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- Page 1 Hoshizaki America, Inc. “A Superior Degree of Reliability” www.hoshizaki.com Modular Crescent Cuber Serenity Series Model KMS-1230MLH Including Condensing Unit Model SRK-13H/3 SERVICE MANUAL ™ Number: 73130 Issued: 2-21-2007...
- Page 2 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.
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Page 3: Table Of Contents
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. - Page 4 . Bin Control Check Procedure ... 4 G. Switches ... 5 1. Control Switch ... 5 . Service Switch ... 5 a) DRAIN ... 5 b) CIRC..5 c) WASH ... 5 III. Technical Information ... 6 A. Water Circuit and Refrigeration Circuit ... 6 B.
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Page 5: Specifications
2648 ( 5.7 ) 303 ( 26.9 ) 570 ( 51.1 ) KMS-1230MLH : 30" x 24" x 28" ( 762 x 610 x 711 mm ) SRK-13H : 50" x 17" x 28" ( 1270 x 432 x 711 mm ) KMS-1230MLH : Stainless steel;... -
Page 6: Kms-130Mlh - Srk-13H3
2. KMS-1230MLH – SRK-13H3 Intentionally Left Blank Note: We reserve the right to make changes in specifications and design without prior notice. -
Page 7: Condensing Unit
B. Condensing Unit 1. SRK-13H AC SUPPLY VOLTAGE AMPERAGE MINIMUM CIRCUIT AMPACITY MAXIMUM FUSE SIZE EXTERIOR DIMENSIONS ( WxDxH ) DIMENSIONS INCLUDING LEGS ( WxDxH ) EXTERIOR FINISH WEIGHT CONNECTIONS - ELECTRIC - REFRIGERANT COMPRESSOR CONDENSER COMPRESSOR PROTECTION FAN MOTOR PROTECTION REFRIGERANT CIRCUIT PROTECTION REFRIGERANT CONTROL REFRIGERANT CHARGE... -
Page 8: Srk-13H3
2. SRK-13H3 Intentionally Left Blank... -
Page 9: General Information
II. General Information A. Construction 1. Icemaker Control Switch Service Switch Bin Control Switch Spray Tubes Hot Gas Valve Pump Motor Float Switch Drain Water Valve Liquid Line Valve Service Valve (High Side) Drier Wash Valve Thermistor Service Valve (Low Side) Harvest Water Valve Fill Water Valve Control Box... -
Page 10: Condensing Unit
2. Condensing Unit Headmaster (C.P. Regulator) Liquid Line Valve Junction Box Access Valve Receiver Tank Accumulator Condenser Hot Gas Valve Compressor Thermostat (Discharge Pipe) Shut-off Valve (Low Side) Fan Motor and Fan Blade Shut-off Valve (High Side) -
Page 11: Sequence Of Operation
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 in the bin area). -
Page 12: Normal Harvest Cycle
5. Normal Harvest Cycle LEDs 1, 4 and are on. Comp, FMR and HGVs remain energized. HWV and X1 relay energize, 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 count down, the harvest cycle is complete. -
Page 14: Control Board
C. Control Board • A HOSHIZAKI exclusive solid-state control is employed in the KMS-130MLH Modular Crescent Cuber. • All models are pretested and factory-adjusted. 1. Fragile, handle very carefully. . A control board contains integrated circuits, which are susceptible to failure due to static discharge. -
Page 15: Control Board Layout
1. Control Board Layout Control Products "G" Control Board Alarm Reset Button Bin Control Switch Closed LED (green) Bin Control Switch Open LED (yellow) Part Number Alarm Buzzer LED (green) Hot Gas Valves (HGV) Power LED (red) (lights when power is supplied to the board) LED 3 (green) -
Page 16: Features
2. Features a) Maximum Water Supply Period – 6 minutes The harvest 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 0 minutes to complete. -
Page 17: F) Led Lights And Audible Alarm Safeties
f) LED Lights and Audible Alarm Safeties The red LED indicates control voltage (10 to 1V at K) 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"... -
Page 18: Controls And Adjustments
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. Before changing this setting, call the HOSHIZAKI Technical Support Department at 1-800-33-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting will decrease 4 hour production. -
