Hoshizaki Ice Maker KM 2500SRH3 User Manual

Hoshizaki America, Inc.  
Hoshizaki  
Stackable Crescent Cuber  
Models  
KM-2500SWH3  
KM-2500SRH3  
SERVICE MANUAL  
“A Superior Degree  
of Reliability”  
Number: 73164  
Issued: 6-10-2010  
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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  
Important Safety Information ................................................................................................. 5  
I. Specifications...................................................................................................................... 6  
A. Icemaker ....................................................................................................................... 6  
1. KM-2500SWH3 (water-cooled) ................................................................................ 6  
2. KM-2500SRH3 (remote air-cooled) ......................................................................... 7  
B. Condenser Unit ............................................................................................................. 8  
1. URC-23F.................................................................................................................. 8  
II. General Information......................................................................................................... 10  
A. Construction................................................................................................................ 10  
1. KM-2500SWH3 (water-cooled) .............................................................................. 10  
2. KM-2500SRH3 (remote air-cooled) ........................................................................11  
B. Sequence of Operation ............................................................................................... 12  
1. Sequence Cycles and Shutdown ........................................................................... 12  
a) 1-Minute Fill Cycle ........................................................................................... 12  
b) Initial Harvest Cycle ........................................................................................ 12  
c) Freeze Cycle ................................................................................................... 12  
d) Pump-Out Cycle .............................................................................................. 12  
e) Harvest Cycle .................................................................................................. 13  
f) Shutdown.......................................................................................................... 13  
2. Sequence Flow Chart............................................................................................ 14  
C. Control Board.............................................................................................................. 15  
1. Control Board Layout ............................................................................................. 16  
2. Features................................................................................................................. 17  
a) Maximum Water Supply Period – 6 minutes .................................................... 17  
b) Harvest Backup Timer and Freeze Timer......................................................... 17  
c) High Temperature Safety.................................................................................. 17  
d) Low Water Safety............................................................................................. 17  
e) High Voltage and Low Voltage Cut-outs........................................................... 17  
3. LED Lights and Audible Alarm Safeties ................................................................. 18  
4. Controls and Adjustments...................................................................................... 19  
a) Default Dip Switch Settings.............................................................................. 19  
b) Harvest Timer (S4 dip switch 1 & 2)................................................................. 19  
c) Pump-Out Timer (S4 dip switch 3 & 4)............................................................. 20  
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 20  
e) Bin Control Selector (S4 dip switch 7).............................................................. 21  
f) Factory Use (S4 dip switch 8)........................................................................... 21  
g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 21  
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D. Bin Control .................................................................................................................. 22  
E. Float Switch................................................................................................................. 22  
F. Thermistor.................................................................................................................... 22  
G. Control Switch............................................................................................................. 22  
III. Technical Information...................................................................................................... 23  
A. Water Circuit and Refrigeration Circuit........................................................................ 23  
1. KM-2500SWH3 (water-cooled) .............................................................................. 23  
2. KM-2500SRH3 (remote air-cooled) ....................................................................... 24  
B. Wiring Diagrams.......................................................................................................... 25  
1. KM-2500SWH3 (water-cooled), KM-2500SRH3 (remote air-cooled) ..................... 25  
C. Performance Data ....................................................................................................... 26  
1. KM-2500SWH3 (water-cooled) .............................................................................. 26  
2. KM-2500SRH3 (remote air-cooled) ....................................................................... 27  
IV. Service Diagnosis........................................................................................................... 28  
A. Diagnostic Procedure ................................................................................................. 28  
B. Control Board Check................................................................................................... 31  
C. Bin Control Check ....................................................................................................... 32  
D. Float Switch Check and Cleaning ............................................................................... 32  
E. Thermistor Check........................................................................................................ 34  
F. Diagnostic Charts ........................................................................................................ 35  
V. Removal and Replacement of Components .................................................................... 43  
A. Service for Refrigerant Lines....................................................................................... 43  
1. Refrigerant Recovery ............................................................................................. 43  
2. Brazing .................................................................................................................. 44  
3. Evacuation and Recharge (R-404A)...................................................................... 44  
B. Removal and Replacement of Compressor................................................................. 45  
C. Removal and Replacement of Expansion Valve.......................................................... 46  
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve ............................. 47  
E. Removal and Replacement of Evaporator................................................................... 48  
F. Removal and Replacement of Water-Cooled Condenser............................................. 49  
G. Removal and Replacement of Remote Air-Cooled Condenser................................... 50  
H. Removal and Replacement of Water Regulating Valve (water-cooled model)............. 51  
I. Adjustment of Water Regulating Valve - Water-Cooled Model ...................................... 52  
J. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.) -  
Remote Air-Cooled Model......................................................................................... 52  
K. Removal and Replacement of Thermistor................................................................... 53  
L. Removal and Replacement of Fan Motor – Remote Air-Cooled Model........................ 54  
M. Removal and Replacement of Inlet Water Valve......................................................... 54  
N. Removal and Replacement of Pump Motor ................................................................ 55  
O. Removal and Replacement of Control Board.............................................................. 56  
VI. Cleaning and Maintenance............................................................................................. 57  
A. Cleaning and Sanitizing Instructions........................................................................... 57  
1. Cleaning Procedure................................................................................................ 58  
2. Sanitizing Procedure - Following Cleaning Procedure........................................... 59  
B. Maintenance................................................................................................................ 60  
C. Preparing the Icemaker for Long Storage ................................................................... 60  
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Important Safety Information  
Throughout this manual, notices appear to bring your attention to situations which could  
result in death, serious injury, or damage to the unit.  
WARNING  
Indicates a hazardous situation which could result in death or  
serious injury.  
CAUTION  
IMPORTANT  
Indicates a situation which could result in damage to the unit.  
Indicates important information about the use and care of the  
unit.  
WARNING  
This icemaker should be destined only to the use for which it has been  
expressly conceived. Any other use should be considered improper and  
therefore dangerous. The manufacturer cannot be held responsible for eventual  
damage caused by improper, incorrect, and unreasonable use.  
To reduce the risk of death, electric shock, serious injury, or fire, follow  
basic precautions including the following:  
• Electrical connection must be hard-wired and must meet national, state, and  
local electrical code requirements. Failure to meet these code requirements  
could result in death, electric shock, serious injury, re, or severe damage to  
equipment.  
• This unit requires an independent power supply. See the nameplate for proper  
voltage and breaker/fuse size. Failure to use a proper breaker or fuse can  
result in a tripped breaker, blown fuse, or damage to existing wiring. This  
could lead to heat generation or fire.  
THIS UNIT MUST BE GROUNDED. Failure to properly ground this unit could  
result in death or serious injury.  
• This unit should be disassembled or repaired only by qualified service  
personnel to reduce the risk of electric shock, injury, or fire.  
• Do not make any alterations to the unit. Alterations could result in electric  
shock, injury, re, or damage to the unit.  
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I. Specifications  
A. Icemaker  
1. KM-2500SWH3 (water-cooled)  
AC SUPPLY VOLTAGE  
AMPERAGE  
208-230/60/3  
14.2 A ( 5 Min. Freeze AT 104°F / WT 80°F)  
MINIMUM CIRCUIT AMPACITY  
MAXIMUM FUSE SIZE  
APPROXIMATE ICE PRODUCTION  
PER 24 HR.  
30 A  
30 A  
Ambient  
Temp.(°F)  
70  
WATER TEMP. (°F)  
50  
70  
90  
lbs./day ( kg/day )  
Reference without *marks  
*2408 (1092)  
2398 (1088)  
2395 (1087)  
2327 (1055)  
2395 (1087)  
2379 (1079)  
*2365 (1073)  
2323 (1054)  
2256 (1024)  
2172 (985)  
2184 (991)  
2018 (915)  
80  
90  
100  
SHAPE OF ICE  
Crescent Cube  
ICE PRODUCTION PER CYCLE  
APPROXIMATE STORAGE CAPACITY  
ELECTRIC & WATER CONSUMPTION  
ELECTRIC W (kWH/100 lbs.)  
WATER gal./24HR (gal./100 lbs.)  
WATER COOLED CONDENSER  
gal./24HR (gal./100 lbs.)  
CEC/CEE TIER LEVEL  
46.3 lbs. (21 kg) 2160pcs.  
N/A  
90/70°F  
3720(3.78)  
459(19.4)  
70/50°F  
3510(3.5)  
744(30.9)  
1430(59)  
1430(101)  
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ENERGY STAR  
N/A  
EXTERIOR DIMENSIONS (WxDxH)  
EXTERIOR FINISH  
WEIGHT  
CONNECTIONS - ELECTRIC  
- WATER SUPPLY  
48" x 27-3/8" x 36-7/16" (1219 x 695 x 925 mm)  
Stainless Steel, Galvanized Steel (Rear)  
Net 390 lbs. (177 kg), Shipping 415 lbs. (188 kg)  
Permanent - Connection  
Inlet  
1/2" FPT  
Condenser Inlet 1/2" FPT  
Condenser Outlet 1/2" FPT  
- DRAIN  
Outlet  
3/4" FPT  
3/8" OD Tube  
CUBE CONTROL SYSTEM  
HARVESTING CONTROL SYSTEM  
ICE MAKING WATER CONTROL  
COOLING WATER CONTROL  
BIN CONTROL SYSTEM  
COMPRESSOR  
Float Switch  
Hot Gas and Water, Thermistor and Timer  
Timer Controlled. Overflow Pipe  
N/A  
Thermostat  
Hermetic, Model CS27K6E-TF5-237  
Water Cooled, Tube in Tube Type  
Vertical type, Stainless Steel and Copper  
Thermostatic Expansion Valve  
R404A, 4 lb. 11.5 oz. (2140g)  
High 427PSIG, Low 230PSIG  
High Voltage Cut-out ( Internal )  
Auto-reset Overload Protector ( Internal )  
Auto-reset High Pressure Control Switch  
Float Switch  
CONDENSER  
EVAPORATOR  
REFRIGERANT CONTROL  
REFRIGERANT CHARGE  
DESIGN PRESSURE  
P.C. BOARD CIRCUIT PROTECTION  
COMPRESSOR PROTECTION  
REFRIGERANT CIRCUIT PROTECTION  
LOW WATER PROTECTION  
ACCESSORIES -SUPPLIED  
-REQUIRED  
N/A  
Ice Storage Bin  
OPERATING CONDITIONS  
VOLTAGE RANGE  
AMBIENT TEMP.  
187 - 253 V  
45 -100° F  
WATER SUPPLY TEMP.  
WATER SUPPLY PRESSURE  
45 - 90° F  
10 - 113 PSIG  
Note: We reserve the right to make changes in specifications and design without prior  
notice.  
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2. KM-2500SRH3 (remote air-cooled)  
AC SUPPLY VOLTAGE  
AMPERAGE  
208-230/60/3  
17.7 A ( 5 Min. Freeze AT 104°F / WT 80°F)  
MINIMUM CIRCUIT AMPACITY  
MAXIMUM FUSE SIZE  
APPROXIMATE ICE PRODUCTION  
PER 24 HR.  
30 A  
30 A  
Ambient  
Temp.(°F)  
70  
WATER TEMP. (°F)  
70  
*2424 (1100) 2373 (1076)  
2385 (1082) 2306 (1046)  
2373 (1076) *2250 (1021)  
50  
90  
lbs./day ( kg/day )  
Reference without *marks  
2196 (996)  
2069 (939)  
2035 (923)  
1837 (833)  
80  
90  
100  
2301 (1044)  
2200 (998)  
SHAPE OF ICE  
Crescent Cube  
ICE PRODUCTION PER CYCLE  
APPROXIMATE STORAGE CAPACITY  
ELECTRIC & WATER CONSUMPTION  
ELECTRIC W (kWH/100 lbs.)  
WATER gal./24HR (gal./100 lbs.)  
CEC/CEE TIER LEVEL  
ENERGY STAR  
46.1 lbs. (20.9 kg) 2160pcs.  
