Reliability is a
beautiful thing
TM
MODULAR CRESCENT CUBER
KMD-700MAH
KMD-700MWH
KMD-700MRH
KMD-900MAH
KMD-900MWH
KMD-900MRH
SERVICE MANUAL
ITEM #: 73107
™
ISSUED: June 2, 2003
REVISED: July 28, 2006
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Please review this manual. It should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians should
service and maintain the icemaker. This manual should be made available to the
technician prior to service or maintenance.
CONTENTS
I. Specifications .................................................................................................................... 5
1. KMD-700MAH .............................................................................................................. 5
2. KMD-700MWH ............................................................................................................. 6
3. KMD-700MRH .............................................................................................................. 7
4. KMD-900MAH .............................................................................................................. 8
5. KMD-900MWH ............................................................................................................. 9
6. KMD-900MRH ............................................................................................................ 10
7. Condensing Unit......................................................................................................... 11
URC-12F.................................................................................................................. 11
II. General Information ........................................................................................................ 13
1. Construction ............................................................................................................... 13
[a] KMD-700MAH ..................................................................................................... 13
[b] KMD-700MWH .................................................................................................... 14
[c] KMD-700MRH ..................................................................................................... 15
[d] KMD-900MAH ..................................................................................................... 16
[e] KMD-900MWH .................................................................................................... 17
[f] KMD-900MRH ...................................................................................................... 18
2. Controller Board ......................................................................................................... 19
[a] Solid-State Control .............................................................................................. 19
[b] Controller Board .................................................................................................. 19
[c] Sequence ............................................................................................................ 23
[d] Controls and Adjustments ................................................................................... 26
[e] Checking the Controller Board ............................................................................ 30
3. Mechanical Bin Control .............................................................................................. 31
[a] Proximity Switch .................................................................................................. 31
[b] Explanation of Operation ..................................................................................... 31
[c] Troubleshooting ................................................................................................... 32
III.Technical Information ..................................................................................................... 33
1.Water Circuit and Refrigerant Circuit........................................................................... 33
[a] KMD-700MAH and KMD-900MAH ...................................................................... 33
[b] KMD-700MWH and KMD-900MWH .................................................................... 34
[c] KMD-700MRH and KMD-900MRH...................................................................... 35
2. Wiring Diagrams ......................................................................................................... 36
[a1] KMD-700MAH and KMD-700MWH (auxiliary code R-0 and earlier) ................. 36
[a2] KMD-700MAH and KMD-700MWH (auxiliary code R-1 and later) .................... 37
[b1] KMD-700MRH (auxiliary code R-0 and earlier) ................................................ 38
[b2] KMD-700MRH (auxiliary code R-1 and later) .................................................... 39
[c1] KMD-900MAH and KMD-900MWH (auxiliary code R-0 and earlier) ................. 40
[c2] KMD-900MAH and KMD-900MWH (auxiliary code R-1 and later) .................... 41
[d1] KMD-900MRH (auxiliary code R-0 and earlier) ................................................. 42
[d2] KMD-900MRH (auxiliary code R-1 and later) .................................................... 43
3
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3. Timing Chart............................................................................................................... 44
4. Performance Data....................................................................................................... 46
[a] KMD-700MAH ..................................................................................................... 46
[b] KMD-700MWH .................................................................................................... 47
[c] KMD-700MRH ..................................................................................................... 48
[d] KMD-900MAH ..................................................................................................... 49
[e] KMD-900MWH .................................................................................................... 50
[f] KMD-900MRH ...................................................................................................... 51
IV. Service Diagnosis.......................................................................................................... 52
1. No Ice Production ....................................................................................................... 52
2. Evaporator is Frozen Up ............................................................................................. 55
3. Low Ice Production ..................................................................................................... 56
4. Abnormal Ice .............................................................................................................. 56
5. Other........................................................................................................................... 56
V. Removal and Replacement of Components ................................................................... 57
1. Service for Refrigerant Lines ...................................................................................... 57
[a] Refrigerant Recovery........................................................................................... 57
[b] Evacuation and Recharge [R-404A] .................................................................... 57
2. Brazing ....................................................................................................................... 58
3. Removal and Replacement of Compressor................................................................ 59
4. Removal and Replacement of Drier ........................................................................... 61
5. Removal and Replacement of Expansion Valve......................................................... 61
6. Removal and Replacement of Hot Gas Valve and Line Valve .................................... 62
7. Removal and Replacement of Evaporator.................................................................. 64
8. Removal and Replacement of Water Regulating Valve (Water-Cooled Model Only) .. 65
9. Adjustment of Water Regulating Valve (Water-Cooled Model Only)............................ 66
10. Removal and Replacement of Condensing Pressure Regulator (C.P.R.) (Remote Air-
Cooled Model Only)................................................................................................. 67
11. Removal and Replacement of Thermistor ................................................................ 68
12. Removal and Replacement of Fan Motor ................................................................. 69
13. Removal and Replacement of Water Valve............................................................... 70
14. Removal and Replacement of Pump Motor .............................................................. 70
15. Removal and Replacement of Spray Tubes.............................................................. 71
16. Removal and Replacement of Bin Control ............................................................... 72
VI. Cleaning and Maintenance Instructions ........................................................................ 73
1. Preparing the Icemaker for Long Storage ................................................................... 73
2. Cleaning Instructions.................................................................................................. 76
[a] Cleaning Procedure ............................................................................................ 76
[b] Sanitizing Procedure - Following Cleaning Procedure ....................................... 79
3. Maintenance............................................................................................................... 80
4
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I. Specifications
1. KMD-700MAH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
13.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
14.3 A
20 A
Ambient
WATER TEMP. (°F)
70
Temp.(°F)
50
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*696 (316)
661 (300)
650 (295)
641 (291)
650 (295)
589 (267)
*539 (244)
526 (239)
593 (269)
536 (243)
483 (219)
432 (196)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
1590(7.1)
202(37.5)
70/50°F
1540(5.3)
406(58.4)
30" x 24.6" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Level Switch and Timer
Hermetic, Model CS10K6E-PFV-237
Air-Cooled, Fin and Tube Type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R-404A, 2 lb. 8.6 oz. (1150g)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
45 - 90° F
WATER SUPPLY PRESSURE
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
5
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2. KMD-700MWH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
12 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
12.9
20 A
Ambient
WATER TEMP. (°F)
Temp.(°F)
50
70
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*701 (318)
681 (309)
675 (306)
665 (302)
675 (306)
640 (290)
*611 (277)
601 (273)
634 (288)
597 (271)
569 (258)
530 (240)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
1520(6.0)
203(33.3)
607(99)
70/50°F
1500(5.1)
272(38.9)
403(58)
30" x 24.6" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
Condenser Inlet 1/2" FPT
Condenser Outlet 3/8" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
Pressure Regulator
Mechanical Level Switch and Timer
Hermetic, Model CS10K6E-PFV-237
Water-cooled, Tube in Tube Type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R-404A, 1 lb. 10 Oz. (730g)
High 427PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
45 - 90° F
WATER SUPPLY PRESSURE
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
6
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3. KMD-700MRH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
13 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
13.15 A
20 A
Ambient
WATER TEMP. (°F)
Temp.(°F)
50
70
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*730 (331)
719 (326)
715 (324)
690 (313)
715 (324)
696 (316)
*679 (308)
662 (300)
655 (297)
614 (278)
605 (275)
538 (244)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
1790(6.3)
218(32.1)
70/50°F
1750(5.7)
385(52.7)
30" x 24.6" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 203 lbs. (92 kg), Shipping 235 lbs. (107 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Level Switch and Timer
Hermetic, Model CS10K6E-PFV-279
Air-Cooled Remote, Condenser Unit URC-12 F
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-12F
R-404A, 10 lb. 0.5 oz. (4550g)
(Icemaker 5 lbs. 9.9 oz. Cond. Unit 4 lb. 6.5 oz.)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
45 - 90° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
7
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4. KMD-900MAH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
15 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
15.5 A
25 A
Ambient
WATER TEMP. (°F)
Temp.(°F)
50
70
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*875 (397)
850 (386)
842 (382)
817 (370)
842 (382)
799 (362)
*763 (346)
743 (337)
767 (348)
706 (320)
676 (307)
596 (270)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
2000(6.3)
265(34.7)
70/50°F
1930(5.3)
507(57.9)
42" x 24.6" x 28" (1067 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 240 lbs. (109 kg), Shipping 278 lbs. (126 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Level Switch and Timer
Hermetic,
Model CS14K6E-PFV-237
CONDENSER
EVAPORATOR
Air-Cooled, Fin and Tube Type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R-404A, 3 lb. 8.3 Oz. (1600g)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
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 Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
45 - 90° F
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
8
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5. KMD-900MWH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
14 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
14.7
25 A
Ambient
WATER TEMP. (°F)
Temp.(°F)
50
70
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*886 (402)
865 (392)
859 (390)
848 (385)
859 (390)
823 (373)
*793 (360)
782 (355)
816 (370)
777 (352)
747 (339)
705 (320)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER
gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
1950(5.9)
301(37.9)
831(105)
70/50°F
1950(5.3)
452(51.1)
526(59)
30" x 24.6" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 219 lbs. (99 kg), Shipping 251 lbs. (114 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
Condenser Inlet 1/2" FPT
Condenser Outlet 3/8" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
Pressure Regulator
Mechanical Level Switch and Timer
Hermetic, Model CS14K6E-PFV-237
Water-cooled, Tube in Tube Type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R-404A, 2 lb. 0 Oz. (900g)
High 427PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
45 - 90° F
WATER SUPPLY PRESSURE
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
9
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6. KMD-900MRH
AC SUPPLY VOLTAGE
AMPERAGE
208-230/60/1 (3 wire with neutral for 115V)
14 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
14.65 A
25 A
Ambient
WATER TEMP. (°F)
Temp.(°F)
50
70
90
lbs./day ( kg/day )
Reference without *marks
70
80
90
100
*906 (411)
885 (401)
878 (398)
857 (389)
878 (398)
842 (382)
*812 (368)
795 (360)
814 (369)
763 (346)
737 (335)
669 (303)
SHAPE OF ICE
Crescent Cube
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
9.6 lbs. (4.4 kg) 624 pcs.
