Hoshizaki KM-630MAH User manual

73114
HOSHIZAKI
MODULAR CRESCENT CUBER
SERVICE MANUAL
KM-630MAH
KM-630MWH
KM-630MRH
MODEL
JUNE23,2004
NO.:
ISSUED:

2
IMPORTANT
Only qualified service technicians should attempt to service or maintain this icemaker.
No service or maintenance should be undertaken until the technician has thoroughly
read this Service Manual.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: HOSHIZAKI Technical Support Department
Phone: [phone] Technical Service
[phone]
Fax: [phone]
NOTE: To expedite assistance, all correspondence/communication MUST include the following
information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.

3
CONTENTS
I. SPECIFICATIONS ............................................................................................................ 5
1. KM-630MAH................................................................................................................ 5
2a. KM-630MWH Serial #L00001D - M20270B................................................................ 6
2b.KM-630MWH Serial #M20301E - ............................................................................... 7
3. KM-630MRH................................................................................................................ 8
4. CONDENSER UNIT .................................................................................................... 9
URC-6F...................................................................................................................... 9
II.GENERAL INFORMATION............................................................................................. 11
1. CONSTRUCTION ...................................................................................................... 11
[a] KM-630MAH........................................................................................................ 11
[b]KM-630MWH....................................................................................................... 12
[c] KM-630MRH........................................................................................................ 13
2. CONTROLLER BOARD............................................................................................. 14
[a] SOLID-STATE CONTROL ................................................................................... 14
[b] CONTROLLER BOARD...................................................................................... 14
[c] SEQUENCE ........................................................................................................ 18
[d] CONTROLS AND ADJUSTMENTS ................................................................... 21
[e] CHECKING THE CONTROLLER BOARD ......................................................... 25
3. MECHANICAL BIN CONTROL.................................................................................. 26
[a] PROXIMITY SWITCH.......................................................................................... 26
[b] EXPLANATION OF OPERATION........................................................................ 26
[c] TROUBLESHOOTING (MECHANICAL BIN CONTROL ONLY).......................... 27
III. TECHNICAL INFORMATION ........................................................................................ 28
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT .................................................... 28
[a] KM-630MAH........................................................................................................ 28
[b]KM-630MWH....................................................................................................... 29
[c] KM-630MRH........................................................................................................ 30
2.WIRING DIAGRAMS .................................................................................................. 31
[a1] KM-630MAH (with auxiliary codes L-0, M-0, and M-1) and KM-630MWH
(with auxiliary codes L-0, M-0, M-1, and M-2).................................................... 31
[a2] KM-630MAH (with auxiliary codes M-2 and after) and KM-630MWH
(with auxiliary codes M-3 and after)................................................................... 32
[b1] KM-630MRH (with auxiliary codes L-0, M-0, M-1) ............................................. 33
[b2] KM-630MRH (with auxiliary codes M-2 and after) ............................................. 34
3.TIMING CHART.......................................................................................................... 35
4. PERFORMANCE DATA ............................................................................................. 37
[a] KM-630MAH........................................................................................................ 37
[b1] KM-630MWH Serial #L00001D - M20270B ...................................................... 38
[b2] KM-630MWH Serial #M20301E - ...................................................................... 39
[c] KM-630MRH........................................................................................................ 40
• Pleasereviewthismanual. It shouldbereadcarefullybefore theicemakerisservicedor
maintenanceoperationsperformed.Onlyqualifiedservicetechniciansshouldserviceand
maintaintheicemaker. Thismanualshouldbemadeavailabletothetechnicianpriorto
serviceormaintenance.