N/A  
90/70°F  
4220(4.5)  
419(18.6)  
2
70/50°F  
3780(3.7)  
791(32.6)  
YES  
EXTERIOR DIMENSIONS (WxDxH)  
EXTERIOR FINISH  
WEIGHT  
CONNECTIONS - ELECTRIC  
- WATER SUPPLY  
48" x 27-3/8" x 36-7/16" (1219 x 695 x 925 mm)  
Stainless Steel, Galvanized Steel (Rear)  
Net 390 lbs. (177 kg), Shipping 440 lbs. (200 kg)  
Permanent - Connection  
Inlet  
1/2" FPT  
- DRAIN  
Outlet  
3/4" FPT  
3/8" OD Tube  
CUBE CONTROL SYSTEM  
HARVESTING CONTROL SYSTEM  
ICE MAKING WATER CONTROL  
COOLING WATER CONTROL  
BIN CONTROL SYSTEM  
COMPRESSOR  
CONDENSER  
EVAPORATOR  
REFRIGERANT CONTROL  
Float Switch  
Hot Gas and Water, Thermistor and Timer  
Timer Controlled. Overflow Pipe  
N/A  
Thermostat  
Hermetic, Model MTZ-57-HL3A  
Air-Cooled Remote, Condenser Unit URC-23F  
Vertical type, Stainless Steel and Copper  
Thermostatic Expansion Valve  
Condensing Pressure Regulator on Icemaker (190 PSI)  
R404A, 24 lb. 7.5 oz. (11100g)  
(Icemaker 14 lbs. 12.3 oz. Cond. Unit 9 lbs. 11.2 oz.)  
High 467PSIG, Low 230PSIG  
REFRIGERANT CHARGE  
DESIGN PRESSURE  
P.C. BOARD CIRCUIT PROTECTION  
COMPRESSOR PROTECTION  
REFRIGERANT CIRCUIT PROTECTION  
LOW WATER PROTECTION  
ACCESSORIES -SUPPLIED  
-REQUIRED  
High Voltage Cut-out ( Internal )  
Auto-reset Overload Protector ( Internal )  
Auto-reset High Pressure Control Switch  
Float Switch  
N/A  
Ice Storage Bin, Remote Condenser Unit  
OPERATING CONDITIONS  
VOLTAGE RANGE  
187 - 253 V  
AMBIENT TEMP.  
WATER SUPPLY TEMP.  
WATER SUPPLY PRESSURE  
45 -100° F  
45 - 90° F  
10 - 113 PSIG  
Note: We reserve the right to make changes in specifications and design without prior  
notice.  
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B. Condenser Unit  
1. URC-23F  
Note: We reserve the right to make changes in specifications and design without prior  
notice.  
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SPECIFICATIONS  
MODEL: URC-23F  
AC SUPPLY VOLTAGE  
FAN MOTOR  
115/60/1 (Connection to Icemaker)  
115 V Total 2.6FLA 130W  
EXTERIOR DIMENSIONS (WxDxH)  
DIMENSIONS INCLUDING LEGS (WxDxH)  
EXTERIOR FINISH  
46-3/8" x 15-11/16" x 25-15/16" (1178 x 398 x 659 mm)  
48-7/16" x 18-1/8" x 40-7/8" (1230 x 460 x 1039 mm)  
Galvanized Steel  
WEIGHT  
Net 158 lbs. ( 72 kg )  
Shipping 169 lbs. ( 77 kg )  
CONNECTIONS - ELECTRIC  
- REFRIGERANT  
Permanent - Connection  
Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)  
Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)  
CONDENSER  
Air-cooled, Fin and tube type  
FAN MOTOR PROTECTION  
REFRIGERANT CONTROL  
REFRIGERANT CHARGE  
DESIGN PRESSURE  
Thermal Protection  
Condensing Pressure Regulator (In Ice Machine)  
R-404A  
9 lb. 11oz.  
(4400g)  
High 467 PSIG  
VOLTAGE RANGE  
AMBIENT TEMP.  
Leg  
32.2 Bar  
OPERATING CONDITIONS  
104 ~ 127 V  
-20 ~ 122 °F  
ACCESSORIES -SUPPLIED  
2 pcs  
8 pcs  
8 pcs  
Hex. Head Bolt w/Washer 8 x 16  
Hex. Nut  
8
Note: We reserve the right to make changes in specifications and design without prior  
notice.  
9
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II. General Information  
A. Construction  
1. KM-2500SWH3 (water-cooled)  
Spray Tubes  
Inlet Water Valve  
Expansion Valves  
Water Supply Inlet  
Evaporator Assembly  
Check Valves  
(Refrigeration Circuit)  
Junction Box  
Hot Gas Valve  
Strainer  
Water  
Regulating  
Valve  
Check Valve  
(water)  
Control Box  
Service Valves  
Condenser  
Drier  
Water Pump  
Float Switch  
Liquid Line Valve  
Cleaning Valve  
Compressor  
Main Transformer  
Box  
Bin Control Thermostat  
Control Switch  
Bin Control Bulb Holder  
Bin Control "Z" Bracket  
Bin Control Thermostat Bracket  
Bin Control Extension Bracket  
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2. KM-2500SRH3 (remote air-cooled)  
Spray Tubes  
Inlet Water Valve  
Expansion Valves  
Water Supply Inlet  
Evaporator Assembly  
Check Valves  
(Refrigeration Circuit)  
Junction Boxes  
Hot Gas Valve  
Strainer  
Headmaster  
(C.P.R.)  
Shut-Off Valve  
(Factory Use Only)  
Check Valve  
(water)  
Control Box  
Service Valves  
Receiver Tank  
Drier  
Water Pump  
Float Switch  
Liquid Line Valve  
Cleaning Valve  
Compressor  
Main Transformer  
Box  
Bin Control Thermostat  
Control Switch  
Bin Control Bulb Holder  
Bin Control "Z" Bracket  
Bin Control Thermostat Bracket  
Bin Control Extension Bracket  
11  
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B. Sequence of Operation  
1. Sequence Cycles and Shutdown  
The steps in the sequence are as outlined below. When power is supplied and BC is  
closed, CB red "POWER OK" LED comes on. There is a 5-second delay before startup.  
Note that the order of the LEDs from the outer edge of CB is 1, 4, 3, 2.  
a) 1-Minute Fill Cycle  
LED 4 is on. WV energizes and the 1-minute fill cycle begins. After 1 minute, CB checks  
for a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized  
through additional 1-minute fill cycles until water enters the tank and closes F/S. This  
serves as a low water safety to protect PM.  
b) Initial Harvest Cycle  
LEDs 1, 4, and 2 are on. WV remains energized, Comp, FMR, and HGV energize.  
CB monitors the warming of the evaporator via the thermistor located on the suction line.  
When the thermistor warms to 48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor  
and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2) which is  
factory set for normal conditions. The harvest timer has settings of 60, 90, 120, and 180  
seconds. For details, see "II.C.4.b) Harvest Timer (S4 Dip Switch 1 & 2)." When the  
harvest timer terminates, the harvest cycle is complete. At the end of harvest, CB checks  
the position of F/S and proceeds to the next cycle if it is closed or calls for a 1-minute fill  
cycle if it is open. The minimum total time allowed by CB for a complete harvest cycle is  
2 minutes. WV is energized during harvest for a maximum of 6 minutes or the length of  
harvest, whichever is shorter.  
c) Freeze Cycle  
LED 1 is on. Comp and FMR remain energized. PM and LLV energize. HGV and WV  
de-energize. For the first 5 minutes, CB will not accept a signal from F/S. This 5-minute  
minimum freeze time is short cycle protection for Comp. At the end of 5 minutes, F/S  
assumes control of freeze termination. As ice builds on the evaporator, the water level  
in the tank lowers. The freeze cycle continues until F/S opens, then CB terminates the  
freeze cycle.  
d) Pump-Out Cycle  
LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and 4 on.  
Comp and FMR remain energized. HGV energizes, LLV de-energizes. WV energizes  
if S4 dip switch 3 & 4 are set to 3 off and 4 on. PM stops for 2 seconds then reverses,  
taking water from the bottom of the tank and forcing pressure against the check valve  
seat allowing water to go through the check valve and down the drain. At the same time,  
water flows through the small F/S tube to power flush F/S. When the pump-out timer (S4  
dip switch 3 & 4) terminates, pump-out is complete.  
The first pump-out occurs after the first freeze cycle and every cycle thereafter. The  
pump-out frequency control is factory set to drain the water tank every cycle, and  
generally no adjustment is required. The pump-out frequency control (S4 dip switch 5  
& 6) can be set to have a pump out occur every cycle, or every 2, 5, or 10 cycles. For  
details, see "II.C.4.d) Pump-Out Frequency Control (S4 Dip Switch 5 & 6)."  
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e) Harvest Cycle  
Same as the initial harvest cycle. See "II.B.1.b) Initial Harvest Cycle."  
Note: Unit continues to cycle until BC is satisfied or power is turned off. The unit always  
restarts at the 1-minute fill cycle.  
f) Shutdown  
When ice contacts the thermostatic bulb (BC switch open), BC shuts down the unit within  
10 seconds. BC is factory set, and generally no adjustment is required. However,  
adjustment may be needed in some conditions, particularly at higher altitude  
locations. CAUTION! Do not adjust S4 dip switch 7 out of the factory default  
position on this model.This dip switch must be left in the factory default position  
or this unit will not operate correctly.  
Legend: BC–bin control; CB–control board; Comp–compressor; FMR–fan  
motor-remote; F/S–float switch; HGV–hot gas valve; LLV–liquid line valve;  
PM–pump motor; WV–inlet water valve  
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2. Sequence Flow Chart  
14  
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C. Control Board  
• A Hoshizaki exclusive control board is employed in KM-2500SWH3 and KM-2500SRH3  
Stackable Crescent Cubers.  
• All models are pretested and factory-adjusted.  
• For a control board check procedure, see "IV.B. Control Board Check."  
CAUTION  
1. The control board is fragile; handle very carefully.  
2. The 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 control board.  
3. Do not touch the electronic devices on the control board or the back of the  
control board.  
4. Do not change wiring and connections. Do not misconnect K3, K4, and K5,  
because the same connector is used for the thermistor and float switch. K4 is  
not connected.  
5. Always replace the whole control board assembly if it goes bad.  
6. Do not short out power supply to test for voltage.  
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1. Control Board Layout  
"E" Control Board  
• "ALARM RESET" Button  
• S4 Dip Switch  
• "OUTPUT TEST" Button  
(used to test relays on control board)  
"F TIMER"  
Freeze Timer LED  
• WHITE K3 Connector  
Harvest Control  
(thermistor)  
• "H TIMER"  
Harvest Backup  
Timer LED  
• RED K4 Connector  
Open (not connected)  
• Alarm Buzzer  
• "Power OK" LED  
(red) (lights when  
power is supplied to  
the control board)  
• Microprocessor  
(control board  
revision level  
indicated by last 2  
digits on label)  
• Relay LEDs (4)  
(indicate which relays  
are energized as  
listed below)  
• BLACK K5 Connector  
Float Switch  
• Part Number  
• LED 2 (X2 Relay)  
Hot Gas Valve (HGV)  
Fan Motor (FM) (FM  
off when LED on)  
• K1 Ten-Pin Connector  
Pins #1 through #10  
#1, 9 Magnetic Contactor (CR)  
Fan Motor-Remote (FMR)  
#2 Hot Gas Valve (HGV)  
#3 Fan Motor (FM)  
• LED 3 (X3 Relay)  
Pump Motor (PM)  
(on at pump-out only)  
Liquid Line Valve (LLV)  
#4 Pump Motor (icemaking)  
#5 Pump Motor (pump-out)  
#6 Inlet Water Valve (WV)  
#7, 10 Component Power  
Supply  
• LED 4 (X4 Relay)  
Inlet Water Valve (WV)  
• LED 1 (X1 Relay)  
Compressor  
(Comp)  
Fan Motor-Remote  
(FMR)  
#8 Open  
• Switch for "C" Control Board  
and "ALPINE" Control Board  
(service boards only)  
• K2 Connector  
Transformer  
"E" Control Board  
Part Number  
2A1410-01 (factory); 2A1410-02 (service)  
16  
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2. Features  
a) Maximum Water Supply Period – 6 minutes  
The inlet water valve remains energized during harvest for 6 minutes or the length of  
harvest 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 signals with the  
"H Timer" LED and 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 by the freeze timer (S4 dip switch 9 & 10). The  
control board signals with the "F Timer" LED and 3 beeps every 3 seconds. The freeze  
timer is factory set and no adjustment is required.  
To reset either of these safeties, press the "ALARM RESET" button on the control board  
with power on.  
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 reaches 127 7°F (53 4°C), the control board reads a .8 kΩ  
signal from the thermistor and shuts down the icemaker.  
The control board signals with 1 beep every 3 seconds. To reset this safety, press the  
"ALARM RESET" button on the control board with power on.  
d) Low Water Safety  
The control board checks the position of the float switch at the end of the initial 1-minute  
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 proceeds to the next cycle. If the float switch  
is in the down position (electrical circuit open), the control board returns to the 1-minute  
fill cycle until water enters the tank and the float switch closes. Once the float switch  
closes, the control board proceeds to the next cycle. The unit should not start without  
adequate water in the tank. This serves as a low water safety to protect the pump motor  
from mechanical seal failure.  
