™
SERVICE MANUAL
ISSUED:
November 11, 2005
KM-1800SAH/3
KM-1800SWH/3
KM-1800SRH/3
STACKABLE CRESCENT CUBER
Reliability is a
beautiful thing
TM
REVISED:
December xx, 200x
NUMBER:
73131
2
IMPORTANT
Only qualified service technicians should attempt to service or maintain this
icemaker. No such service or maintenance should be undertaken until the
technician has thoroughly read this Service Manual.
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.
HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: HOSHIZAKI Technical Support Department
Phone: 1-800-233-1940 Technical Service
(770) 487-2331
Fax: 1-800-843-1056
(770) 487-3360
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem
3
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
A. Icemaker ....................................................................................................................... 5
1. KM-1800SAH (air-cooled) ....................................................................................... 5
2. KM-1800SAH3 (air-cooled, 3 phase) ....................................................................... 6
3. KM-1800SWH (water-cooled) .................................................................................. 7
4. KM-1800SWH3 (water-cooled, 3 phase) ................................................................. 8
5. KM-1800SRH (remote air-cooled) ........................................................................... 9
6. KM-1800SRH3 (remote air-cooled, 3 phase) ........................................................ 10
B. Condensing Unit .......................................................................................................... 11
1. URC-20F ............................................................................................................... 11
II. General Information ......................................................................................................... 13
A. Construction ................................................................................................................ 13
1. KM-1800SAH/3 ...................................................................................................... 13
2. KM-1800SWH/3 ..................................................................................................... 14
3. KM-1800SRH/3 ..................................................................................................... 15
B. Controller Board .......................................................................................................... 16
1. Solid-State Control ................................................................................................ 16
2. Controller Board .................................................................................................... 16
3. Sequence .............................................................................................................. 20
4. Controls and Adjustments ..................................................................................... 23
5. Checking the Controller Board .............................................................................. 26
III. Technical Information ...................................................................................................... 27
A. Water Circuit and Refrigerant Circuit ........................................................................... 27
1. KM-1800SAH/3 ...................................................................................................... 27
2. KM-1800SWH/3 ..................................................................................................... 28
3. KM-1800SRH/3 ..................................................................................................... 29
B. Wiring Diagrams .......................................................................................................... 30
1. KM-1800SAH .................................................................................................. 30
2. KM-1800SAH3 ....................................................................................................... 31
3. KM-1800SWH, KM-1800SRH ............................................................................... 32
4. KM-1800SWH3, KM-1800SRH3 ........................................................................... 33
C. Timing Chart ............................................................................................................... 34
D. Performance Data ....................................................................................................... 36
1. KM-1800SAH ......................................................................................................... 36
2. KM-1800SAH3 ....................................................................................................... 37
3. KM-1800SWH ........................................................................................................ 38
4. KM-1800SWH3 ...................................................................................................... 39
5. KM-1800SRH ........................................................................................................ 40
6. KM-1800SRH3 ...................................................................................................... 41
4
IV. Service Diagnosis ........................................................................................................... 42
A. No Ice Production ....................................................................................................... 42
B. Evaporator is Frozen Up ............................................................................................. 45
C. Low Ice Production ..................................................................................................... 46
D. Abnormal Ice ............................................................................................................... 46
E. Other ........................................................................................................................... 47
V. Removal and Replacement of Components .................................................................... 48
