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Modular Crescent Cuber
Models
KMD-850MAH
KMD-850MWH
KMD-850MRH
“A Superior Degree of Reliability” www.hoshizaki.com
SERVICE MANUAL
Number: 73163
Issued: 9-3-2008
Revised: 1-9-2014
IMPORTANT
Only qualified service technicians should attempt to install, service, or maintain this icemaker. No service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. Failure to service and maintain the equipment in accordance with this manual may adversely affect safety, performance, and warranty coverage.
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, write, or send an e-mail message 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
E-mail: [email protected]
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.
2
IMPORTANT
This manual should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the icemaker. Read the warnings contained in this booklet carefully as they give important information regarding safety.
Please retain this booklet for any further reference that may be necessary.
CONTENTS
3
1a. KMD-850MAH Auxiliary Code C-0 and Earlier ................................................... 33
KMD-850MWH Auxiliary Code C-1 and Earlier .................................................... 33
2. KMD-850MAH and KMD-850MRH Auxiliary Code C-1 and Later ......................... 35
KMD-850MWH Auxiliary Code C-2 and Later ....................................................... 35
C. Adjustment of Water Regulating Valve - Water-Cooled Model Only ............................. 50
4
I. Specifications
A. Icemaker
1. KMD-850MAH (air-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day ( kg/day )
Reference without *marks
SHAPE OF ICE
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
CEC/CEE TIER LEVEL
ENERGY STAR
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
- DRAIN
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
OPERATING CONDITIONS
208-230/60/1 (3 wire with netrual for 115V)
9.8 A ( 5 Min. Freeze AT 104°F / WT 80°F)
20 A
20 A
Ambient
Temp.(°F)
70
80
90
100
50
*786 (357)
753 (342)
743 (337)
732 (332)
Crescent Cube
11.8 lbs. (5.4 kg) 624pcs.
WATER TEMP. (°F)
70
743 (337)
686 (311)
*639 (290)
625 (284)
N/A
90/70°F
1570(5.9)
125(19.5)
70/50°F
1510(4.6)
291(37.0)
1
NO
30" x 24-5/8" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg)
Permanent - Connection
Inlet
Outlet
1/2" FPT
3/4" FPT
5/8" OD Tube
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Lever Switch and Timer
Hermetic, Model CS08KQE-PFV-255
Air-Cooled , Fin and tube type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R404A, 2 lb. 8.2 oz. (1140g)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
90
685 (311)
629 (285)
580 (263)
526 (239)
187 - 253 V
45 -100° F
45 - 90° F
10 - 113 PSIG
Note: We reserve the right to make changes in specifications and design without prior notice.
5
2. KMD-850MWH (water-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day ( kg/day )
Reference without *marks
SHAPE OF ICE
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER gal./24HR (gal./100 lbs.)
CEC/CEE TIER LEVEL
ENERGY STAR
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
- DRAIN
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
OPERATING CONDITIONS
208-230/60/1 (3 wire with netrual for 115V)
8.3A ( 5 Min. Freeze AT 104°F / WT 80°F)
20 A
20 A
Ambient
Temp.(°F)
70
80
90
100
50
*836 (379)
831 (377)
830 (376)
809 (367)
Crescent Cube
12.1 lbs. (5.5 kg) 624pcs.
N/A
90/70°F
1390(4.1)
165(20.2)
1035(127)
WATER TEMP. (°F)
70
830 (376)
822 (373)
*815 (370)
802 (364)
70/50°F
1390(4.0)
298(35.7)
565(68)
90
786 (357)
759 (344)
759 (344)
708 (321)
2
N/A
30" x 24-5/8" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 217 lbs. (98 kg), Shipping 249 lbs. (113 kg)
Permanent - Connection
Inlet
Outlet
Cond. Inlet
Cond. Outlet
1/2" FPT
3/8" FPT
1/2" FPT
3/4" FPT
5/8" OD Tube
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
Pressure Regulator
Mechanical Lever Switch and Timer
Hermetic, Model CS08KQE-PFV-255
Water-cooled, Tube in tube type
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
R404A, 1 lb. 12.6 oz. (810g)
High 427PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
Float Switch
N/A
Ice Dispenser or Ice Storage Bin
VOLTAGE RANGE
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
187 - 253 V
45 -100° F
45 - 90° F
10 - 113 PSIG
Note: We reserve the right to make changes in specifications and design without prior notice.
6
3. KMD-850MRH (remote air-cooled)
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day ( kg/day )
Reference without *marks
SHAPE OF ICE
ICE PRODUCTION PER CYCLE
APPROXIMATE STORAGE CAPACITY
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
CEC/CEE TIER LEVEL
ENERGY STAR
EXTERIOR DIMENSIONS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- WATER SUPPLY
- DRAIN
CUBE CONTROL SYSTEM
HARVESTING CONTROL SYSTEM
ICE MAKING WATER CONTROL
COOLING WATER CONTROL
BIN CONTROL SYSTEM
COMPRESSOR
CONDENSER
EVAPORATOR
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
P.C. BOARD CIRCUIT PROTECTION
COMPRESSOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
LOW WATER PROTECTION
ACCESSORIES -SUPPLIED
-REQUIRED
OPERATING CONDITIONS
208-230/60/1 (3 wire with netrual for 115V)
9.8A ( 5 Min. Freeze AT 104°F / WT 80°F)
20 A
20 A
Ambient
Temp.(°F)
70
80
90
100
50
*833 (378)
803 (364)
793 (360)
782 (355)
Crescent Cube
11.6 lbs. (5.3 kg) 624pcs.
WATER TEMP. (°F)
70
793 (360)
741 (336)
*698 (317)
685 (311)
N/A
90/70°F
1570(5.4)
136(19.5)
70/50°F
1490(4.3)
280(33.6)
2
YES
30" x 24-5/8" x 28" (762 x 625 x 713 mm)
Stainless Steel, Galvanized Steel (Rear)
Net 203 lbs. (92 kg), Shipping 235 lbs. (107 kg)
Permanent - Connection
Inlet
Outlet
1/2" FPT
3/4" FPT
5/8" OD Tube
Float Switch
Hot Gas and Water, Thermistor and Timer
Timer Controlled. Overflow Pipe
N/A
Mechanical Lever Switch and Timer
Hermetic, Model CS08KQE-PFV-255
Air-Cooled Remote, Condenser Unit URC-9F
Vertical type, Stainless Steel and Copper
Thermostatic Expansion Valve
Condensing Pressure Regulator on URC-9F
R404A, 9 lbs. 4.2 oz. (4200g)
(Icemaker 5 lbs. 5.4 oz. Cond. Unit 3 lbs. 14.8 oz.)
High 467PSIG, Low 230PSIG
High Voltage Cut-out ( Internal )
Auto-reset Overload Protector ( Internal )
Auto-reset High Pressure Control Switch
90
738 (335)
686 (311)
641 (291)
589 (267)
Float Switch
N/A
Ice Dispenser or Ice Storage Bin, Remote Condenser Unit
VOLTAGE RANGE
AMBIENT TEMP.
WATER SUPPLY TEMP.
WATER SUPPLY PRESSURE
187 - 253 V
45 -100° F
45 - 90° F
10 - 113 PSIG
Note: We reserve the right to make changes in specifications and design without prior notice.
7
B. Condenser Unit
1. URC-9F
8
Specifications
MODEL: URC-9F
AC SUPPLY VOLTAGE
FAN MOTOR
EXTERIOR DIMENSIONS (WxDxH)
115/60/1 (Connection to Icemaker)
115 V Total 1.3FLA
65W
32-3/16" x 15-11/16" x 21-15/16" (817 x 398 x 558 mm)
DIMENSIONS INCLUDING LEGS (WxDxH) 34-5/16" x 18-1/8" x 36-15/16" (871 x 460 x 938 mm)
EXTERIOR FINISH Galvanized Steel
WEIGHT
CONNECTIONS - ELECTRIC
Net 81 lbs. ( 37 kg ) Shipping 92 lbs. ( 42 kg )
Permanent - Connection
- REFRIGERANT
CONDENSER
FAN MOTOR PROTECTION
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
OPERATING CONDITIONS
ACCESSORIES -SUPPLIED
Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)
Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)
Air-cooled, Fin and tube type
Thermal Protection
Condensing Pressure Regulator
R-404A 3 lbs. 14.8 oz. (1780g)
High 467 PSIG
VOLTAGE RANGE
AMBIENT TEMP.