Page 19: C) Pump-Out Timer (S4 Dip Switch 3 & 4)
c) Pump-Out Timer (S4 dip switch 3 & 4) During cycles when a pump out is called for, the pump motor drains the water tank for the time determined by the pump-out timer. The pump-out timer also acts in place of the harvest timer during cycles with a pump out. -
Page 20: F) Freeze Timer (S4 Dip Switch 9 & 10)
f) Freeze Timer (S4 dip switch 9 & 10) 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. -
Page 21: Control Board Replacement
5. Control Board Replacement 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. -
Page 22: Float Switch
E. Float Switch 1. Explanation of Operation The float operates switches within the float switch. The lower switch (black and blue wires) is used for low water safety protection, initiating the freeze cycle refill and terminating the freeze cycle. The upper switch (black and red wires) is used to terminate the freeze cycle refill only. - Page 23 Black - Common Blue - Lower Switch Red - Upper Switch Mechanical Lock Housing Upper Switch Lower Switch Retainer Clip Float Fig. 1 Float Switch...
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Page 24: Bin Control Check Procedure
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;... -
Page 25: Switches
G. Switches Two control switches are used to control operation in KMS Series Modular Crescent Cubers. These switches are referred to as the "control switch" and the "service switch" and are located on the control box. 1. Control Switch The control switch has three positions: "OFF" for power off; "ICE" for icemaking, and "SERVICE"... -
Page 26: Technical Information
III. Technical Information A. Water Circuit and Refrigeration Circuit... -
Page 27: Wiring Diagrams
B. Wiring Diagrams 1. KMS-1230MLH – SRK-13H... - Page 28 2. KMS-1230MLH – SRK-13H3 Intentionally Left Blank...
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Page 29: Performance Data
C. Performance Data 1. KMS-1230MLH – SRK-13H APPROXIMATE ICE AMBIENT TEMP. PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day /day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG... -
Page 30: Kms-130Mlh - Srk-13H3
2. KMS-1230MLH – SRK-13H3 Intentionally Left Blank... -
Page 31: Service Diagnosis
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 (1°C) or warmer air and 50°F (10°C) or warmer water temperatures. - Page 32 5) Freeze Cycle – LED 1 is on. The compressor, fan motors and pump motor remain energized. The liquid line valves energize and the hot gas valves de-energize (also de-energizing the X1 relay). The lower float switch activates (open) times during the course of a freeze cycle;...
- Page 33 6) Pump-Out Cycle – The 1st pump out occurs after the 11th freeze cycle and every 10th cycle thereafter. LEDs 1, 3, are on. The compressor and fan motors remain energized. The drain water valve, hot gas valves and X1 relay energize, the liquid line valves de-energize.
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Page 34: Diagnostic Charts
B. Diagnostic Charts 1. No Ice Production Problem Possible Cause [1] The icemaker will not a) Power Supply to start. Condensing Unit b) High Pressure Control 1. Tripped or bad c) Thermostat (Condens- ing Unit High Tempera- ture Safety) d) Wire Harness Terminal Block: Condensing Unit and Icemaker e) Fuse (Icemaker fused... - Page 35 Problem Possible Cause [1] The icemaker will not m) Control Board start. (continuted) n) Control Board in Alarm 1. Audible alarm. [] Water continues to a) Float Switch be supplied, and the icemaker will not start. b) Control Board [3] Compressor will a) Control Switch not start or stops operating.
- Page 36 Problem Possible Cause [5] No water comes from a) Water Supply Line spray tubes. Water pump will not start, or freeze cycle time is b) Fill or Harvest Water too short. Valve c) Water System d) Pump Motor e) Control Board [6] Fan motor will a) Fan Motor not start, or is not...