For water-cooled model, if the water 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 unit are limited by the high  
voltage and low voltage cut-outs.  
Miswiring (especially on single phase 3 wire models) may cause excessive voltage  
(147VAC 5% or more).  
If high voltage (147VAC 5% or more) is present, the icemaker automatically stops and  
the control board signals with 7 beeps every 3 seconds.  
If low voltage (92VAC 5% or less) is present, the icmaker automatically stops and the  
control board signals with 6 beeps every 3 seconds.  
When the proper supply voltage is resumed, the icemaker automatically starts running  
again.  
17  
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3. LED Lights and Audible Alarm Safeties  
At startup, a 5-second delay occurs while the control board conducts an internal timer  
check. A beep occurs when power is turned off. The red LED indicates proper control  
voltage and remains on unless a control voltage problem occurs. The green LEDs 1  
through 4 energize and sequence from startup as listed in the table below. Note that  
the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2. For more  
information, see "II.B. Sequence of Operation."  
Time LEDs are On  
Sequence Step  
LED  
Energized  
Min.  
Max.  
Avg.  
1 minute  
1-Minute Fill Cycle 4  
WV  
Harvest Cycle  
1, 4, 2  
Comp, FMR, 2 minutes 20 minutes 3 to 5 minutes  
WV, HGV  
Freeze Cycle  
1
Comp, FMR, 5 minutes freeze timer 30 to 35 minutes  
PM, LLV  
setting  
Pump-Out Cycle  
1, 4*, 3, 2  
Comp, FMR, 10 seconds 20 seconds *pump-out timer  
WV*, PM,  
HGV  
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
3
Harvest Backup Timer  
(harvest > 20 min. for  
two cycles in a row)  
Orange "H TIMER" LED on.  
Check for open thermistor, HGV not opening,  
TXV or LLV leaking by, WRV leaking by, low  
charge, or inefficient Comp.  
Freeze Timer  
Yellow "F TIMER" LED on.  
(freeze > freeze timer  
Check for F/S stuck closed (up), WV leaking  
setting for two cycles in a by, HGV leaking by, PM not pumping, TXV not  
row) feeding properly, LLV not opening, low charge,  
Timer is factory set using HM not bypassing, or inefficient Comp.  
S4 dip switch 9 & 10  
To reset the above safeties, press the "ALARM RESET" button with the power supply on.  
6
Low Voltage  
(92VAC 5% or less)  
Red LED turns off if voltage protection  
operates.  
The control voltage safeties automatically reset  
when voltage is corrected.  
7
High Voltage  
(147VAC 5% or more)  
Legend: Comp–compressor; FMR–fan motor-remote; F/S–float switch; HGV–hot gas  
valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump motor;  
TXV–thermostatic expansion valve; WRV–water regulating valve; WV–inlet  
water valve  
18  
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4. Controls and Adjustments  
CAUTION  
Dip switches are factory set. Failure to maintain factory settings may adversely  
affect performance and warranty coverage. For more information, contact  
Hoshizaki Technical Support at 1-800-233-1940.  
a) Default Dip Switch Settings  
The dip switches are factory-adjusted to the following positions:  
S4 Dip Switch  
S4 Dip Switch No.  
KM-2500SWH3  
KM-2500SRH3  
1
2
3
4
5
6
7
8
9
10  
OFF OFF OFF OFF OFF OFF OFF OFF OFF ON  
OFF OFF OFF OFF OFF OFF OFF OFF OFF ON  
Freeze Timer (9 & 10)  
Factory Use (8)  
Bin Control Selector (7)  
Pump-Out Frequency Control (5 & 6)  
Pump-Out Timer (3 & 4)  
Harvest Timer (1 & 2)  
b) Harvest Timer (S4 dip switch 1 & 2)  
The harvest timer starts when the thermistor warms to 48°F (9°C) at the evaporator  
outlet and the control board reads the thermistor's 3.9 kΩ signal. The harvest timer is  
factory set, and generally no adjustment is required. However, a setting longer than the  
factory setting may be advised in cases where the flush provided at harvest needs to be  
prolonged for extra cleaning. Before changing this setting, contact Hoshizaki Technical  
Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest  
timer to a longer setting will decrease 24 hour production.  
Note that the pump-out timer (S1 dip switch 3 & 4) acts in place of the harvest timer  
during cycles with a pump-out. For details, see "II.C.4.c) Pump-Out Timer (S1 dip  
switch 3 & 4)."  
S4 Dip Switch Setting  
Time  
(seconds)  
No. 1  
OFF  
ON  
No. 2  
OFF  
OFF  
ON  
60  
90  
OFF  
ON  
120  
180  
ON  
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c) Pump-Out Timer (S4 dip switch 3 & 4)  
When a pump-out is called for, the pump motor stops after the preceding freeze cycle.  
The pump motor energizes 2 seconds later in the reverse direction, taking water from  
the bottom of the tank and forcing pressure against the check valve seat allowing water  
to go through the check valve and down the drain. At the same time, water flows through  
the small float switch tube to power flush the float switch. The pump motor drains the  
water tank for the time determined by the pump-out timer. The pump-out timer also acts  
in place of the harvest timer during cycles with a pump-out. The pump-out timer is factory  
set, and generally no adjustment is required. However, where water quality is bad and  
the icemaker needs a longer pump-out time, the pump-out timer can be adjusted. The  
pump-out timer control can be set to pump-out for 10 or 20 seconds.  
S4 Dip Switch Setting  
Time (seconds)  
Inlet  
Water  
Valve  
No. 3  
OFF  
ON  
No. 4  
OFF  
OFF  
ON  
T1  
10  
10  
10  
20  
T2  
150  
180  
120  
180  
closed  
closed  
open  
OFF  
ON  
ON  
closed  
T1: Time to drain the water tank  
T2: Harvest timer at pump-out  
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)  
The pump-out frequency control is factory set to drain the water tank every cycle, and  
generally no adjustment is required. The pump-out frequency control can be set to have  
a pump-out occur every cycle, or every 2, 5, or 10 cycles.  
The first pump-out occurs after the 1st freeze cycle.  
S4 Dip Switch Setting  
Frequency  
No. 5  
OFF  
ON  
No. 6  
OFF  
OFF  
ON  
every cycle  
every 2 cycles  
every 5 cycles  
every 10 cycles  
OFF  
ON  
ON  
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e) Bin Control Selector (S4 dip switch 7)  
S4 dip switch 7 is the bin control selector.  
CAUTION  
Do not adjust. This dip switch must be left in the factory default position or this  
unit will not operate correctly.  
Factory set for proper operation. Do not adjust. When set to the on position on a unit with  
a thermostatic bin control, a 5-beep alarm sounds (open circuit) and the unit does not  
operate.  
S4 Dip Switch Setting  
Bin Control  
No. 7  
ON  
Mechanical  
OFF  
Thermostatic  
f) Factory Use (S4 dip switch 8)  
Factory set for proper operation. Do not adjust. This must be left in the factory default  
position.  
g) Freeze Timer (S4 dip switch 9 & 10)  
CAUTION  
Adjust to proper specification, or the unit may not operate correctly.  
The freeze timer setting determines the maximum allowed freeze time to prevent possible  
freeze-up issues. Upon termination of the freeze timer, the control board initiates the  
harvest cycle. After 2 consecutive timer terminations, the control board shuts down the  
icemaker. In this case, see "IV.F.3. Low Ice Production" for possible solutions. The freeze  
timer is factory set, and generally no adjustment is required. Before changing this setting,  
contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations.  
S4 Dip Switch Setting  
Time  
(minutes)  
No. 9  
OFF  
OFF  
ON  
No. 10  
OFF  
ON  
60  
50  
70  
60  
OFF  
ON  
ON  
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D. Bin Control  
CAUTION  
When the ambient temperature is below 45°F (7°C), the thermostatic bin  
control switch opens and shuts down the icemaker even if the ice storage bin  
is empty. When the thermostat is set in the prohibited range, the icemaker  
operates continuously even if the ice storage bin is filled with ice. Setting in the  
prohibited range may result in severe damage to the icemaker.  
The thermostatic bin control switch is a temperature controlled switch used to control  
the level of ice in the bin. It is in line with the power supply to the control switch.  
The thermostatic bin control switch shuts down the unit within 10 seconds when ice  
contacts the thermostatic bulb, regardless of the cycle at activation. The bin control  
is factory set, and generally no adjustment is required. However, adjustment may be  
needed in some conditions, particularly at higher altitude locations. For further details,  
see "IV.C. Bin Control Check."  
E. Float Switch  
The float switch is used to determine that there is sufficient water in the tank after the  
1-minute fill cycle and after each harvest cycle. The float switch is also used to determine  
that the appropriate volume of water has been converted into ice before switching out of  
the freeze cycle. No adjustment is required.  
F.Thermistor  
The thermistor is used as a harvest control sensor. The thermistor's resistance varies  
depending on the suction line temperature. The control board monitors the resistance to  
start the harvest timer. No adjustment is required.  
G. Control Switch  
The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and  
"WASH" to activate the water pump when cleaning and sanitizing.  
22  
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III.Technical Information  
A. Water Circuit and Refrigeration Circuit  
1. KM-2500SWH3 (water-cooled)  
23  
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2. KM-2500SRH3 (remote air-cooled)  
24  
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B. Wiring Diagrams  
1. KM-2500SWH3 (water-cooled), KM-2500SRH3 (remote air-cooled)  
*
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C. Performance Data  
1. KM-2500SWH3 (water-cooled)  
APPROXIMATE ICE  
WATER TEMP. (ºF/ºC)  
70/21  
AMBIENT TEMP.  
PRODUCTION PER 24 HR.  
(ºF/ºC)  
70/21  
80/27  
90/32  
100/38  
70/21  
80/27  
90/32  
100/38  
70/21  
80/27  
90/32  
100/38  
70/21  
80/27  
90/32  
100/38  
70/21  
50/10  
90/32  
2408  
2398  
2395  
2327  
1092  
1088  
1087  
1055  
2395  
2379  
2365  
2323  
1087  
1079  
1073  
1054  
2256  
2172  
2184  
2018  
1024  
985  
991  
915  
lbs./day kg./day  
APPROXIMATE ELECTRIC  
CONSUMPTION  
3510  
3557  
3572  
3566  
3572  
3653  
3720  
3727  
3615  
3673  
3751  
3780  
watts  
APPROXIMATE WATER  
CONSUMPTION PER 24 HR.  
2174  
2325  
2372  
2685  
8.23  
8.80  
2372  
2631  
2847  
2924  
8.98  
9.96  
2679  
2959  
3173  
3473  
10.14  
11.20  
12.01  
13.15  
8.98  
10.78  
11.07  
gal./day m3/day  
10.16  
FREEZING CYCLE TIME  
24  
24  
24  
25  
5.0  
24  
25  
26  
26  
4.4  
26  
27  
28  
30  
4.1  
min.  
HARVEST CYCLE TIME  
80/27  
90/32  
100/38  
4.6  
4.4  
3.8  
3.7  
3.1  
3.1  
3.6  
2.9  
2.7  
min.  
HEAD PRESSURE  
70/21  
80/27  
90/32  
245  
249  
250  
17.2  
17.5  
17.6  
250  
256  
261  
17.6  
18.0  
18.4  
272  
287  
289  
19.1  
20.2  
20.3  
PSIG kg/cm2G  
100/38  
259  
18.2  
267  
18.8  
314  
22.1  
SUCTION PRESSURE  
70/21  
80/27  
90/32  
39  
39  
40  
2.7  
2.8  
2.8  
40  
40  
41  
2.8  
2.8  
2.9  
42  
44  
44  
3.0  
3.1  
3.1  
PSIG kg/cm2G  
100/38  
41  
2.9  
42  
2.9  
47  
3.3  
TOTAL HEAT OF REJECTION FROM CONDENSER  
35,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]  
TOTAL HEAT OF REJECTION FROM COMPRESSOR  
WATER FLOW FOR CONDENSER  
4,900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]  
130 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]  
PRESSURE DROP OF COOLING WATER LINE  
less than 10 PSIG  
Note:  
1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold  
should be used for reference only.  
2. We reserve the right to make changes in specifications and design without prior  
notice.  
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2. KM-2500SRH3 (remote air-cooled)  
APPROXIMATE ICE  
AMBIENT TEMP.  
PRODUCTION PER 24 HR.  