104 ~ 127 V
-20 ~ 122 °F
Leg
Hex. Head Bolt w/Washer 8 x 16
Hex. Nut 8
2 pcs
8 pcs
8 pcs
Note: We reserve the right to make changes in specifications and design without prior notice.
9
II. General Information
A. Construction
1a. Air-Cooled Auxiliary Code C-0 and Earlier
Inlet Water Valve
Spray Tubes Water Supply Inlet
Hot Gas Valve
Junction Box
Condenser
Control Box
Float Switch
Drain Valve
Thermostatic
Expansion
Valves
Water Pump
Cleaning Valve
Condenser
Fan Motor
Control Switch
Drier
Compressor
Bin Control
10
1b. Air-Cooled Auxiliary Code C-1 and Later
Spray Tubes
Thermostatic
Expansion
Valves
Inlet Water Valve
Water Supply Inlet
Hot Gas Valve
Junction Box
Condenser
Control Box
Float Switch
Drain Valve
Cleaning Valve
Water Pump
Condenser
Fan Motor
Control Switch
Main Transformer
Drier
Compressor
Bin Control
11
2a. Water-Cooled Auxiliary Code C-1 and Earlier
Spray Tubes
Inlet Water Valve
Water Supply Inlet
Hot Gas Valve
Junction Box
Condenser
Control Box
Water
Regulator
Control Switch
Drier
Compressor
Float Switch
Drain Valve
Water Pump
Cleaning Valve
Thermostatic
Expansion
Valves
Bin Control
12
2b. Water-Cooled Auxiliary Code C-2 and Later
Spray Tubes Inlet Water Valve
Water Supply Inlet
Hot Gas Valve
Junction Box
Thermostatic
Expansion
Valves
Water
Regulator
Condenser
Control Box
Float Switch
Drain Valve
Water Pump
Cleaning Valve
Control Switch
Bin Control
Drier
Compressor
Main Transformer
13
3a. Remote Air-Cooled Auxiliary Code C-0 and Earlier
Inlet Water Valve
Spray Tubes
Water Supply Inlet
Hot Gas Valve
Junction Boxes
Float Switch
Drain Valve
Water Pump
Cleaning Valve
Thermostatic
Expansion
Valves
Bin Control
Control Box
Receiver Tank
Control Switch
Drier
Liquid Line Valve
Compressor
14
3b. Remote Air-Cooled Auxiliary Code C-1 and Later
Spray Tubes
Inlet Water Valve
Water Supply Inlet
Hot Gas Valve
Main Transformer
Junction
Boxes
Float Switch
Drain Valve
Water Pump
Cleaning Valve
Thermostatic
Expansion
Valves
Control Box
Receiver
Tank
Control Switch
Drier
Liquid Line Valve
Compressor
Bin Control
15
B. Sequence of Operation
The steps in the sequence are as outlined below. When power is supplied, the red
"POWER OK" LED and the green "BC CLOSED" LED on the control board come on (If the yellow "BC OPEN" LED is on, the unit will not start. In this case clear ice away from the bin control actuator). A 5-second delay occurs at startup. Note that the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.
1. One Minute Fill Cycle
LED 4 is on. WV opens and the fill period begins. After 1 minute, the board checks for a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain energized through additional 1 minute cycles until water enters the sump and F/S closes. This serves as a low water safety to protect the water pump.
2. Initial Harvest Cycle
LEDs 1, 4, and 2 are on. WV remains open, Comp, FMR, HGV energize. The control board monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), the control board reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the adjustable harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 120, and
180 seconds (S4 dip switch 1 & 2). For details, see "II.C.3.b) Harvest Timer." When the harvest timer completes its countdown, the harvest cycle is complete and the freeze cycle starts. The minimum total time allowed by the board for a complete harvest cycle is 2 minutes. WV is open during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. LED 4 goes off when WV closes.
PM energizes and runs for the last 50 seconds of harvest. LED 3 comes on when
PM energizes. At the end of harvest, the control board checks the position of F/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.
3. Freeze Cycle
LED 1 is on. Comp, FMR, and PM continue to run, FMS energizes, LLV opens, HGV closes and the freeze cycle starts. For the first 5 minutes the control board will not accept a signal from F/S. This 5 minute minimum freeze acts as a short cycle protection. At the end of 5 minutes, F/S assumes control. As ice builds on the evaporator the water level in the sump lowers. The freeze continues until F/S opens and terminates ice production.
4. Pump-Out Cycle
LEDs 1, 4, 3, and 2 are on. With S4 dip switch 5 and 6 in the factory default position, the
1st pump out occurs after the 11th freeze cycle and every 10th cycle thereafter. Comp and FMR continue to run, DV and WV open, HGV opens, LLV closes, and FMS deenergizes. PM stops for 2 seconds. SR energizes, restarting PM and taking water from the sump and forcing it to go through DV and down the drain. At the same time, water flows through the vent tube to power flush the F/S. After 10 seconds, the pump out is complete. The pump-out frequency control 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 out more often, the pump-out frequency can be adjusted.
The pump-out frequency control can be set to have a pump out occur every cycle, or every 2, 5, or 10 cycles (S4 dip switch 5 & 6). For details, see "II.C.3.d) Pump-Out
Frequency Control."
16
5. Normal Harvest Cycle
LEDs 1, 4, and 2 are on. Comp, FMR, and HGV remain energized and WV opens. PM stops. As the evaporator warms, the thermistor reaches 48°F (9°C). The control board then receives the thermistor's 3.9 kΩ signal and starts the harvest timer. When the harvest timer completes its countdown, the harvest cycle is complete. The minimum total time allowed by the board for a complete harvest cycle is 2 minutes. WV is energized during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. LED 4 goes off when WV closes. PM energizes and runs for the last
50 seconds of harvest. LED 3 comes on when PM energizes. At the end of harvest, the control board checks the position of F/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.
The unit continues to cycle through freeze and harvest cycles until the bin control activates (opens) and shuts the unit down.
Note: To prevent incomplete batches of ice from forming on the evaporator, the control board will only shut down the machine within the first 5 minutes of the freeze cycle. If ice pushes the bin control actuator in (open) after the first five minutes of the freeze cycle, the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine.
Legend: Comp–compressor; DV–Drain Valve; FMR–remote fan motor; FMS–self-contained
fan motor; F/S–float switch; HGV–hot gas valve; LLV–liquid line valve;
PM–pump motor; SR–service relay; WV–inlet water valve
17
18
C. Control Board
• A Hoshizaki exclusive solid-state control is employed in KMD-850MAH,
KMD-850MWH, and KMD-850MRH Modular Crescent Cubers.
• All models are pretested and factory-adjusted.
CAUTION
1. Fragile, handle very carefully.
2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the 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, mechanical bin control, and float switch.
