Tank
Louver
Control Box
Control Switch
Condenser
Fan Motor
Hot Gas Valve Air Filter Front View
Thermistor
Cleaning
Valve
Water
Valve
Rear Panel Pump
Motor
Power
Supply
Pipe Cover Cord
Drain Valve
Drier Compressor
Rear View
Rear Cover
Float Switch
With Tank Removed Bin Control Switch

6
[b] KM-151BAH
Top Panel Separator Spray Tube
Evaporator
Door Water Supply
Tube
Front Panel
Tank
Louver
Control Box
Control
Switch
Condenser
Compressor
Hot Gas Valve Air Filter Front View Fan Motor
Thermistor
Cleaning
Valve
Water
Valve
Rear Panel Pump Expansion Valve
Motor
Power
Supply
Pipe Cover Cord Drier
Drain Valve
Rear View
Rear Cover
Float Switch
Bin Control Switch
With Tank Removed

7
[c] KM-151BWH
Top Panel Evaporator Spray Tube
Separator
Water Supply
Tube
Door Tank
Front Panel
Louver Control Switch
Control Box
Fan Motor
Air Filter Front View Condenser Compressor
Cleaning Valve
Thermistor
Water Valve
Pump Motor Expansion
Valve
Rear Panel
Drain Valve
Power Hot Gas Valve
Supply
Pipe Cover Cord
Rear Cover Rear View Drier Water Regulating Valve
Float Switch
Bin Control Switch
With Tank Removed

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

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, 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 water pump.
[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.

10
[d] DRAIN CYCLE
LEDs 4, 5, and 6 are on. Comp continues to run, HGV opens, and FMS de-energizes.
PM stops. DV opens for 20 seconds to drain out the water tank. Drain cycle always
occurs on the 2nd harvest after startup. Then, depending on the control board setting,
drain 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.
Legend: 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

12
3. CONTROL BOARD
* A HOSHIZAKI exclusive solid-state control is employed in KM-61BAH, KM-101BAH,
KM-151BAH and KM-151BWH 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 when it goes bad.
6. Do not short out the power supply to test for voltage.

13
[a] CONTROL BOARD LAYOUT
"H" Control Board
Connector K7
Transformer
Connector K3
Magnetic Contactor
Connector K4
Open
POWER OK LED
(Lights when power is
supplied to the board.
Flashes when bin control
is activated.)
Connector K5
Pins
#1 Fan Motor
#2 Hot Gas Valve
#3 Pump Motor
#4 Water Valve
#5 Open
#6 Drain Valve
Connector K6
Open
Connector K1
Pins
#1, 3 Float Switch
#2 Open
#4, 5 Bin Control
#6, 7 Thermistor
#8, 9 Open
Connector K2
Open Alarm Buzzer S1 Dip Switch S2 Dip Switch Alarm Reset Button
(service board only)
Relay LEDs (6)
(indicate which relays
are energized as
listed below)
LED 5 (X1 Relay)
Compressor (Comp)
Remote Fan Motor
(FMR)
LED 6 (X2 Relay)
Hot Gas Valve (HGV)
Self-Contained Fan
Motor (FMS) (FMS off
when LED on)
LED 8 (X4 Relay)
Inlet Water Valve (WV)
(Harvest Water Valve
(HWV) on units with
two inlet water valves)
LED 9 (X5 Relay)
Freeze Water Valve
(FWV) on units with
two inlet water valves
(service board only)
LED 4 (X6 Relay)
Drain Valve (DV)
LED 7 (X3 Relay)
Pump Motor (PM)
Connector K8
Open
Output Test Button
(used to test relays on
board)
Control Board
Auxiliary Code V0 or Earlier V1 or Later
Factory Part Number P00013-03 P01771-01
Service 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 ± 7°F (53°C ± 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, 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 30 to 35 minutes
Drain 5, 6, 4 Comp, HGV,
DV 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.