N/A
90/70°F
2220(6.6)
266(33.4)
70/50°F
2075(5.9)
465(53.1)
30" x 24.6" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
WEIGHT
Net 226 lbs. (103 kg), Shipping 258 lbs. (117 kg)
Permanent - Connection
CONNECTIONS - ELECTRIC
- WATER SUPPLY
Inlet
1/2" FPT
- DRAIN
Outlet
3/4" FPT
5/8" OD Tube
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Level Switch and Timer
Hermetic,
Model CS14K6E-PFV-279
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
Air-Cooled Remote, Condenser Unit URC-12 F
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-12F
R-404A, 9 lb. 6 Oz. (4250g)
(Icemaker 4 lbs. 15 oz. Cond. Unit 4 lb. 7 oz.)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
OPERATING CONDITIONS
187 - 253 V
45 -100° F
AMBIENT TEMP.
WATER SUPPLY TEMP.
45 - 90° F
WATER SUPPLY PRESSURE
20 - 145 PSIG
We reserve the right to make changes in specifications and design without prior notice.
10
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7. Condensing Unit
URC-12F
11
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Specifications
MODEL: URC-12F
EXTERIOR
GalvanizedSteel
DIMENSIONS (W x D x H)
35 - 11/16” x 15-11/16” x 21-15/16”
(907.2 x 398 x 557.8 mm)
REFRIGERANTCHARGE
URC-12F
R404A 4 lbs. 7 oz. (2000 g)
WEIGHT
Net 80 lbs. (36 kg)
Shipping 87 lbs. (39 kg)
CONNECTIONS
REFRIGERANT
ELECTRICAL
OneShotCouplings(Aeroquip)
PermanentConnection
CONDENSER
Air-cooled
HEADPRESSURECONTROL
AMBIENTCONDITION
CondensingPressureRegulator
Min. -20°F - Max. +122°F
(-29°Cto+50°C)
Outdooruse
12
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II. General Information
1. Construction
[a] KMD-700MAH
EXPANSION VALVE
WATER SUPPLY INLET
HOT GAS VALVE
SPRAY TUBE
JUNCTION BOX
CONDENSER
FLOAT SWITCH
CONTROL BOX
CONDENSER
FAN MOTOR
WATER PUMP
COMPRESSOR
DRIER
BIN CONTROL
13
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[b] KMD-700MWH
EXPANSION VALVE
WATER SUPPLY INLET
SPRAY TUBE
HOT GAS VALVE
JUNCTION BOX
CONDENSER
FLOAT SWITCH
WATER
REGULATOR
CONTROL BOX
WATER PUMP
COMPRESSOR
DRIER
BIN CONTROL
14
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[c] KMD-700MRH
EXPANSION VALVE
WATER SUPPLY INLET
HOT GAS VALVE
SPRAY TUBE
JUNCTION BOX
FLOAT SWITCH
RECEIVER TANK
CONTROL BOX
DRIER
WATER PUMP
COMPRESSOR
LINE VALVE
BIN CONTROL
15
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[d] KMD-900MAH
WATER SUPPLY INLET
EXPANSION VALVE
SPRAY TUBE
HOT GAS VALVE
JUNCTION BOX
CONDENSER
CONDENSER
FAN MOTOR
FLOAT SWITCH
WATER PUMP
CONTROL BOX
DRIER
COMPRESSOR
BIN CONTROL
16
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[e] KMD-900MWH
EXPANSION VALVE
WATER SUPPLY
INLET
SPRAY TUBE
HOT GAS VALVE
JUNCTION BOX
CONDENSER
FLOAT SWITCH
WATER
REGULATOR
CONTROL BOX
WATER PUMP
DRIER
COMPRESSOR
BIN CONTROL
17
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[f] KMD-900MRH
EXPANSION VALVE
WATER SUPPLY
INLET
HOT GAS VALVE
JUNCTION BOX
SPRAY TUBE
FLOAT SWITCH
RECEIVER
TANK
CONTROL BOX
WATER PUMP
COMPRESSOR
DRIER
LINE VALVE
BIN CONTROL
18
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2. Controller Board
[a] Solid-State Control
1) A HOSHIZAKI exclusive solid-state control is employed in KMD Modular Crescent
Cubers.
2) A printed circuit board (hereafter called “controller board”) includes a stable and high
quality control system.
3) All models are pretested and factory-adjusted.
[b] Controller Board
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the unit when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board
to prevent damage to the board.
4. Do not change wiring and connections. Do not misconnect K3, K4 and
K5, because the same connector is used for the thermistor (white), float
switch (black), and mechanical bin control (red).
5. Always replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.
Part Number
2A1410-01
Type
HOS-001A (Control Products)
Features of Control Products “E” Controller Board
1) Maximum Water Supply Period - 6 minutes
Water solenoid valve opening, in the defrost (harvest) cycle, is limited by the defrost
timer. The water valve cannot remain open longer than the maximum period. The
water valve can close in less than six minutes if the defrost cycle is completed.
19
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2) Defrost Timer
The defrost cycle starts when the float switch opens and completes the freeze cycle. But
the defrost timer does not start counting until the thermistor senses 48°F at the evaporator
outlet. The period from the end of the freeze cycle up to the point of the thermistor's
sensing varies depending on the ambient and water temperatures.
3) High Temperature Safety - 127 7°F
The temperature of the suction line in the refrigerant circuit is limited by the high
temperaturesafety.
During the defrost cycle the evaporator temperature rises. The thermistor senses
48°F and starts the defrost timer. After the defrost timer counts down to zero, the
normal freeze cycle begins. If the evaporator temperature continues to rise, the
thermistor will sense the rise in temperature and at 127 7°F the thermistor
operates the high temperature safety.
This high temperature safety shuts down the circuit and the icemaker automatically stops.
This high temperature safety protects the unit from excessive temperature. The control
board will beep every 3 seconds. The white reset button on the control board must be
pressed with power on to reset the safety.
4) Low Water Safety
If the pump motor is operated without water, the mechanical seal can fail. To prevent this
type of failure, the controller board checks the position of the float switch at the end of the
initial one minute water fill cycle and at the end of each defrost cycle.
If the float switch is in the up position (electrical circuit closed), the controller board
changes to the ice making cycle. If the float switch is in the down position (electrical circuit
open), the controller board changes to a one minute water fill cycle before starting the ice
making cycle. This method allows for a low water safety shut down to protect the water
pump from mechanical seal failure.
For water-cooled model, if the water is shut off, the unit is protected by the high pressure
switch.
5) High Voltage Cutout
The maximum allowable supply voltage of this icemaker is limited by the high voltage cutout.
If miswiring (especially on single phase 3 wire models) causes excessive voltage on the
controller board, the high voltage cutout shuts down the circuit in 3 seconds and the icemaker
automatically stops. When the proper supply voltage is resumed, the icemaker automatically
starts running again. The control board will signal this problem using 7 beeps every 3
seconds.
6) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup a 5 second delay occurs while the board conducts an internal
timer check. A short beep occurs when the power switch is turned ON or OFF.
20
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The green LEDs 1-4 represent the corresponding relays and energize and sequence
5 seconds from initial startup as follows:
Time LEDs are Lit
Sequence Step
LED
Min.
Max.
Avg.
4
60 seconds
1 Minute Fill Cycle
Harvest Cycle
1, 4, and 2 2 minutes 20 minutes 3 to 5 minutes
5 minutes 60 minutes 30 to 35 minutes
1, 3, and 2 10 seconds 20 seconds factory setting
1
Freeze Cycle
Reverse Pump Out
{LED 1 – Comp; LED 2 - HGV/CFM; LED 3 – PM; LED 4 - WV}
The built in safeties shut down the unit and have alarms as follows:
No. of Beeps
(every 3 sec.)
Type of Alarm
Notes
1
High Evaporator Temp.
(temperature > 127°F)
Check for defrost problem (stuck HGV or relay),
hot water entering unit, stuck headmaster, or
shorted thermistor.
2
3
Defrost Backup Timer
(defrost > 20 min.)
Orange LED marked 20 MIN lights up.
Check for open thermistor, HGV not opening, TXV
leaking by, low charge, or inefficient compressor.
Freeze Backup Timer
(freeze > 60 min.)
Yellow LED marked 60 MIN lights up.
Check for F/S stuck closed (up), WV leaking by,
HGV leaking by, TXV not feeding properly, low
charge, or inefficient compressor.