5. Always replace the whole board assembly if it goes bad.
6. Do not short out power supply to test for voltage.
19
1. Control Board Layout
"G" Control Board
• Bin Control Switch
Closed LED (green)
• "ALARM RESET" Button • S4 Dip Switch
• "OUTPUT TEST" Button
(used to test relays on control board)
• Bin Control Switch
Open LED (yellow)
• Part Number
• Alarm Buzzer
• POWER OK LED
(red) (lights when
10.5VAC is supplied to K2 connector)
• Relay LEDs
(4) (indicate which relays are energized and which K1 connector pins are energized
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
• K3 (white) Connector
Thermistor
(harvest control and high temperature safety)
• K4 (red) Connector
Mechanical Bin Control
• S5 Dip Switch
• K5 (black) Connector
Float Switch
(water level)
Label
(control board revision level indicated on label on side of relay)
• K1 Connector
Pins #1 through #10
#1, 9 Magnetic Contactor or
Compressor Relay
#2 Hot Gas Valve
#3 Fan Motor
Liquid Line Valve
#4 Pump Motor (icemaking)
#5 Pump Motor
(harvest pump timer and
pump-out)
#6 Inlet Water Valve
#7, 10 Component Power
Supply
#8 Open
• K2 Connector
Control Transformer
(10.5VAC)
"G" Control Board
Part Number 2A3792-01
20
2. Features a) Maximum Water Supply Period – 6 minutes
The inlet water valve will be open during harvest for 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. b) Harvest Backup Timer and Freeze Timer
The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest cycle takes more than 20 minutes to complete. The control board will signal this problem using 2 beeps every 3 seconds.
The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle takes longer than the time specified to complete. The control board will signal this problem using 3 beeps every 3 seconds. The time is factory set using S4 dip switch 9 &
10.
The "ALARM RESET" button on the control board must be pressed with power on to reset either of these safeties.
c) High Temperature Safety
The temperature of the suction line in the refrigeration circuit is limited by the high temperature safety. This protects the unit from excessively high temperatures. If the evaporator temperature rises above 127±7°F (53±4°C), the control board reads a
.804 kΩ signal from the thermistor and operates the safety. This shuts down the circuit and the icemaker automatically stops.
The control board will signal this problem using 1 beep every 3 seconds. The "ALARM
RESET" button on the control board must be pressed with power on to reset the safety.
d) Low Water Safety
The control 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 harvest cycle. If the float switch is in the up position (electrical circuit closed), the control board changes to the ice making cycle. If the float switch is in the down position (electrical circuit open), the control board changes to additional one minute water fill cycles until water enters the sump and the float switch closes. When the float switch closes, the control board changes to the ice making cycle.
The unit will not start without adequate water in the sump. This serves as a low water safety to protect the water pump.
For water-cooled model, if the water is shut off, the unit is protected by the high pressure switch.
e) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by the high voltage and low voltage cut-outs.
If miswiring (especially on single phase 3 wire models) causes excessive voltage
(147Vac±5% or more) on the control board, the high voltage cut-out shuts down the circuit in 3 seconds and the icemaker automatically stops. The control board will signal this problem using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insufficient voltage (92Vac±5% or less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running again.
21
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 beep occurs when the control switch is moved to the "ICE" position.
The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the board is 1, 4, 3, 2.
For more information, see "II.B. Sequence of Operation."
Sequence Step
1 Minute Fill Cycle 4
LED
Energized
Components
WV
Min.
Time LEDs are On
Max.
Avg.
60 seconds
Harvest Cycle
Freeze Cycle
1, 4, and 2 WV, HGV,
Comp, FMR
1 Comp, PM,
FMR/FMS,
LLV
2 minutes 20 minutes 3 to 5 minutes
Last 50 seconds of harvest, WV de-energizes and PM energizes.
LEDs 1, 3, and 2 are on.
5 minutes freeze timer setting
30 to 35 minutes
Pump-Out Cycle 1, 4, 3, and
2
Comp, HGV,
SR, PM, DV,
FMR, WV
10 seconds 10 seconds 10 seconds
For proper operation, the pump-out timer must remain in the factory default position.
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
1
Type of Alarm
High Evaporator Temp.
(temperature > 127°F)
(53°C)
Check for harvest problem (stuck HGV or relay), hot water entering unit, stuck HM, or shorted thermistor.
Notes
2 Harvest Backup Timer
(harvest > 20 min. for two cycles in a row)
Check for open thermistor, HGV not opening,
TXV leaking by, low charge, or inefficient
Comp.
3 Freeze Timer
(freeze > specified setting for two cycles in a row)
Timer is factory set using
S4 dip switch 9 & 10
Check for F/S stuck closed (up), WV leaking by,
HGV leaking by, TXV not feeding properly, low charge, HM not bypassing, or inefficient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6
7
Low Voltage
(92Vac±5% or less)
High Voltage
(147Vac±5% or more)
Red LED will turn off if voltage protection operates.
The control voltage safeties automatically reset when voltage is corrected.
Legend: Comp–compressor; DV–Drain Valve; FMR–remote fan motor; FMS–self-contained
fan motor; F/S–float switch; HGV–hot gas valve; HM_headmaster (C.P.R.);
LLV–liquid line valve; PM–pump motor; SR–service relay; WV–inlet water valve
22
3. Controls and Adjustments a) Default Dip Switch Settings
The dip switches are factory-adjusted to the following positions:
S4 Dip Switch
Dip Switch No. Auxiliary Code 1 2
KMD-850MAH
KMD-850MRH
C-0 and Earlier OFF OFF OFF ON ON ON ON OFF OFF OFF
C-1 and Later
3 4 5 6 7 8 9 10
OFF ON OFF ON ON ON ON OFF OFF OFF
KMD-850MWH C-1 and Earlier OFF OFF OFF ON ON ON ON OFF OFF OFF
C-2 and Later OFF ON OFF ON ON ON ON OFF OFF OFF
S5 Dip Switch (Do Not Adjust)
Dip Switch No.
1 2 3 4 5
KMD-850MAH OFF OFF OFF OFF OFF
KMD-850MWH OFF OFF OFF OFF OFF
KMD-850MRH OFF OFF OFF OFF OFF
S4 Dip Switch
Freeze Timer (9 & 10)
Normally off (8)
Do not adjust (7)
Pump-Out Frequency Control (5 & 6)
Pump-Out Timer - Do not adjust (3 & 4)
Harvest Timer (1 & 2) b) Harvest Timer (S4 dip switch 1 & 2)
The harvest timer starts counting when the thermistor reads 48°F (9°C) at the evaporator outlet. No adjustment is required under normal use, as the harvest timer is adjusted to the suitable position. However, a setting longer than the factory setting may be advised in cases where the flush provided at harvest needs to be prolonged for extra cleaning.
Before changing this setting, call the Hoshizaki Technical Support Department at
1-800-233-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting will decrease 24 hour production.
Dip Switch Setting
No. 1 No. 2
OFF OFF
ON OFF
OFF ON
ON ON
Time
(seconds)
60
90
120
180
23
c) Pump-Out Timer (S4 dip switch 3 & 4)
CAUTION
Do not adjust. Leave in the factory default position; otherwise, the drain valve and water valve will not operate at pump out.
When a freeze cycle is completed and a pump out is called for, the pump motor stops for 2 seconds. The pump motor then restarts and the drain valve and water valve open.
Water is taken from the sump and pumped through the drain valve and down the drain for
10 seconds. The pump-out timer also acts in place of the harvest timer during cycles with a pump out.
The pump-out timer is factory-adjusted. Leave in the factory default position; otherwise, the drain valve and inlet water valve will not operate at pump out.
Dip Switch Setting
No. 3
OFF
ON
OFF
ON
No. 4
OFF
OFF
ON
ON
Time (seconds)
T1
10
10
10
20
T2
150
180
120
180
Inlet Water
Valve closed closed open closed
T1: Time to drain the water tank
T2: Harvest timer at pump out
Depending on the pump-out frequency control setting (dip switch 5 & 6), pump out occurs every cycle, or every 2nd, 5th, or 10th cycle.
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)
The pump motor drains the water tank at the frequency set by the pump-out frequency control.
The pump-out frequency control is factory-adjusted to drain the water tank every
10 cycles, and no adjustment is generally required. With dip switches 5 and 6 in the factory default position, the 1st pump out occurs after the 11th freeze cycle and every
10th cycle thereafter. However, where water quality is bad and the icemaker needs a pump out more often, the pump-out frequency can be adjusted as shown in the table below.