(ºF/ºC)  
WATER TEMP. (ºF/ºC)  
70/21  
50/10  
90/32  
70/21  
80/27  
90/32  
2424  
1100  
1082  
2373  
2306  
1076  
1046  
2196  
2069  
996  
939  
2385  
2373  
2301  
1076  
1044  
2250  
1021  
998  
2035  
1837  
923  
833  
lbs./day kg./day  
100/38  
70/21  
80/27  
90/32  
2200  
APPROXIMATE ELECTRIC  
CONSUMPTION  
3780  
3878  
3909  
3924  
3909  
4079  
4220  
4251  
4048  
4197  
4350  
4470  
watts  
100/38  
70/21  
80/27  
90/32  
APPROXIMATE WATER  
CONSUMPTION PER 24 HR.  
791  
708  
682  
552  
2.99  
2.68  
2.58  
2.09  
682  
538  
419  
408  
2.58  
2.04  
1.58  
1.55  
614  
515  
375  
334  
2.32  
1.95  
1.42  
1.27  
gal./day m3/day  
100/38  
70/21  
80/27  
90/32  
100/38  
70/21  
FREEZING CYCLE TIME  
25  
26  
26  
27  
5.0  
26  
27  
27  
28  
4.3  
28  
30  
30  
32  
4.1  
min.  
HARVEST CYCLE TIME  
80/27  
90/32  
100/38  
4.5  
4.3  
3.6  
3.5  
2.8  
2.8  
3.6  
2.7  
2.7  
min.  
HEAD PRESSURE  
70/21  
80/27  
90/32  
214  
227  
231  
15.0  
15.9  
16.2  
231  
253  
271  
16.2  
17.8  
19.1  
255  
277  
296  
17.9  
19.5  
20.8  
PSIG kg/cm2G  
100/38  
236  
16.6  
277  
19.5  
319  
22.4  
SUCTION PRESSURE  
70/21  
80/27  
90/32  
35  
36  
36  
2.5  
2.5  
2.5  
36  
38  
39  
2.5  
2.7  
2.7  
38  
40  
41  
2.7  
2.8  
2.9  
PSIG kg/cm2G  
100/38  
37  
2.6  
39  
2.8  
43  
3.0  
TOTAL HEAT OF REJECTION FROM CONDENSER  
40,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]  
TOTAL HEAT OF REJECTION FROM COMPRESSOR  
CONDENSER VOLUME  
5,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]  
441 CU. IN (URC-23F)  
Note:  
1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold  
should be used for reference only.  
2. We reserve the right to make changes in specifications and design without prior  
notice.  
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IV. Service Diagnosis  
WARNING  
1. This unit should be diagnosed and repaired only by qualified service  
personnel to reduce the risk of death, electric shock, serious injury, or fire.  
2. Risk of electric shock. Use extreme caution and exercise safe electrical  
practices.  
3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.  
4. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews  
are securely in place after the unit is serviced. Make sure that none have  
fallen into the storage bin.  
5. Make sure all food zones in the icemaker and storage bin are clean after  
the unit is serviced. For cleaning procedures, see "VI. Cleaning and  
Maintenance."  
A. Diagnostic Procedure  
The diagnostic procedure is basically a sequence check which can be used at unit  
startup or for system diagnosis. This procedure allows you to diagnose electrical system  
and component failures in normal operating conditions of 70°F (21°C) or warmer air and  
50°F (10°C) or warmer water temperatures. Before conducting the diagnostic procedure,  
check for correct installation, proper voltage per unit nameplate, and adequate water  
supply. The maximum allowable voltage variation is 10 percent of the nameplate  
rating. Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, & 10 are  
in the factory default position. S4 dip switch 1, 2, 5, & 6 are cleaning adjustments and  
the settings are flexible. For factory default settings, see "II.C.4.a) Default Dip Switch  
Settings." Check CB using the steps in "IV.B. Control Board Check." As you go through  
the diagnostic procedure, check to assure the components energize and de-energize  
correctly. If not, those components or controls are suspect. Always choose a white (W)  
neutral wire to establish a good neutral connection when checking high voltages.  
1) Turn off the power supply, then access the control box. Clear any ice from BC.  
2) Turn on the power supply, then move the control switch to the "ICE" position. A 5-second  
delay occurs. The red "POWER OK" LED on CB comes on.  
3) 1-Minute Fill Cycle – LED 4 is on. WV energizes. After 1 minute, CB checks for a  
closed F/S. If F/S is closed, harvest cycle begins. If closed, continue to step 4. If open,  
WV remains energized through additional 1-minute fill cycles until water fills the tank  
and closes F/S (low water safety). Diagnosis: If WV does not open, check for 115VAC  
at WV terminals. If 115VAC is not present, CB is defective and must be replaced. If  
115VAC is present, check continuity of WV coil, confirm the screen or external filter  
is not plugged (no water flow). If unit fails to start harvest, check for open F/S or bad  
1-minute timer in CB. See "IV.D. Float Switch Check and Cleaning" and "IV.B. Control  
Board Check."  
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4) Initial Harvest Cycle LEDs 1, 4, and 2 are on. WV remains energized. Comp, FMR,  
and HGV energize. WV is energized during harvest for a maximum of six minutes or  
the length of harvest which ever is shorter. LED 4 goes off when WV de-energizes.  
CB monitors the warming of the evaporator via the thermistor located on the suction  
line. When the thermistor warms to 48°F (9°C), CB reads a 3.9 kΩ signal from the  
thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 &  
2). The harvest timer has settings of 60, 90, 120, and 180 seconds. For details, see  
"II.C.4.b) Harvest Timer (S4 dip switch 1 & 2)." When the harvest timer terminates, the  
harvest cycle is complete. CB checks the position of F/S and proceeds to the next cycle  
if it is closed, or calls for a 1-minute fill if it is open. The minimum total time allowed by  
CB for a complete harvest cycle is 2 minutes.  
Diagnosis: Check that WV remains energized, Comp, FMR, and HGV energize.  
Average harvest cycle at factory setting is 2 to 3 minutes. How long does initial harvest  
last? 1.5 minutes after initial harvest begins, touch the Comp discharge line. Is it hot?  
If not, check that Comp is energized, refrigerant pressures are in range, and Comp  
is efficient. If it is hot, place a thermometer on the suction line next to the thermistor.  
Has it warmed to 48°F (9°C)? If not, check that the HGV is energized and open. On  
water-cooled model, check that WRV is not leaking by. If temperature has been reached  
and the freeze cycle fails to start, if not yet confirmed, confirm thermistor status. See  
"IV.E. Thermistor Check." If the thermistor reading is in proper range and CB fails to  
terminate the harvest cycle, CB is bad and must be replaced.  
5) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM and LLV energize.  
WV and HGV de-energize. The unit is held in freeze by a 5-minute short cycle  
protection timer (CB will not accept a signal from F/S). After the 5-minute short cycle  
protection timer terminates, CB turns freeze termination over to F/S.  
Diagnosis: During the first 5 minutes of freeze, confirm the evaporator temperature  
drops. If the evaporator is not cold, confirm that WV and HGV are closed and TXV is  
operating properly. Next, check for proper refrigerant pressures, inefficient Comp, or  
headmaster sticking (remote air-cooled). After 5 minutes in freeze, disconnect black  
F/S connector from CB BLACK K5 connector. If the unit switches out of freeze with  
F/S removed, but would previously not switch out of freeze with F/S connected (long  
freeze - 3 beep alarm), F/S may be sticking. To check and clean F/S, see "IV.D. Float  
Switch Check and Cleaning." If the unit remains in freeze with F/S removed, CB is bad  
and must be replaced. See "V.O. Removal and Replacement of Control Board."  
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and  
conditions. Cycle times and refrigerant pressures should follow performance data  
provided in this manual. See "III.C. Performance Data."  
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6) Pump-Out Cycle (10/20 second pump out) – LEDs 1, 3, and 2 are on. LED 4 is on  
when S4 dip switch 3 & 4 are set to 3 off and 4 on. Comp and FMR remain energized,  
HGV energizes. WV energizes if S4 dip switch 3 off & 4 on. LLV de-energizes. PM stops  
for 2 seconds, then reverses for 10/20 seconds depending on pump-out timer S4 dip  
switch 3 & 4 setting. When pump-out timer terminates, the pump-out is complete. The  
pump-out frequency control is factory set for every cycle. The first pump out occurs after  
the 1st freeze cycle and every cycle thereafter. Generally no adjustment is required. For  
details, see "II.C.4.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."  
Diagnosis: If PM does not reverse, check PM circuit and capacitor. Next, check  
CB 10-pin connector #5 pin dark blue (DBU) wire for 115VAC. If 115VAC is not present,  
CB is bad and must be replaced. If 115VAC is present, check PM continuity. If PM is  
reversing but water does not pump out, check and clean the check valve assembly and  
tubing. If S4 dip switch 3 & 4 are adjusted to 3 off and 4 on, WV energizes.  
7) Normal Harvest Cycle – same as the initial harvest cycle – Return to "IV.A.4) Initial  
Harvest Cycle."  
8) Shutdown  
When the unit is running hold ice in contact with the thermostatic bulb, the thermostatic  
BC switch opens within 10 seconds, shutting down the unit. The bin control is factory  
set, and generally no adjustment is required. However, adjustment may be needed in  
some conditions, particularly at higher altitude locations. CAUTION! Do not adjust  
S4 dip switch 7 out of the factory default position on this model.This dip switch  
must be left in the factory default position or this unit will not operate correctly.  
Diagnosis: See "IV.C. Bin Control Check."  
Note: Unit continues to cycle until bin control is satisfied or power is switched off. The  
unit always restarts at the 1-minute fill cycle.  
Legend: BC–bin control; CB–control board; Comp–compressor; FMR–fan  
motor-remote; F/S–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.);  
LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve;  
WV–inlet water valve  
30  
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B. Control Board Check  
Before replacing a control board that does not show a visible defect and that you suspect  
is bad, always conduct the following check procedure. This procedure will help you verify  
your diagnosis.  
Alarm Reset: If the control board is in alarm (beeping), press the "ALARM RESET"  
button on the control board with power on. Once reset, the unit starts at the  
1-minute fill cycle. For audible alarm information, see "II.C.3. LED Lights  
and Audible Alarm Safeties."  
1) Check the dip switch settings to assure that S4 dip switch #3, 4, 7, 8, 9, & 10 are in  
the factory default position. S4 dip switch 1, 2, 5, & 6 are cleaning adjustments and  
the settings are flexible. For factory default settings, see "II.C.4.a) Default Dip Switch  
Settings."  
2) Move the control switch to the "ICE" position. If the red "POWER OK" LED is on,  
control voltage is good. If the "POWER OK" LED is off, check the control transformer  
secondary circuit. The control transformer secondary circuit includes the cleaning valve  
interlock switch. Make sure the interlock switch is closed; otherwise, no control voltage  
is supplied to the K2 connector. Transformer output is 10.5V at 115V primary input. If  
the secondary circuit has proper voltage and the red LED is off, the control board is bad  
and should be replaced. See "V.O. Removal and Replacement of Control Board."  
If the secondary circuit does not have proper voltage, check the control transformer  
primary circuit. Check for 115V at the control board K1 ten-pin connector. Check the  
#10 pin (BR wire) to a white neutral wire for 115V. Always choose a white neutral wire to  
establish a good neutral connection when checking voltages. For additional checks, see  
"IV.F.1.[1] The icemaker will not start."  
3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control  
switch is in the "ICE" position, then press the "OUTPUT TEST" button. The correct  
lighting sequence is none, 2, 3, 4, 1. Note that the order of the LEDs from the outer  
edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) cycle during the  
test. Following the test, the icemaker resumes operation. If the LEDs do not light as  
described above, the control board is bad and should be replaced. See "V.O. Removal  
and Replacement of Control Board."  
4) To verify voltage output from the control board to the components, slide the control  
board K1 ten-pin connector out far enough to allow multimeter lead contact. With the  
unit in the cycle to be tested, check output voltage from the corresponding pin on the  
control board K1 ten-pin connector to ground. If output voltage is not found and the  
appropriate LED is on, the control board is bad and should be replaced. See "V.O.  
Removal and Replacement of Control Board."  
31  
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C. Bin Control Check  
To check the thermostatic bin control, follow the steps below.  
CAUTION  
When the ambient temperature is below 45°F (7°C), the bin control thermostat  
operates to stop the icemaker even if the ice storage bin is empty. When the  
thermostat is set in the prohibited range, the icemaker operates continuously  
even if the ice storage bin is filled with ice. Setting in the prohibited range may  
result in severe damage to the icemaker.  