4
5
Short Circuit
Check connections and replace wire harness if
necessary.
(between the K4 connection
on the control board and the
bin control relay)
Open Circuit
Check connections and replace wire harness if
necessary.
(between the K4 connection
on the control board and the
bin control relay)
To manually reset the above safeties, press the white alarm reset button with the power supply on.
6
Low Voltage
(92Vac or less)
High Voltage
(control voltage
> 147Vac 5%)
7
Red LED will turn off if voltage protection
operates.
The voltage safety automatically resets when
voltage is corrected.
The Output Test switch “S3” provides a relay sequence test. With power OFF, place S3
ON and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4,
normal sequence every 5 seconds. (The LEDs are not in numerical order on the board. See
the diagram on the next page for the location and numbering of LEDs). S3 should remain in
the “OFF” position for normal operation.
21
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The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied to
the K1 connector. If there is a white wire, place the switch in the C position. If this switch is
placed in the wrong position, either the compressor contactor will remain energized with the
control switch OFF, or the unit will not start.
The dip switches should be adjusted per the adjustment chart published in the Tech Specs
book. Number 8 must remain in the OFF position.
(Control Products HOS-001A Board)
22
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[c] Sequence
1st Cycle
1. Unit energized and control switch to “ICE”
position. Water supply cycle starts.
3. Thermistor reads 48°F.
Defrost timer starts counting.
2. After 1 minute,
defrost cycle starts.
IMPORTANT
Water valve
opening is limited
to 6 minutes.
&
5. After first 5 minutes in freeze cycle, cycle can
complete when float switch circuit opens.
4. Defrost timer stops counting.
If bin control signals that bin is full within first
5 minutes in freeze cycle, the machine will shut
down.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
IMPORTANT
1. Board never accepts freeze completion signal
from float switch within first 5 minutes in freeze
cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
2. If bin control signals that bin is full after first
5 minutes in freeze cycle, board will allow
machine to complete freeze cycle and following
harvest cycle.
23
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2nd Cycle and after with pump drain
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if float switch does not open.
2. Drain timer stops counting.
Pump drain is completed
1. Float switch opens and signals to complete
freeze cycle.
Drain timer starts counting.
3. Thermistor reads 48°F.
Defrost timer starts
counting.
IMPORTANT
Water valve
opening is limited to 6
minutes.
&
5. After first 5 minutes in freeze cycle, cycle can
complete when float switch circuit opens.
If bin control signals that bin is full within first
5 minutes in freeze cycle, the machine will shut
down.
4. Defrost timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts freeze completion signal
from float switch within first 5 minutes in freeze
cycle.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
2. If bin control signals that bin is full after first
5 minutes in freeze cycle, board will allow
machine to complete freeze cycle and following
harvest cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
24
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2nd Cycle and after with no pump drain
IMPORTANT
Freeze cycle time is limited to 60 minutes even
if float switch does not open.
2. Thermistor reads 48°F.
1. Float switch opens and signals to complete
freeze cycle.
Defrost timer starts counting.
IMPORTANT
Water valve
opening is limited to 6
minutes.
&
4. After first 5 minutes in freeze cycle, cycle can
complete when float switch circuit opens.
3. Defrost timer stops counting.
If bin control signals that bin is full within first
5 minutes in freeze cycle, the machine will shut
down.
Defrost cycle is completed and freeze cycle
starts.
IMPORTANT
1. Board never accepts defrost completion
signal within the first 2 minutes in defrost
cycle.
IMPORTANT
1. Board never accepts freeze completion signal
from float switch within first 5 minutes in freeze
cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
2. If bin control signals that bin is full after first
5 minutes in freeze cycle, board will allow
machine to complete freeze cycle and following
harvest cycle.
25
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[d] Controls and Adjustments
The Dip Switch is factory-adjusted to the following positions:
Switch Nos. 1 and 2:
Used for adjustment of the defrost timer.
Thedefrosttimerstartscountingwhenthethermistorreadsacertaintemperatureatthe
evaporator outlet.
Switch Nos. 3 and 4:
Used for adjustment of the drain timer.
When a freeze cycle is completed, the pump motor stops, and the icemaker resumes
operation in 2 seconds. Then the pump motor drains the water tank for the time
determined by the drain timer. The drain timer also determines the time to restrain
completion of a defrost cycle, i.e. the minimum defrost time.
Switch Nos. 5 and 6:
Used for adjustment of the drain counter.
The pump motor drains the water tank at the frequency determined by the drain
counter.
Switch No. 7:
Used only on models with mechanical bin control. Dip switch should be set “ON”.
(Models with bin thermostat, switch no. 7 should be set in the “OFF” position.)
Switch No. 8:
Used only for checking the controller board. Usually set in OFF position.
Switch Nos. 9 and 10:
Used for adjustment of freeze timer.
The freeze timer determines maximum
freeze cycle time. Upon termination of
freeze timer, machine initiates the
harvest cycle. After 2 consecutive timer
terminations, machine will shut down,
possibly indicating a problem.
26
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1) Defrost Control
A thermistor (semiconductor) is used for a defrost control sensor. The resistance varies
depending on the suction line temperatures. The thermistor detects the temperature of
the evaporator outlet to start the defrost timer. No adjustment is required. If necessary,
check for resistance between thermistor leads, and visually check the thermistor
mounting, located on the suction line next to the evaporator outlet.
Temperature (°F)
Resistance (kΩ)
14.401
10.613
6.000
0
10
32
50
70
90
3.871
2.474
1.633
Check a thermistor for resistance by using the following procedures.
(i) Disconnect the connector K3 on the board.
(ii) Remove the thermistor. See “V. 11. Removal and Replacement of Thermistor.”
(iii) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
(iv) Check for a resistance between thermistor leads.
Normal reading is within 3.5 to 7 kΩ. Replace the thermistor if it exceeds the normal
reading.
2) Defrost Timer
No adjustment is required under normal use, as the defrost timer is adjusted to the suit-
able position. However, if necessary when all the ice formed on the evaporator does not
fall into the bin in the harvest cycle, adjust the defrost timer to longer setting by adjusting
the dip switch (no. 1 & 2) on the controller board.
SETTING
TIME
Dip Switch
Dip Switch
No. 2
No. 1
OFF
ON
OFF
ON
OFF
OFF
ON
60 seconds
90 seconds
120 seconds
180 seconds
ON
27
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3) Drain Timer
The drain timer is factory-adjusted, and no adjustment is required.
SETTING
TIME
Dip Switch
Dip Switch
No. 4
No. 3
T1
T2
OFF
ON
OFF
ON
OFF
OFF
ON
10 seconds
10 seconds
10 seconds
20 seconds
150 seconds
180 seconds
120 seconds
180 seconds
ON
T1: Time to drain the water tank
T2: Time to restrain defrost completion
4) Drain Counter
The drain counter is factory-adjusted to drain the water tank every 10 cycles, and no
adjustment is required. However, where water quality is bad and the icemaker needs a
pump drain more often, the drain counter can be adjusted as shown in the table below:
SETTING
FREQUENCY
Dip Switch
Dip Switch
No. 6
No. 5
OFF
ON
OFF
ON
OFF
OFF
ON
every cycle
every 2 cycles
every 5 cycles
every 10 cycles
ON
28
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5) Freeze Timer
CAUTION
Adjust to proper specification, or the unit may not operate correctly.
Two new dip switches numbered 9 and 10 have been added to the improved “E”
board to better prevent possible freeze ups. These settings come factory set to the
default setting of 60 min. (OFF, OFF). Check the adjustment chart published in the
Tech Specs for proper settings. If the old board does not have these two dip switches,
(only 8 instead of 10), leave setting as OFF, OFF.
SETTING
TIME
Dip Switch
Dip Switch
No. 10
No. 9
OFF
ON
OFF
ON
OFF
OFF
ON
60 min.
70 min.
50 min.
60 min.
ON
6) Bin Control
CAUTION
Dip switch no. 7 must be set to the ON position. If No. 7 is set to the OFF
position, the machine will run continuously, causing a freeze-up condition.
No adjustment is required. The bin control is factory-adjusted.
29
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[e] Checking the Controller Board
1) Visually check the sequence with the icemaker operating.
2) Visually check the controller board by using the following procedures.
(i) Adjust the defrost timer to minimum position.
Disconnect the thermistor from the controller board.
Connect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2), and energize
the unit.
After the 1 minute 5 second water supply cycle and the 2 minute 10 second defrost
cycle, the unit should start the freeze cycle.
(ii) Aftertheabovestep(i), disconnectthefloatswitchleadsfromthecontrollerboardwithin
the first 5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes 20 seconds of the
freeze cycle.
(iii) Reconnect the float switch connector to the controller board. After the first 5 minutes
of the freeze cycle, disconnect the float switch leads from the controller board.
At this point, the unit should start the defrost cycle.
(iv) After step (iii), de-energize the unit and confirm that the defrost timer is in the
minimum position. Disconnect the resistor from the controller board, and energize
the unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Reconnect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2) after the
first 2 minutes of the defrost cycle.
The unit should start the freeze cycle after 1 minute 5 seconds from the resistor
connection.
3) Check the controller board by using test program of the controller board.