A. Service for Refrigerant Lines ...................................................................................... 48
1. Refrigerant Recovery ............................................................................................. 48
2. Evacuation and Recharge [R-404A] ...................................................................... 48
B. Brazing ........................................................................................................................ 49
C. Removal and Replacement of Compressor ................................................................ 49
D. Removal and Replacement of Drier ............................................................................ 50
E. Removal and Replacement of Expansion Valve .......................................................... 51
F. Removal and Replacement of Hot Gas Valve, Line Valve and Gas Valve .................... 52
G. Removal and Replacement of Evaporator .................................................................. 53
H. Removal and Replacement of Thermistor ................................................................... 53
I. Removal and Replacement of Fan Motor ..................................................................... 54
J. Removal and Replacement of Water Valve .................................................................. 54
K. Removal and Replacement of Pump Motor ................................................................ 55
L. Removal and Replacement of Spray Tubes ................................................................. 55
M. Removal and Replacement of Water Regulating Valve – Water-Cooled Model Only . 56
N. Adjustment Of Water Regulating Valve – Water-Cooled Model Only .......................... 57
O. Removal and Replacement of Condensing Pressure Regulator (C.P.R.) –
Remote Air-Cooled Model Only .................................................................................. 58
VI. Cleaning and Maintenance ............................................................................................. 59
A. Preparing the Icemaker for Long Storage ................................................................... 59
B. Cleaning and Sanitizing Instructions ........................................................................... 60
1. Cleaning Procedure ............................................................................................... 61
2. Sanitizing Procedure - Following Cleaning Procedure .......................................... 62
C. Maintenance ............................................................................................................... 63
5
I. Specifications
A. Icemaker
1. KM-1800SAH (air-cooled)
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 18 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 30 A
MAXIMUM FUSE SIZE 30 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1756 (797) 1685 (764) 1589 (721)
Reference without *marks 80 1702 (772) 1592 (722) 1496 (679)
90 1685 (764) *1514 (687) 1416 (642)
100 1579 (716) 1491 (676) 1326 (601)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 42.9lbs. (19.4 kg) 2160 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2979 (4.9) 2780 (3.8)
WATER gal./24HR (gal./100 lbs.) 348 (23.0) 680 (38.7)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 344 lbs. ( 156 kg ), Shipping 440 lbs. ( 200 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV-237
CONDENSER Air-cooled, Fin and Tube Type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 4 lb. 7 oz. ( 2000 g )
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
6
2. KM-1800SAH3 (air-cooled, 3 phase)
AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 11 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1757 (797) 1683 (764) 1597 (724)
Reference without *marks 80 1701 (772) 1587 (720) 1507 (684)
90 1683 (764) *1506 (683) 1422 (645)
100 1579 (716) 1486 (674) 1344 (610)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 42.9 lbs. (19.4 kg) 2160 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2949 (4.7) 2562 (3.5)
WATER gal./24HR (gal./100 lbs.) 328 (21.8) 694 (39.5)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 344 lbs. ( 156 kg ), Shipping 440 lbs. ( 200 kg )
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV-237
CONDENSER Air-cooled, Fin and Tube Type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R-404A, 4 lb. 7 oz. ( 2000 g )
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
We reserve the right to make changes in specifications and design without prior notice.
7
3. KM-1800SWH (water-cooled)
We reserve the right to make changes in specifications and design without prior notice.
No Data Available
8
4. KM-1800SWH3 (water-cooled, 3 phase)
We reserve the right to make changes in specifications and design without prior notice.
No Data Available
9
5. KM-1800SRH (remote air-cooled)
We reserve the right to make changes in specifications and design without prior notice.
SPECIFICATION NO. 05A001 ISSUED: 8/26/2005
ITEM: HOSHIZAKI STACKABLE CRESCENT CUBER
MODEL: KM-1800SRH
AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115V)
AMPERAGE 16.5 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 30 A
MAXIMUM FUSE SIZE 30 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1817 (824) 1768 (802) 1643 (745)
Reference without *marks 80 1780 (807) 1704 (773) 1546 (701)
90 1768 (802) *1651 (749) 1504 (682)
100 1723 (782) 1617 (733) 1369 (621)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 47.8 lbs. (21.7 kg) 2160 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2890(4.2) 2730(3.6)
WATER gal./24HR (gal./100 lbs.) 439(26.6) 721(39.7)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 344 lbs. (156 kg), Shipping 440 lbs. (200 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-PFV
CONDENSER Air-Cooled Remote, Condenser Unit URC-20F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-20F (210 PSI Set)
REFRIGERANT CHARGE R-404A, 15 lb. 7.0 oz. (7,000g)
(Icemaker 7 lbs. 12.0 oz. Cond. Unit 7 lb. 11.0 oz.)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 3A3453
We reserve the right to make changes in specifications and design without prior notice.
APPROVED CHECKED WRITTEN
TGray
8/26/2005
ENG.F-011.1.0205
10
6. KM-1800SRH3 (remote air-cooled, 3 phase)
We reserve the right to make changes in specifications and design without prior notice.