Dip Switch Setting
No. 5
OFF
ON
OFF
ON
No. 6
OFF
OFF
ON
ON
Frequency every cycle every 2 cycles every 5 cycles every 10 cycles
24
e) S4 Dip Switch 7 & 8
Factory set for optimum performance. Do not adjust.
f) Freeze Timer (S4 dip switch 9 & 10)
CAUTION
Adjust to proper specification, or the unit may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze-up issues. Upon termination of freeze timer, the control board initiates the harvest cycle. After 2 consecutive timer terminations, the control board shuts the machine down.
In this case, see "IV.B.3. Low Ice Production" for possible solutions.
The freeze timer is factory adjusted and no adjustment is required.
Dip Switch Setting
No. 9
OFF
OFF
ON
ON
No. 10
OFF
ON
OFF
ON
Time
(minutes)
60
50
70
60 g) Float Switch Control (S5 dip switch 1 through 5)
Do not adjust. These must be left in the factory default position or the unit will not operate properly.
4. Control Board Check Procedure
Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis.
1) Check the S4 dip switch settings to assure that #3, 4, 7, 8, 9, & 10 are in the factory default position. Switches 1, 2, 5, & 6 are cleaning adjustments and the settings are flexible. Check the S5 dip switch settings to assure that they are in the factory default positions. For factory defaults, see "II.C.3.a) Default Dip Switch Settings."
2) Move the control switch to the "ICE" position. The red "POWER OK" LED should come on. If the red LED is on, the control voltage is good and you can proceed to step 3. If the red LED is off, check the control transformer secondary circuit. The transformer secondary circuit includes the cleaning valve interlock switch. Make sure the interlock switch is closed; otherwise, no control voltage is supplied to the K2 connector.
Transformer output is 10.5V at 115V primary input. If the secondary circuit has proper voltage and the red LED is off, the control board is bad and should be replaced.
If the secondary circuit does not have proper voltage, check the control transformer primary circuit. Check for 115V at the 10-pin connector. Check the brown wire at pin #10 to a white neutral wire for 115V. (Always choose a white neutral wire to establish a good neutral connection when checking voltages.) For additional checks, see "IV.B.1.[1] The icemaker will not start."
25
3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control switch is in the "ICE" position, then press the "OUTPUT TEST" button. The correct lighting sequence should be 1, 4, 3, 2. Some components (e.g., the compressor) will cycle during the test. Note that the order of the relays from the outer edge of the board is 1, 4, 3, 2. After checking the sequence, the unit automatically starts at the 1 minute fill cycle. If the LEDs light in a different sequence, the control board is bad and should be replaced.
5. Control Board Replacement
Adjust the dip switches to the factory default settings. See "II.C.3.a) Default Dip Switch
Settings." S4 dip switch #8 must remain off.
If there is a switch present between relay X3 & X4, move it to the "ALP" position.
D. Harvest Control – Thermistor
A thermistor is used as a harvest control sensor. The therminstor's resistance varies depending on the suction line temperatures. The control board monitors the resistance to start the harvest timer. No adjustment is required.
1. Thermistor Check Procedure
If necessary, check the resistance between thermistor leads, and visually check the thermistor mounting, located on the suction line next to the evaporator outlet. To check the resistance between thermistor leads, follow the steps below.
1) Disconnect the connector K3 on the board.
2) Remove the thermistor. See "V.I. Removal and Replacement of Thermistor."
3) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or
3 minutes.
4) Check the resistance between thermistor leads. Normal reading is within 4.7 to 6.2 kΩ.
Replace the thermistor if it is outside the normal reading.
E. Float Switch
The float switch is used to determine that there is sufficient water in the tank after the
1 minute fill cycle and after each harvest cycle. The float switch is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle. No adjustment is required.
1. Float Switch Check Procedure
To check the float switch, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel and move the control switch to the "OFF" position.
3) Remove the insulation panel. Remove cube guide B, then remove cube guide A.
Remove the overflow cap, overflow pipe, and water shield. See Fig. 1.
4) Remove the drain plug and drain the water tank. Replace the drain plug in its correct position. Be careful not to cross thread it.
5) Replace the water shield, overflow pipe, overflow cap, cube guide A, and cube guide B in their correct positions. Be careful not to cross thread the overflow pipe.
26
6) Remove the control box cover.
7) Disconnect the black float switch connector from the K5 connector on the control board.
8) Check for continuity across the float switch leads. With the water tank empty, the float switch should be open. If open, continue to step 9. If closed, follow the steps in
"II.E.2. Float Switch Cleaning." After cleaning the float switch, check it again. Replace if necessary.
9) Reconnect the black float switch connector, then replace the control box cover.
10) Move the control switch to the "ICE" position. Replace the insulation panel and front panel in their correct positions, then turn the power supply on. After 1 minute, the
1 minute fill cycle should end and the initial harvest cycle should begin. If the initial harvest cycle begins, the float switch is good and the check is complete. If the initial harvest cycle does not begin, continue to step 11.
11) Turn off the power supply.
12) Remove the front panel.
13) Move the control switch to the "OFF" position.
14) Remove the control box cover.
15) Disconnect the black float switch connector from the K5 connector on the control board.
16) Check for continuity across the float switch leads. With the water tank full, the float switch should be closed. If the float switch is closed and the icemaker will not switch from the 1 minute fill cycle to the initial harvest cycle, replace the control board.
If open, confirm that the water tank is full. If the tank is not full, check the water supply, water filters, and inlet water valve. If the tank is full, follow the steps in "II.E.2. Float
Switch Cleaning." After cleaning the float switch, check it again. Replace if necessary.
Fig. 1
Overflow Cap
Overflow Pipe
Cube Guide A
27
Water Shield
Drain Plug
Cube Guide B
2. Float Switch Cleaning
Depending on local water conditions, scale may build up on the float switch. Scale on the switch can cause the float to stick. In this case, the float switch should be cleaned.
1) Turn off the power supply.
2) Remove the front panel and move the control switch to the "OFF" position.
3) Remove the insulation panel. Remove cube guide B, then remove cube guide A.
Remove the overflow cap, overflow pipe, and water shield. See Fig. 1.
4) Remove the drain plug and drain the water tank. Replace the drain plug in its correct position. Be careful not to cross thread it.
5) Replace the water shield, overflow pipe, overflow cap, cube guide A, and cube guide B in their correct positions. Be careful not to cross thread the overflow pipe.
6) Disconnect the vent tube and flush tube from the top of the float switch, then remove the float switch and rubber boot.
7) Remove the retainer rod from the bottom of the float switch assembly, then remove the float. Be careful not to bend the retainer rod excessively when removing it.
8) Wipe down the float switch assembly's housing, shaft, float, and retainer rod and clean the inside of the rubber boot and hose with a mixture of 1 part of Hoshizaki "Scale
Away" 25 parts of warm water. Rinse the parts thoroughly with clean water.
9) Reassemble the float switch assembly and replace it and the rubber boot in their correct positions. Reconnect the vent tube and the flush tube.
10) Move the control switch to the "ICE" position.
11) Replace the insulation panel and front panel in their correct positions.
12) Turn on the power supply to start the automatic icemaking process.
28
F. Bin Control
This machine uses a lever-actuated proximity switch (mechanical bin control) to control the ice level in the storage bin. No adjustment is required.
1. Explanation of Operation
The bin control is connected to the red K4 connector on the control board. When the bin control is calling for ice (proximity switch closed; green "BC CLOSED" LED on), the control board continues icemaking operations. When the bin control is activated in the bin full position (proximity switch open; yellow "BC OPEN" LED on), the control board shuts down the unit. However, to prevent incomplete batches of ice from forming on the evaporator, the control board will only shut down the machine within the first 5 minutes of the freeze cycle. If ice pushes the lever in after the first 5 minutes of the freeze cycle, the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine.
