Hoshizaki America, Inc.
Hoshizaki
Stackable Crescent Cuber
Models
KM-1301SAH-E
KM-1301SWH-E
KM-1301SRH-E
SERVICE MANUAL
“A Superior Degree
of Reliability”
™
Number: 73181
Issued: 4-12-2011
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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-1301SAH-E (air-cooled)..................................................................................... 6
2. KM-1301SWH-E (water-cooled)............................................................................... 7
3. KM-1301SRH-E (remote air-cooled)........................................................................ 8
B. Condenser Unit ............................................................................................................. 9
II. General Information..........................................................................................................11
A. Construction.................................................................................................................11
1. KM-1301SAH-E (air-cooled)....................................................................................11
2. KM-1301SWH-E (water-cooled)............................................................................. 12
3. KM-1301SRH-E (remote air-cooled)...................................................................... 13
B. Sequence of Operation ............................................................................................... 14
1. Sequence Cycles and Shutdown ........................................................................... 14
a) 1-Minute Fill Cycle............................................................................................ 14
b) Initial Harvest Cycle ........................................................................................ 14
c) Freeze Cycle .................................................................................................... 15
d) Pump-Out Cycle............................................................................................... 15
e) Harvest Cycle................................................................................................... 15
f) Shutdown.......................................................................................................... 15
2. Sequence Flow Chart............................................................................................ 17
C. Control Board.............................................................................................................. 18
1. Control Board Layout ............................................................................................. 19
a) LED Lights and Audible Alarm Safeties ........................................................... 20
2. Controls and Adjustments...................................................................................... 21
a) Default Dip Switch Settings.............................................................................. 21
b) Harvest Timer (S4 dip switch 1 & 2)................................................................. 21
c) Pump-Out Timer (S4 dip switch 3 & 4)............................................................. 22
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 22
e) Harvest Pump Timer (S4 dip switch 7)............................................................. 23
f) Factory Use (S4 dip switch 8)........................................................................... 23
g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 23
h) Float Switch Control (S5 dip switch 1) ............................................................ 24
i) Refill Counter (S5 dip switch 2 through 5)......................................................... 24
D. Control Switch ............................................................................................................. 24
3
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III. Technical Information...................................................................................................... 25
A. Water Circuit and Refrigeration Circuit........................................................................ 25
1. KM-1301SAH-E (air-cooled)................................................................................... 25
2. KM-1301SWH-E (water-cooled)............................................................................. 26
3. KM-1301SRH-E (remote air-cooled) ...................................................................... 27
B. Wiring Diagrams.......................................................................................................... 28
1. Auxiliary Code T-0, U-0 ......................................................................................... 28
a) KM-1301SAH-E (air-cooled)............................................................................. 28
2. Auxiliary Code U-1 and Later ................................................................................ 29
a) KM-1301SAH-E (air-cooled) ............................................................................ 29
b) KM-1301SWH-E (water-cooled) ...................................................................... 30
c) KM-1301SRH-E (remote air-cooled)................................................................. 31
C. Performance Data ....................................................................................................... 32
1. KM-1301SAH-E (air-cooled)................................................................................... 32
2. KM-1301SWH-E (water-cooled) ............................................................................ 33
3. KM-1301SRH-E (remote air-cooled)...................................................................... 34
IV. Service Diagnosis........................................................................................................... 35
A. Diagnostic Procedure ................................................................................................. 35
B. Control Board Check................................................................................................... 39
C. Bin Control Check ....................................................................................................... 40
1. Thermostatic Bin Control Check: KM-1301SAH-E.................................................. 40
2. Mechanical Bin Control Check and Cleaning: KM-1301SWH-E, KM-1301SRH-E. 40
a) Mechanical Bin Control Check......................................................................... 40
b) Mechanical Bin Control Cleaning..................................................................... 42
D. Float Switch Check and Cleaning ............................................................................... 43
1. Float Switch Check ................................................................................................ 43
2. Float Switch Cleaning............................................................................................ 44
E. Thermistor Check........................................................................................................ 45
F. Adjustment of Water Regulating Valve (water-cooled model) ...................................... 45
G. Diagnostic Charts ....................................................................................................... 46
1. No Ice Production................................................................................................... 46
2. Freeze Up.............................................................................................................. 48
3. Low Ice Production ................................................................................................ 50
V. Replacement of Components .......................................................................................... 51
A. Service for Refrigerant Lines....................................................................................... 51
1. Refrigerant Recovery ............................................................................................. 51
2. Brazing .................................................................................................................. 52
3. Evacuation and Recharge (R-404A)...................................................................... 52
B. Important Notes for Component Replacement............................................................ 54
VI. Cleaning and Maintenance............................................................................................. 55
A. Cleaning and Sanitizing Instructions........................................................................... 55
1. Cleaning Procedure................................................................................................ 55
2. Sanitizing Procedure - Following Cleaning Procedure........................................... 57
B. Maintenance................................................................................................................ 58
C. Preparing the Icemaker for Long Storage ................................................................... 58
4
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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 injury or
damage resulting from improper, incorrect, and unreasonable use.
To reduce the risk of death, electric shock, serious injury, or fire, follow
basic precautions including the following:
• Only qualified service technicians should install, service, and maintain the
icemaker.
• Hard-wired electrical connection is recommended. Electrical connection must
meet national, state, and local electrical code requirements. Failure to meet
these code requirements could result in death, electric shock, serious injury,
fire, 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.
• THE ICEMAKER MUST BE GROUNDED (EARTHED). Failure to properly
ground (earth) the icemaker could result in death or serious injury.
• Move the control switch to the "OFF" position and turn off the power supply
before servicing. Lockout/Tagout to prevent the power supply from being
turned back on inadvertently.
• Do not make any alterations to the unit. Alterations could result in electric
shock, injury, fire, or damage to the unit.
Additional Warning for Remote Air-Cooled Model
• THE REMOTE CONDENSER UNIT MUST BE GROUNDED (EARTHED).
The power supply and ground (earth) wire to the remote condenser unit are
supplied from the icemaker. Failure to properly ground (earth) the remote
condenser unit could result in death or serious injury.
5
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I. Specifications
A. Icemaker
1. KM-1301SAH-E (air-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
220-240/50/1
11.8 A (5 Min. Freeze AT 109°F/WT 59°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
20 A
20 A
Ambient
WATER TEMP. (°F)
Temp. (°F)
50
70
90
lb./day ( kg/day )
Reference without *marks
70
80
90
*1114 (505)
1089 (494)
1082 (491)
1048 (475)
1082 (491)
1039 (471)
*1004 (455)
979 (444)
992 (450)
924 (419)
897 (407)
799 (362)
100
FOR THE EUROPEAN MARKET
ICE CAPACITY lb./day (kg/day)
SHAPE OF ICE
10/10°C
1288 (584)
20/15°C
1151 (522)
30/25°C
1025 (465)
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lb.)
WATER gal./24HR (gal./100 lb.)
EXTERIOR DIMENSIONS (W×D×H)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
29.1 lb. (13.2 kg) 1440 pcs.
N/A
90/70°F
2120 (5.1)
157 (15.6)
70/50°F
1900 (4.1)
537 (48.2)
48"×27-3/8"×27-3/8" (1219×695×695 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 275 lb. (125 kg), Shipping 315 lb. (143 kg)
Permanent - Connection
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
- CONDENSATE DRAIN
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
3/8" OD Tube
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Thermostat
Hermetic, Model CS14K6E-PFJ-237
Air-Cooled, Fin and Tube Type
Vertical Type, Stainless Steel and Copper
Thermostatic Expansion Valve
R404A, 3 lb. 9.1 oz. (1620 g)
High 467 PSIG, Low 230 PSIG
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.
198 - 254V
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.