4
IV. SERVICE DIAGNOSIS ................................................................................................. 41
1. NO ICE PRODUCTION.............................................................................................. 41
2. EVAPORATOR IS FROZEN UP................................................................................. 44
3. LOW ICE PRODUCTION ........................................................................................... 45
4. ABNORMAL ICE ........................................................................................................ 45
5. OTHERS .................................................................................................................... 45
V. REMOVAL AND REPLACEMENT OF COMPONENTS................................................ 46
1. SERVICE FOR REFRIGERANT LINES .................................................................... 46
[a] REFRIGERANT RECOVERY ............................................................................. 46
[b] EVACUATION AND RECHARGE [R-404A] ........................................................ 46
2. BRAZING ................................................................................................................... 47
3. REMOVAL AND REPLACEMENT OF COMPRESSOR ............................................ 48
4. REMOVAL AND REPLACEMENT OF DRIER........................................................... 50
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE...................................... 50
6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE AND LINE VALVE............. 51
7. REMOVAL AND REPLACEMENT OF EVAPORATOR.............................................. 53
8. REMOVAL AND REPLACEMENT OF WATER REGULATING VALVE -
WATER-COOLED MODEL ONLY.............................................................................. 54
9. ADJUSTMENT OF WATER REGULATING VALVE - WATER-COOLED
MODEL ONLY ........................................................................................................... 55
10. REMOVAL AND REPLACEMENT OF CONDENSING PRESSURE
REGULATOR (C.P.R.) - REMOTE AIR-COOLED MODEL ONLY ............................ 56
11. REMOVAL AND REPLACEMENT OF THERMISTOR............................................. 57
12. REMOVAL AND REPLACEMENT OF FAN MOTOR ............................................... 58
13. REMOVAL AND REPLACEMENT OF WATER VALVE ............................................ 59
14. REMOVAL AND REPLACEMENT OF PUMP MOTOR ............................................ 59
15. REMOVAL AND REPLACEMENT OF SPRAY TUBES ........................................... 60
VI. CLEANING AND MAINTENANCE INSTRUCTIONS................................................... 61
1. PREPARING THE ICEMAKER FOR LONG STORAGE............................................. 61
2. CLEANING AND SANITIZING PROCEDURES ........................................................ 63
[a] CLEANING PROCEDURE ................................................................................. 64
[b] SANITIZING PROCEDURE................................................................................ 66
3. MAINTENANCE......................................................................................................... 67

5
I. SPECIFICATIONS
1. KM-630MAH
Note: We reserve the right to make changes in specifications and design without prior notice.
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *600 (272) 562 (255) 514 (233)
Reference without *marks 80 571 (259) 512 (232) 466 (211)
90 562 (255) *470 (213) 422 (191)
100 554 (251) 459 (208) 378 (171)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.3 lbs. (6.5 kg) 720 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1332 (6.8) 1250 (5.0)
WATER gal./24HR (gal./100 lbs.) 157 (33.4) 341 (56.9)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-1/2" x 37-1/2" (560 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. ( 70 kg ), Shipping 185 lbs. (84 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Pipe
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 Proximity Switch with Delay
COMPRESSOR Hermetic, Model RS64C1E-CAV
CONDENSER Air-cooled, Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb. 7.6 oz. ( 670 g )
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
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 N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG

6
2a. KM-630MWH Serial #L00001D - M20270B
Note: We reserve the right to make changes in specifications and design without prior notice.
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70
lbs./day ( kg/day ) 70 *619 (281) 596 (270)
Reference without *marks 80 602 (273) 566 (257)
90 596 (270) *541 (245)
100 589 (267) 533 (242)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.3 lbs. (6.5 kg) 720 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1306 (5.7) 1290 (5.0)
WATER gal./24HR (gal./100 lbs.) 196 (36.3) 335 (54.1)
WATER COOLED CONDENSER 844 (156) 458 (74)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-1/2" x 37-1/2" (560 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. ( 70 kg ), Shipping 185 lbs. (84 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Pipe
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 Proximity Switch with Delay
COMPRESSOR Hermetic, Model RS64C1E-CAV
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb. 3 oz. ( 525 g )
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
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 N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
208-230/60/1 (3 wire with neutral for 115V)
6.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
15 A
45 -100° F
45 - 90° F
10 - 113 PSIG
187 - 253 V
533 (242)
507 (230)
476 (216)
Condenser Inlet 1/2" FPT
Condenser Outlet 3/8" FPT
90
563 (256)
15 A