The thermostatic bin control is factory set, and generally no adjustment is required.  
However, adjustment may be needed in some conditions, particularly at higher altitude  
locations. Adjust it, if necessary, so that the icemaker stops automatically within  
10 seconds after ice contacts the bin control.  
1) Turn off the power supply.  
2) Remove the front panel, then remove the control box cover.  
3) Disconnect the thermostatic bin control wires from the thermostatic bin control switch.  
4) Clear any ice away from the thermostatic bulb, then hold your hand around the  
thermostatic bulb to warm it up.  
5) Check for continuity across the thermostatic bin control switch. If closed, continue to  
step 6. If open, adjust or replace the thermostatic bin control.  
6) With the multimeter test leads still in place, hold ice on the thermostatic bulb to lower  
the temperature. Within 10 seconds, the thermostatic bin control switch should open (no  
continuity). If it remains closed, adjust or replace the thermostatic bin control.  
D. Float Switch Check and Cleaning  
1. Float Switch Check  
To check the float switch, follow the steps below.  
Separator  
1) Turn off the power supply.  
2) Remove the front panel. Move the control  
Cube Guide  
switch to the "OFF" position, then remove  
the insulation panel.  
Inside of Ice  
Front  
3) Remove the drain plug located on the lower  
front part of the ice dropping hole. Allow the  
water tank to drain. See Fig. 1.  
Dropping Hole  
4) Replace the drain plug in its correct  
position. Be careful not to cross thread it.  
Cap  
5) Remove the control box cover.  
6) Disconnect the black float switch connector from the control board BLACK K5 connector.  
7) Check for continuity across the float switch leads. With the water tank empty, the float  
switch should be open. If open, continue to step 8. If closed, follow the steps in "IV.D.2.  
Float Switch Cleaning." After cleaning the float switch, check it again. Replace if  
necessary.  
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8) Reconnect the black float switch connector, then replace the control box cover in its  
correct position.  
9) Move the control switch to the "ICE" position. Replace the insulation panel and the  
front panel in their correct positions, then turn on the power supply. After 1 minute, the  
1-minute fill cycle should end and the initial harvest cycle should begin. If the initial  
harvest cycle begins, the float switch is good and the check is complete. If the initial  
harvest cycle does not begin, continue to step 10.  
10) Turn off the power supply.  
11) Remove the front panel.  
12) Move the control switch to the "OFF" position.  
13) Remove the control box cover.  
14) Disconnect the black float switch connector from the control board BLACK K5 connector.  
15) Check for continuity across the float switch leads. With the water tank full, the float  
switch should be closed. If the float switch is closed and the icemaker will not switch  
from the 1-minute fill cycle to the initial harvest cycle, replace the control board.  
If the float switch is open, confirm that the water tank is full. If the tank is not full, check  
the water supply, water filters, and inlet water valve. If the tank is full, follow the steps in  
"IV.D.2. Float Switch Cleaning." After cleaning the float switch, check it again. Replace if  
necessary.  
2. Float Switch Cleaning  
Depending on local water conditions, scale may build up on the float switch. Scale on the  
switch can cause the float to stick. In this case, the float switch should be cleaned.  
1) Turn off the power supply.  
2) Remove the front panel and move the control switch to the "OFF" position.  
3) Remove the insulation panel, then remove the cap located on the front bottom part of  
the ice dropping hole. Drain the water tank.  
Vent  
4) Replace the cap in its correct position. Be  
careful not to cross thread it.  
Flush  
5) Disconnect the vent tube and the flush  
tube from the top of the float switch, then  
remove the float switch assembly from the  
mounting bracket and remove the rubber  
Shaft  
boot from the bottom of the float switch  
assembly. See Fig. 2.  
Float Switch  
Housing  
6) Remove the retainer rod from the bottom of  
the float switch assembly, then remove the  
float. Be careful not to bend the retainer rod  
excessively when removing it.  
Float  
Retainer Rod  
Rubber Boot  
and Hose  
Fig. 2  
33  
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7) Wipe down the float switch assembly's housing, shaft, float, and retainer rod with a  
mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Clean the inside of  
the rubber boot and hose with the cleaning solution. Rinse the parts thoroughly with  
clean water.  
8) Reassemble the float switch assembly and replace it and the rubber boot in their correct  
positions. Reconnect the vent tube and the flush tube.  
9) Move the control switch to the "ICE" position.  
10) Replace the insulation panel and front panel in their correct positions.  
E.Thermistor Check  
To check thermistor resistance, follow the steps below.  
1) Turn off the power supply.  
2) Remove the front panel, then move the control switch to the "OFF" position.  
3) Remove the control box cover.  
4) Remove the thermistor. See "V.K. Removal and Replacement of Thermistor."  
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or  
3 minutes.  
6) Remove the white thermistor connector from the control board WHITE K3 connector  
and check the resistance between thermistor leads. Normal reading is within 4.7 to  
6.2 kΩ. If outside the normal reading, replace the thermistor. If inside the normal  
reading, continue to the next step.  
7) Replace the thermistor in its correct position. See "V.K. Removal Replacement of  
Thermistor."  
8) Reconnect the white thermistor connector to the control board WHITE K3 connector.  
9) Replace the control box cover in its correct position, then turn on the power supply.  
10) Move the control switch to the "ICE" position.  
11) Once the harvest cycle starts, begin timing the harvest cycle.  
12) The harvest timer should expire and terminate the harvest cycle within 2 to 3 minutes. If  
the harvest timer does not expire and terminate the harvest cycle, the harvest timer is  
bad and the control board should be replaced. See "V.O. Removal and Replacement of  
Control Board."  
34  
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F. Diagnostic Charts  
1. No Ice Production  
Problem  
Possible Cause  
Remedy  
[1] The icemaker will not a) Power Supply  
start.  
1. Off, blown fuse, or  
tripped breaker.  
1. Turn on, replace, or reset.  
2. Loose connection.  
3. Bad contacts.  
2. Tighten.  
3. Check for continuity and  
replace.  
4. Not within  
4. Refer to nameplate and  
correct.  
specifications.  
b) Transformer (main  
transformer)  
1. Voltage tap switch  
does not match  
1. Verify incoming voltage,  
move switch to proper  
setting.  
incoming voltage.  
2. Coil winding open or 2. Replace.  
shorted.  
c) Water Supply  
1. Water supply off or  
pressure too low.  
1. Check and get  
recommended pressure.  
d) Bin Control Thermostat 1. Tripped with bin filled 1. Remove ice.  
with ice.  
2. Ambient temperature 2. Increase ambient  
too cool.  
temperature.  
3. Set too warm.  
3. See "IV.C. Bin Control  
Check."  
4. Bulb out of position.  
5. Bad contacts.  
4. Place in position.  
5. Check for continuity and  
replace.  
e) Fuse (Control Box)  
f) Control Switch  
1. Blown.  
1. Check for short circuit and  
replace.  
1. "OFF" or "WASH"  
position.  
1. Move to "ICE" position.  
2. Bad contacts.  
2. Check for continuity and  
replace.  
g) High-Pressure Control 1. Bad contacts.  
1. Check for continuity and  
replace.  
2. Dirty air filter or  
condenser.  
2. Clean.  
3. Ambient or condenser 3. Reduce temperature.  
water temperature too  
warm.  
4. Refrigerant  
overcharged.  
4. Recover, evacuate, and  
recharge.  
5. Fan not operating  
(except water-cooled  
model).  
5. See chart 1.[7]  
6. Refrigerant line or  
6. Clean and replace drier.  
components restricted.  
7. Condenser water  
pressure too low or off  
(water-cooled model).  
7. Check and get  
recommended pressure.  
35  
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Problem  
Possible Cause  
Remedy  
[1] The icemaker will not h) Control Transformer  
start. (continued)  
1. Coil winding open or 1. Replace.  
shorted.  
i) Wiring to Control Board 1. Loose connections or 1. Check for continuity and  
open.  
replace.  
j) Interlock Switch  
(Cleaning Valve)  
1. Open position.  
2. Bad contacts.  
1. Move to closed position.  
2. Check for continuity and  
replace.  
k) Thermistor  
1. Leads shorted or open 1. See "IV.E. Thermistor  
and high temperature  
or harvest backup  
timer safety operates  
(1 beep or 2 beep  
alarm).  
Check."  
l) Hot Gas Valve  
1. Continues to open  
in freeze cycle and  
freeze timer safety  
operates (3 beep  
alarm).  
1. Check for hot gas valve  
stuck open and replace.  
m)Inlet Water Valve  
1. Mesh filter or orifice  
gets clogged and  
water supply cycle  
does not finish.  
1. Clean.  
2. Coil winding open.  
2. Replace.  
3. Wiring to inlet water  
valve.  
3. Check for loose  
connection or open, and  
replace.  
n) Float Switch  
1. Bad contacts.  
1. Check for continuity and  
replace.  
2. Float does not move 2. Clean or replace.  
freely.  
o) Control Board  
a) Water Supply  
b) Float Switch  
1. Defective or in alarm. 1. See "IV.B. Control Board  
Check."  
[2] Fill cycle will not  
terminate.  
1. Water supply off or  
pressure too low.  
1. Check and get  
recommended pressure.  
1. Connector  
disconnected.  
1. Reconnect.  
2. Defective switch.  
2. Check and replace.  
3. Float does not move 3. See "IV.D. Float Switch  
freely.  
Check and Cleaning."  
c) Control Board  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
[3] Compressor will  
not start or stops  
operating.  
a) Magnetic Contactor  
1. Bad contacts.  
1. Check for continuity and  
replace.  
2. Coil winding open.  
2. Replace.  
1. Replace.  
b) Start Capacitor or Run 1. Defective.  
Capacitor  
36  
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Problem  
Possible Cause  
Remedy  
[3] Compressor will  
not start or stops  
c) Internal Overload  
Protector Open (check  
1 through 3 to the right  
1. Loose terminal.  
2. Voltage.  
1. Tighten or replace.  
2. Check and correct.  
3. Clean.  
operating. (continued)  
and d through f below) 3. Dirty condenser.  
d) Starter  
1. Bad contacts.  
1. Check and replace.  
2. Replace.  
2. Coil winding open.  
e) Compressor  
1. Power supply not  
within specifications.  
1. Refer to nameplate and  
correct.  
2. Wiring to compressor. 2. Check for loose  
connection or open, and  
replace.  
3. Defective.  
3. Replace.  
4. Protector tripped.  
4. Reduce temperature.  
f) Control Board  
1. No power to contactor. 1. See "IV.B. Control Board  
Check."  
[4] Water continues to  
be supplied in freeze  
cycle.  
a) Water Pressure  
b) Inlet Water Valve  
1. Too high.  
1. Reduce.  
1. Diaphragm does not 1. Check for water leaks with  
close.  
icemaker off.  
c) Control Board  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
[5] Pump motor will not a) Pump Motor  
start.  
1. Motor winding open. 1. Replace.  
2. Bearing worn out. 2. Replace.  
3. Wiring to pump motor. 3. Check for loose  
connection or open, and  
replace.  
4. Defective capacitor.  
4. Replace.  
5. Defective or bound  
impeller.  
5. Replace and clean.  
6. Mechanical seal worn 6. Check and replace.  
out.  
b) Control Board  
c) Control Switch  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
1. Bad contacts.  
1. Replace.  
[6] Freeze cycle time is a) Pump Out Check Valve 1. Leaking by.  
too short.  
1. Clean or replace.  
1. Clean or replace.  
b) Float Switch  
c) Control Board  
d) Water System  
a) Fan Motor  
1. Dirty or erratic  
operation.  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
1. Water leaks.  
1. Check connections for  
water leaks, and replace.  
[7] Fan motor will  
not start, or is not  
operating (except  
water-cooled model).  
1. Motor winding open. 1. Replace.  
2. Bearing worn out.  
3. Wiring to fan motor.  
2. Replace.  
3. Check for loose  
connection or open, and  
replace.  
4. Defective capacitor.  
5. Fan blade bound.  
4. Replace.  
5. Check and replace.  
37  
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Problem  
Possible Cause  
Remedy  
[7] Fan motor will  
not start, or is not  
operating (except  
water-cooled model).  
(continued)  
b) Control Board  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
[8] All components  
run, but no ice is  
produced.  
a) Refrigerant  
1. Low charge.  
1. Check for leaks. Recover,  
repair, evacuate, and  
recharge.  
2. Air or moisture  
trapped.  