6
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2. KM-1301SWH-E (water-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
220-240/50/1
10.7 A (5 Min. Freeze AT 109°F/WT 59°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
20 A
20 A
Ambient
WATER TEMP. (°F)
Temp. (°F)
50
70
90
lb./day ( kg/day )
Reference without *marks
70
80
90
*1330 (603)
1310 (594)
1304 (591)
1281 (581)
1304 (591)
1269 (576)
*1240 (562)
1222 (554)
1239 (562)
1189 (539)
1165 (528)
1096 (497)
100
FOR THE EUROPEAN MARKET
ICE CAPACITY lb./day (kg/day)
SHAPE OF ICE
10/10°C
1368 (621)
20/15°C
1324 (601)
30/25°C
1210 (549)
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lb.)
WATER gal./24HR (gal./100 lb.)
WATER COOLED CONDENSER
gal./24HR (gal./100 lb.)
31 lb. (14 kg) 1440 pcs.
N/A
90/70°F
1780 (3.5)
1643 (132.5)
1404 (113.2)
70/50°F
1780 (3.2)
1335 (100.4)
821 (61.7)
EXTERIOR DIMENSIONS (W×D×H)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
48"×27-3/8"×27-3/8" (1219×695×695 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 265 lb. (120 kg), Shipping 315 lb. (143 kg)
Permanent - Connection
Inlet
1/2" FPT
Cond. Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
Cond. Outlet 3/8" FPT
- CONDENSATE DRAIN
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
3/8" OD Tube
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
Water Regulating Valve
Mechanical Level Switch and Timer
Hermetic, Model CS14K6E-PFJ-237
Water-Cooled, Tube in Tube Type
Vertical Type, Stainless Steel and Copper
Thermostatic Expansion Valve
R404A, 2 lb. 10.3 oz. (1200 g)
High 427 PSIG, Low 230 PSIG
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.
198 - 254V
45 -100°F
WATER SUPPLY TEMP.
45 - 90°F
WATER SUPPLY PRESSURE
10 - 113 PSIG
Note: We reserve the right to make changes in specifications and design without prior
notice.
7
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3. KM-1301SRH-E (remote air-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
220-240/50/1
12.3 A (5 Min. Freeze AT 109°F/WT 59°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
20 A
20 A
Ambient
WATER TEMP. (°F)
Temp. (°F)
50
70
90
lb./day ( kg/day )
Reference without *marks
70
80
90
*1270 (576)
1241 (563)
1233 (559)
1211 (549)
1233 (559)
1183 (537)
*1142 (518)
1123 (509)
1160 (526)
1100 (499)
1062 (482)
988 (448)
100
FOR THE EUROPEAN MARKET
ICE CAPACITY lb./day (kg/day)
SHAPE OF ICE
10/10°C
1312 (595)
20/15°C
1286 (583)
30/25°C
1163 (528)
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lb.)
WATER gal./24HR (gal./100 lb.)
EXTERIOR DIMENSIONS (W×D×H)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
32 lb. (14.3 kg) 1440 pcs.
N/A
90/70°F
2070(4.4)
228(20.0)
70/50°F
1950(3.7)
544(42.8)
48"×27-3/8"×27-3/8" (1219×695×695 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 255 lb. (116 kg), Shipping 315 lb. (143 kg)
Permanent - Connection
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
- CONDENSATE DRAIN
- REFRIGERATION
CIRCUIT
3/8" OD Tube
Discharge Line 1-1/16"-12 UNF Fitting (#10 PARKER)
Liquid Line 5/8"-18 UNF Fitting (#6 PARKER)
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Level Switch and Timer
Hermetic, Model CS14K6E-PFJ-279
Air-Cooled Remote, Condenser Unit URC-14FE
Vertical Type, Stainless Steel and Copper
Thermostatic Expansion Valve
Headmaster (C.P.R.) on URC-14FE (190 PSIG)
R404A, 10 lb. 5.8 oz. (4700 g)
(Icemaker 5 lb. 15.2 oz. Cond. Unit 4 lb. 6.5 oz.)
High 467 PSIG, Low 230 PSIG
High Voltage Cut-Out (Internal)
Auto-Reset Overload Protector (Internal)
Auto-Reset High Pressure Control Switch
Float Switch
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
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
Remote Condenser Unit (URC-14FE or Equivalent)
OPERATING CONDITIONS
VOLTAGE RANGE
198 - 254 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.
8
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B. Condenser Unit
1. URC-14FE
Units: mm [in.]
TOP VIEW
935
[36-13/16]
850
[33-15/32]
700
[27-9/16]
AIR FLOW
AIR FLOW
960
[37-13/16]
FRONT VIEW
907.2
[35-11/16]
75
[2-15/16]
309
[12-3/16]
URC FAN MOTOR CONNECTION
7/8" DIA OPENING
9
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SPECIFICATIONS
MODEL: URC-14FE
AC SUPPLY VOLTAGE
FAN MOTOR
115/50/1 (Connection to Icemaker)
115 V Total 2.6FLA 130W
EXTERIOR DIMENSIONS (WxDxH)
DIMENSIONS INCLUDING LEGS (WxDxH)
EXTERIOR FINISH
35-11/16"×15-11/16"×21-15/16" (907.2×398×557.8 mm)
37-13/16"×18-1/8"×36-15/16" (960×460×937.8 mm)
Galvanized Steel
WEIGHT
Net 80 lb. ( 36 kg )
Shipping 87 lb. ( 39 kg )
CONNECTIONS - ELECTRIC
- REFRIGERANT
Permanent - Connection
Discharge Line 1-1/16"-12 UNF Fitting (#10 PARKER)
Liquid Line 5/8"-18 UNF Fitting (#6 PARKER)
Air-Cooled, Fin and Tube Type
CONDENSER
FAN MOTOR PROTECTION
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
Thermal Protection
Headmaster (C.P.R.) (190 PSIG)
R-404A
4 lb. 6.5 oz. (2000 g)
High 467 PSIG
VOLTAGE RANGE
AMBIENT TEMP.
Leg
32.2 Bar
OPERATING CONDITIONS
104 ~ 127V
-20 ~ 122°F
ACCESSORIES -SUPPLIED
2 pcs
8 pcs
8 pcs
Hex Head Bolt w/Washer 8×16
Hex Nut
8
Note: We reserve the right to make changes in specifications and design without prior
notice.
10
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II. General Information
A. Construction
1. KM-1301SAH-E (air-cooled)
Separators
Low-Side Service Valve
High-Side Service Valve
Spray Tubes
Inlet Water Valve
Evaporator Assembly
Expansion Valves
Water Supply Inlet
Junction Box
Hot Gas Valve
Check Valves
Cube Guides
High-Pressure
Switch
Air-Cooled
Condenser
Control Box
Fan Blade
Check Valve
(water)
Water Pump
Fan Motor
Float Switch
Compressor
Drier
Liquid Line Valve
Transformer Box
Control Switch
Thermostatic Bin Control
11
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2. KM-1301SWH-E (water-cooled)
Separators
Spray Tubes
Inlet Water Valve
Low-Side Service Valve
High-Side Service Valve
Expansion Valves
Evaporator Assembly
Water Supply Inlet
Junction Box
Hot Gas Valve
Check Valves
Cube Guides
High-Pressure
Switch
Water-Cooled
Condenser
Check Valve
(water)
Water Pump
Float Switch
Water Regulating
Valve
Compressor
Drier
Control Switch
Control Box
Liquid Line Valve
Transformer Box
Mechanical Bin Control
12
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3. KM-1301SRH-E (remote air-cooled)
Separators
Low-Side Service Valve
High-Side Service Valve
Spray Tubes
Inlet Water Valve
High-Side Liquid Service Valve
Water Supply Inlet
Evaporator Assembly
Hot Gas Valve
Junction Boxes
Cube Guides
Check Valves
High-Pressure
Switch
Expansion Valves
Receiver Tank
Check Valve
(water)
Water Pump
Float Switch
Compressor
Control Box
Access Valve
Control Switch
Drier
Liquid Line Valve
Transformer Box
Mechanical Bin Control
13
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B. Sequence of Operation
IMPORTANT
KM-1301SAH-E utilizes a thermostatic bin control. For KM-1301SAH-E
operation, the K4 jumper (4A4883G01) must be in place on the control board
RED K4 connector or the unit will not operate.