The output test switch “S3” provides a relay sequence test. With power OFF, place S3
on and switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1,
and 4, normal sequence every 5 seconds. S3 should remain in the “OFF” position for
normal operation.
30
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3. Mechanical Bin Control
[a] Proximity Switch
1) This machine uses a lever-actuated proximity switch (hereafter called “mechanical bin
control”) to control the ice level in the storage bin.
[b] Explanation of Operation
1) The startup and shutdown of the ice machine is controlled via the controller board. Dip
switch number 7 must be in the ON position for the controller board to receive input from the
bin control.
(i) The controller board receives a resistance value input via the red K4 connector
from the bin control. A resistor wire harness is connected from the bin control to
the controller board.
(ii) When the bin control is activated in the bin full position (pushed to the right), a
15.8 KΩ signal will be sent to the control board to shut down the unit.
(iii) When the bin control is in the normal position (bin is not full), a 7.9 KΩ reading is
sent to the control board to continue operation.
2) During operation, the controller board will only shut down the machine if a 15.8 KΩ signal is
received from the bin control during the first 5 minutes of the freeze cycle.
(i) If ice pushes the lever to the right after the first five minutes of the freeze cycle,
the controller board will allow the machine to complete the freeze cycle and the
following harvest cycle before shutting down the machine. This will prevent
incomplete batches of ice from forming on the evaporator.
31
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[c] Troubleshooting
1) Machine will not start
(i) Move dip switch no. 7 to the “OFF” position. If the machine starts up within a few
seconds, the bin control is the likely problem. If the machine does not start up,
refer to section “IV. Service Diagnosis” to verify that non-bin control related issues
are resolved.
(ii) Check to make sure shipping tape has been removed and the wires are connected
properly.
(iii) Check to make sure no obstruction prevents the lever from moving to the bin empty
position.
2) Machine will not shut off
(i) Refer to Section “IV. Service Diagnosis” to verify that non-bin control related issues
are resolved.
(ii) Dip switch no. 7 should be in the on position. If the switch is in the off position, the
controller board will not receive input from the bin control.
(iii) Move the lever to the far right.
a. If the machine does not shut off, check the resistance values of the resistor
wire harness. You should read approximately 15.8 KΩ between the black
terminal and the red terminal that connect to the K4 connector on the
controller board, when the lever is in the bin full position (far right). If this
reads approximately 7.9 KΩ, the resistors may be miswired. Switch the black
and white wires in the terminal housing or order a replacement wire harness.
b. If the preceding steps do not resolve the problem, replace the bin control
assembly.
32
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III. Technical Information
1. Water Circuit and Refrigerant Circuit
[a] KMD-700MAH and KMD-900MAH
* Note: KMD-900M_H models have two expansion valves.
33
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[b] KMD-700MWH and KMD-900MWH
* Note: KMD-900M_H models have two expansion valves.
34
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[c] KMD-700MRH and KMD-900MRH
* Note: KMD-900M_H models have two expansion valves.
35
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2. Wiring Diagrams
[a1] KMD-700MAH and KMD-700MWH (auxiliary code R-0 and earlier)
Note: Pressure Switch
MAH
MWH
21
0
21
0
Cut-out 412
Cut-in
PSIG
Cut-out 384
Cut-in
PSIG
327 21 PSIG
284 21 PSIG
36
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[a2] KMD-700MAH and KMD-700MWH (auxiliary code R-1 and later)
Note: Pressure Switch
MAH
MWH
21
0
21
0
Cut-out 412
Cut-in
PSIG
Cut-out 384
Cut-in
PSIG
327 21 PSIG
284 21 PSIG
37
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[b1] KMD-700MRH (auxiliary code R-0 and earlier)
Note: Pressure Switch
21
0
Cut-out 412
Cut-in
PSIG
327 21 PSIG
38
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[b2] KMD-700MRH (auxiliary code R-1 and later)
Note: Pressure Switch
21
0
Cut-out 412
Cut-in
PSIG
327 21 PSIG
39
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[c1] KMD-900MAH and KMD-900MWH (auxiliary code R-0 and earlier)
Note: Pressure Switch
MAH
MWH
21
0
21
0
Cut-out 412
Cut-in
PSIG
Cut-out 384
Cut-in
PSIG
327 21 PSIG
284 21 PSIG
40
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[c2] KMD-900MAH and KMD-900MWH (auxiliary code R-1 and later)
Note: Pressure Switch
MAH
MWH
21
0
21
0
Cut-out 412
Cut-in
PSIG
Cut-out 384
Cut-in
PSIG
327 21 PSIG
284 21 PSIG
41
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[d1] KMD-900MRH (auxiliary code R-0 and earlier)
Note: Pressure Switch
21
0
Cut-out 412
Cut-in
PSIG
327 21 PSIG
42
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[d2] KMD-900MRH (auxiliary code R-1 and later)
Note: Pressure Switch
21
0
Cut-out 412
Cut-in
PSIG
327 21 PSIG
43
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3. Timing Chart
Note:
*1 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See
“II. 2. [d] Controls and Adjustments.”
*2 The bin control will only shut off the ice machine during the first 5 minutes of the
freeze cycle
44
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Note:
*1 The pump motor waits for 2 seconds before starting a drain cycle. See “II. 2. [d]
Controls and Adjustments.”
*2 The icemaker does not complete a defrost cycle in the first 2 or 3 minutes. See
“II. 2. [d] Controls and Adjustments.”
*3 The bin control will only shut off the ice machine during the first 5 minutes of the
freeze cycle
45
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4. Performance Data
[a] KMD-700MAH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
316
300
650
589
295
267
593
536
269
243
696
661
90/32
650
641
295
291
244
239
483
432
219
196
539
526
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
1555
1574
1590
1605
1606
1643
1653
1710
1540
1551
1555
1575
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
1.54
1.37
1.31
347
268
202
197
1.31
1.01
0.76
310
257
180
1.18
0.97
0.68
406
361
347
80/27
90/32
gal./day m3/day
100/38
276
1.04
0.74
159
0.60
FREEZING CYCLE TIME
70/21
80/27
19
21
21
24
17
18
90/32
100/38
70/21
19
19
26
28
23
24
min.
HARVEST CYCLE TIME
2.9
2.0
3.3
80/27
90/32
3.0
2.9
2.4
2.0
2.0
2.0
min.
100/38
70/21
80/27
90/32
2.5
2.0
2.0
HEAD PRESSURE
17.6
18.8
19.2
273
304
330
19.2
21.4
23.2
293
316
346
20.6
22.3
24.3
250
268
273
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
273
19.2
3.2
3.3
3.4
3.4
334
48
52
56
56
23.5
3.4
3.7
3.9
4.0
360
51
54
58
60
25.3
3.6
3.8
4.1
4.2
45
47
48
48
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
14,590 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
46
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[b] KMD-700MWH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
318
309
675
640
306
290
634
597
288
271
701
681
90/32
675
665
306
302
277
273
569
530
258
240
611
601
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
1506
1514
1520
1531
1543
1566
1567
1610
1500
1504
1506
1523
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
2.56
2.67
2.71
715
767
810
869
2.71
2.90
3.07
915
3.46
3.97
4.02
676
706
715
80/27
90/32
1048
1061
gal./day m3/day
100/38
836
3.17
3.29
1291
4.89
FREEZING CYCLE TIME
70/21
80/27
20
20
21
22
19
19
90/32
100/38
70/21
20
20
23
24
21
21
min.
HARVEST CYCLE TIME
2.1
2.0
2.2
80/27
90/32
2.2
2.1
2.1
2.0
2.0
2.0
min.
100/38
70/21
80/27
90/32
2.1
2.0
2.0
HEAD PRESSURE
19.3
19.4
19.4
276
277
278
19.4
19.5
19.5
284
289
288
20.0
20.3
20.3
275
276
276
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
280
40
41
42
45
19.7
2.8
2.9
2.9
3.1
280
42
44
46
48
19.7
2.9
3.1
3.2
3.4
298
49
53
54
62
21.0
3.4
3.7
3.8
4.4
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
12,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
2,020 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
46 GAL./HR [AT 100oF (38oC) / WT 90oF (32oC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
LESS THAN 10 PSIG
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
47
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[c] KMD-700MRH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
331
326
715
696
324
316
655
614
297
278
730
719
90/32
715
690
324
313
308
300
605
538
275
244
679
662
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
1762
1777
1790
1794
1777
1792
1806
1820
1750
1759
1762
1765
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
1.46
1.32
1.27
336
272
218
212
1.27
1.03
0.82
303
257
195
1.15
0.97
0.74
385
348
336
80/27
90/32
gal./day m3/day
100/38
277
1.05
0.80
174
0.66
FREEZING CYCLE TIME
70/21
80/27
18
19
20
21
17
18
90/32
100/38
70/21
18
18
22
24
20
20
min.
HARVEST CYCLE TIME
2.9
2.0
3.3
80/27
90/32
3.0
2.9
2.4
2.0
2.0
2.0
min.