7
2b. KM-630MWH Serial #M20301E -
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 6.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *621 (282) 603 (273) 563 (256)
Reference without *marks 80 607 (275) 578 (262) 532 (241)
90 603 (273) *558 (253) 514 (233)
100 590 (268) 548 (248) 473 (215)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.3 lbs. (6.5 kg) 720 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1279 (5.5) 1268 (4.9)
WATER gal./24HR (gal./100 lbs.) 156 (27.9) 299 (48.1)
WATER COOLED CONDENSER 536 (96) 354 (57)
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-1/2" x 37-1/2" (560 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. ( 70 kg ), Shipping 185 lbs. (84 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT Condenser Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT Condenser Outlet 3/8" FPT
3/8" OD Pipe
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 Pressure Regulator
BIN CONTROL SYSTEM Proximity Switch with Delay
COMPRESSOR Hermetic, Model RS64C2E-CAV-219
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 1 lb. 4.3 oz. ( 575 g )
DESIGN PRESSURE High 427 PSIG, Low 230 PSIG
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 N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
Note: We reserve the right to make changes in specifications and design without prior notice.

8
3. KM-630MRH
Note: We reserve the right to make changes in specifications and design without prior notice.
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 6.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *603 (274) 573 (260) 531 (241)
Reference without *marks 80 580 (263) 532 (242) 491 (223)
90 573 (260) *499 (226) 457 (207)
100 564 (256) 489 (222) 418 (190)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14.3 lbs. (6.5 kg) 720 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1414 (6.8) 1332 (5.3)
WATER gal./24HR (gal./100 lbs.) 166 (33.3) 323 (53.6)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-1/2" x 37-1/2" (560 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 154 lbs. ( 70 kg ), Shipping 185 lbs. (84 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Pipe
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 Proximity Switch with Delay
COMPRESSOR Hermetic, Model RS64C1E-CAV
CONDENSER Air-cooled Remote, Condenser Unit URC 6F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-6F
REFRIGERANT CHARGE R-404A, 4 lb. 4 oz. ( 1950 g )
( Icemaker 2 lbs. 6 oz. Cond. 1 lbs. 14 oz.)
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
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 N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG

9
4. CONDENSER UNIT
URC-6F
24"
(610 mm.)
23-1/32"
(585 mm.)
19-11/16"
(500 mm.)
18-1/8"
(460 mm.)
20-15/32"
(520 mm.)
21-15/16"
(557 mm.)
7/8" DIA. HOLE
(23 mm. DIA.)
6-5/16"
(160 mm.)
2-15/16"
(75 mm.)
18-1/8"
(460 mm.)
6/16" x 3/4" (10 mm. x 20 mm.)
4 x 2 (SLOTTED HOLES)
17-1/8"
(435 mm.)
14-9/16"
(370 mm.)
14-1/8"
(358 mm.)
14-15/16"
(380 mm.)
15-11/16"
(398 mm.)
17-7/8"
(454 mm.)
2-1/2"
(63 mm.)
14-15/16"
(380 mm.)

10
Galvanized Steel
21-15/16" x 15-11/16" x 17-7/8"
(557 x 398 x 453.8 mm.)
R404A 1 lb. 2 oz. (505 g)
Net 61 lbs. (28 kg)
Shipping 68 lbs. (31 kg)
One Shot Couplings (Aeroquip)
PermanentConnection
Air-cooled
Condensing Pressure Regulator
Min. -20°F - Max. +122°F
(-29°C to +50°C)
Outdoor use
SPECIFICATIONS
EXTERIOR
DIMENSIONS (W x D x H)
REFRIGERANT CHARGE
WEIGHT
CONNECTIONS
REFRIGERANT
ELECTRICAL
CONDENSER
HEAD PRESSURE CONTROL
AMBIENT CONDITION
MODEL: URC-6F