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below. When power is supplied, CB red
"POWER OK" LED and green "BC CLOSED" LED come on. If red "POWER OK" LED
is off on KM-1301SAH-E, clear ice away from the thermostatic bin control bulb in the
storage bin area. If yellow "BC OPEN" LED is on, the unit will not start. In this case
check that CB has the K4 jumper in place on CB RED K4 connector (KM-1301SAH-E)
or clear ice away from the mechanical bin control actuator paddle in the storage bin area
(KM-1301SWH-E, KM-1301SRH-E). There is a 5-second delay before startup. Note that
the order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.
a) 1-Minute Fill Cycle
LED 4 is on. WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary code
U-1 and later) energize 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 fills 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 and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary
code U-1 and later) remain energized, HGV, X1 relay (auxiliary code T-0, U-0), X10 relay
(auxiliary code U-1 and later), Comp, and FMR energize. CB monitors the warming of the
evaporator via the thermistor located on the suction line. When the thermistor reaches
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.2.b) Harvest Timer (S4 dip switch 1 & 2)."
WV is energized during harvest for a maximum of 6 minutes or the length of harvest
minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter.
CAUTION! Do not adjust S4 dip switch 7 out of the factory default position on this
model. Adjustment outside of the factory default position may result in damage to
the icemaker. For details, see "II.C.2.e) Harvest Pump Timer (S4 dip switch 7)." LED 4
goes off when WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary code
U-1 and later) de-energize. LED 3 comes on and PM energizes and runs for the last 0 or
50 seconds of harvest depending on S4 dip switch 7 setting. This circulates water over
the evaporator for the last 0 or 50 seconds of harvest. PM is energized through the #5
pin (DBu wire) on the CB K1 ten-pin connector and the X1 relay (auxiliary code T-0, U-0),
X10 relay (auxiliary code U-1 and later). When the harvest timer terminates, the harvest
cycle is complete. CB checks the position of F/S and proceeds to the freeze 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.
14
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c) Freeze Cycle
LED 1 is on. Comp and FMR remain energized, PM energizes or remains energized
depending on harvest pump timer (S4 dip switch 7) setting. FM and LLV energize.
HGV and X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later)
de-energize. For the first 5 minutes, CB will not accept a signal from F/S. This minimum
5-minute freeze time is short cycle protection for Comp. At the end of 5 minutes, F/S
assumes control. As ice builds on the evaporator, the water level in the tank lowers. The
freeze cycle continues until F/S opens and terminates the cycle. There is a 15 second
delay before CB acknowledges an open F/S.
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.
For details, see "II.C.2.c) Pump-Out Timer (S4 dip switch 3 & 4)." CAUTION! Do not
adjust S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this
model prevents the pump motor from rotating in the pump-out direction. Comp
and FMR remain energized, HGV energizes, WV energizes if S4 dip switch 3 off and 4
on. LLV and FM de-energize. 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 tube to power flush F/S. When the pump-out timer terminates, the pump-out is
complete.
The first pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter.
The pump-out frequency control is factory set, and generally no adjustment is required.
However, where water quality is bad and the icemaker needs a pump-out more often, the
pump-out frequency can be adjusted. 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. Timing of
the first pump-out is dependent on S4 dip switch 5 & 6 settings. See the table below.
S4 Dip Switch Setting
Pump-Out
Frequency
1st Pump-Out
No. 5
OFF
ON
No. 6
OFF
OFF
ON
Every cycle
Every 2 cycles
Every 5 cycles
Every 10 cycles
After 2nd freeze cycle
After 3rd freeze cycle
After 6th freeze cycle
After 11th freeze cycle
OFF
ON
ON
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
(1) Thermostatic Bin Control (KM-1301SAH-E)
When ice contacts the thermostatic BC bulb (BC open), thermostatic BC shuts down the
unit within 10 seconds. Thermostatic BC is factory set, and generally no adjustment is
required. However, adjustment may be needed in some conditions, particularly at higher
altitude locations.
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(2) Mechanical Bin Control (KM-1301SWH-E, KM-1301SRH-E)
When mechanical BC is activated (BC open), the yellow "BC OPEN" LED comes on. The
unit then shuts down as outlined in the table below.
Cycle at
Shutdown
Mechanical Bin
Control Activation
Fill Cycle
15 seconds after activation.
Harvest Cycle
At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated
at the end of the harvest cycle.
Freeze Cycle
15 seconds after activation if activated at least 15 seconds before the 5-minute short
cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.
Legend: BC–bin control; CB–control board; Comp–compressor; FM–fan motor;
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
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C. Control Board
• A Hoshizaki exclusive solid-state control board is employed in Hoshizaki Stackable
Crescent Cubers.
• All models are pretested and factory set.
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,
jumper (KM-1301SAH-E) or mechanical bin control (KM-1301SWH-E,
KM-1301SRH-E), and float switch. KM-1301SAH-E utilizes a thermostatic bin
control. For KM-1301SAH-E operation, the K4 jumper (4A4883G01) must be
in place on the control board RED K4 connector.
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
"G" Control Board
• "OUTPUT TEST" Button
(used to test relays on control board)
• Bin Control Switch
Closed LED (green)
(on continuously
in thermostatic bin
control application)
• "ALARM RESET" Button
• S4 Dip Switch
• WHITE K3 Connector
Harvest Control
(thermistor)
• Bin Control Switch
Open LED (yellow)
(mechanical bin control
application only)
• RED K4 Connector
K4 Jumper (4A4883G01)
for Thermostatic Bin
Control Application
(KM-1301SAH-E) or
Mechanical Bin Control
(KM-1301SWH-E,
• Part Number
• Alarm Buzzer
KM-1301SRH-E)
• S5 Dip Switch
• Power LED (red)
(lights when power
is supplied to the
control board)
• BLACK K5 Connector
Float Switch
• Label
• Relay LEDs
(4) (indicate
which relays are
energized as listed
below)
(control board revision
level indicated on label
on side of relay)
• K1 Ten-Pin Connector
Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve (HGV)
#3 Liquid Line Valve (LLV),
Fan Motor (FM)
• LED 2 (X2 Relay)
Hot Gas Valve (HGV)
Fan Motor (FM)
(FM off when LED on)
#4 Pump Motor (icemaking)
#5 Pump Motor (pump-out,
harvest (if applicable))
#6 Inlet Water Valve (WV)
#7, 10 Component Power
Supply
• LED 3 (X3 Relay)
Pump Motor (PM)
(on at pump-out,
harvest (if applicable))
• LED 4 (X4 Relay)
Inlet Water Valve (WV)
#8 Open
• LED 1 (X1 Relay)
Compressor (Comp),
Fan Motor-Remote
(FMR)
• K2 Connector
Transformer
"G" Control Board
Part Number 2A3792-01
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a) 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 the control switch is moved to the "ICE" position.
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 initial 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 details, see "II.B. Sequence of Operation."
Time LEDs are On
Max.
Energized
Components
Sequence Step
LED
Min.
Avg.
1-Minute Fill Cycle
Harvest Cycle
4
WV
1 minute
20 minutes 3 to 5 minutes
1, 4, 2
Comp, FMR, WV,
HGV
Comp, FMR, PM,
HGV
Comp, FM/FMR,
PM, LLV
2 minutes
0 seconds
5 minutes
Harvest Pump Timer 1, 3, 2
50 seconds harvest pump timer
setting
freeze timer 30 to 35 minutes
setting
Freeze Cycle
1
Pump-Out Cycle
1, 4*, 3, 2 Comp, FMR, WV*, 10 seconds 20 seconds *pump-out timer
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 LLV leaking by, low charge, inefficient Comp., or WRV
in a row)
Freeze Timer
Check for open thermistor, HGV not opening, TXV or
leaking by.
Check for F/S stuck closed (up), WV leaking by, HGV
(freeze > freeze timer setting for leaking by, PM not pumping, TXV not feeding properly,
two cycles in a row) LLV not opening, low charge, HM not bypassing, or
Timer is factory set using S4 dip inefficient Comp.