100/38
70/21
80/27
90/32
2.5
2.0
2.0
HEAD PRESSURE
15.1
15.5
15.6
222
232
240
15.6
16.3
16.9
236
248
256
16.6
17.5
18.0
215
221
222
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
226
35
36
36
37
15.9
2.5
2.5
2.6
2.6
244
36
38
40
41
17.1
2.6
2.7
2.8
2.9
270
39
41
43
45
19.0
2.7
2.9
3.0
3.2
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
12,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
132 CU. IN (URC-12F)
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
48
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[d] KMD-900MAH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
397
386
842
799
382
362
767
706
348
320
875
850
90/32
842
817
382
370
346
337
676
596
307
270
763
743
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
1951
1978
2000
2026
2039
2099
2109
2210
1930
1946
1951
1988
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
1.92
1.71
1.65
436
342
265
258
1.65
1.30
1.00
390
325
235
1.48
1.23
0.89
507
453
436
80/27
90/32
gal./day m3/day
100/38
351
1.33
0.98
207
0.78
FREEZING CYCLE TIME
70/21
80/27
14
15
15
17
13
13
90/32
100/38
70/21
14
14
18
20
17
17
min.
HARVEST CYCLE TIME
3.1
2.0
3.5
80/27
90/32
3.2
3.1
2.5
2.0
2.0
2.0
min.
100/38
70/21
80/27
90/32
2.6
2.0
2.0
HEAD PRESSURE
14.8
16.0
16.4
233
264
290
16.4
18.6
20.4
268
301
326
18.9
21.1
23.0
210
228
233
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
241
27
31
32
33
17.0
1.9
2.2
2.3
2.4
299
32
39
45
47
21.0
2.3
2.8
3.2
3.3
360
39
46
52
58
25.3
2.7
3.2
3.6
4.1
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
18,865 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
49
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[e] KMD-900MWH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
402
392
859
823
390
373
816
777
370
352
886
865
90/32
859
848
390
385
360
355
747
705
339
320
793
782
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
1950
1950
1950
1959
1977
1992
1986
2020
1950
1950
1950
1965
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
3.70
3.83
3.87
1023
1083
1132
1202
3.87
4.10
4.28
1260
1417
1430
4.77
5.36
5.41
978
1013
1023
80/27
90/32
gal./day m3/day
100/38
1166
4.41
4.55
1704
6.45
FREEZING CYCLE TIME
70/21
80/27
15
15
16
16
14
14
90/32
100/38
70/21
15
15
17
18
16
16
min.
HARVEST CYCLE TIME
3.0
2.5
3.2
80/27
90/32
3.0
3.0
2.7
2.4
2.3
2.4
min.
100/38
70/21
80/27
90/32
2.7
2.4
2.2
HEAD PRESSURE
19.3
19.4
19.4
276
277
278
19.4
19.5
19.5
285
290
289
20.0
20.4
20.4
275
276
276
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
280
32
33
33
36
19.7
2.2
2.3
2.3
2.5
281
33
34
35
37
19.7
2.3
2.4
2.5
2.6
300
39
43
43
50
21.1
2.7
3.0
3.0
3.5
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
13,480 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
2,440 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
61 GAL./HR [AT 100oF (38oC) / WT 90oF (32oC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
LESS THAN 10 PSIG
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
50
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[f] KMD-900MRH
APPROXIMATE ICE
WATER TEMP. (ºF/ºC)
70/21
AMBIENT TEMP.
(ºF/ºC)
PRODUCTION PER 24 HR.
50/10
90/32
70/21
80/27
411
401
878
842
398
382
814
763
369
346
906
885
90/32
878
857
398
389
368
360
737
669
335
303
812
795
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC
CONSUMPTION
70/21
80/27
90/32
2117
2173
2220
2230
2162
2211
2262
2300
2075
2107
2117
2122
watts
100/38
70/21
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
1.76
1.59
1.54
1.28
407
330
266
261
1.54
1.25
1.01
0.99
372
321
245
226
1.41
1.21
0.93
0.86
465
421
407
338
80/27
90/32
gal./day m3/day
100/38
FREEZING CYCLE TIME
70/21
80/27
13
14
14
15
13
13
90/32
100/38
70/21
13
14
16
17
15
15
min.
HARVEST CYCLE TIME
2.5
2.0
2.7
80/27
90/32
2.6
2.5
2.2
2.0
2.0
2.0
min.
100/38
70/21
80/27
90/32
2.3
2.0
2.0
HEAD PRESSURE
14.8
15.4
15.6
222
237
250
15.6
16.7
17.6
240
257
270
16.9
18.1
19.0
210
219
222
PSIG
SUCTION PRESSURE
kg/cm2G
100/38
70/21
80/27
90/32
100/38
226
26
28
28
30
15.9
1.8
2.0
2.0
2.1
255
28
31
34
35
17.9
2.0
2.2
2.4
2.5
288
34
38
40
46
20.2
2.4
2.7
2.8
3.2
PSIG
kg/cm2G
TOTAL HEAT OF REJECTION FROM CONDENSER
12,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
2,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
132 CU. IN (URC-12F)
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
Note: Pressure data is recorded at 5 minutes into freeze cycle. The data not in bold
should be used for reference only.
We reserve the right to make changes in specifications and design without prior
notice.
51
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IV. Service Diagnosis
1. No Ice Production
Problem
Possible Cause
Remedy
[1] The icemaker will not a) Power Supply
start.
1. OFF position.
1. Move to ON position.
2. Tighten.
2. Loose connection.
3. Bad contacts.
3. Check for continuity and
replace.
4. Voltage too high.
1. Blown.
4. Check and get
recommended voltage.
b) Fuse (Inside fused
disconnect, if any)
1. Check for short circuit and
replace.
c) Control Switch
1. OFF position.
2. Bad contacts.
1. Move to ICE position.
2. Check for continuity and
replace.
d) Bin Control
1. See "II.3.[c]
Troubleshooting."
e) High Pressure Control 1. Bad contacts.
1. Check for continuity and
replace.
f) Transformer
1. Thermal fuse blown or coil 1. Replace.
winding opened.
g) Wiring to Controller
Board
1. Loose connections or
open.
1. Check for continuity and
replace.
h) Thermistor
1. Leads short-circuit or open 1. See "II.2.[d] Controls and
and high temperature
safety operates.
Adjustments, 1) Defrost
Control."
i) Hot Gas Solenoid
Valve
1. Continues to open in
freeze cycle and high
temperature safety
operates.
1. Check for power off in
freeze cycle and replace.
j) Water Supply Line
1. Water supply off and water 1. Check and get
supply cycle does not
recommended pressure.
finish.
2. Condenser water pressure 2. Check and get
too low or off and pressure
control opens and closes
frequently to finally
operate high temperature
safety.
recommended pressure.
k) Water Solenoid
1. Mesh filter or orifice gets 1. Clean.
clogged and water supply
cycle does not finish.
2. Coil winding opened.
3. Wiring to water valve.
2. Replace.
3. Check for loose
connection or open, and
replace.
52
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Problem
Possible Cause
Remedy
[1] Continued from
previous page.
l) Controller Board
1. Defective.
1. See "II.2[e] Checking the
Controller Board."
m) Interlock Switch
(Cleaning Valve)
1. OFF Position
2. Bad contacts.
1. Move to ON position.
2. Check for continuity and
replace.
[2] Water continues to
be supplied, and the
icemaker will not
start.
a) Float Switch
1. Connector disconnected. 1. Place in position.
2. Leads opened or defective 2. Check and replace.
switch.
3. Float does not move
freely.
3. Clean or replace.
b) Controller Board
1. Defective.
1. Replace.
[3] Compressor will not a) Wash Switch
start or operates
1. WASH position.
2. Bad contacts.
1. Move to ICE position.
2. Check and replace.
1. Clean.
intermittently.
b) High Pressure Control 1. Dirty air filter or
condenser.
2. Ambient or condenser
2. Reduce temperature.
water temperature too
warm.
3. Refrigerant overcharged. 3. Recharge.
4. Refrigerant line or
components plugged.
4. Clean and replace drier.
5. Fan not operating. [Except 5. See chart 1.[6]
water-cooled model]
6. Condenser water pressure 6. Check and get
too low or off. [Water-
cooled model only]
recommended pressure.
c) Overload Protector
1. Bad contacts.
1. Check for continuity and
replace.
2. Voltage too low.
2. Increase voltage.
3. Refrigerant overcharged or 3. Recharge.
undercharged.
4. Line valve continues to
close in freeze cycle and
overload protector
operates.
4. Check line valve's
operation in freeze cycle
and replace.
d) Starter
1. Bad contacts.
2. Coil winding opened.
1. Check and replace.
2. Replace.
e) Start Capacitor or Run 1. Defective.
Capacitor
1. Replace.
f) Magnetic Contactor
1. Bad contacts.
1. Check for continuity and
replace.
2. Coil winding opened.
1. Wiring to compressor.
2. Replace.
g) Compressor
1. Check for loose
connection or open, and
replace.
2. Defective.
2. Replace.
3. Protector tripped.
3. Reduce temperature.
53
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Problem
Possible Cause
Remedy
[3] Continued from
previous page.
h) Controller Board
1. Defective.
1. See "II.2[e] Checking the
Controller Board."
i) Water Regulator [Water-1. Set too high.
cooled model only]
1. Adjust lower.
j) Discharge Temp.
Switch
1. Refrigerant undercharged. 1. Recharge.
2. Cooling fan not operating. 2. See chart 1.[6].
[4] Water continues to
be supplied in freeze
cycle.
a) Water Solenoid Valve 1. Diaphragm does not close. 1. Check for water leaks with
icemaker off.
b) Controller Board
1. Defective.
1. See "II.2[e] Checking the
Controller Board."