11
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-630MAH
Spray Tubes Water Supply Inlet
Control Switch
Condenser
Hot Gas Valve
Expansion Valve Fan Motor
Condenser
Compressor Drier
Float Switch Control Box
Water Pump
Bin Control Thermostat
(exceptmodels with
MechanicalBinControl)
Mechanical
Bin Control
(exceptmodels
withThermostat)

12
[b] KM-630MWH
Spray Tubes Water Supply Inlet
Control Switch Water Regulator
Expansion Valve Hot Gas Valve
Compressor
Float Switch Drier
Water Pump Control Box
Bin Control Thermostat
(exceptmodels with
MechanicalBinControl)
Mechanical
Bin Control
(exceptmodels
withThermostat)

13
[c] KM-630MRH
Spray Tubes Water Supply Inlet
Control Switch Junction Box
Expansion Valve Receiver Tank
Compressor
Float Switch Drier
Water Pump Hot Gas Valve
Line Valve
Control Box
Bin Control Thermostat
(exceptmodels with
MechanicalBinControl)
Mechanical
Bin Control
(exceptmodels
withThermostat)

14
2. CONTROLLER BOARD
[a] SOLID-STATE CONTROL
1) A HOSHIZAKI exclusive solid-state control is employed in Modular Crescent Cubers.
2) A Printed Circuit Board (hereafter called “Controller Board”) includes a stable and high
qualitycontrolsystem.
3) All models are pretested and factory-adjusted.
[b] CONTROLLER BOARD
CAUTION
1.Fragile,handleverycarefully.
2. A controller 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 when 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. Do not misconnect K3, K4 and K5,
because the same connector is used for the Thermistor (white), Float Switch
(black),and Mechanical BinControl (red).
(For machines with thermostat, there is no connection on K4.)
5. Always replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.
PART NUMBER TYPE
2A1410-01 HOS-001A (Control Products)
Features of Control Products “E” Controller Board
1)MaximumWaterSupplyPeriod - 6 minutes
Water Solenoid Valve opening, in the Defrost (Harvest) Cycle, is limited by the defrost
timer. The Water Valve cannot remain open longer than the
maximum period. The Water Valve can close in less than six minutes if the defrost cycle is
completed.

15
2) Defrost Timer
The defrost cycle starts when the Float Switch opens and completes the freeze cycle.
But the Defrost Timer does not start counting until the Thermistor senses 48°F at the
Evaporator outlet. The period from the end of the freeze cycle up to the point of the
Thermistor's sensing varies depending on the ambient and water temperatures.
3) High Temperature Safety - 127 ± 7°F
The temperature of the suction line in the refrigerant circuit is limited by the High
Temperature Safety.
During the defrost cycle the Evaporator temperature rises. The Thermistor senses
48°F and starts the Defrost Timer. After the Defrost Timer counts down to zero,
the normal freeze cycle begins. If the Evaporator temperature continues to rise,
the Thermistor will sense the rise in temperature and at 127 ± 7°F the Thermistor
operates the High Temperature Safety.
This High Temperature Safety shuts down the circuit and the icemaker automatically
stops.
This High Temperature Safety protects the unit from excessive temperature. The Control
Board will Beep every 3 seconds. The white Reset Button on the Control Board must be
pressed with power on to reset the Safety.
4) Low Water Safety
If the Pump Motor is operated without water, the mechanical seal can fail. To prevent this
type of failure, the Controller 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 defrost cycle.
If the Float Switch is in the up position (electrical circuit closed), the Controller Board
changes to the ice making cycle. If the Float Switch is in the down position (electrical
circuit open), the Controller Board changes to a one minute water fill cycle before starting
the ice making cycle. This method allows for a Low Water Safety shut down to protect the
Water Pump from mechanical seal failure.
For water-cooled model, if the water is shut off, the unit is protected by the High Pressure
Switch.
5) High Voltage Cutout
ThemaximumallowablesupplyvoltageofthisicemakerislimitedbytheHighVoltageCutout.
If miswiring (especially on single phase 3 wire models) causes excessive voltage on the
Controller Board, the High Voltage Cutout shuts down the circuit in 3 seconds and the
icemaker automatically stops. When the proper supply voltage is resumed, the icemaker
automaticallystartsrunning again. The Control Board will signal this problem using 7 Beeps
every3seconds.
6) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup a 5 second delay occurs while the board conducts an internal
timer check. A short beep occurs when the power switch is turned ON or OFF.