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)
High Voltage
Red LED turns off if voltage protection operates.
The control voltage safeties automatically reset when
voltage is corrected.
7
(147Vac 5% or more)
Legend: Comp–compressor; FM–fan motor; 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
20
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2. 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 set to the following positions:
S4 Dip Switch
S4 Dip Switch No.
KM-1301SAH-E
KM-1301SWH-E
KM-1301SRH-E
1
2
3
4
5
6
7
8
9
10
OFF OFF ON ON ON ON ON OFF ON ON
OFF OFF ON ON ON ON ON OFF ON ON
ON OFF ON ON ON ON ON OFF ON ON
S5 Dip Switch (Do Not Adjust)
1
2
3
4
5
S5 Dip Switch No.
KM-1301SAH-E
OFF OFF OFF OFF OFF
KM-1301SWH-E OFF OFF OFF OFF OFF
KM-1301SRH-E OFF OFF OFF OFF OFF
Freeze Timer (9 & 10)
Factory Use (8)
Harvest Pump Timer (7)
(Do not adjust)
Pump-Out Frequency Control (5 & 6)
Pump-Out Timer (3 & 4)
(Do not adjust to 3 off and 4 on)
Harvest Timer (1 & 2)
b) Harvest Timer (S4 dip switch 1 & 2)
The harvest timer starts when the thermistor reads 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 decreases 24-hour production.
Note that the pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer
during cycles with a pump-out. For details, see "II.C.2.c) Pump-Out Timer (S4 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)
CAUTION
Do not adjust S4 dip switch 3 off and S4 dip switch 4 on for this model.
Otherwise, pump motor does not rotate in the pump-out direction.
When a pump-out is called for, the pump motor stops after the preceding freeze cycle.
The pump motor restarts 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 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. The pump-out timer control can be set to pump-out
for 10 or 20 seconds.
Inlet
Water
S4 Dip Switch Setting Time (seconds)
T1
10
10
10
20
Valve
closed
closed
open
No. 3
OFF
ON
No. 4
OFF
OFF
ON
T2
150
180
120
180
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 10 cycles,
and generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The
pump-out frequency control can be set to have a pump-out occur every cycle, or every
2, 5, or 10 cycles.
Timing of the first pump-out is dependent on S4 dip switch 5 & 6 settings. The first
pump-out is factory set to occur after the 11th freeze cycle. See the table below.
S4 Dip Switch Setting
Pump-Out
Frequency
1st Pump-Out
No. 5
OFF
ON
No. 6
OFF
OFF
ON
Every cycle
Every 2 cycles
Every 5 cycles
Every 10 cycles
After 2nd freeze cycle
After 3rd freeze cycle
After 6th freeze cycle
After 11th freeze cycle
OFF
ON
ON
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e) Harvest Pump Timer (S4 dip switch 7)
CAUTION
Factory set for proper operation. Do not adjust. Adjustment outside of the
factory default setting may result in damage to the icemaker.
Depending on the harvest pump timer setting, the pump motor energizes and runs
the last 0 or 50 seconds of harvest. When the pump is on, water circulates over the
evaporator. The water valve is open during harvest for a maximum of 6 minutes or the
length of harvest minus 0 or 50 seconds (determined by the harvest pump timer setting),
whichever is shorter.
When S4 dip switch 7 is on, the pump motor is energized through the #5 pin (DBu wire)
on the control board K1 ten-pin connector and the X1 relay (auxiliary code T-0, U-0), X10
relay (auxiliary code U-1 and later). The #5 pin (DBu wire) is used in most applications
to reverse the pump motor or energize the drain valve in pump-out cycles. In this
application, it is used for the pump-out cycle (reverse rotation) as well as the harvest
pump timer (freeze rotation). Therefore, the harvest pump timer relays are needed to
control the pump motor direction during the pump-out and harvest cycles. See "III.B.
Wiring Diagrams."
S4 Dip Switch Setting
Pump Motor
Time (seconds)
No. 7
ON
50
0
OFF
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 freeze timer terminations, the control board shuts down
the icemaker. In this case, see "IV.G.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.
Time
S4 Dip Switch Setting
(minutes)
No. 9
OFF
OFF
ON
No. 10
OFF
ON
60
50
70
60
OFF
ON
ON
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h) Float Switch Control (S5 dip switch 1)
CAUTION
Do not adjust. This must be left in the factory default position or the unit will not
operate correctly.
Factory set. S5 dip switch 1 allows for single or double float switch applications. The
KM-1301SAH-E, KM1301SWH-E, and KM-1301SRH-E use a single float switch.
i) Refill Counter (S5 dip switch 2 through 5)
CAUTION
Do not adjust. These must be left in the factory default position or the unit will
not operate correctly.
Factory set. S5 dip switch 2 through 5 allows for refills during the freeze cycle.
The KM-1301SAH-E, KM1301SWH-E, and KM-1301SRH-E do not refill.
D. 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.
24
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III.Technical Information
A. Water Circuit and Refrigeration Circuit
1. KM-1301SAH-E (air-cooled)
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2. KM-1301SWH-E (water-cooled)
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3. KM-1301SRH-E (remote air-cooled)
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B. Wiring Diagrams
1. Auxiliary Code T-0, U-0
a) KM-1301SAH-E (air-cooled)
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2. Auxiliary Code U-1 and Later
a) KM-1301SAH-E (air-cooled)
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b) KM-1301SWH-E (water-cooled)
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c) KM-1301SRH-E (remote air-cooled)
31
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C. Performance Data
1. KM-1301SAH-E (air-cooled)
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
PRODUCTION PER 24 HR.
(ºF/ºC)
70/21
80/27
50/10
90/32
1114
505
494
1082
1039
491
471
992
924
450
419
1089
90/32
100/38
70/21
80/27
90/32
1082
1048
491
475
1004
455
444
897
799
407
362
lbs./day kg./day
979
APPROXIMATE ELECTRIC
CONSUMPTION
1900
1949
1964
1958
1964
2049
2120
2127
2009
2069
2151
2180
watts
100/38
70/21
80/27
90/32
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
537
452
426
302
2.03
1.71
1.61
1.14
426
279
157
153
1.61
1.06
0.59
0.58
377
288
140
125
1.43
1.09
0.53
0.47
gal./day m3/day
100/38
70/21
80/27
90/32
100/38
70/21
FREEZING CYCLE TIME
34
35
35
37
4.8
35
38
40
41
4.0
39
43
44
48
3.7
min.
HARVEST CYCLE TIME
80/27
90/32
100/38
4.2
4.0
3.1
2.9
2.1
2.1
3.2
2.1
2.1
min.
HEAD PRESSURE
70/21
80/27
90/32
275
289
293
19.3
20.3
20.6
293
318
338
20.6
22.3
23.8
316
338
360
22.2
23.8
25.3
PSIG kg/cm2G
100/38
297
20.9
343
24.1
380
26.7
SUCTION PRESSURE
70/21
80/27
90/32
57
58
58
4.0
4.1
4.1
58
59
60
4.1
4.2
4.2
61
64
64
4.3
4.5
4.5
PSIG kg/cm2G
100/38
59
4.2
61
4.3
68
4.8
TOTAL HEAT OF REJECTION FROM CONDENSER
19,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
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.
32
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2. KM-1301SWH-E (water-cooled)
APPROXIMATE ICE
PRODUCTION PER 24 HR.
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
50/10
90/32
1330
603
594
1304
1269
591
576
1239
1189
562
539
1310
90/32
100/38
70/21
80/27
90/32
1304
1281
591
581
1240
562
554
1165
1096
528
497
lbs./day kg./day
1222
APPROXIMATE ELECTRIC
CONSUMPTION
1780
1780
1780
1790
1780
1780
1780
1786
1799
1810
1806
1830
watts
100/38
70/21
80/27
90/32
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
1335
1404
1425
1741
5.05
5.31
5.40
6.59
1425
1544
1643
1805
5.40
5.85
6.22
6.83
1971
2324
2335
2971
7.46
8.80
8.84
gal./day m3/day
100/38
70/21
80/27
90/32
100/38
70/21
11.25
FREEZING CYCLE TIME
31
32
32
33
4.2
32
33
34
34
3.7
34
35
36
38
3.4
min.