[5] No water comes from a) Water Supply Line
spray tubes. Water
1. Water pressure too low
and water level in water
tank too low.
1. Check and get
recommended pressure.
pump will not start, or
freeze cycle time is
too short.
b) Water Solenoid Valve 1. Dirty mesh filter or orifice 1. Clean.
and water level in water
tank too low.
c) Water System
d) Pump Motor
1. Water leaks.
1. Check connections for
water leaks, and replace.
2. Clogged.
2. Clean.
1. Motor winding opened.
2. Bearing worn out.
1. Replace.
2. Replace.
3. Wiring to pump motor.
3. Check for loose
connection or open, and
replace.
4. Defective capacitor.
5. Defective or bound
impeller.
4. Replace.
5. Replace and clean.
6. Mechanical seal worn out. 6. Check and replace.
e) Controller Board
a) Fan Motor
1. Defective.
1. See "II.2[e] Checking the
Controller Board."
1. Replace.
[6] Fan Motor will not
start, or is not
operating.
1. Motor winding opened.
2. Bearing worn out.
3. Wiring to fan motor.
2. Replace.
3. Check for loose
connection or open, and
replace.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
4. Replace.
5. Check and replace.
1. See "II.2[e] Checking the
Controller Board."
1. Check for leaks and
recharge.
b) Controller Board
[7] All components run, a) Refrigerant
1. Undercharged.
but no ice is
produced.
2. Air or moisture trapped.
2. Replace drier and
recharge.
b) Compressor
c) Hot Gas Solenoid
1. Defective valve.
1. Continues to open in
freeze cycle.
1. Replace.
1. Check and replace.
Valve
d) Line Valve
1. Continues to close in
freeze cycle.
1. Check and replace.
54
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Problem
Possible Cause
Remedy
[7] Continued from
previous page.
e) Water Supply Line
[Water-cooled model
only]
1. Condenser water pressure 1. Check and get
too low or off and pressure
control opens and closes
frequently.
recommended pressure.
2. Evaporator is Frozen Up
Problem
Possible Cause
Remedy
[1] Freeze cycle time is a) Float Switch
too long.
1. Leads short-circuit or
defective switch.
1. Check and replace.
2. Float does not move
freely.
2. Clean or replace.
b) Water Solenoid Valve 1. Diaphragm does not close. 1. Check for water leaks with
icemaker off.
c) Controller Board
1. Defective.
1. See "II.2[e] Checking the
Controller Board."
[2] All ice formed on
evaporator does not
fall into bin in harvest
cycle.
a) Evaporator
1. Scaled up.
1. Clean.
b) Water Supply Line
1. Water pressure too low.
1. Check and get
recommended pressure.
c) Water Solenoid Valve 1. Dirty mesh filter or orifice. 1. Clean.
2. Diaphragm does not close. 2. Check for water leaks with
icemaker off.
d) Ambient and/or water 1. Too cool.
temperature.
1. Increase temperature.
e) Line Valve
1. Continues to open in
1. Check operation in harvest
cycle and replace.
harvest cycle.
f) Thermistor
1. Out of position or loose
attachment.
1. See "V.11. Removal and
Replacement of
Thermistor."
g) Controller Board
1. Defrost timer is set too
short.
1. Adjust longer, referring to
"II.2.[d] Controls and
Adjustments, 2) Defrost
Timer."
2. Defective.
2. See "II.2[e] Checking the
Controller Board."
[3] Other
a) Spray Tubes
1. Clogged.
1. Clean
2. Out of position.
1. Dirty.
2. Place in position.
1. Clean.
b) Water System
c) Refrigerant
1. Undercharged.
1. Check for leaks and
recharge.
d) Expansion Valve
1. Bulb out of position or
loose attachment.
1. Place in position.
2. Defective.
2. Replace.
1. Replace.
2. Replace.
e) Hot Gas Solenoid
Valve
1. Coil winding opened.
2. Plunger does not move.
3. Wiring to hot gas valve.
3. Check for loose
connection or open, and
replace.
55
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3. Low Ice Production
Problem
Possible Cause
Remedy
[1] Freeze cycle time is a) See chart 1.[3] and check high pressure control and water regulator.
long.
b) See chart 2.[1] and check float switch, water solenoid valve and controller board.
[2] Harvest cycle time is a) See chart 2.[2] and check evaporator, water supply line, water solenoid valve,
long.
ambient and/or water temperature, line valve, thermistor, and controller board.
4. Abnormal Ice
Problem
Possible Cause
Remedy
[1] Small cubes.
a) Ice Cube Guide
1. Out of position. Circulated 1. Place in position.
water falls into bin.
b) See chart 1.[5] and check water supply line, water solenoid valve, water system,
pump motor, and controller board.
c) Drain Valve
1. Dirty.
1. Clean.
[2] Cloudy or irregular
cubes.
a) See chart 2.[1] and 2.[3], and check float switch, water solenoid valve, controller
board, spray tubes, water system, refrigerant charge, and expansion valve.
b) Spray Guide
c) Water Quality
1. Dirty.
1. Clean.
1. High hardness or contains 1. Install a water softener or
impurities.
filter.
5. Other
Problem
Possible Cause
Remedy
[1] Icemaker will not
stop when bin is filled
with ice.
a) Bin Control
1. See "II.3.[c]
Troubleshooting."
Abnormal noise.
[2]
a) Pump Motor
b) Fan Motor
1. Bearings worn out.
1. Bearings worn out.
2. Fan blade deformed.
1. Replace.
1. Replace.
2. Replace fan blade.
3. Fan blade does not move 3. Replace.
freely.
c) Compressor
1. Bearings worn out or
cylinder valve broken.
1. Replace.
2. Mounting pad out of
position.
2. Reinstall.
d) Refrigerant Lines
a) Bin Drain
1. Rub or touch other lines or 1. Replace.
surfaces.
[3] Ice in storage bin
often melts.
1. Plugged.
1. Clean.
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V. Removal and Replacement of Components
IMPORTANT
1. The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly.
Therefore it is important to prevent moisture from entering the system when
replacing or servicing parts.
2. Always install a new filter drier every time the sealed refrigeration system is
opened.
3. Do not leave the system open for longer than 5 minutes when replacing or
servicing parts.
1. Service for Refrigerant Lines
[a] Refrigerant Recovery
The icemaker unit is provided with two refrigerant access valves–one on the low-side and one on
the high-side line. Using proper refrigerant practices recover the refrigerant from the access
valves and store it in an approved container. Do not discharge the refrigerant into the
atmosphere.
[b] Evacuation and Recharge [R-404A]
1) Attach charging hoses, a service manifold and a vacuum pump to the system. Be sure to
connect charging hoses to both high and low-side access 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. Never allow the oil in the vacuum pump to flow backward.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on
pump capacity.
4) Close the low-side valve and high-side valve on the service manifold.
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5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-side
line. Remember to loosen the connection, and purge the air from the hose. See the
nameplate for the required refrigerant charge. Hoshizaki recommends only virgin
refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.
6) A liquid charge is recommended for charging an R-404A system. Invert the service
cylinder. Open the high-side, service manifold valve.
7) Allow the system to charge with liquid until the pressures balance.
8) If necessary, add any remaining charge to the system through the low-side. Use a
throttling valve or liquid dispensing device to add the remaining liquid charge through
the low-side access port with the unit running.
9) Close the two refrigerant access valves, and disconnect the hoses and service manifold.
10) Cap the access valves to prevent a possible leak.
2. Brazing
DANGER
1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176° F.
2. Refrigerant 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. Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
4. Do not use silver alloy or copper alloy containing arsenic.
5. Do not use R-404A as a mixture with pressurized air for leak testing.
Refrigerant leaks can be detected by charging the unit with a little refrigerant,
raising the pressure with nitrogen and using an electronic leak detector.
Note: All brazing-connections inside the evaporator case are clear-paint coated.
Sandpaper the brazing connections before unbrazing the components. Use a
good abrasive cloth to remove coating.
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3. Removal and Replacement of Compressor
IMPORTANT
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been
made.
Note: When replacing a compressor with a defective winding, be sure to install the new
start capacitor and start relay supplied with the replacement compressor. Due to
the ability of the POE oil in the compressor to absorb moisture quickly, the
compressor must not be opened more than 15 minutes for replacement or service.
Do not mix lubricants of different compressors even if both are charged with
R-404A, except when they use the same lubricant.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the terminal cover on the compressor, and disconnect the compressor wiring.
5) Remove the discharge and suction pipes using brazing equipment.
6) Remove the hold-down bolts, washers and rubber grommets.
7) Slide and remove the compressor. Unpack the new compressor package. Install the new
compressor.
8) Attach the rubber grommets of the prior compressor.
9) Sandpaper the Suction, Discharge and Process Pipes.
10) Place the compressor in position, and secure it using the bolts and washers.
11) Remove plugs from the suction, discharge and process pipes.
12) Braze the process, suction and discharge lines (do not change this order), while purging
with nitrogen gas flowing at a pressure of 3-4 PSIG.
13) Install the new filter drier.
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15) Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled
models, see the nameplate for the required refrigerant charge. For remote air-cooled
models, see the charge label in the machine compartment.
16) Connect the terminals, and replace the terminal cover in its correct position.