SPECIFICATION NO. 05A002 ISSUED: 10/3/2005
ITEM: HOSHIZAKI STACKABLE CRESCENT CUBER
MODEL: KM-1800SRH3
AC SUPPLY VOLTAGE 208-230/60/3
AMPERAGE 10.9 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *1775 (805) 1722 (781) 1618 (734)
Reference without *marks 80 1735 (787) 1653 (750) 1531 (695)
90 1722 (781) *1595 (723) 1479 (671)
100 1691 (767) 1568 (711) 1372 (622)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 47.7 lbs. (21.7 kg) 2160 pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 2860(4.3) 2660(3.6)
WATER gal./24HR (gal./100 lbs.) 456(28.6) 774(43.6)
EXTERIOR DIMENSIONS (WxDxH) 48" x 27 3/8" x 36 7/16" (1219 x 695 x 925 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 344 lbs. (156 kg), Shipping 440 lbs. (200 kg)
CONNECTIONS - ELECTRIC Permanent - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
- CONDENSATE DRAIN 3/8" OD Pipe
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model CS18K6E-TF5
CONDENSER Air-Cooled Remote, Condenser Unit URC-20F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-20F (210 PSI Set)
REFRIGERANT CHARGE R-404A, 15 lb. 7.0 oz. (7,000g)
(Icemaker 7 lbs. 12.0 oz. Cond. Unit 7 lb. 11.0 oz.)
DESIGN PRESSURE High 467 PSIG, Low 230 PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 187 - 253 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
DRAWING NO. (DIMENSION) 3A3453
We reserve the right to make changes in specifications and design without prior notice.
APPROVED CHECKED WRITTEN
TGray
10/3/05
ENG.F-011.1.0205
11
B. Condensing Unit
1. URC-20F
12
SPECIFICATIONS
MODEL: URC-20F
EXTERIOR Galvanized Steel
DIMENSIONS (W × D × H) 46 - 3/8” × 15 - 11/16” × 25 - 15/16”
(1178 × 398 × 659 mm)
REFRIGERANT CHARGE R404A 7 lbs. 11 oz. (3500 g)
WEIGHT Net 104 lbs. (47 kg)
Shipping 150 lbs. (52 kg)
CONNECTIONS
REFRIGERANT One Shot Couplings (Parker)
ELECTRICAL Permanent Connection
CONDENSER Air-Cooled
HEAD PRESSURE CONTROL
Condensing Pressure Regulator
AMBIENT CONDITION Min. -20°F to Max. +122°F
(-29°C to +50°C)
Outdoor Use
13
II. General Information
A. Construction
1. KM-1800SAH/3
Spray Tubes
Water Supply Inlet
Water Valve
Hot Gas Valve
Junction Box
Check Valves (3)
Condenser
Condenser Fan
Motors (2)
Drier
Line Valve
Capacitor Box
(KM-1800SAH)
Transformer Box
(KM-1800SAH3)
Control Box
Control Switch
Bin Control
Thermostat
Compressor
Expansion Valves (3)
Interlock
Switch
Float Switch
Water Pump
14
2. KM-1800SWH/3
Evaporator Spray Tubes Water Valve
Expansion Valves (3) Water Supply Inlet
Check Valves (3)
Hot Gas Valve
Junction Box
Control Box
Water-cooled
Condenser
Line Valve
Water Regulator
Water Pump
Float Switch
Cleaning Valve
Drier
Compressor
Control Switch Bin Control Thermostat
Capacitor Box
(KM-1800SWH)
Transformer Box
(KM-1800SWH3)
15
3. KM-1800SRH/3
Evaporator Spray Tubes Water Valve
Expansion Valves (3) Water Supply Inlet
Check Valves (3)
Hot Gas Valve
Junction Box
Control Box
Receiver Tank
Water Pump
Line Valve
Float Switch
Cleaning Valve
Drier
Compressor
Control Switch Bin Control Thermostat
Capacitor Box
(KM-1800SRH)
Transformer Box
(KM-1800SRH3)
16
B. Controller Board
1. Solid-State Control
• A HOSHIZAKI exclusive solid-state control is employed in KM-1800SAH/3,
KM-1800SWH/3 and KM-1800SRH/3 Stackable Crescent Cubers.