HARVEST CYCLE TIME
80/27
90/32
100/38
3.8
3.7
3.1
3.0
2.4
2.4
2.9
2.2
2.1
min.
HEAD PRESSURE
70/21
80/27
90/32
238
239
239
16.7
16.8
16.8
239
240
241
16.8
16.9
16.9
249
256
255
17.5
18.0
17.9
PSIG kg/cm2G
100/38
244
17.2
244
17.2
267
18.8
SUCTION PRESSURE
70/21
80/27
90/32
50
50
51
3.5
3.5
3.6
51
51
52
3.6
3.6
3.7
52
52
53
3.6
3.7
3.7
PSIG kg/cm2G
100/38
51
3.6
52
3.7
54
3.8
TOTAL HEAT OF REJECTION FROM CONDENSER
19,382 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
2,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
117 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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3. KM-1301SRH-E (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
1270
1241
1233
1211
576
563
559
549
1233
1183
1142
1123
559
537
518
509
1160
1100
1062
988
526
499
482
448
lbs./day kg./day
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
APPROXIMATE ELECTRIC
CONSUMPTION
1950
1977
1985
1992
1985
2031
2070
2080
2028
2071
2112
2150
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
544
473
451
342
2.06
1.79
1.71
1.30
451
330
228
220
1.71
1.25
0.86
0.83
396
314
194
163
1.50
1.19
0.74
0.62
gal./day m3/day
FREEZING CYCLE TIME
33
34
34
35
4.7
34
36
37
38
4.1
36
38
40
42
3.8
min.
HARVEST CYCLE TIME
80/27
90/32
100/38
4.2
4.1
3.4
3.3
2.6
2.6
3.2
2.4
2.3
min.
HEAD PRESSURE
70/21
80/27
90/32
210
221
225
14.8
15.6
15.8
225
244
260
15.8
17.2
18.3
238
254
271
16.7
17.8
19.1
PSIG kg/cm2G
100/38
225
15.8
263
18.5
282
19.8
SUCTION PRESSURE
70/21
80/27
90/32
50
51
51
3.5
3.6
3.6
51
52
53
3.6
3.7
3.7
55
57
58
3.8
4.0
4.1
PSIG kg/cm2G
100/38
53
3.7
54
3.8
62
4.4
TOTAL HEAT OF REJECTION FROM CONDENSER
18,982 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
2,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
133 CU. IN (URC-14FE)
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.
34
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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. Check CB using the steps in "IV.B. Control Board Check." Check the dip switch
settings to assure that S4 dip switch 3, 4, 7, 8, 9, & 10 and S5 dip switch 1 through 5 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.2.a) Default Dip Switch
Settings." As you go through the procedure, check to assure the components energize
and de-energize correctly. If not, those components and controls are suspect.
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. CB red "POWER OK" LED and green "BC CLOSED" LED come on.
If red "POWER OK" LED is off on thermostatic BC unit (KM-1301SAH-E), clear ice
away from the thermostatic bin control bulb in the storage bin area. If no ice is near
the thermostatic bin control bulb or the LED does not come on even after clearing
away ice, check thermostatic BC. See "IV.C.1. Thermostatic Bin Control Check." If
yellow "BC OPEN" LED is on (indicating a full bin), confirm that CB K4 jumper is in
place on thermostatic BC unit (KM-1301SAH-E) or check BC on mechanical BC unit
(KM-1301SWH-E, KM-1301SRH-E). See "IV.C.2.a) Mechanical Bin Control Check."
3) 1-Minute Fill Cycle – LED 4 is on. WV and X2 relay (auxiliary code T-0, U-0), X11 relay
(auxiliary code U-1 and later) energize 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 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 the supply voltage at WV terminals, check continuity on the coil, confirm
the screen or external filter isn't 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 and X2 relay (auxiliary code
T-0, U-0), X11 relay (auxiliary code U-1 and later) remain energized, HGV, X1 relay
(auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later), Comp, and FMR
energize. CB monitors the warming of the evaporator via the thermistor located on the
suction line. When the thermistor reaches 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.2.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 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
minus 0 or 50 seconds (harvest pump timer (S4 dip switch 7)), whichever is shorter.
LED 4 goes off when WV and X2 relay (auxiliary code T-0, U-0), X11 relay (auxiliary
code U-1 and later) de-energize. LED 3 comes on and PM energizes and runs for the
last 0 or 50 seconds of harvest depending on S4 dip switch 7 setting. CAUTION! Do
not adjust S4 dip switch 7 out of the factory default position on this model.
Adjustment outside of the factory default position may result in damage to the
icemaker. For details, see "II.C.2.e) Harvest Pump Timer (S4 dip switch 7)."
PM is energized through the #5 pin (DBu wire) on the CB K1 ten-pin connector and
the X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code U-1 and later). 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 cycle if it is
open. The minimum total time allowed by CB for a complete harvest cycle is 2 minutes.
Diagnosis: Check if Comp is running, HGV and WV still energized. 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 Comp discharge line. Is it hot? If not, check refrigerant
pressures and Comp operation. If it is hot, touch the inlet line to the evaporator. Is it
hot? If it is hot and the freeze cycle is not starting, check the harvest timer adjustment
(S4 dip switch 1 & 2), the thermistor for open circuit, the discharge line temperature,
Comp efficiency, and if HGV is fully open. For a thermistor check, see "IV.E. Thermistor
Check." Check that PM circulates water over evaporator for the last 50 seconds of
harvest. If not, check X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary code
U-1 and later) and S4 dip switch 3 & 4. If 1-minute fill cycle starts, see "IV.D. Float
Switch Check and Cleaning."
5) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM energizes
or remains energized depending on harvest pump timer (S4 dip switch 7) setting.
FM and LLV energize. HGV and X1 relay (auxiliary code T-0, U-0), X10 relay (auxiliary
code U-1 and later) 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. During
the first 5 minutes of freeze, confirm that the evaporator temperature drops. After
5 minutes in freeze, disconnect black F/S connector from CB BLACK K5 connector.
After a 15 second delay, the unit should switch out of the freeze cycle. Diagnosis: If
the evaporator is not cold, check to see if HGV is still open or if TXV is not opening
properly, if WV is continuing to fill the reservoir, if there are improper unit pressures,
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an inoperative Comp, or an inoperative HM. If the unit switches out of freeze with F/S
connector 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 longer than 15 seconds
after disconnecting black F/S connector, replace CB.
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and
conditions. Cycle times and pressures should follow performance data provided in
this manual. See "III.C. Performance Data."
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. CAUTION! Do not adjust
S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this model
prevents the pump motor from rotating in the pump-out direction. For details, see
"II.C.2.c) Pump-Out Timer (S4 dip switch 3 & 4)." Comp and FMR remain energized,
HGV energizes. WV energizes if S4 dip switch 3 off and 4 on. LLV and FM de-energize.
PM stops for 2 seconds, then reverses for 10/20 seconds depending on pump-out
timer S4 dip switch 3 & 4 setting. When the pump-out timer terminates, the pump-
out is complete. The pump-out frequency control is factory set for every 10th cycle,
and generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump-out frequency can be adjusted.
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.Timing of the first pump-out is dependent
on S4 dip switch 5 & 6 settings. See the table below.