2. Bin Control Check Procedure
1) Clear any ice away from the bin control.
2) Move the control switch to the "ICE" position.
3) Check that the green "BC CLOSED" LED on the control board is on.
4) Activate the bin control actuator (press the actuator in). Check that the yellow "BC
OPEN" LED on the control board is on.
5) Disconnect the red K4 bin control connector from the control board.
6) Check for continuity across the bin control leads. When calling for ice, the bin control proximity switch should be closed. If open, replace the bin control. Activate the bin control actuator (press the actuator in), check for continuity across the bin control leads.
The bin control proximity switch should be open. If closed, replace the bin control.
7) Reconnect the red K4 connector. Allow the machine to cycle into the freeze cycle. In the first 5 minutes of the freeze cycle, activate the bin control actuator (press the actuator in). The yellow "BC OPEN" LED should come on and the machine should turn off. If not, replace the control board.
Fig. 2
Bin Control
Switch Closed
(calling for ice)
29
Bin Control
Switch Open
(bin full)
III. Technical Information
A. Water Circuit and Refrigeration Circuit
1. Air-Cooled Model
30
2. Water-Cooled Model
31
3. Remote Air-Cooled Model
32
B. Wiring Diagrams
1a. KMD-850MAH Auxiliary Code C-0 and Earlier
KMD-850MWH Auxiliary Code C-1 and Earlier
33
1b. KMD-850MRH Auxiliary Code C-0 and Earlier
34
2. KMD-850MAH and KMD-850MRH Auxiliary Code C-1 and Later
KMD-850MWH Auxiliary Code C-2 and Later
35
C. Performance Data
1. KMD-850MAH (air-cooled)
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m 3 /day
FREEZING CYCLE TIME min.
HARVEST CYCLE TIME min.
HEAD PRESSURE
PSIG kg/cm 2 G
SUCTION PRESSURE
PSIG kg/cm 2 G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
276
43
46
47
49
786
753
743
732
291
254
242
187
248
265
270
50/10
357
342
337
332
19
20
21
21
3.2
2.9
2.8
2.5
1510
1523
1528
1535
1.10
0.96
0.92
0.71
17.4
18.6
19.0
19.4
3.0
3.2
3.3
3.4
WATER TEMP. (ºF/ºC)
70/21
743
686
639
625
337
311
290
284
1528
1551
1570
1577
242
178
125
122
0.92
0.67
0.47
0.46
21
2.8
2.4
2.0
2.0
23
25
26
270
300
324
19.0
21.1
22.8
331
47
51
55
57
23.3
3.3
3.6
3.9
4.0
300
330
355
383
53
59
63
70
219
178
114
105
685
629
580
526
90/32
1557
1583
1601
1630
23
26
27
30
2.7
2.5
2.0
2.0
311
285
263
239
0.83
0.68
0.43
0.40
21.1
23.2
24.9
26.9
3.8
4.2
4.4
4.9
TOTAL HEAT OF REJECTION FROM CONDENSER 13,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
Note:
1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference only.
2. We reserve the right to make changes in specifications and design without prior notice.
36
2. KMD-850MWH (water-cooled)
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m min.
min.
3 /day
FREEZING CYCLE TIME
HARVEST CYCLE TIME
HEAD PRESSURE
PSIG kg/cm 2 G
SUCTION PRESSURE
PSIG kg/cm 2 G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
233
39
39
39
41
50/10
836
831
830
809
1390
1390
1390
864
939
962
1280
1403
18
18
18
19
3.0
2.8
2.7
2.4
228
229
229
379
377
376
367
3.27
3.55
3.64
4.85
16.0
16.1
16.1
16.4
2.7
2.8
2.8
2.9
WATER TEMP. (ºF/ºC)
70/21
830
822
376
373
815
802
370
364
962
1092
1200
1357
1390
1390
1390
1397
18
19
20
20
2.7
2.4
2.1
2.1
229
231
232
3.64
4.13
4.54
5.14
16.1
16.2
16.3
234
39
40
40
41
16.5
2.8
2.8
2.8
2.9
250
43
46
45
50
90/32
786
759
759
708
1413
1426
1421
1496
1450
1847
1872
2490
20
21
21
23
2.6
2.4
2.0
2.0
237
241
241
357
344
344
321
5.66
6.99
7.09
9.43
16.6
17.0
17.0
17.6
3.0
3.2
3.2
3.5
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
10,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
98 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]
less than 10 PSIG
Note:
1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference only.
2. We reserve the right to make changes in specifications and design without prior notice.
37
3. KMD-850MRH (remote air-cooled)
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m min.
min.
3 /day
FREEZING CYCLE TIME
HARVEST CYCLE TIME
HEAD PRESSURE
PSIG kg/cm 2 G
SUCTION PRESSURE
PSIG kg/cm 2 G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
229
38
40
41
43
833
803
793
782
280
248
238
190
205
219
223
50/10
18
18
19
19
2.9
2.7
2.6
2.4
378
364
360
355
1490
1508
1513
1517
1.06
0.94
0.90
0.72
14.4
15.4
15.7
16.1
2.7
2.8
2.9
3.0
WATER TEMP. (ºF/ºC)
70/21
793
741
360
336
698
685
317
311
1513
1544
1570
1576
238
182
136
134
0.90
0.69
0.52
0.51
19
20
22
22
2.6
2.3
2.0
2.0
223
248
268
15.7
17.4
18.8
274
41
44
47
49
19.3
2.9
3.1
3.3
3.4
321
47
53
55
62
218
183
127
120
738
686
641
589
90/32
1541
1569
1596
1620
21
23
24
26
2.5
2.4
2.0
2.0
250
275
296
335
311
291
267
0.82
0.69
0.48
0.45
17.6
19.3
20.8
22.6
3.3
3.7
3.9
4.4
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
11,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,800 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
121 CU. IN (URC-9F)
Note:
1. Pressure data is recorded at 5 minutes into freezing cycle. The data not in bold should be used for reference only.
2. We reserve the right to make changes in specifications and design without prior notice.
38
IV. Service Diagnosis
A. 10-Minute Diagnostic Procedure
The 10 minute check out procedure is basically a sequence check which can be used at unit start-up or for system diagnosis. Using this check out procedure will allow you to diagnose electrical system and component failures in approximately 10 minutes under normal operating conditions of 70°F (21°C) or warmer air and 50°F (10°C) or warmer water temperatures. Before conducting a 10 minute checkout, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check the
S4 dip switch settings to assure that #3, 4, 7, 8, 9, & 10 are in the factory default position.
Switches 1, 2, 5, & 6 are cleaning adjustments and the settings are flexible. Check the
S5 dip switch settings to assure that they are in the factory default positions. For factory defaults, see "II.C.3.a) Default Dip Switch Settings." As you go through the procedure, check to assure the components energize and de-energize correctly. If not, those components and controls are suspect. Check for voltage at the 10-pin connector.
1) Turn power off and access the control box.
2) Turn power on and place the control switch in the "ICE" position. A 5 second delay occurs. The red "POWER OK" LED and the green "BC CLOSED" LED on the control board come on.
3) One Minute Fill Cycle – LED 4 is on. The inlet water valve is energized. After 1 minute, the control board checks the float switch. If the float switch is closed, the unit cycles to harvest. If closed, continue to step 4. If the float switch is open, the unit repeats the 1 minute fill cycle until water enters and the float switch closes (low water safety protection during initial start up and at the end of each harvest). Diagnosis: If the inlet water valve does not open, check for no supply voltage at water valve terminals, bad coil, or plugged screen or external filter (no water flow). If unit fails to start harvest, check for open float switch or bad 1 minute timer in control board.
4) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. The inlet water valve remains energized, the contactor coil energizes to start the compressor (and fan motor on a remote condenser unit), and the hot gas valve energizes. The inlet water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds, whichever is shorter. The pump motor energizes and runs for the last 50 seconds of harvest. The evaporator warms and the thermistor senses 48°F (9°C). The control board then receives the thermistor's 3.9 kΩ signal and turns operation of harvest over to the harvest timer. The timer has settings of 60, 90, 120, and 180 seconds (S4 dip switch 1 & 2). The last 50 seconds of the harvest timer countdown, the inlet water valve de-energizes and the water pump energizes, (LED 4 goes off and LED 3 comes on).
When the harvest timer countdown is complete, the freeze cycle starts. Diagnosis:
Check if compressor is running, hot gas valve is open, inlet water valve still open.
Average harvest cycle at factory setting is 2 to 3 minutes. How long does initial harvest last? 1.5 minutes after initial harvest begins, touch the compressor discharge line. Is it hot? If not, check refrigerant pressures and compressor operation. If it is hot, touch the inlet line to the evaporator. Is it hot? If it is hot and the freeze cycle is not starting, check the harvest timer adjustment, the thermistor for open circuit, the discharge line temperature, compressor efficiency, and if the hot gas valve is fully open.
39
5) Freeze Cycle – LED 1 is on. Compressor (and fan motor on a remote air-cooled unit) remains energized, pump motor, (liquid line valve if applicable), and fan motor (selfcontained air-cooled unit) energize. The inlet water valve and hot gas valve de-energize.
The unit is held in freeze by a 5 minute short cycle protection timer. After the 5 minute short cycle protection timer terminates, the freeze cycle operation is transferred to the float switch for freeze termination. During the first 5 minutes of freeze, confirm that the evaporator temperature drops. After 5 minutes in freeze, remove the black float switch lead from the K5 connector. The unit should switch out of the freeze cycle. Diagnosis:
If the evaporator is not cold, check to see if the hot gas valve is still open or if the thermostatic expansion valve is not opening properly, if the water valve is continuing to fill the reservoir, if there are improper unit pressures, an inoperative compressor, or an inoperative headmaster (C.P.R.) (remote condenser unit only). If the unit remains in freeze with the float switch removed, replace the board.
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and conditions. Cycle times and pressures should follow performance data provided in this manual.
6) Pump-Out Cycle (10 second pump out) – LEDs 1, 4, 3, 2 are on. With S4 dip switch 5 and 6 in the factory default position, the 1st pump out occurs after the 11th freeze cycle and every 10th cycle thereafter. The pump out cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles (S4 dip switch 5 & 6).
The compressor remains energized, the hot gas valve energizes, the fan motor de-energizes (self-contained air-cooled unit only), the pump motor stops for
2 seconds. The service relay energizes, opening the drain valve and water valve and restarting the pump motor. Water is taken from the sump and pumped through the drain valve and down the drain for 10 seconds. This removes contaminants from the water reservoir. Diagnosis: If the pump motor does not run, check the circuit, service relay, and capacitor. Check for proper voltage. If water does not pump out, make sure S4 dip switch 3 & 4 are in the factory default positions, check and clean the tubing at the drain valve, then check and clean the valve assembly.
7) Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.
Note: Unit continues to cycle until bin control is satisfied or power is switched off. The unit always restarts at the 1 minute fill cycle.
40
B. Diagnostic Charts
1. No Ice Production
Problem
[1] The icemaker will not start.
Possible Cause a) Power Supply 1. Off, blown fuse, or tripped breaker.
2. Loose connection.
3. Bad contacts.
b) Main Transformer
(KMD-850MAH and
KMDMRH auxiliary
Code C-1 and later,
KMD-850MWH auxiliary code C-2 and later)
4. Not within specifications.
1. Coil winding open or shorted.
Remedy
1. Turn on, replace, or reset.
2. Tighten.
3. Check for continuity and replace.
4. Refer to nameplate and correct.
1. Replace.
c) Water Supply d) Fuse (Control Box)
1. Water supply off or pressure too low.
1. Blown.
6. Refrigerant line or components plugged.
7. Condenser water pressure too low or off. (water-cooled model only)
1. Check and get recommended pressure.
1. Check for short circuit and replace.
e) Control Switch 1. "OFF" or "WASH" position.
2. Bad contacts.
1. Move to "ICE" position.
2. Check for continuity and replace.
1. Remove ice.
f) Bin Control 1. Tripped with bin filled with ice.
2. Defective.
g) High-Pressure Control 1. Bad contacts.
2. See "II.F.2. Bin Control
Check Procedure."
1. Check for continuity and replace.
2. Clean.
2. Dirty air filter or condenser.
3. Ambient or condenser water temperature too warm.
3. Reduce temperature.
4. Recharge.
4. Refrigerant overcharged.
5. Fan not operating.
(except water-cooled model)
5. See chart 1.[7].
6. Clean and replace drier.
7. Check and get recommended pressure.
41
Problem
[1] The icemaker will not start. (continued)
Possible Cause h) Control Transformer 1. Coil winding opened or shorted.
i) Wiring to Control Board 1. Loose connections or open.
j) Interlock Switch
(Cleaning Valve) k) Thermistor l) Hot Gas Valve
1. Open position.
2. Bad contacts.
Remedy
1. Replace.
1. Check for continuity and replace.
1. Move to closed position.
2. Check for continuity and replace.
1. Leads shorted or opened and high temperature or harvest backup timer safety operates. (1 beep or 2 beep alarm)
1. See "II.D. Harvest Control
– Thermistor."
1. Continues to open in freeze cycle and freeze timer safety operates. (3 beep alarm)
1. Check for hot gas valve stuck open and replace.
[2] Water continues to be supplied, and the icemaker will not start.
[3] Compressor will not start or stops operating.
m)Inlet Water Valve n) Control Board a) Float Switch b) Control Board a) Magnetic Contactor b) Start Capacitor or Run
Capacitor c) Internal Overload
Protector Open (check
1 through 3 to the right and d through f below) d) Starter
1. Mesh filter or orifice gets clogged and water supply cycle does not finish.
1. Clean.
2. Coil winding opened.
2. Replace.
3. Wiring to water valve. 3. Check for loose connection or open, and replace.
1. Defective or in alarm. 1. See "II.C.4. Control Board
Check Procedure."
1. Reconnect.
1. Connector disconnected.
2. Defective switch.
3. Float does not move freely.
2. Check and replace.
3. Clean or replace.
1. Defective.
1. See "II.C.4. Control Board
Check Procedure."
1. Bad contacts.
1. Check for continuity and replace.
2. Coil winding opened.
2. Replace.
1. Defective.
1. Replace.
1. Loose terminal.
2. Voltage.
3. Dirty condenser.
1. Tighten or replace.
2. Check and correct.
3. Clean.
1. Bad contacts.
1. Check and replace.
2. Coil winding opened.
2. Replace.
42
Problem
[3] Compressor will not start or stops operating. (continued)
Possible Cause e) Compressor f) Control Board
[4] Water continues to be supplied in freeze cycle.
a) Water Pressure b) Inlet Water Valve c) Control Board
[5] Water pump will not start.
a) Pump Motor a) Pump Motor
(continued) b) Control Board
[6] Freeze cycle time is too short.
c) Control Switch a) Drain Valve b) Float Switch c) Control Board
[7] Fan motor will not start, or is not operating. (except water-cooled model) a) Fan Motor
[8] All components run, but no ice is produced.
b) Control Board a) Refrigerant
43
1. Power supply not within specifications.
Remedy
1. Refer to nameplate and correct.
2. Wiring to compressor. 2. Check for loose connection or open, and replace.
3. Defective.
4. Protector tripped.
3. Replace.
4. Reduce temperature.
1. No power to contactor. 1. See "II.C.4. Control Board
Check Procedure."
1. Too high.
1. Reduce.
1. Diaphragm does not close.
1. Defective.
1. Check for water leaks with icemaker off.
1. See "II.C.4. Control Board
Check Procedure."