• A printed circuit board (hereafter called "controller board") includes a stable and high
quality control system.
• All models are pretested and factory-adjusted.
2. 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 and float switch. K4 is
not connected.
5. Always replace the whole board assembly if it goes bad.
6. Do not short out power supply to test for voltage.
Features of Control Products "E" Controller Board
a) 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.
b) 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 (9°C) 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.
Controller Board
Part Number Type
2A1410-01 HOS-001A (Control Products - 10 Pin)
17
c) High Temperature Safety - 127 ± 7°F (53 ± 4°C)
The temperature of the suction line in the refrigerant circuit is limited by the high
temperature safety.
During the defrost cycle the evaporator temperature rises. The thermistor senses
48°F (9°C) 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 (53 ± 4°C) the thermistor
operates the high temperature safety.
This high temperature safety shuts down the circuit and the icemaker automatically
stops. To reset the safety, turn the power off and back on again.
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.
d) 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 models, if the water is shut off, the unit is protected by the high
pressure switch.
e) High Voltage Cut-out
The maximum allowable supply voltage of this icemaker is limited by the high voltage
cut-out.
If miswiring (especially on single phase 3 wire models) causes excessive voltage on
the controller board, the high voltage cut-out 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.
18
f) 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.
The green LEDs 1-4 represent the corresponding relays and energize and sequence
5 seconds from initial startup as follows:
{L
ED 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:
The output test switch "S3" provides a relay sequence test. With power OFF, place S3 ON and
switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, & 4, normal
sequence every 5 seconds. S3 should remain in the "OFF" position for normal operation.
Sequence Step LED
Time LEDs are Lit
Min. Max. Avg.
1 Minute Fill Cycle
4 60 seconds
Harvest Cycle 1, 4, and 2 2 minutes 20 minutes 3 to 5 minutes
Freeze Cycle
1 5 minutes 60 minutes 30 to 35 minutes
Reverse Pump Out
1, 3, and 2 10 seconds 20 seconds factory setting
No. of Beeps
(every 3 sec.)
Type of Alarm
Notes
1 High Evaporator Temp.
(temperature > 127°F)
(53°C)
Check for defrost problem (stuck HGV
or relay), hot water entering unit, stuck
headmaster, or shorted thermistor.
2 Defrost Backup Timer
(defrost > 20 min.)
Orange LED marked H TIMER lights up.
Check for open thermistor, HGV not
opening, TXV leaking by, low charge, or
inefficient compressor.
3 Freeze Backup Timer
(freeze > 60 min. for
KM-1800SWH/3;
freeze > 70 min. for
KM-1800SAH/3 or
KM-1800SRH/3)
Yellow LED marked F TIMER lights up.
Check for F/S stuck closed (up), WV
leaking by, HGV leaking by, TXV not
feeding properly, low charge, or inefficient
compressor.
To manually reset the above safeties, press the white alarm reset button with the
power supply on.
6 Low Voltage
(92Vac or less)
7 High Voltage
(control voltage
> 147Vac ±5%)
Red LED will turn off if voltage protection
operates.
The voltage safety automatically resets
when voltage is corrected.
19
(Control Products HOS-001A Board)
The application switch located between relay X3 & X4 must be set to match the original
board application. Place this switch in the ALP position if there is no white wire supplied to
the K1 connector. If there is a white wire, place the switch in the C position. If this switch is
placed in the wrong position either the compressor contactor will remain 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. 7 & 8 must remain in the OFF position.
20
3. Sequence
1st Cycle
4. Defrost timer stops counting.
Defrost cycle is completed and freeze cycle
starts.
1. Unit energized and control switch to "ICE"
position. Water supply cycle starts.
2. After 1 minute.
Defrost cycle starts.
5. After the first 5 minutes in freeze cycle.
Ready to complete freeze cycle when float
switch circuit opens.
IMPORTANT
1. Board never accepts defrost completion signal
within the first 2 minutes in defrost cycle.
2. Defrost cycle time is limited to 20 minutes
even if defrost timer does not stop counting.
3. Thermistor reads 48°F (9°C).
Defrost timer starts counting.
IMPORTANT
Board never accepts freeze completion signal
within the first 5 minutes in freeze cycle.
IMPORTANT
Water valve opening is
limited to 6 minutes.
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