S4 Dip Switch Setting
Pump-Out
Frequency
1st Pump-Out
No. 5
OFF
ON
No. 6
OFF
OFF
ON
Every cycle
Every 2 cycles
Every 5 cycles
Every 10 cycles
After 2nd freeze cycle
After 3rd freeze cycle
After 6th freeze cycle
After 11th freeze cycle
OFF
ON
ON
Diagnosis: If PM does not reverse, check to see if CB S4 and S5 dip switch settings
are in the factory default position. If S4 dip switch 3 and 4 are adjusted to 3 off and 4 on,
WV and harvest pump timer relays energize. Once these relays energize, the pump
motor rotates in the freeze cycle rotation. See "III.B. Wiring Diagrams." Check PM circuit
and capacitor, check #5 pin (DBu wire) on CB K1 ten-pin connector for voltage, harvest
pump timer X1 and X2 relays (auxiliary code T-0, U-0), X10 and X11 relays (auxiliary
code U-1 and later). If water does not pump out, check and clean the check valve
assembly and tubing.
7) Normal Harvest Cycle – same as the initial harvest cycle – Return to "IV.A.4) Initial
Harvest Cycle."
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8) Shutdown
a) Thermostatic Bin Control: KM-1301SAH-E
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 (CB
red "POWER OK" LED is off). 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. Diagnosis: See "IV.C.1.
Thermostatic Bin Control Check."
b) Mechanical Bin Control: KM-1301SWH-E, KM-1301SRH-E
See "IV.C.2.a) Mechanical Bin Control Check."
Legend: BC–bin control; CB–control board; Comp–compressor; FM–fan motor; 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
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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 while the control board is beeping. WARNING! Risk
of electric shock. Care should be taken not to touch live terminals.
Once reset, the unit starts at the 1-minute fill cycle. For audible alarm
information, see "II.C.1.a) LED Lights and Audible Alarm Safeties."
1) Check the dip switch settings to assure that S4 dip switch #3, 4, 7, 8, 9, & 10 and
S5 dip switch 1 through 5 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.2.a) Default Dip Switch Settings."
2) Move the control switch to the "ICE" position. If the red "POWER OK" LED is on, the
control voltage is good. If the red "POWER OK" LED is off on a thermostatic bin control
unit (KM-1301SAH-E), clear ice away from the thermostatic bin control bulb in the
storage bin area. If no ice is near the thermostatic bin control bulb or the red "POWER
OK" LED does not come on even after clearing away ice, check the thermostatic bin
control. See "IV.C.1. Thermostatic Bin Control Check." If the thermostatic bin control is
okay (closed) or you are diagnosing a mechanical bin control unit and the red "POWER
OK" LED is off, check the fuse, control switch contacts, high-pressure switch, and
control transformer secondary circuit. 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.
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.G.1. No Ice Production."
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 1, 4, 3, 2. Note that the order of the LEDs from the outer edge
of the control board is 1, 4, 3, 2. Components (e.g., compressor) will 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.
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.
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C. Bin Control Check
1.Thermostatic Bin Control Check: KM-1301SAH-E
To check the thermostatic bin control, follow the steps below.
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 is factory set, and generally no adjustment is required.
However, adjustment may be needed in some conditions, particularly at higher altitude
locations. Note that when the thermostatic bin control switch is open, the control board
red "POWER OK" LED is off.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Clear any ice away from the thermostatic bin control bulb.
4) Remove the control box cover, then disconnect the thermostatic bin control wires from
the thermostatic bin control switch.
5) Hold your hand around the thermostatic bulb to warm it up.
6) Check for continuity across the thermostatic bin control switch. If closed, continue to
step 6. If open, adjust or replace the thermostatic bin control.
7) With the multimeter test leads still in place, hold ice on the thermostatic bin control 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.
2. Mechanical Bin Control Check and Cleaning: KM-1301SWH-E, KM-1301SRH-E
a) Mechanical Bin Control Check
To check the mechanical bin control switch, 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, then clear any ice away from the mechanical bin control.
4) Check bin control cable and wire harness connections. See Fig. 1.
5) Disconnect the red connector from the control board RED K4 connector.
6) Check for continuity across the wires of the red connector. When the actuator paddle
is not engaged, the mechanical bin control switch is closed. If open, check that bin
control cable connector and the wire harness connector(s) are properly connected and
that the actuator paddle is not sticking. Clean if necessary. See "IV.C.2.b) Mechanical
Bin Control Cleaning." If the mechanical bin control switch still reads open, replace the
mechanical bin control.
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7) Press the actuator paddle, check for continuity across the wires of the red connector.
When the actuator paddle is engaged, the mechanical bin control switch is open.
If closed, check that the actuator paddle is not restricted. Clean if necessary. See
"IV.C.2.b) Mechanical Bin Control Cleaning." If the mechanical bin control switch still
reads closed, replace the mechanical bin control.
8) Reconnect the red connector to the control board RED K4 connector, then move the
control switch to the "ICE" position. Turn on the power supply.
9) Check that the green "BC CLOSED" LED on the control board is on.
10) Allow the unit to cycle on. Press and hold the actuator paddle. The yellow "BC OPEN"
LED should be on and the unit should shut down according to the chart below. If it does
not, replace the control board.
Cycle at
Shutdown
Mechanical Bin
Control Activation
Fill Cycle
15 seconds after activation.
Harvest Cycle
At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated
at the end of the harvest cycle.
Freeze Cycle
15 seconds after activation if activated at least 15 seconds before the 5-minute short
cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.
Single Unit Connection Detail
Stacked Unit Connection Detail
Upper Unit Wire Harness
Connector B (not used)
Wire Harness Connector B
(for upper unit)
Wire
Harness
Connector A
Upper
Bin Control
Cable Connector
Unit Wire
Harness
Connector A
Lower Unit Wire Harness
Connector B
Control Board
Red K4
Connector
Actuator Paddle
Control Board
Red K4
Connector
Actuator Paddle
Fig. 1
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b) Mechanical Bin Control Cleaning
Scale may build up on the mechanical bin control. Scale can cause the actuator paddle
and magnet to stick. In this case, the mechanical bin control should be cleaned.
WARNING
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.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Clear any ice away from the mechanical bin control.
4) Disconnect the bin control cable connector, then remove the mechanical bin control
assembly from the unit.
5) Remove the actuator paddle from the switch mount. See Fig. 2.
6) Wipe down the mechanical bin control assembly with a mixture of 1 part Hoshizaki
"Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean water.
7) Reassemble the mechanical bin control assembly and replace it in its correct position.
Note: If the magnet was removed for cleaning, be sure to replace it in its correct
position.
8) Reconnect the bin control cable connector.
9) Move the control switch to the "ICE" position.
10) Replace the front panel in its correct position.
11) Turn on the power supply to start the automatic icemaking process.
Bin Control Cable Connector
Bin Control Bracket
Fig. 2
Actuator Paddle
Magnet
Switch Mount
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D. Float Switch Check and Cleaning
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.
1. Float Switch Check
To check the float switch, 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 insulation panel, then remove
the drain plug located on the lower front
part of the ice chute. See Fig. 3. Allow the
water tank to drain.
4) Replace the drain plug in its correct
position. Be careful not to cross thread it.
5) Remove the control box cover.
6) Disconnect the black float switch
Ice Chute
Drain Plug
Float Switch Assembly
connector from the control board BLACK
K5 connector.
Fig. 3
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.
8) Reconnect the black float switch connector to the control board BLACK K5 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, then move the control switch to the "OFF" position.
12) Remove the control box cover.
13) Disconnect the black float switch connector from the control board BLACK K5 connector.
14) 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 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.
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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, then move the control switch to the "OFF" position.
3) Remove the insulation panel, then remove the drain plug located on the lower front part
of the ice chute. See Fig. 3. Allow the water tank to drain.
4) Replace the drain plug in its correct position. Be careful not to cross thread it.
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 boot from
the bottom of the float switch assembly. See Fig. 4.
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.
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 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.
11) Turn on the power supply to start the automatic icemaking process.
Vent
Flush
Shaft
Fig. 4
Float Switch
Housing
Float
Retainer Rod
Rubber Boot
and Hose
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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.
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or
3 minutes.
6) Disconnect 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. See "V.B. Important Notes
for Component Replacement." If inside the normal reading, continue to the next step.
7) Replace the thermistor in its correct position. See "V.B. Important Notes for Component
Replacement."