1. Replace.
1. Motor winding opened.
2. Bearing worn out.
2. Replace.
3. Wiring to pump motor. 3. Check for loose connection or open, and replace.
4. Defective capacitor.
4. Replace.
5. Defective or bound impeller.
5. Replace and clean.
6. Check and replace.
6. Mechanical seal worn out.
1. Defective.
1. Bad contacts.
1. See "II.C.4. Control Board
Check Procedure."
1. Replace.
1. Leaking by.
1. Dirty or erratic operation.
1. Defective.
1. Clean or replace.
1. Clean or replace.
1. See "II.C.4. Control Board
Check Procedure."
1. Replace.
1. Motor winding opened.
2. Bearing worn out.
2. Replace.
3. Wiring to fan motor.
3. Check for loose connection or open, and replace.
4. Defective capacitor.
4. Replace.
5. Fan blade bound.
5. Check and replace.
1. Defective.
1. Low charge.
2. Air or moisture trapped.
1. See "II.C.4. Control Board
Check Procedure."
1. Check for leaks and recharge.
2. Replace drier and recharge.
Problem
[8] All components run, but no ice is produced. (continued)
Possible Cause b) Compressor 1. Defective valve.
Remedy
1. Replace.
c) Hot Gas Valve d) Liquid Line Valve
(if applicable) e) Inlet Water Valve
1. Continues to open in freeze cycle.
1. Check and replace.
1. Continues to close in freeze cycle.
1. Water valve is wide open during freeze.
1. Check and replace.
1. Check for water leaks with icemaker off.
1. Operating erratically.
1. Check and replace.
f) Thermostatic
Expansion Valve g) Headmaster (C.P.R.)
(remote air-cooled model) h) Water Supply Line
(water-cooled model only) i) Water Regulating Valve
(water-cooled model)
1. Not operating properly and liquid line temperature too warm.
1. Replace headmaster.
1. Condenser water pressure too low or off and high pressure control opens and closes frequently.
1. Set too high.
1. Check and get recommended pressure.
1. Adjust or replace. See
"V.G. Adjustment of Water
Regulating Valve."
2. Evaporator is Frozen Up
Problem
[1]Freeze cycle time is too long.
Possible Cause a)Float Switch b)Inlet Water Valve c) Control Board d)Water Pump e)Spray Tubes f) Evaporator g)Thermostatic
Expansion Valve
[2]All ice formed on evaporator does not fall into bin in harvest cycle.
a)Evaporator b)Water Supply Line c) Water Filter System d)Inlet Water Valve e) Ambient and/or water temperature.
1. Leads short-circuit or defective switch.
2. Float does not move freely.
1. Diaphragm does not close.
1. Defective.
1. RPM too slow.
1. Clogged.
1. Scaled up.
Remedy
1. Check and replace.
2. Clean or replace.
1. Check for water leaks with icemaker off.
1. See "II.C.4. Control Board
Check Procedure."
1. Check and replace.
1. Unclog.
1. Clean.
1. Operating erratically.
1. Check and replace.
1. Scaled up.
1. Water pressure too low.
1. Dirty/Restricted.
1. Dirty mesh filter or orifice.
2. Diaphragm does not close.
1. Too cool.
1. Clean.
1. Check and get recommended pressure.
1. Replace filter.
1. Clean.
2. Check for water leaks with icemaker off.
1. Increase temperature.
44
Problem
[2]All ice formed on evaporator does not fall into bin in harvest cycle. (continued)
Possible Cause f) Liquid Line Valve
(if applicable)
[3]Other.
1. Continues to open in harvest cycle.
Remedy
1. Check operation in harvest cycle and replace.
g)Thermistor h)Control Board i) Water Regulating Valve
(water-cooled model) a)Spray Tubes
1. Out of position or loose attachment.
1. Harvest timer is set too short.
1. See "V.I. Removal and Replacement of
Thermistor."
1. Adjust longer, referring to "II.C.3. Controls and
Adjustments, b) Harvest
Timer."
2. Defective.
2. See "II.C.4. Control Board
Check Procedure."
1. Leaking by in harvest. 1. Check and replace.
b)Water System c) Refrigerant d)Thermostatic
Expansion Valve e)Hot Gas Valve f) Ice Cube Guide
1. Clogged.
2. Out of position.
1. Clean.
2. Place in position.
1. Dirty.
2. Water supply line too small; requires 3/8"
OD line dedicated per machine.
3. Water filter flow rate too small.
1. Low charge.
1. Clean.
2. Increase water line size.
3. Replace with filter that has larger flow rate.
1. Check for leaks and recharge.
1. Place in position.
1. Bulb out of position or loose attachment.
2. Defective.
2. Replace.
1. Coil winding opened.
1. Replace.
2. Plunger does not move.
3. Wiring to hot gas valve.
2. Replace.
3. Check for loose connection or open, and replace.
1. Out of position and ice trapped.
1. Place in position.
3. Low Ice Production
Problem
[1] Freeze cycle time is long.
Possible Cause Remedy a) See chart 2.[1] and check float switch, inlet water valve, control board, water pump, spray tubes, evaporator, and thermostatic expansion valve.
[2] Harvest cycle time is long.
b) See chart 1.[1] and check dirty air filter or condenser, ambient or water temperature, refrigerant charge, water pressure, and condenser water regulating valve (water-cooled model).
c) Check pump, hot gas valve, headmaster (C.P.R.) (remote air-cooled model only), thermostatic expansion valve, refrigeration check valve, and compressor.
a) See chart 2.[2] and check evaporator, water supply line, inlet water valve, ambient and/or water temperature, liquid line valve (if applicable), thermistor, control board, and hot gas valve.
45
4. Abnormal Ice
Problem
[1] Small cubes.
[2] Cloudy or irregular cubes.
Possible Cause a) Ice Cube Guide 1. Out of position.
Circulated water falls into bin.
Remedy
1. Place in position.
b) See chart 1.[5] and check water supply line, inlet water valve, water system, pump motor, and control board.
c) Drain Valve 1. Dirty.
1. Clean.
a) See chart 2.[1] and 2.[3], and check float switch, inlet water valve, control board, spray tubes, water system, refrigerant charge, and thermostatic expansion valve.
b) Spray Guide c) Water Quality
1. Dirty.
1. High hardness or contains impurities.
1. Clean.
1. Install a water softener or filter.
5. Other
Problem
[1] Icemaker will not stop when bin is filled with ice.
Possible Cause a) Bin Control
[2] Abnormal noise.
a) Pump Motor b) Fan Motor (except water-cooled model)
1. Defective.
Remedy
1. See "II.F.2. Bin Control
Check Procedure."
[3] Ice in storage bin often melts.
c) Compressor d) Refrigerant Lines a) Drain Line(s) b) Icemaker and Bin c) Ice Cube Guide
1. Bearings worn out.
3. Fan blade does not move freely.
1. Replace.
1. Bearings worn out.
1. Replace.
2. Fan blade deformed.
2. Replace.
3. Replace.
1. Replace.
1. Bearings worn out or cylinder valve broken.
2. Mounting pad out of position.
1. Rub or touch other lines or surfaces.
2. Reinstall.
1. Reposition.
1. Plugged.
1. Drains not run separately.
1. Out of position.
Circulated water falls into bin.
1. Clean.
1. Separate the drain lines.
1. Place in position.
46
V. Refrigeration Circuit and Component Service Information
IMPORTANT
• This appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Move the control switch to the "OFF" position and turn off the power supply.
Place the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the icemaker is serviced. Make sure that none have fallen into the dispenser unit/ice storage bin.
• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are clean after service.
A. Refrigeration Circuit Service Information
WARNING
• Repairs requiring the refrigeration circuit to be opened must be performed by properly trained and EPA-certified service personnel.
• Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). Do not use R-404A as a mixture with pressurized air for leak testing.