17) Replace the panels in their correct positions.
18) Turn on the power supply.
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4. Removal and Replacement of Drier
IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the drier.
5) Install the new drier, with the arrow on the drier, in the direction of the refrigerant
flow. Use nitrogen gas at the pressure of 3-4 PSIG when brazing the tubings.
6) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
7) Evacuate the system, and charge it with refrigerant. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote
air-cooled models, see the charge label in the machine compartment.
8) Replace the panels in their correct positions.
9) Turn on the power supply.
5. Removal and Replacement of Expansion Valve
IMPORTANT
Sometimes moisture in the refrigerant circuit exceeds the drier capacity and
freezes up at the expansion valve. Always install a new drier every time the
sealed refrigeration system is opened. Do not replace the drier until after all
other repair or replacement has been made.
1) Turn off the power supply.
2) Remove the panels.
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3) Recover the refrigerant and store it in an approved container.
4) Remove the insulation and the expansion valve bulb on the suction line.
5) Remove the expansion valve cover, and disconnect the expansion valve using
brazing equipment.
6) Braze the new expansion valve, with nitrogen gas flowing at a pressure of 3-4
PSIG.
WARNING
Always protect the valve body by using a damp cloth to prevent the valve
from overheating. Do not braze with the valve body exceeding 250°F.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system, and charge it with refrigerant. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote
air-cooled models, see the charge label in the machine compartment.
10) Attach the bulb to the suction line in position. Be sure to secure it with clamps and
to insulate it.
11) Place the new set of expansion valve covers in position.
12) Replace the panels in their correct positions.
13) Turn on the power supply.
6. Removal and Replacement of Hot Gas Valve and Line Valve
CAUTION
Always use a copper tube of the same diameter and length when replacing
the hot gas lines; otherwise performance may be reduced.
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IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made.
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the screw and the solenoid.
5) Disconnect the hot gas valve or line valve using brazing equipment.
6) Install the new valve.
WARNING
Always protect the valve body by using a damp cloth to prevent the valve
from overheating. Do not braze with the valve body exceeding 250°F.
7) Install the new drier.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system, and charge it with refrigerant. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote
air-cooled models, see the charge label in the machine compartment.
10) Cut the leads of the solenoid allowing enough lead length to reconnect using
closed end connectors.
11) Connect the new solenoid leads.
12) Attach the solenoid to the valve body, and secure it with a screw.
13) Replace the panels in their correct positions.
14) Turn on the power supply.
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7. Removal and Replacement of Evaporator
IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repairs or replacement
have been made.
1) Turn off the power supply.
2) Remove the panels and the top insulation over the evaporator.
3) Recover the refrigerant and store it in an approved container.
4) Remove the spray tubes and the insulations at the “U” shaped notch where the
refrigeration tubings go through the molded chassis.
5) Remove the insulation tube, and disconnect the evaporator inlet tubing at the tee
next to the expansion valve.
6) Lift up the evaporator, and disconnect the evaporator outlet tubing.
7) Install the new evaporator.
8) Install the new drier.
9) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
10) Evacuate the system, and charge it with refrigerant. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote
air-cooled models, see the charge label in the machine compartment.
11) Replace the removed parts in the reverse order of which they were removed.
12) Replace the top insulation and the panels in their correct positions.
13) Turn on the power supply.
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8. Removal and Replacement of Water Regulating Valve (Water-Cooled
Model Only)
IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made.
1) Turn off the power supply.
2) Close the water supply line shut-off valve.
3) Remove the panels.
4) Recover the refrigerant and store it in an approved container.
5) Disconnect the capillary tube at the condenser outlet using brazing equipment.
6) Disconnect the flare-connections of the valve.
7) Remove the screws and the valve from the bracket.
8) Install the new valve, and braze the capillary tube.
9) Install the new drier.
10) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
11) Evacuate the system, and charge it with refrigerant. See the nameplate for the
required refrigerant charge.
12) Connect the flare-connections.
13) Open the water supply line shut-off valve.
14) Check for water leaks.
15) Replace the panels in their correct positions.
16) Turn on the power supply.
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9. Adjustment of Water Regulating Valve (Water-Cooled Model Only)
The water regulating valve (also called “water regulator”) is factory-adjusted. No adjust-
ment is required under normal use. Adjust the water regulator, if necessary, using the
following procedures.
1) Attach a pressure gauge to the high-side line of the system. Or prepare a
thermometer to check for the condenser drain temperature.
2) Rotate the adjustment screw by using a flat blade screwdriver, so that the pressure
gauge shows 270 PSIG or the thermometer reads 104-115°F, 5 minutes after a
freeze cycle or icemaking process starts. When the pressure exceeds 270 PSIG, or
the condenser drain temperature exceeds 115° F, rotate the adjustment screw coun-
terclockwise. See Fig. 1.
3) Check that the pressure or the condenser drain temperature holds a stable setting.
Fig. 1
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10. Removal and Replacement of Condensing Pressure Regulator
(C.P.R.) (Remote Air-Cooled Model Only)
IMPORTANT
Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made.
1) Turn off the power supply.
2) Remove the panels from the remote condenser unit.
3) Recover the refrigerant and store it in an approved container.
4) Before heating, break off the stub on the dome to release the dome charge.
5) Disconnect the C.P.R. using brazing equipment.
6) Install the new C.P.R. Use nitrogen gas at a pressure of 3-4 PSIG when brazing the
C.P.R.
WARNING
Always protect the C.P.R. body by using a damp cloth to prevent the C.P.R.
from overheating. Do not braze with the C.P.R. body exceeding 250°F.
7) Install the new drier in the icemaker.
8) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
9) Evacuate the system and charge it with refrigerant. See the charge label in the machine
compartment in the icemaker.
10) Replace the panels in their correct positions.
11) Turn on the power supply.
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11. Removal and Replacement of Thermistor
CAUTION
1. Fragile, handle very carefully.
2. Always use a recommended sealant (high thermal conductive type),
Model KE4560RTV manufactured by Shinetsu Silicone, Part Code
60Y000-11, or Part Code 4A0683-01 equivalent.
3. Always use a recommended foam insulation (non-absorbent type) or
equivalent.
4. Do not shorten or cut the thermistor leads when installing it.
1) Turn off the power supply.
ThermistorLead
CableTie
2) Remove the panels.
3) Remove the control box cover.
4) Disconnect the thermistor leads from
the K3 connector on the controller board.
5) Remove the plastic cable ties, foam
insulation, thermistor holder and
thermistor. See Fig. 2.
FoamInsulation
ThermistorHolder
Fig. 2
6) Scrape away the old sealant on the
thermistor holder and the suction pipe.
7) Wipe off moisture or condensation on the suction pipe.
8) Smoothly apply recommended sealant (KE4560RTV, Part Code 60Y000-11 or
4A0683-01) to the thermistor holder concave.
9) Attach the new thermistor to the suction pipe very carefully to prevent damage to
the leads. And secure it using the thermistor holder and recommended foam
insulation.
Note: For models with the liquid bypass, the thermistor should be located upstream
from the liquid bypass outlet, and its end should be 4-3/4" or more away from
the outlet. See Fig. 3.
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Liquid Bypass
Flow
Fig. 3
10) Secure the insulation using the plastic cable ties.
11) Connect the thermistor leads through the bushing of the control box to the K3
connector on the controller board.
Note: Do not cut the leads of the thermistor while installing it.
12) Replace the control box cover and the panels in their correct positions.
13) Turn on the power supply.
12. Removal and Replacement of Fan Motor
Note: When replacing a fan motor with defective winding, it is recommended that a
new capacitor be installed.
1) Turn off the power supply.
2) Remove the panels.
3) Remove the junction box cover from the remote condenser unit (remote air-cooled
model).
4) Remove the closed end connectors from the fan motor leads.
5) Remove the fan motor bracket and fan motor.
6) Install the new fan motor, and replace the removed parts in the reverse order of
which they were removed.
7) Replace the panels in their correct positions.
8) Replace the junction box cover in its correct position (remote air-cooled model).
9) Turn on the power supply.
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13. Removal and Replacement of Water Valve
1) Turn off the power supply.
2) Close the water supply line shut-off valve.
3) Remove the front panel.
4) Remove the valve outlet tubing by releasing the clamp.
5) Remove the bracket from the unit.
6) Remove the fitting nut and water valve.
7) Disconnect the terminals from the water valve.
8) Install the new water valve, and replace the removed parts in the reverse order of
which they were removed.
9) Open the water supply line shut-off valve.
10) Turn on the power supply.
11) Check for leaks.
12) Replace the front panel in its correct position.
14. Removal and Replacement of Pump Motor
1) Turn off the power supply.
2) Remove the front panel.
3) Remove the base cover.
4) Drain the water tank by removing one end of the pump tubing.
5) Replace the removed parts in their correct positions.
6) Disconnect the pump suction and discharge hoses.
7) Remove the screws and the pump motor bracket.
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8) Remove the closed end connectors from the pump motor leads.
9) Remove the two screws and the pump motor bracket.
10) Remove the pump housing, and check the impeller.
11) If the impeller is defective, install a new impeller.
12) Install the new motor or new parts, and replace the removed parts in the reverse
order of which they were removed.
13) Turn on the power supply, and check for leaks.
14) Replace the base cover.
15) Replace the front panel in its correct position.