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 terminate and end the harvest cycle within 2 to 3 minutes. If
the harvest timer does not terminate and end the harvest cycle, the harvest timer is bad
and the control board should be replaced.
F. Adjustment of Water Regulating Valve (water-cooled model)
The water regulating valve (also called "water regulator") is factory set, and generally no
adjustment is required. However, when necessary, adjust the water regulator 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.
2) Five minutes after a freeze cycle starts,
Adjustment Screw
confirm that the thermometer reads 104°F
to 115°F (40°C to 46°C). If it does not,
use a flat blade screwdriver to rotate the
adjustment screw on the water-regulating
CCW – Higher
CW – Lower
valve until the temperature is in the proper
Top View
range (rotate counterclockwise to raise
the temperature or clockwise to lower the
temperature). See Fig. 5. Next, check that
Fig. 5
the reference pressure is in the range
indicated in the Head Pressure table in the
Performance Data section. If it is not in the
proper range, verify the refrigerant charge.
3) Check that the condenser drain temperature is stable.
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G. Diagnostic Charts
Before consulting the diagnostic charts, check for correct installation, proper voltage per unit
nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board
Check." Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, & 10 and
S5 dip switch 1 through 5 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.3.a)
Default Dip Switch Settings."
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
2. Main Transformer (230V/115V)
3. Water Supply
a) Coil winding open or shorted.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) Tripped with bin filled with ice.
b) Ambient temperature too cool.
c) Set too warm.
4. Thermostatic Bin Control.
See "IV.C.1. Thermostatic Bin
Control Check."
d) Bulb out of position.
e) Bad contacts.
5. Fuse (Control Box)
6. Control Switch
a) Blown.
a) Bad contacts.
7. High-Pressure Switch
a) Bad contacts.
b) Dirty air filter or condenser.
c) Ambient or condenser water temperature too warm.
d) Refrigerant overcharged.
e) Fan not operating (air-cooled and remote air-cooled models).
f) Refrigerant lines or components plugged.
g) Condenser water pressure too low or off (water-cooled model).
h) Headmaster (C.P.R.) open (remote condenser unit).
a) Coil winding open or shorted.
8. Control Transformer
(115V/10.5V)
9. Control Board
a) In alarm.
See "IV.B. Control Board Check."
b) Defective.
10. Mechanical Bin Control
See "IV.C.2. Mechanical Bin
Control Check and Cleaning."
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) Defective.
11. Thermistor
a) Leads shorted or open.
See "IV.E. Thermistor Check."
12. Hot Gas Valve
a) Open in freeze cycle.
b) Closed in harvest cycle.
a) Mesh filter or orifice clogged.
b) Coil winding open.
13. Inlet Water Valve
c) Open in freeze cycle.
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No Ice Production - Possible Cause
14. Float Switch
a) Float does not move freely.
b) Defective.
See "IV.D. Float Switch Check
and Cleaning."
15. Compressor
a) Compressor relay/magnetic contactor contacts bad or coil winding
open.
b) Start capacitor or run capacitor defective.
c) Internal overload protector open.
d) Starter contacts bad or coil winding open.
e) Protector tripped.
f) Compressor defective.
16. Pump Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
d) Mechanical seal worn out.
a) Leaking by.
17. Pump-Out Check Valve
18. Water System
a) Water leaks causing short freeze time.
a) Motor winding open.
19. Fan Motor
b) Bearing worn out or locked rotor.
c) Defective capacitor.
20. Liquid Line Valve (if applicable) a) Closed in freeze cycle.
b) Open in harvest cycle.
21. Expansion Valve (TXV)
a) Bulb loose.
b) Operating erratically.
22. Headmaster (C.P.R.) (remote
condenser unit)
a) Open out of temperature/pressure range.
23. Water Regulating Valve
(water-cooled model)
a) Insufficient water supply.
b) Out of adjustment.
See "IV.F. Adjustment of Water
Regulating Valve."
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2. Freeze Up
Defrost and clean the unit prior to diagnosing freeze up. See "VI.A. Cleaning and Sanitizing
Instructions."
Freeze Up - Possible Cause
Harvest Cycle
1. Evaporator
a) Scaled up.
b) Damaged.
2. Separators
3. Cube Guide
a) Out of position.
a) Out of position.
a) Dirty.
4. Spray Tubes and/or Spray
Guides
b) Out of position.
a) Low.
5. Refrigerant Charge
6. Ambient Temperature
7. Water Supply
a) Too cool.
a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID (10 mm nominal OD)
8. Thermostatic Bin Control
See "IV.C.1. Thermostatic Bin
Control Check."
a) Extension bracket not installed.
b) Bulb out of position.
c) Bad contacts.
9. Control Board
a) Harvest timer set too short.
b) Defective.
See "IV.B. Control Board Check."
10. Mechanical Bin Control
See "IV.C.2. Mechanical Bin
Control Check and Cleaning."
a) Actuator does not move freely.
11. Thermistor
a) Loose, disconnected, or defective.
See "IV.E. Thermistor Check."
12. Hot Gas Valve
a) Closed.
13. Inlet Water Valve
a) Water valve screen clogged.
14. Liquid Line Valve (if applicable) a) Open.
15. Expansion Valve (TXV)
a) Defective.
16. Water Regulating Valve
(water-cooled model)
a) Leaking by.
b) Defective.
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Freeze Up - Possible Cause
1. Evaporator
Freeze Cycle
a) Scaled up.
b) Damaged.
2. Separators
a) Out of position.
a) Dirty.
3. Spray Tubes and/or Spray
Guides
b) Out of position.
a) Low.
4. Refrigerant charge.
5. Check Valve
a) Defective.
6. Control Board
a) Freeze timer set incorrectly.
b) Defective.
See "IV.B. Control Board Check."
7. Inlet Water Valve
a) Leaking by.
8. Float Switch
a) Float does not move freely.
b) Defective.
See "IV.D. Float Switch Check
and Cleaning."
9. Pump Motor
a) RPM too slow.
a) Defective.
10. Expansion Valve (TXV)
11. Headmaster (C.P.R.) (remote
condenser unit)
a) Defective.
12. Water Regulating Valve
(water-cooled model)
a) Out of adjustment.
See "IV.F. Adjustment of Water
Regulating Valve."
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3. Low Ice Production
Low Ice Production - Possible Cause
Long Harvest Cycle
a) Scaled up.
a) Dirty.
1. Evaporator
2. Spray Tubes and/or Spray
Guides
b) Out of position.
3. Refrigerant Charge
4. Water Supply
a) Low.
a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID (10 mm nominal OD)
d) Too cold.
5. Control Board
a) Thermistor connection loose (K3).
b) Defective.
See "IV.B. Control Board Check."
6. Thermistor
a) Loose, disconnected, or defective.
See "IV.E. Thermistor Check."
7. Hot Gas Valve
8. Inlet Water Valve
9. Compressor
a) Erratic or closed.
a) Water valve screen clogged.
a) Inefficient or off.
10. Liquid Line Valve (if applicable) a) Erratic or open.
11. Expansion Valve (TXV)
a) Defective.
12. Water Regulating Valve
(water-cooled model)
a) Leaking by.
Long Freeze Cycle
1. Evaporator
a) Scaled up.
a) Low.
2. Refrigerant Charge
3. Air Filter (air-cooled model)
a) Clogged.
a) Clogged.
4. Condenser (air-cooled and
remote air-cooled models)
5. Condenser (water-cooled model) a) Water temperature out of specification.
6. Control Board
a) Float switch connection loose (K5).
b) Defective.
See "IV.B. Control Board Check."
7. Hot Gas Valve
a) Erratic or open.
8. Inlet Water Valve
a) Leaking by.
9. Float Switch
a) Float does not move freely or defective switch.
See "IV.D. Float Switch Check
and Cleaning."
10. Compressor
11. Pump Motor
a) Inefficient or off.
a) RPM too slow.
12. Liquid Line Valve (if applicable) a) Erratic or closed.
13. Expansion Valve (TXV)
a) Bulb loose.
b) Defective.