16
The green LED’s 1-4 represent the corresponding relays and energize and sequence 5
seconds from initial start-up as follows:
Sequence Step LED’s on Length: Min. Max. Avg.
1 Minute Fill Cycle LED4 60 sec.
Harvest Cycle LED1, 4, & 2 2min. 20min. 3-5min.
Freeze Cycle LED1 5min. 60min. 30-35min.
Reverse Pump Out LED1, 3, & 2 10 sec. 20 sec. Factory set.
{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}
The built in safeties shut down the unit and have alarms as follows:
1 beep every 3 sec. = High Evaporator Temperature >127 ° F.
Check for defrost problem (stuck HGV or relay), hot water entering unit, stuck
headmaster, or shorted thermistor.
2 beeps every 3 sec. = Defrost Back Up Timer. Defrost >20 minutes.
Orange LED marked 20 MIN energizes.
Check for open thermistor, HGV not opening, TXV leaking by, low charge, or inefficient
compressor.
3 beeps every 3 sec. = Freeze Back Up Timer. Freeze > 60 minutes.
Yellow LED marked 60 MIN energizes.
Check for F/S stuck closed (up), WV leaking by, HGV leaking by, TXV not feeding
properly, lowcharge, or inefficient compressor.
To manually reset the above safeties, depress white alarm reset button with the power
supplyON.
6 beeps every 3 sec. = Low Voltage. Voltage is 92 Vac or less.
7 beeps every 3 sec. = High Voltage. Control voltage > 147 Vac ±5%.
The red LED will de-energize if voltage protection operates.
The voltage safety automatically resets when voltage is corrected.
The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4,
normal sequence every 5 seconds. S3 should remain in the “OFF” position for normal
operation.
Machines
with
mechanical
bin control
ONLY
4 beeps every 3 sec. = Short Circuit between the K4 connection on
the control board and the bin control relay. Check connections and
replacewire harness if necessary.
5 beeps every 3 sec. = Open Circuit between the K4 connection
on the control board and the bin control relay. Check connections and
replacewire harness if necessary.

17
(Control Products HOS-001A Board)
The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied
to the K1 connector. If there is a white wire, place the switch in the C position. If this
switch is placed in the wrong position, either the compressor contactor will remain ener-
gized with the control switch OFF, or the unit will not start.
The dip switches should be adjusted per the adjustment chart published in the Tech
Specs book. Number 8 must remain in the OFF position.

18
[c] SEQUENCE
1st Cycle
1. Unit energized and Control Switch to “ICE”
position. Water supply cycle starts.
2. After 1 minute,
Defrost cycle starts.
3. Thermistor reads 48° F.
Defrost Timer starts counting.
IMPORTANT
Water Valve
opening is limited
to 6 minutes.
&
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
4. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.

19
2nd Cycle and after with pump drain
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if Float Switch does not open.
1. Float Switch opens and signals to complete
freeze cycle.
Drain timer starts counting.
2. Drain timer stops counting.
Pump drain is completed
3. Thermistor reads 48° F.
Defrost Timer starts
counting.
IMPORTANT
Water Valve
opening is limited to 6
minutes.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
4. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.
&

20
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if Float Switch does not open.
2nd Cycle and after with no pump drain
1. Float Switch opens and signals to complete
freeze cycle. 2. Thermistor reads 48° F.
Defrost Timer starts counting.
IMPORTANT
Water Valve
opening is limited to 6
minutes.
4. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when Float
Switch circuit opens.
3. Defrost Timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. Defrost cycle time is limited to 20 minutes
even if Defrost Timer does not stop counting.
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