2. Replace drier, evacuate,  
and recharge.  
b) Compressor  
1. Defective.  
1. Replace.  
c) Hot Gas Valve  
1. Continues to open in 1. Check and replace.  
freeze cycle.  
d) Liquid Line Valve  
(if applicable)  
1. Continues to close in 1. Check and replace.  
freeze cycle.  
e) Inlet Water Valve  
1. Inlet water valve is  
wide open during  
freeze.  
1. Check for water leaks with  
icemaker off.  
f) Expansion Valve  
1. Bulb loose.  
1. Secure bulb.  
2. Operating erratically. 2. Check and replace.  
g) Headmaster (C.P.R.)  
(remote air-cooled  
model)  
1. Not operating properly 1. Replace headmaster.  
and liquid line  
temperature too warm.  
h) Water Supply Line  
(water-cooled model)  
1. Condenser water  
pressure too low or  
off and high pressure  
control opens and  
closes frequently.  
1. Check and get  
recommended pressure.  
i) Water Regulating Valve 1. Set too high.  
(water-cooled model)  
1. Adjust or replace. See  
"V.I. Adjustment of Water  
Regulating Valve."  
2. Evaporator is Frozen Up  
Problem  
Possible Cause  
Remedy  
[1]Freeze cycle time is a) Inlet Water Valve  
too long.  
1. Diaphragm does not 1. Check for water leaks with  
close.  
icemaker off.  
b) Float Switch  
1. Float does not move 1. Clean or replace.  
freely.  
2. Defective switch.  
1. Scaled up.  
2. Check and replace.  
1. Clean.  
c) Evaporator  
2. Damaged.  
2. Replace.  
d) Spray Tubes  
1. Dirty.  
1. Clean.  
2. Out of position.  
1. RPM too slow.  
2. Place in Position.  
1. See chart 1. [5].  
e) Water Pump  
f) Thermistor  
1. Loose or  
1. Reattach or connect. See  
"IV.E. Thermistor Check."  
disconnected.  
g) Refrigerant Charge  
1. Low Charge  
1. Check for leaks. Recover,  
repair, evacuate, and  
recharge.  
38  
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Problem  
Possible Cause  
Remedy  
[1]Freeze cycle time is h) Expansion Valve  
too long. (continued)  
1. Bulb loose.  
1. Secure bulb.  
2. Operating erratically. 2. Check and replace.  
i) Control Board  
1. Defective.  
1. See "IV.B. Control Board  
Check."  
[2]All ice formed on  
evaporator does not  
fall into bin in harvest  
cycle.  
a) Evaporator  
1. Scaled up.  
2. Damaged.  
1. Clean.  
2. Replace.  
b) Ambient and/or Water 1. Too cool.  
Temperature  
1. Increase temperature.  
c) Water Supply Line  
1. Water pressure too  
low.  
1. Check and get  
recommended pressure.  
d) Water System  
1. Water supply line too 1. Increase water line size.  
small; requires 3/8"  
OD line dedicated per  
machine.  
2. Water filter clogged or 2. Replace filter or install a  
flow rate too small.  
higher flow rate filter.  
e) Inlet Water Valve  
f) Spray Tubes  
1. Dirty mesh filter or  
orifice.  
1. Clean.  
2. Diaphragm does not 2. Check for water leaks with  
close.  
icemaker off.  
1. Dirty.  
1. Clean.  
2. Out of position.  
2. Place in position.  
g) Thermistor  
1. Loose or  
1. Reattach or connect. See  
"IV.E. Thermistor Check."  
disconnected.  
h) Hot Gas Valve  
1. Coil winding open.  
1. Replace.  
2. Replace.  
2. Plunger does not  
move.  
3. Wiring to hot gas  
valve.  
3. Check for loose  
connection or open, and  
replace.  
i) Expansion Valve  
1. Open.  
1. Check and replace.  
j) Liquid Line Valve  
(if applicable)  
1. Continues to open in 1. Check operation in harvest  
harvest cycle.  
cycle and replace.  
k) Control Board  
1. Harvest timer is set  
too short.  
1. Adjust longer, referring to  
"II.C.4.b) Harvest Timer  
(S4 dip switch 1 & 2)."  
2. Defective.  
2. See "IV.B. Control Board  
Check."  
l) Refrigerant Charge  
1. Low Charge  
1. Check for leaks. Recover,  
repair, evacuate, and  
recharge.  
m)Water Regulating Valve 1. Leaking by in harvest. 1. Check and replace.  
(water-cooled model)  
39  
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Problem  
Possible Cause  
Remedy  
[3]Other.  
a) Ice Cube Guide  
1. Out of position.  
1. Place in position.  
1. Place in position.  
b) Bin Control Thermostat 1. Bulb out of position.  
2. Bad contacts.  
2. Check for continuity and  
replace.  
3. Low Ice Production  
Problem  
Possible Cause  
Remedy  
[1] Freeze cycle time is a) Inlet Water Valve  
long.  
1. Diaphragm does not 1. Check for water leaks with  
close.  
icemaker off.  
b) Float Switch  
1. Float switch does not 1. Clean or replace.  
move freely.  
2. Defective switch.  
1. Scaled up.  
2. Check and replace.  
1. Clean.  
c) Evaporator  
d) Spray Tubes  
e) Water Pump  
2. Damaged.  
2. Replace.  
1. Dirty.  
1. Clean.  
2. Out of position.  
1. RPM too slow.  
2. Place in Position.  
1. Check and replace.  
f) Condenser (except  
water-cooled model)  
1. Air filter or condenser 1. Clean.  
clogged (except  
water-cooled model).  
g) Refrigerant Charge  
1. Low charge.  
1. Check for leaks. Recover,  
repair, evacuate, and  
recharge.  
h) Hot Gas Valve  
1. Open.  
1. Check and replace.  
1. Secure bulb.  
i) Expansion Valve  
1. Bulb loose.  
2. Operating erratically. 2. Check and replace.  
1. Erratic or off. 1. See chart 1. [3].  
1. Water regulating valve 1. Adjust or replace. See  
j) Compressor  
k) Condenser Water  
(water-cooled model)  
set too high.  
"V.I. Adjustment of Water  
Regulating Valve."  
2. Condenser water  
pressure too low.  
2. Check and get  
recommended pressure.  
3. Water temperature out 3. Correct to specification.  
of specification.  
l) Liquid Line Valve  
1. Erratic, sticking.  
1 Bypassing.  
1. Check and replace.  
1. Replace.  
m)Headmaster (C.P.R.)  
(remote air-cooled  
model)  
n) Control Board  
1. Float switch  
1. Check and reconnect.  
connection loose (K5).  
2. Defective.  
2. See "IV.B. Control Board  
Check."  
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Problem  
Possible Cause  
Remedy  
[2] Harvest cycle time is a) Water Supply  
long.  
1. Water temperature too 1. Increase temperature.  
cold.  
b) Thermistor  
1. Out of position or  
defective.  
1. Reattatch and secure. See  
"IV.E. Thermistor Check."  
c) Control Board  
1. Not reading  
thermistor.  
1. Check and replace.  
2. Sending voltage to  
liquid line valve (if  
2. Check and replace. See  
"IV.B. Control Board  
Check.""  
applicable) in harvest.  
d) Inlet Water Valve  
e) Evaporator  
1. Clogged.  
1. Clean or replace.  
1. Clean.  
1. Scaled up.  
f) Hot Gas Valve  
1. Does not open, or  
opens partially.  
1. Check and replace.  
g) Expansion Valve  
1. Wide open in harvest. 1. Check and replace.  
h) Water Regulating Valve 1. Open during harvest. 1. Adjust or replace. See  
(water-cooled model)  
"V.I. Adjustment of Water  
Regulating Valve."  
i) Liquid Line Valve (if  
applicable)  
1. Open during harvest 1. Check and replace.  
cycle.  
4. Abnormal Ice  
Problem  
Possible Cause  
Remedy  
[1] Small cubes.  
a)Pump Out Check Valve 1. Dirty or worn and  
leaking by.  
1. Clean or replace.  
b)Ice Cube Guide  
1. Out of position.  
Circulated water falls  
into bin.  
1. Place in position.  
c) Water System  
1. Water supply line too 1. Increase water line size.  
small; requires 3/8"  
OD line dedicated per  
machine.  
2. Water filter clogged or 2. Replace filter or install a  
flow rate too small.  
higher flow rate filter.  
d)Inlet Water Valve  
1. Dirty mesh filter or  
orifice.  
1. Clean.  
e)Pump Motor  
1. RPM too slow.  
1. Defective.  
1. See chart 1.[5].  
f) Control Board  
1. See "IV.B. Control Board  
Check."  
41  
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[2] Cloudy or irregular  
cubes.  
a)Evaporator  
1. Frozen up.  
1. See "IV.F.2. Evaporator is  
Frozen Up."  
2. Scaled up.  
3. Damaged.  
2. Clean  
3. Replace.  
b)Water System  
1. Water supply line too 1. Increase water line size.  
small; requires 1/2"  
nominal line dedicated  
per machine.  
2. Water filter clogged or 2. Replace filter or install a  
flow rate too small.  
higher flow rate filter.  
3. High hardness or  
contains impurities.  
3. Install a water softener or  
filter.  
c) Spray Guide  
1. Dirty.  
1. Clean.  
5. Other  
Problem  
Possible Cause  
Remedy  
[1]Icemaker will not stop a)Bin Control Thermostat 1. Set too cold.  
when bin is filled with  
1. See "II.D. Bin Control."  
2. Defective.  
2. Replace.  
ice.  
[2] Abnormal noise.  
a)Pump Motor  
1. Bearings worn out.  
1. Bearings worn out.  
1. Replace.  
1. Replace.  
b)Fan Motor (except  
water-cooled model)  
2. Fan blade deformed. 2. Replace.  
3. Fan blade does not  
move freely.  
3. Replace.  
c) Compressor  
1. Bearings worn out or 1. Replace.  
cylinder valve broken.  
2. Mounting pad out of  
position.  
2. Reinstall.  
d)Refrigerant Lines  
1. Rub or touch other  
lines or surfaces.  
1. Reposition.  
[3]Ice in storage bin  
often melts.  
a)Drain Line(s)  
1. Plugged.  
1. Clean.  
b)Icemaker and Bin  
1. Drains not run  
separately.  
1. Separate the drain lines.  
c) Ice Cube Guide  
1. Out of position.  
Circulated water falls  
into bin.  
1. Place in position.  
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V. Removal and Replacement of Components  
WARNING  
1. This unit should be diagnosed and repaired only by qualified service  
personnel to reduce the risk of death, electric shock, serious injury, or fire.  
2. Move the control switch to the "OFF" position and turn off the power supply  
before servicing.  
3. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews  
are securely in place after the unit is serviced. Make sure that none have  
fallen into the storage bin.  
4. Make sure all food zones in the icemaker and storage bin are clean after  
the unit is serviced. For cleaning procedures, see "VI. Cleaning and  
Maintenance."  
A. Service for Refrigerant Lines  
WARNING  
1. Repairs requiring the refrigeration circuit to be opened must be performed by  
properly trained and EPA-certified service personnel.  
2. Always recover the refrigerant and store it in an approved container. Do not  
discharge the refrigerant into the atmosphere.  
3. Use an electronic leak detector or soap bubbles to check for leaks. Add a  
trace of refrigerant to the system (if using an electronic leak detector), and  
then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A  
as a mixture with pressurized air for leak testing.  
CAUTION  
1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture  
quickly. Therefore it is important to prevent moisture from entering the system  
when replacing or servicing parts.  
2. Always install a new drier every time the sealed refrigeration system is  
opened.  
3. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
4. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
5. Do not leave the system open for longer than 15 minutes when replacing or  
servicing parts.  
1. Refrigerant Recovery  
The icemaker is provided with refrigerant service valves. Using proper refrigerant  
practices, recover the refrigerant from the service valves and store it in an approved  
container. Do not discharge the refrigerant into the atmosphere.  
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2. Brazing  
WARNING  
1. R-404A itself is not flammable at atmospheric pressure and temperatures up  
to 176°F (80°C).  
2. R-404A itself is not explosive or poisonous. However, when exposed to  
high temperatures (open flames), R-404A can be decomposed to form  
hydrofluoric acid and carbonyl fluoride both of which are hazardous.  
3. Do not use silver alloy or copper alloy containing arsenic.  
4. Use an electronic leak detector or soap bubbles to check for leaks. Add a  
trace of refrigerant to the system (if using an electronic leak detector), and  
then raise the pressure using nitrogen gas (140 PSIG). DO NOT use R-404A  
as a mixture with pressurized air for leak testing.  
1) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
Note: Because the pipes in the evaporator case are specially coated to resist corrosion,  
it is important to make connections outside the evaporator case when possible. If  
it is necessary to braze inside the evaporator case, use sandpaper to remove the  
coating from the brazing connections before unbrazing the components.  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
3. Evacuation and Recharge (R-404A)  
1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both  
high and low-side service valves.  
IMPORTANT  
The vacuum level and vacuum pump may be the same as those for current  
refrigerants. However, the rubber hose and gauge manifold to be used for  
evacuation and refrigerant charge should be exclusively for POE oils.  
2) Turn on the vacuum pump. Open the gauge manifold valves. Then, open the high and  
low-side service valves. Never allow the oil in the vacuum pump to flow backwards.  
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends  
on pump capacity.  
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4) Close the low-side valve and high-side valve on the gauge manifold.  
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a  
refrigerant service cylinder. Remember to loosen the connection and purge the air  
from the hose. For water-cooled model, see the nameplate for the required refrigerant  
charge. For remote air-cooled model, see the rating label inside the icemaker. Hoshizaki  
recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard  
700 (latest edition) be used.  
6) A liquid charge is required when charging an R-404A system (to prevent fractionation).  
Place the service cylinder on the scales; if the service cylinder is not equipped with  
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side  
valve on the gauge manifold.  
7) Allow the system to charge with liquid until the proper charge weight is met.  
8) If necessary, add any remaining charge to the system through the low-side.  
CAUTION! To prevent compressor damage, use a throttling valve or liquid  
dispensing device to add the remaining liquid charge through the low-side  
service valve with the unit running.  
9) Close the service valves, then close the gauge manifold valves and disconnect the  
hoses.  
10) Cap the service valves to prevent a possible leak.  
B. Removal and Replacement of Compressor  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels.  
3) Recover the refrigerant and store it in an approved container.  
4) Remove the terminal cover on the compressor and disconnect the compressor wiring.  
On remote air-cooled model, disconnect the crankcase heater.  
5) Remove the hold-down bolts, washers, and rubber grommets.  
6) Remove the discharge and suction pipes.  
7) Remove the compressor. Unpack the new compressor package.  
8) Attach the rubber grommets of the prior compressor.  
9) Place the compressor in position and secure it using the bolts and washers.  
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10) Remove the drier, then place the new drier in position.  
11) Remove the plugs from the suction, discharge, and process pipes.  
12) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
13) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
14) Evacuate the system and charge it with refrigerant. For water-cooled model, see the  
nameplate for the required refrigerant charge. For remote air-cooled models, see the  
rating label inside the icemaker.  
15) Connect the terminals and replace the terminal cover in its correct position. On remote  
air-cooled model, connect the crankcase heater.  
16) Replace the panels in their correct positions.  
17) Turn on the power supply.  
C. Removal and Replacement of Expansion Valve  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the valve body and drier by using wet cloths to prevent  
the valve body and drier from overheating. Do not allow the drier to exceed  
250°F (121°C).  
IMPORTANT  
Sometimes moisture in the refrigeration circuit exceeds the drier capacity and  
freezes up at the expansion valve.  
1) Turn off the power supply.  
2) Remove the panels.  
3) Recover the refrigerant and store it in an approved container.  
4) Remove the insulation and the expansion valve bulb on the suction line.  
5) Remove the expansion valve cover and disconnect the expansion valve. Place the new  
expansion valve in position.  
6) Remove the drier, then place the new drier in position.  
7) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
8) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
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9) Evacuate the system, and charge it with refrigerant. For water-cooled model, see the  
nameplate for the required refrigerant charge. For remote air-cooled model, see the  
rating label inside the icemaker.  
10) Attach the expansion valve bulb to the suction line in the same location as the previous  
bulb. The bulb should be placed between the 10 o'clock and 2 o'clock position on the  
tube. Be sure to secure the bulb with the clamp and holder and to insulate it.  
11) Place the expansion valve cover in position.  
12) Replace the panels in their correct positions.  
13) Turn on the power supply.  
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve  
CAUTION  
1. Always use a copper tube of the same diameter and length when replacing  
the valve lines; otherwise, performance may be affected.  
2. Always replace the strainer when replacing the hot gas valve.  
3. Always install a new drier every time the sealed refrigeration system is  
opened.  
4. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
5. When brazing, protect the valve body and drier by using wet cloths to prevent  
the valve body and drier from overheating. Do not allow the drier to exceed  
250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels.  
3) Recover the refrigerant and store it in an approved container.  
4) Remove the bolt and the solenoid.  
5) Disconnect the valve. If replacing the hot gas valve, also remove the strainer.  
6) Place the new valve and strainer (if applicable) in position.  
7) Remove the drier, then place the new drier in position.  
8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
10) Evacuate the system, and charge it with refrigerant. For water-cooled model, see the  
nameplate for the required refrigerant charge. For remote air-cooled model, see the  
rating label inside the icemaker.  
11) Cut the leads of the solenoid allowing enough lead length to reconnect using closed  
end connectors.  
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12) Connect the new solenoid leads.  
13) Attach the solenoid to the valve body and secure it with the bolt.  
14) Replace the panels in their correct positions.  
15) Turn on the power supply.  
E. Removal and Replacement of Evaporator  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels and the front and top insulation.  
3) Recover the refrigerant and store it in an approved container.  
4) Remove the spray tubes. Remove the insulation at the notch where the refrigeration  
tubing passes through the molded chassis.  
5) Disconnect the evaporator tubing.  
Note: The pipes in the evaporator case are specially coated to resist corrosion. Use  
sandpaper to remove the coating from the brazing connections before unbrazing.  
6) Remove the pop rivets securing the evaporator, then lift out the evaporator.  
7) Install the new evaporator.  
8) Remove the drier, then place the new drier in position.  
9) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
10) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
11) Evacuate the system, and charge it with refrigerant. For water-cooled model, see the  
nameplate for the required refrigerant charge. For remote air-cooled model, see the  
rating label inside the icemaker.  
12) Replace the removed parts in the reverse order of which they were removed.  
13) Replace the top insulation and the panels in their correct positions.  
14) Turn on the power supply.  
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F. Removal and Replacement of Water-Cooled Condenser  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels.  
3) Close the condenser water supply line shut-off valve. If connected to a closed loop water  
supply, also close the condenser return outlet shut-off valve.  
4) Open the condenser water supply line drain valve. If connected to a closed loop water  
supply, also open the condenser return outlet drain valve.  
5) Attach a compressed air or carbon dioxide supply to the condenser water supply line  
drain valve.  
6) Open the water regulating valve by using a screwdriver to pry up on the spring retainer  
underneath the spring. While holding the valve open, blow out the condenser using the  
compressed air or carbon dioxide supply until water stops coming out.  
7) Recover the refrigerant and store it in an approved container.  
8) Disconnect the condenser water inlet and outlet piping and the refrigeration inlet and  
outlet piping at the condenser.  
9) Remove the old condenser and install the new condenser.  
10) Remove the drier, then place the new drier in position.  
11) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
12) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
13) Evacuate the system, and charge it with refrigerant. See the nameplate for the required  
refrigerant charge.  
14) Close the drain valve(s). Open the condenser water supply line shut-off valve. If  
connected to a closed loop water supply, also open the condenser return outlet shut-off  
valve.  
15) Check for water leaks.  
16) Replace the panels in their correct positions.  
17) Turn on the power supply.  
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G. Removal and Replacement of Remote Air-Cooled Condenser  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the icemaker panels.  
3) Recover the refrigerant and store it in an approved container.  
4) Remove the condenser unit panels.  
5) Disconnect the condenser inlet and outlet piping.  
6) Remove the screws securing the condenser to the base of the unit, then remove the  
condenser.  
7) Remove the shroud from the condenser and attach to the new condenser.  
8) Install the new condenser.  
9) Remove the drier (located in the icemaker), then place the new drier in position.  
10) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
11) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
12) Evacuate the system, and charge it with refrigerant. See the rating label inside the  
icemaker for the required refrigerant charge.  
13) Replace the removed parts in the reverse order of which they were removed.  
14) Replace the panels in their correct positions.  
15) Turn on the power supply.  
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H. Removal and Replacement of Water Regulating Valve  
(water-cooled model)  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the drier by using a wet cloth to prevent the drier from  
overheating. Do not allow the drier to exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels.  
3) Close the condenser water supply line shut-off valve. If connected to a closed loop  
water supply, also close the condenser return outlet shut-off valve.  
4) Open the condenser water supply line drain valve. If connected to a closed loop water  
supply, also open the condenser return outlet drain valve.  
5) Attach a compressed air or carbon dioxide supply to the condenser water supply line  
drain valve.  
6) Open the water regulating valve by using a screwdriver to pry up on the spring retainer  
underneath the spring. While holding the valve open, blow out the condenser using the  
compressed air or carbon dioxide supply until water stops coming out.  
7) Recover the refrigerant and store it in an approved container.  
8) Disconnect the capillary tube at the condenser outlet.  
9) Disconnect the flare-connections of the valve.  
10) Remove the screws and the valve from the bracket.  
11) Install the new valve.  
12) Remove the drier, then place the new drier in position.  
13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
14) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
15) Evacuate the system, and charge it with refrigerant. See the nameplate for the required  
refrigerant charge.  
16) Connect the flare-connections.  
17) Close the drain valve(s). Open the condenser water supply line shut-off valve. If  
connected to a closed loop water supply, also open the condenser return outlet shut-off  
valve.  
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18) Check for water leaks.  
19) Replace the panels in their correct positions.  
20) Turn on the power supply.  
I. Adjustment of Water Regulating Valve - Water-Cooled Model  
The water regulating valve (also called "water regulator") is factory-adjusted. No adjustment  
is required under normal use. Adjust the water regulator, if necessary, using the following  
procedures.  
1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure  
gauge to the high-side line of the system.  
Adjustment  
Screw  
2) Five minutes after a freeze cycle starts,  
confirm that the thermometer reads 104°F  
to 115°F (40°C to 46°C). If it does not,  
CW – Lower  
CCW – Higher  
rotate the adjustment screw by using a flat  
blade screwdriver until the temperature is  
Top View  
in the proper range. See Fig. 3. Next, check  
that the reference pressure is in the range  
indicated in the Head Pressure table in  
the Performance Data section. See "III.C.  
Performance Data." If it is not in the proper  
range, verify the refrigerant charge.  
Fig. 3  
3) Check that the condenser drain temperature is stable.  
J. Removal and Replacement of Headmaster (Condensing Pressure  
Regulator - C.P.R.) - Remote Air-Cooled Model  
CAUTION  
1. Always install a new drier every time the sealed refrigeration system is  
opened.  
2. Do not replace the drier until after all other repair or replacement has been  
made. Install the new drier with the arrow on the drier in the direction of the  
refrigerant flow.  
3. When brazing, protect the headmaster and drier by using wet cloths to  
prevent the headmaster and drier from overheating. Do not allow the drier to  
exceed 250°F (121°C).  
1) Turn off the power supply.  
2) Remove the panels from the remote condenser unit.  
3) Recover the refrigerant and store it in an approved container.  
4) Before heating, break off the stub on the dome to release the dome charge.  
5) Disconnect the headmaster.  
6) Place the new headmaster in position.  
7) Remove the drier, then place the new drier in position.  
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8) Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG.  
9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of  
refrigerant to the system (if using an electronic leak detector), and then raise the  
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with  
pressurized air for leak testing.  
10) Evacuate the system and charge it with refrigerant. See the rating label inside the  
icemaker for the required refrigerant charge.  
11) Replace the panels in their correct positions.  
12) Turn on the power supply.  
K. Removal and Replacement of Thermistor  
This section covers removal and replacement of the thermistor. For a thermistor check  
procedure, see "IV.E. Thermistor Check."  
CAUTION  
1. The thermistor is fragile; handle very carefully.  
2. Always use the recommended sealant (high thermal conductive type), Model  
KE4560RTV manufactured by SHINETSU SILICONE, Part Code 60Y000-11,  
or Part Code 4A0683-01 or equivalent.  
3. Always use the recommended foam insulation (non-absorbent type) or  
equivalent.  
4. Do not shorten or cut the thermistor leads.  
1) Turn off the power supply.  
2) Remove the panels.  
3) Remove the control box cover.  
4) Disconnect the white thermistor connector from the control board WHITE K3 connector.  
5) Remove the plastic cable ties, foam insulation, thermistor holder, and thermistor. See  
Fig. 4.  
Thermistor Lead  
Cable Tie  
6) Scrape away the old sealant on the  
thermistor holder and the suction pipe.  
7) Wipe off moisture or condensation on the  
suction pipe.  