14. Headmaster (C.P.R.) (remote
condenser unit)
a) Not bypassing.
15. Water Regulating Valve
(water-cooled model)
a) Out of adjustment.
See "IV.F. Adjustment of Water
Regulating Valve."
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V. 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. Lockout/Tagout to prevent the power from being turned back
on inadvertently.
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. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts. 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).
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 air-cooled and water-cooled models, 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 high and low-side service valves. Close the high and low-side gauge manifold
valves, then disconnect the gauge manifold hoses.
10) Cap the service valves to prevent a possible leak.
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B. Important Notes for Component Replacement
CAUTION
When replacing a component listed below, see the notes to help ensure proper
operation.
Component
Notes
Compressor
Install a new start capacitor, run capacitor, and start relay.
Expansion Valve • Attach the expansion valve bulb to the suction line in the same location as the previous
bulb.
• The bulb should be between the 10 and 2 o'clock position on the tube.
• Secure the bulb with the clamp and holder, then insulate it.
Hot Gas Valve
• Replace the strainer when replacing the hot gas valve.
Liquid Line Valve
• Use copper tube of the same diameter and length when replacing valve lines.
Install a new capacitor.
Fan Motor
Pump Motor
Thermistor
Install a new capacitor.
• Attach the new thermistor to the suction line in the same location as the previous
thermistor.
• The thermistor should be at the 12 o'clock position on the tube.
• Smoothly fill the recessed area of the thermistor holder with high thermal conductive
type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound
10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu
Silicones), or equivalent are recommended.
• Secure the thermistor with the holder, then insulate it.
• Be very careful to prevent damage to the leads.
Thermistor Holder
Thermistor Lead
Foam Insulation
Cable Tie
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VI. Cleaning and Maintenance
This icemaker must be cleaned and maintained in accordance with the documentation
and labels provided with the icemaker. Consult with your local distributor about cleaning
and maintenance service. To obtain the name and phone number of your local distributor,
contact your nearest Hoshizaki Service office (listed in the Instruction Manual and at
www.hoshizaki.com).
WARNING
1. Except as specified below, only qualified service technicians should attempt
to service this icemaker.
2.CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews
are securely in place after any cleaning or maintenance is done to the unit.
Make sure that none have fallen into the storage bin.
3. This appliance must not be cleaned by use of a water jet.
4. To prevent possible damage, do not clean the plastic parts with water above
104°F (40°C) or in a dishwasher.
5. The storage bin is for ice use only. Do not store anything else in the storage
bin.
A. Cleaning and Sanitizing Instructions
Performed by Qualified Service Technician
Hoshizaki recommends cleaning and sanitizing this unit at least once a year. More
frequent cleaning and sanitizing, however, may be required in some existing water
conditions.
WARNING
1. To prevent injury to individuals and damage to the icemaker, do not use
ammonia type cleaners.
2.Carefully follow any instructions provided with the bottles of cleaning and
sanitizing solution.
3. Always wear liquid-proof gloves and goggles to prevent the cleaning and
sanitizing solutions from coming into contact with skin or eyes.
4. 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.
1. Cleaning Procedure
1) Dilute 27 fl. oz. (800 ml) of Hoshizaki "Scale Away" with 5 gal. (19 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, then remove the insulation panel by first removing the
thumbscrew, lifting up the panel slightly and pulling it towards you.
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5) Remove the drain plug located on the lower front part of the ice chute. See Fig. 6. Allow
the water tank to drain.
6) Replace the drain plug in its correct position. Be careful not to cross thread it.
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. Remove the rubber boot from the bottom of the
assembly.
b. Remove the retainer rod from the bottom of the float switch housing, 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) Move the control switch on the control box to the "WASH" position.
10) Replace the insulation panel and the front panel in their correct positions.
11) Turn on the power supply to start the washing process.
12) Turn off the power supply after 30 minutes.
13) Remove the front panel and the insulation panel.
14) Remove the drain plug. Allow the water tank to drain. Replace the drain plug and the
insulation panel in their correct positions.
Ice Chute
Drain Plug
Float Switch Assembly
Fig. 6
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15) Move the control switch to the "ICE" position.
16) Replace the front panel in its correct position.
17) Turn on the power supply to fill the water tank with water.
18) Turn off the power supply after 3 minutes.
19) Remove the front panel.
20) Move the control switch to the "WASH" position.
21) Replace the front panel in its correct position.
22) Turn on the power supply to rinse off the cleaning solution.
23) Turn off the power supply after 5 minutes.
24) Remove the front panel and the insulation panel.
25) Remove the drain plug. Allow the water tank to drain. Replace the drain plug and the
insulation panel in their correct positions.
Note: Do not replace the insulation panel when you proceed to "2. Sanitizing
Procedure."
26) Repeat steps 15 through 25 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 2.5 fl. oz. (74 ml or 5 tbs) of a 5.25% sodium hypochlorite solution (chlorine
bleach) with 5 gal. (19 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 the control switch is in the "WASH" position.
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 drain plug. Allow the water tank to drain. Replace the drain plug and the
insulation panel in their correct positions.
8) Repeat steps 15 through 25 in "1. Cleaning Procedure" two times to rinse thoroughly.
9) Move the control switch to the "ICE" position.
10) Replace the front panel in its correct position.
11) Clean the storage bin liner using a neutral cleaner. Rinse thoroughly after cleaning.
12) Turn on the power supply to start the automatic icemaking process.
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B. Maintenance
The maintenance schedule below is a guideline. More frequent maintenance may be
required depending on water quality, the icemaker's environment, and local sanitation
regulations.
WARNING
1. Except as specified below, only qualified service technicians should attempt
to service this icemaker.
2. Move the power switch to the "OFF" position and disconnect power before
servicing.
1. Stainless Steel Exterior - Performed by Qualified Service Technician or Owner/
Manager
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 buildup.
2. Storage Bin and Scoop - Performed by Qualified Service Technician or Owner/
Manager
Clean the scoop and the storage bin liner using a neutral cleaner. Rinse thoroughly after
cleaning.
3. Air Filters (air-cooled model) - Performed by Qualified Service Technician or Owner/
Manager
Plastic mesh air filters remove dirt and dust from the air and keep the condenser from
getting clogged. As the filters get clogged, the icemaker’s performance will be reduced.
Check the filters at least twice a month. When clogged, use warm water and a neutral
cleaner to wash the filters.
4. Condenser (air-cooled and remote air-cooled models) - Performed by Qualified
Service Technician
The condenser should be checked and cleaned once a year. Instructions for the service
technician can be found in the Installation Manual supplied with this icemaker.
C. Preparing the Icemaker for Long Storage
Performed by Qualified Service Technician
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 under normal conditions, it is sufficient
to move the control switch to the "OFF" position. When storing the icemaker for an extended
time or in sub-freezing temperatures, follow the instructions below.
1. Remove the water from the icemaker water supply line:
1) Turn off the power supply, then remove the front panel.
2) Move the control switch on the control box to the "OFF" position.
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3) Close the icemaker water supply line shut-off valve, then open the icemaker water
supply line drain valve.
4) Allow the line to drain by gravity.
5) Attach a compressed air or carbon dioxide supply to the icemaker water supply line
drain valve.
6) Move the control switch to the "ICE" position.
7) Replace the front panel in its correct position, then turn on the power supply.
8) Blow the icemaker water supply line out using the compressed air or carbon dioxide
supply.
9) Close the icemaker water supply line drain valve.
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 drain plug located on the lower front part of
the ice chute. See Fig. 5. Allow the water tank to drain.
3) Replace the drain plug and the insulation panel in their correct positions. Be careful not
to cross thread the drain plug.
4) Remove all ice from the storage bin. Clean the storage bin using a neutral cleaner.
Rinse thoroughly after cleaning.
5) Replace the front panel in its correct position.
3. On water-cooled model, 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
system, also close the condenser return line shut-off valve.
3) Open the condenser water supply line drain valve. If connected to a closed loop system,
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).
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