NOTICE
• Always recover the refrigerant and store it in an approved container. Do not discharge the refrigerant into the atmosphere.
• Do not leave the system open for longer than 15 min. when replacing or servicing parts. The Polyol Ester (POE) oils used in R-404A applications can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts.
• 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. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.
• When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).
1. Refrigerant Recovery
The icemaker is provided with refrigerant access valves. Using proper refrigerant practices, recover the refrigerant. Store the refrigerant in an approved container.
Do not discharge the refrigerant into the atmosphere.
47
2. Brazing
WARNING
1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C).
2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous.
4. Do not use silver alloy or copper alloy containing arsenic.
1) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
Note: Because the pipes in the evaporator case are specially coated to resist corrosion, it is important to make connections outside the evaporator case when possible. If it is necessary to braze inside the evaporator case, use sandpaper to remove the coating from the brazing connections before unbrazing the components.
NOTICE
• 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. Install the new drier with the arrow on the drier in the direction of the refrigerant flow.
• When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).
2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). Do not use R-404A as a mixture with pressurized air for leak testing.
3. Evacuation and Recharge (R-404A)
1) Attach a vacuum pump to the system. Be sure to connect 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. Open the service manifold valves. Never allow the oil in the vacuum pump to flow backwards.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity.
4) Close the low-side valve and high-side valve on the service manifold.
48
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. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the rating label inside the icemaker.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets
ARI Standard No. 700-88 be used.
6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with a dip tube, invert the service cylinder, then place it on the scales. Open the high-side valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side.
NOTICE! To prevent compressor damage, use a throttling valve or liquid dispensing device to add the remaining liquid charge through the low-side refrigerant access valve with the icemaker running.
9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold hoses.
10) Cap the access valves to prevent a possible leak.
49
B. Component Service Information
NOTICE
When replacing a component listed below, see the notes to help ensure proper operation.
Component
Compressor
Thermostatic
Expansion Valves
Notes
1 phase: Install a new start capacitor, run capacitor, and start relay.
3 phase: Install a new magnetic contactor.
• Attach the thermostatic expansion valve bulb to the suction line in the same location as the previous bulb.
• The bulb should be between the 10 and 2 o'clock positions on the tube.
• Secure the bulb with the clamp and holder, then insulate it.
• Replace the strainer if applicable.
• Use copper tube of the same diameter and length when replacing valve lines.
Hot Gas Valves
Liquid Line
Valves
Fan Motors
Pump Motor
Thermistor
KM-650MWH-M
Water Regulating
Valve
Install a new capacitor.
Install a new capacitor.
• Attach the new thermistor to the suction line in the same location as the previous thermistor.
• The thermistor should be at the 12 o'clock position on the tube.
• Smoothly fill the recessed area of the thermistor holder with high thermal conductive type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound
10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu
Silicones), or equivalent are recommended.
• Secure the thermistor with the holder, then insulate it.
• Be very careful to prevent damage to the leads.
Tighten the water regulating valve flare nut to a torque of 39.8 ft-lb/53.9 N·m.
C. Adjustment of Water Regulating Valve - Water-Cooled Model Only
The water regulating valve (also called "water regulator") is factory-adjusted. No adjustment is required under normal use. Adjust the water regulator, if necessary, using the following procedures.
1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure gauge to the high-side line of the system.
Adjustment Screw
2) Five minutes after a freeze cycle starts, confirm that the thermometer reads 104°F to 115°F (40°C to 46°C). If it does not, rotate the adjustment screw by using a flat blade screwdriver until the temperature is in the proper range. See Fig. 3. Next, check
CW – Higher
CCW – Lower that the reference pressure is in the range indicated in the Head Pressure table in the
Performance Data section. If it is not in the proper range, verify the refrigerant charge.
Top View Fig. 5
3) Check that the condenser drain temperature is stable.
50
VI. Maintenance
The maintenance schedule below is a guideline. More frequent maintenance may be required depending on water quality, the appliance's environment, and local sanitation regulations
WARNING
• Only qualified service technicians should service the appliance.
• To reduce the risk of electric shock, do not touch the control switch or service switch with damp hands
• Before servicing: Move the control switch to the "OFF" position and turn off the power supply. Place the disconnect in the "OFF" position.
Lockout/Tagout to prevent the power supply from being turned back on inadvertently.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after any maintenance is done to the icemaker. Make sure that none have fallen into the dispenser unit/ice storage bin.
Maintenance Schedule
Frequency Area Task
Daily Scoop
Bi-Weekly Air Filters
Monthly External Water
Filters
Clean the ice scoop using a neutral cleaner. Rinse thoroughly after cleaning.
Inspect. Wash with warm water and neutral cleaner if dirty.
Check for proper pressure and change if necessary.
Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining
(rust colored spots) using a non-abrasive cleanser.
Yearly
Underside of
Icemaker and Top
Kits; Bin Door and
Snout
Wipe down with a clean cloth and warm water.
Icemaker and
Dispenser Unit/Ice
Storage Bin Liner
Clean and sanitize per the cleaning and sanitizing instructions provided in the instruction manual or maintenance label on the icemaker.
Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water system. Clean the water supply inlet screen.
Condenser
Water Hoses
As Needed Marine Model
Condenser
Inspect. Clean if necessary by using a brush or vacuum cleaner. More frequent cleaning may be required depending on location.
Inspect the water hoses and clean/replace if necessary.
If contaminated seawater enters the system, flush with clean seawater or fresh water as soon as possible to minimize damage to the condenser.
51
VII. Preparing the Icemaker for Long Storage
CAUTION
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/dispenser unit. The bin/ dispenser should be cleaned and dried. Drain the icemaker to prevent damage to the water supply line at sub-freezing temperatures, using air or carbon dioxide. Shut off the icemaker until the proper ambient temperature is resumed.
When the icemaker is not used for two or three days, it is sufficient to only move the control switch to the "OFF" position, unless the icemaker will be at sub-freezing temperatures.
1. On water-cooled model only, first remove the water from the water-cooled condenser:
1) Turn off the power supply and remove the front panel and right side panel.
2) Close the condenser water supply line shut-off valve and open the condenser water supply line drain valve.
3) Attach a compressed air or carbon dioxide supply to the condenser water supply line drain valve.
4) Open the water regulating valve by using a screwdriver to pry up on the spring retainer underneath the spring. While holding the valve open, blow out the condenser using the compressed air or carbon dioxide supply until water stops coming out.
5) Close the condenser water supply line drain valve and replace the right side panel in its correct position.
2. Remove the water from the icemaker water supply line:
1) If you have not already done so, turn off the power supply and remove the front panel.
2) Close the icemaker water supply line shut-off valve and open the icemaker water supply line drain valve.
3) Allow the line to drain by gravity.
4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line drain valve.
5) Make sure at least 3 minutes have elapsed since you turned off the power supply. Make sure the control switch is in the "ICE" position. Replace the front panel in its correct position and turn on the power supply.
6) Blow the icemaker water supply line out using the compressed air or carbon dioxide supply.
7) Close the icemaker water supply line drain valve.
52
3. Drain the water tank:
1) Turn off the power supply.
2) Move the control switch to the "OFF" position.
3) Remove the insulation panel. Remove cube guide B, then remove cube guide A.
Remove the overflow cap, overflow pipe, and water shield. See Fig. 7.
4) Remove the drain plug.
5) Remove all ice from the storage bin/dispenser unit. Clean the storage bin/dispenser unit using a neutral cleaner. Rinse thoroughly after cleaning.
6) Replace the drain plug, water shield, overflow pipe, overflow cap, cube guide A, cube guide B, and insulation panel in their correct positions. Be careful not to cross thread the drain plug or overflow pipe.
7) Replace the front panel in its correct position.
53
VIII. Disposal
The appliance contains refrigerant and must be disposed of in accordance with applicable national, state, and local codes and regulations. Refrigerant must be recovered by properly certified service personnel.
54
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