8) Smoothly apply recommended sealant  
(KE4560RTV, Part Code 60Y000-11  
or 4A0683-01) to the thermistor holder  
concave.  
9) Attach the new thermistor to the suction  
pipe in the same position as the previous  
thermistor. Be very careful to prevent  
damage to the leads. Secure it using the  
thermistor holder and recommended foam  
insulation.  
Foam Insulation  
Thermistor Holder  
Fig. 4  
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10) Secure the insulation using the plastic cable ties.  
11) Connect the white thermistor connector through the bushing of the control box to the  
control board WHITE K3 connector. CAUTION! Do not shorten or cut the thermistor  
leads.  
12) Replace the control box cover and the panels in their correct positions.  
13) Turn on the power supply.  
L. Removal and Replacement of Fan Motor – Remote Air-Cooled Model  
Note: When replacing a fan motor, it is recommended that a new capacitor be installed.  
1) Turn off the power supply.  
2) Remove the remote condenser unit panels.  
3) Remove the junction box cover from the remote condenser unit.  
4) Disconnect the fan motor wires.  
5) Remove the fan motor bracket and fan motor.  
6) Install the new fan motor, connect the fan motor wires, and replace the removed parts in  
the reverse order of which they were removed.  
7) Replace the junction box cover in its correct position.  
8) Replace the panels in their correct positions.  
9) Turn on the power supply.  
M. Removal and Replacement of Inlet Water Valve  
1) Turn off the power supply.  
2) Close the icemaker water supply line shut-off valve. Open the icemaker water supply  
line drain valve.  
3) Remove the front panel.  
4) Disconnect the valve outlet tubing by releasing the clamp.  
5) Loosen the fitting nut. Be careful not to lose the washer.  
6) Disconnect the terminals from the inlet water valve.  
7) Remove the bracket and valve from the unit.  
8) Install the new valve. Replace the removed parts in the reverse order of which they were  
removed. Make sure the washer is in place in the fitting nut.  
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9) Close the icemaker water supply line drain valve. Open the icemaker water supply line  
shut-off valve.  
10) Turn on the power supply.  
11) Check for leaks.  
12) Replace the front panel in its correct position.  
N. Removal and Replacement of Pump Moto
1) Turn off the power supply.  
2) Remove the front panel.  
3) Drain the water tank by removing the cap  
located on the front bottom part of the ice  
dropping hole. See Fig. 5.  
Separator  
Cube Guide  
4) Replace the cap in its correct position. Be  
careful not to cross thread the cap.  
Inside of Ice  
Dropping Hole  
Front  
5) Disconnect the pump suction and discharge hoses.  
6) Remove the closed end connectors from  
the pump motor leads.  
7) Remove the two screws and the pump motor bracke
8) Remove the pump housing and check the impeller.  
9) If the impeller is defective, install a new impeller.  
Cap  
Fig. 5  
10) Install the new motor or new parts, and replace the removed parts in the reverse order  
of which they were removed.  
11) Turn on the power supply and check for leaks.  
12) Replace the front panel in its correct position.  
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O. Removal and Replacement of Control Board  
CAUTION  
1. The control board is fragile; handle very carefully.  
2. The 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 control board.  
3. Do not touch the electronic devices on the control board or the back of the  
control board.  
4. Do not change wiring and connections. Do not misconnect K3, K4, and  
K5, because the same connector is used for the thermistor and float switch.  
K4 is not connected.  
5. Always replace the whole control board assembly if it goes bad.  
6. Do not short out power supply to test for voltage.  
1) Turn off the power supply.  
2) Remove the front panel and the control box cover.  
3) Disconnect the control board connectors from the control board.  
4) Remove the control board.  
5) Adjust the dip switches on the new control board to the factory default settings. See  
"II.C.4.a) Default Dip Switch Settings." CAUTION! Do not adjust S4 dip switch 7 out  
of the factory default position on this model.This dip switch must be left in the  
factory default position or this unit will not operate correctly.  
6) Install the new control board taking care not to damage it.  
7) Connect the control board connectors to the new control board.  
8) Replace the control box cover and front panel in their correct positions.  
9) Turn on the power supply.  
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VI. Cleaning and Maintenance  
IMPORTANT  
Ensure all components, fasteners, and thumbscrews are securely in place after  
any cleaning or maintenance is done to the equipment.  
A. Cleaning and Sanitizing Instructions  
WARNING  
1. Hoshizaki recommends cleaning this icemaker at least once a year. More  
frequent cleaning, however, may be required in some existing water  
conditions.  
2. To prevent injury to individuals and damage to the icemaker, do not use  
ammonia type cleaners.  
3. Always wear liquid-proof gloves to prevent the cleaning and sanitizing  
solutions from coming into contact with skin.  
4. Carefully follow any instructions provided with the bottles of cleaning and  
sanitizing solution.  
5. Never run the icemaker when the water tank is empty.  
IMPORTANT  
1. The cleaning valve is used to allow solution flow to the inside of the  
evaporator during the cleaning and sanitizing operation. It should be closed  
for all icemaking operation. The compressor will not operate unless this valve  
is completely closed.  
2. To open the cleaning valve, the valve handle should be parallel to the valve  
body. To close the valve, the valve handle should be at a right angle to the  
valve body.  
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1. Cleaning Procedure  
1) Dilute 38 fl. oz. (1,124 ml) of recommended cleaner Hoshizaki "Scale Away" with 7 gal.  
(26 l) of warm water.  
2) Remove all ice from the evaporator and the storage bin.  
Note: To remove cubes on the evaporator, turn off the power supply and turn it back on  
after 3 minutes. The harvest cycle starts and the cubes will be removed from the  
evaporator.  
3) Turn off the power supply.  
4) Remove the front panel, and then remove  
the insulation panel by first removing the  
thumbscrew, lifting up the panel slightly and  
pulling it towards you.  
Separator  
Cube Guide  
Front  
Inside of Ice  
Dropping Hole  
5) Remove the cap located on the front  
bottom part of the ice dropping hole. Drain  
the water tank. See Fig. 6.  
Fig. 6  
6) Replace the cap in its correct position. Be  
careful not to cross thread it.  
Cap  
7) In bad or severe water conditions, clean the float switch assembly as described below.  
Otherwise, continue to step 8.  
a. Disconnect the vent tube and the flush tube from the top of the float switch, then  
remove the float switch assembly from the mounting bracket and remove the rubber  
boot from the bottom of the assembly.  
b. Remove the retainer rod from the bottom of the float switch assembly, then remove  
the float. Be careful not to bend the retainer rod excessively when removing it.  
c. Wipe down the float switch assembly's housing, shaft, float, and retainer rod with  
cleaning solution. Clean the inside of the rubber boot and hose with cleaning  
solution. Rinse the parts thoroughly with clean water.  
d. Reassemble the float switch assembly and replace it and the rubber boot in their  
correct positions. Reconnect the vent tube and the flush tube.  
8) Pour the cleaning solution into the water tank.  
9) Fully open the cleaning valve on the left side wall of the machine compartment.  
10) Move the control switch on the control box to the "WASH" position.  
11) Replace the insulation panel and the front panel in their correct positions.  
12) Turn on the power supply to start the washing process.  
13) Turn off the power supply after 30 minutes.  
14) Remove the front panel and the insulation panel.  
15) Remove the cap located on the front bottom part of the ice dropping hole. Drain the  
water tank. Replace the cap and the insulation panel in their correct positions.  
16) Move the control switch to the "ICE" position.  
17) Close the cleaning valve.  
Note: The icemaker will not operate unless the cleaning valve is completely closed.  
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18) Replace the front panel in its correct position.  
19) Turn on the power supply to fill the water tank with water.  
20) Turn off the power supply after 3 minutes.  
21) Remove the front panel and fully open the cleaning valve.  
22) Move the control switch to the "WASH" position.  
23) Replace the front panel in its correct position.  
24) Turn on the power supply to rinse off the cleaning solution.  
25) Turn off the power supply after 5 minutes.  
26) Remove the front panel and the insulation panel.  
27) Remove the cap located on the front bottom part of the ice dropping hole. Drain the  
water tank. Replace the cap and the insulation panel in their correct positions.  
Note: Do not replace the insulation panel when you proceed to "2. Sanitizing  
Procedure."  
28) Repeat steps 16 through 27 three more times to rinse thoroughly.  
Note: If you do not sanitize the icemaker, go to step 9 in "2. Sanitizing Procedure."  
2. Sanitizing Procedure - Following Cleaning Procedure  
1) Dilute 3.5 fl. oz. (104 ml or 7 tbs) of a 5.25% sodium hypochlorite solution (chlorine  
bleach) with 7 gal. (26 l) of warm water.  
2) Pour the sanitizing solution into the water tank.  
3) Replace the insulation panel and the front panel in their correct positions.  
Note: Make sure that the control switch is in the "WASH" position and the cleaning valve  
is open.  
4) Turn on the power supply to start the sanitizing process.  
5) Turn off the power supply after 15 minutes.  
6) Remove the front panel and the insulation panel.  
7) Remove the cap located on the front bottom part of the ice dropping hole. Drain the  
water tank. Replace the cap and the insulation panel in their correct positions.  
8) Repeat steps 16 through 27 in "1. Cleaning Procedure" two times to rinse thoroughly.  
9) Close the cleaning valve.  
10) Move the control switch to the "ICE" position.  
11) Replace the front panel in its correct position.  
12) Clean the storage bin using a neutral cleaner. Rinse thoroughly after cleaning.  
13) Turn on the power supply to start the automatic icemaking process.  
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B. Maintenance  
IMPORTANT  
This icemaker must be maintained individually, referring to the instruction  
manual and labels provided with the icemaker.  
1. Stainless Steel Exterior  
To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth. Use a damp  
cloth containing a neutral cleaner to wipe off oil or dirt build up.  
2. Storage Bin and Scoop  
• Wash your hands before removing ice. Use the plastic scoop provided (bin accessory).  
• The storage bin is for ice use only. Do not store anything else in the storage bin.  
• Clean the scoop and the storage bin liner using a neutral cleaner. Rinse thoroughly  
after cleaning.  
3. Condenser (remote air-cooled model only)  
Check the condenser once a year, and clean the coil if required by using a brush or  
vacuum cleaner. More frequent cleaning may be required depending on location.  
C. Preparing the Icemaker for Long Storage  
CAUTION  
1. When storing the icemaker for an extended time or in sub-freezing  
temperatures, follow the instructions below to prevent damage.  
2. To prevent damage to the water pump seal, do not operate the icemaker with  
the control switch in the "WASH" position when the water tank is empty.  
When the icemaker is not used for two or three days, it is sufficient to only move the control  
switch to the "OFF" position, unless the icemaker will be at sub-freezing temperatures.  
1. Remove the water from the icemaker water supply line:  
1) Turn off the power supply, then remove the front panel.  
2) Close the icemaker water supply line shut-off valve and open the icemaker water supply  
line drain valve.  
3) Allow the line to drain by gravity.  
4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line  
drain valve.  
5) Make sure at least 3 minutes have elapsed since you turned off the power supply. Make  
sure the control switch is in the "ICE" position. Replace the front panel in its correct  
position and turn on the power supply.  
6) Blow the icemaker water supply line out using the compressed air or carbon dioxide  
supply.  
7) Close the icemaker water supply line drain valve.  
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2. Drain the water tank:  
1) Turn off the power supply, then remove the front panel. Move the control switch to the  
"OFF" position.  
2) Remove the insulation panel. Remove the cap located on the front bottom part of the ice  
dropping hole. Drain the water tank. See Fig. 7.  
3) Replace the cap and the insulation panel in their correct positions. Be careful not to  
cross thread the cap.  
4) Replace the front panel in its correct position.  
5) Remove all ice from the storage bin. Clean the storage bin using a neutral cleaner.  
Rinse thoroughly after cleaning.  
Separator  
Cube Guide  
Inside of Ice  
Front  
Dropping Hole  
Fig. 7  
Cap  
3. On water-cooled model only, first remove the water from the water-cooled condenser:  
1) Make sure the power supply is off, then remove the front panel and right side panel.  
2) Close the condenser water supply line shut-off valve. If connected to a closed loop water  
supply, also close the condenser return line shut-off valve.  
3) Open the condenser water supply line drain valve. If connected to a closed loop water  
supply, also open the condenser return line drain valve.  
4) Attach a compressed air or carbon dioxide supply to the condenser water supply line  
drain valve.  
5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer  
underneath the spring. While holding the valve open, blow out the condenser using the  
compressed air or carbon dioxide supply until water stops coming out.  
6) Close the drain valve(s), then replace the right side panel and front panel in their correct  
positions.  
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