15. Removal and Replacement of Spray Tubes
1) Turn off the power supply.
2) Remove the front panel and the insulation panel.
3) Remove the rubber hoses from the spray tubes (water supply pipe).
4) Release the clamps, and disconnect the rubber hoses.
5) Remove the spray tubes by squeezing the side tabs.
6) Install the new spray tubes, and replace the removed parts in the reverse order of
which they were removed.
7) Replace the panels in their correct positions.
8) Turn on the power supply.
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16. Removal and Replacement of Bin Control
1) Turn off the power supply.
2) Remove the front panel and top panel.
3) Remove the two thumbscrews securing the switch cover.
4) Lift the bin control assembly out of the icemaker.
5) Lift off the insulation, then remove the two thumbscrews attaching the bin control to the
switch cover.
6) Use the thumbscrews to attach the new bin control to the switch cover.
7) Replace the removed parts in the reverse order of which they were removed.
Thumbscrews
Switch Cover
Insulation
BinControl
Fig. 4
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VI. Cleaning and Maintenance Instructions
1. Preparing the Icemaker for Long Storage
IMPORTANT
When shutting off the icemaker for an extended time, drain out all water from
the water line and remove the ice from the storage bin. The storage bin
should be cleaned and dried. Drain the icemaker to prevent damage to the
water supply line at sub-freezing temperatures, using a foot or hand pump.
Shut off the icemaker until the proper ambient temperature is resumed.
• Whentheicemakerisnotusedfortwoorthreedays, itissufficienttoonlymovethecontrol
switch to the “OFF” position, unless the icemaker will be at sub-freezing temperatures.
[1] On water-cooled models only, first remove the water from the water-cooled condenser:
1) Remove the front panel.
2) Move the control switch on the control box to the “OFF” position.
3) Wait 3 minutes.
4) Move the control switch to the “ICE” position.
5) Allow 5 minutes for the icemaker to fill with water and the water pump to start
operating.
6) Close the water-cooled condenser water supply line shut-off valve.
7) Open the drain valve for the water-cooled condenser water supply line.
8) Allow the line to drain by gravity.
9)Attachcompressedairorcarbondioxidesupplytothecondenserwaterlinedrainvalve.
10) Blow the water-cooled condenser out using compressed air or carbon dioxide until
water stops coming out.
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[2] Remove the water from the potable water supply line:
1) Remove the front panel. (Except water-cooled models)
2) Move the control switch on the control box to the “OFF” position.
3) Wait 3 minutes.
4) Close the potable water supply line shut-off valve and open the potable water supply line
drain valve.
5) Allow the line to drain by gravity.
6) Attach compressed air or carbon dioxide supply to the potable water line drain valve.
7) Move the control switch to the “ICE” position.
8) Quickly blow the potable water line out using compressed air or carbon dioxide.
[3] Drain the potable water tank:
1) Turn off the power supply.
2) Move the control switch on the control box to the “OFF” position.
3) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and
pulling it toward you. Remove cube guide B by removing thumbscrew. Remove cube
guide A. Remove overflow cap, overflow pipe, and water shield. See Fig. 5.
4) Remove the drain plug.
5) Remove all ice from the storage bin, and clean the storage bin.
6) Replace drain plug, water shield, overflow pipe, overflow cap, cube guide A, cube guide
B, and insulation panel in their correct positions.
7) Replace the front panel in its correct position.
8) Close the water supply line shut-off valve.
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Top View
Water Shield
Overflow Cap
Overflow Pipe
Drain Plug
Cube Guide (A)
Cube Guide (B)
Fig. 5
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2. Cleaning Instructions
WARNING
1. HOSHIZAKI recommends cleaning this unit at least once a year. More
frequent cleaning, however, may be required in some existing water
conditions.
2. To prevent injury to individuals and damage to the icemaker, do not use
ammonia type cleaners.
3. Always wear liquid-proof gloves to prevent the cleaning and sanitizing
solution from coming into contact with skin.
IMPORTANT
1. The cleaning valve is used to provide access to the inside of the
evaporator during the cleaning and sanitizing operation. It should be
closed for all icemaking operation. The compressor will not operate
unless this valve is completely closed.
2. To open the cleaning valve, the valve handle should be parallel to the
valve body. To close the valve, the valve handle should be at a right
angle to the valve body.
[a] Cleaning Procedure
1) Dilute approximately 13.5 fl. oz. of recommended cleaner Hoshizaki “Scale Away” or
“LIME-A-WAY,” (Economics Laboratory, Inc.) with 2.5 gallons of water.
2) Remove all ice from the evaporator and the storage bin.
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Note: To remove cubes on the evaporator, turn off the power supply and turn it back
on after 3 minutes. The defrost 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 removing thumbscrew,
lifting up the panel slightly and pulling it toward you. Remove cube guide B by removing
thumbscrew. Remove cube guide A. Remove overflow cap, overflow pipe, and water
shield.
5) Remove the drain plug located inside the water tank. Drain the water tank. Replace the
drain plug in its correct position.
6) Pour the cleaning solution into the water tank.
7) Fully open the cleaning valve on the left side wall of the machine compartment.
8) Move the control switch on the control box to the “WASH” position.
9) Replace water shield, overflow pipe, overflow cap, cube guide A, cube guide B, and
insulation panel in their correct positions. Replace the front panel in its correct
position.
10) Turn on the power supply, and start the washing process.
11) Turn off the power supply after 30 minutes.
12) Remove the front panel.
13) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and
pulling it toward you. Remove cube guide B by removing thumbscrew. Remove cube
guide A. Remove overflow cap, overflow pipe, and water shield.
14) Remove the drain plug located inside the water tank. Drain the water tank. Replace the
drain plug in its correct position.
15) Replace water shield, overflow pipe, overflow cap, cube guide A, cube guide B, and
insulation panel in their correct positions.
16) Move the control switch to the “ICE” position.
17) Close the cleaning valve.
18) Replace the front panel in its correct position.
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19) Turn on the power supply to fill the water tank with water.
20) Turn off the power supply after 3 minutes.
21) Remove the front panel, and fully open the cleaning valve.
22) Move the control switch to the “WASH” position.
23) Replace the front panel in its correct position.
24) Turn on the power supply to rinse off the cleaning solution.
25) Turn off the power supply after 5 minutes.
26) Remove the front panel.
27) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and
pulling it toward you. Remove cube guide B by removing thumbscrew. Remove cube
guide A. Remove overflow cap, overflow pipe, and water shield.
28) Remove the drain plug located inside the water tank. Drain the water tank. Replace the
drain plug in its correct position.
29) Replace water shield, overflow pipe, overflow cap, cube guide A, cube guide B, and
insulation panel in their correct positions.
30) Repeat the above steps 16) through 29) three more times to rinse thoroughly.
Note: If you do not sanitize the icemaker, go to step 10) in “[b] Sanitizing Procedure.”
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[b] Sanitizing Procedure - Following Cleaning Procedure
1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with water (Add approxi-
mately 1.25 fl. oz. to 2.5 gal. of water).
2) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and
pulling it toward you.
3) Pour the sanitizing solution into the water tank.
4) Replace the insulation panel and the front panel in their correct positions.
Note: Make sure that the control switch is in the “WASH” position and the cleaning valve
is open.
5) Turn on the power supply, and start the sanitizing process.
6) Turn off the power supply after 15 minutes.
7) Remove the front panel.
8) Remove the insulation panel by removing thumbscrew, lifting up the panel slightly and
pulling it toward you. Remove cube guide B by removing thumbscrew. Remove cube guide
A. Remove overflow cap, overflow pipe, and water shield.
9)Removethedrainpluglocatedinsidethewatertank. Drainthewatertank. Replacethedrain
plug in its correct position.
10) Replace water shield, overflow pipe, overflow cap, cube guide A, cube guide B, and
insulation panel in their correct positions.
11) Repeat the above steps 16) through 29) in “[a] Cleaning Procedure” two times to rinse
thoroughly.
12) Close the cleaning valve.
13) Move the control switch to the “ICE” position.
14) Replace the front panel in its correct position.
15) Clean the storage bin/dispenser unit with water.
16) Turn on the power supply, and start the automatic icemaking process.
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3. Maintenance
IMPORTANT
This icemaker must be maintained individually, referring to the instruction
manual and labels provided with the icemaker.
1) Stainless Steel Exterior
To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth. Use a
damp cloth containing a neutral cleaner to wipe off oil or dirt build up.
2) Storage Bin and Scoop
• Wash your hands before removing ice. Use the plastic scoop provided (bin
accessory).
• The storage bin/dispenser unit is for ice use only. Do not store anything else in the
bin/dispenser.
• Keep the scoop clean. Clean it by using a neutral cleaner and rinse thoroughly.
• Clean the bin/dispenser liner by using a neutral cleaner. Rinse thoroughly after
cleaning.
3) Air Filter (air-cooled models only)
A plastic mesh air filter removes dirt or dust from the air, and keeps the condenser
from getting clogged. As the filter gets clogged, the icemaker’s performance will be
reduced. Check the filter at least twice a month. When clogged, use warm water and
a neutral cleaner to wash the filter.
4) Condenser (except water-cooled models)
Check the condenser once a year, and clean if required by using a brush or vacuum
cleaner. More frequent cleaning may be required depending on the location of the
icemaker.
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