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Page 37: Evaporator Is Frozen Up
2. Evaporator is Frozen Up Problem Possible Cause [1]Freeze cycle time is a) Float Switch too long. b) Fill or Harvest Water Valve c) Control Board []All ice formed on a) Evaporator evaporator does not b) Water Supply Line fall into bin in harvest cycle. -
Page 38: Low Ice Production
3. Low Ice Production Problem Possible Cause [1] Freeze cycle time is a) See chart 1.[3]. Also check dirty condenser coil, ambient temperature and long. refrigerant charge. b) See chart .[1] and check float switch, water valves and control board. [] Harvest cycle time is a) See chart .[] and check evaporator, water supply line, harvest water valve, long. -
Page 39: Removal And Replacement Of Components
V. Removal and Replacement of Components 1.Ensure all components, fasteners and thumbscrews are securely in place after the equipment is serviced. . The Polyol Ester (POE) oils used in R-404A units can absorb moisture quickly. Therefore it is important to prevent moisture from entering the system when replacing or servicing parts. -
Page 40: Evacuation And Recharge [R-404A]
Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the charge label inside the front panel on the icemaker or on the nameplate on the condensing unit. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used. -
Page 41: Condensing Unit
B. Condensing Unit 1. Removal and Replacement of Compressor 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. -
Page 42: Removal And Replacement Of Condenser
2. Removal and Replacement of Condenser 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. -
Page 43: Removal And Replacement Of Headmaster (Condensing Pressure Regulator - C
5) Disconnect the valve body. Remove the strainer and check valve. 6) Place the new valve and strainer in position. 7) Remove the drier, then place the new drier in position (located in the icemaker). Install the new drier with the arrow on the drier in the direction of the refrigerant flow. 8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. -
Page 44: Removal And Replacement Of Fan Motor
8) Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG. Always protect the headmaster body by using a damp cloth to prevent it from overheating. Do not braze with the headmaster body exceeding 50°F (11°C). 9) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles. -
Page 45: Removal And Replacement Of Expansion Valve
4) Remove the spray tubes and the insulation at the "U" shaped notch where the refrigeration tubing passes through the molded chassis. 5) Disconnect the evaporator tubing. 6) Remove the pop rivets securing the evaporator, then lift out the evaporator. 7) Install the new evaporator. -
Page 46: Removal And Replacement Of Hot Gas Valve And Liquid Line Valve
7) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. 1. Do not heat the wall of the machine. Place a steel barrier for protection. . Always protect the valve body by using a damp cloth to prevent the valve from overheating. -
Page 47: Removal And Replacement Of Pump Motor
8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG. Always protect the valve body by using a damp cloth to prevent the valve from overheating. Do not braze with the valve body exceeding 50°F (11°C). 9) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles. -
Page 48: Removal And Replacement Of Thermistor
6) Disconnect the terminals from the water valve. 7) Remove the bracket and water valve from the unit. 8) Install the new water valve and replace the removed parts in the reverse order of which they were removed. 9) Close the water supply line drain valve. 10) Open the water supply line shut-off valve. -
Page 49: Cleaning And Maintenance Instructions
1. Cleaning Procedure 1) Dilute fl. oz. (650 ml) of the recommended cleaner Hoshizaki "Scale Away" or "LIME-A-WAY" (Economics Laboratory, Inc.) with 4 gal. (15 l) of warm water. ) Remove all ice from the evaporator and the storage bin/dispenser unit. -
Page 50: Sanitizing Procedure - Following Cleaning Procedure
9) Remove the insulation panel by removing the thumbscrews, then pour the cleaning solution into the water tank. 10) Move the service switch to the "WASH" position. 11) Replace the insulation panel and the front panel in their correct positions. 1) Turn on the power supply and start the washing process. -
Page 51: Maintenance
10) Turn off the power supply. Remove the front panel. 11) Repeat the above steps 17) through 9) in "1. Cleaning Procedure" two times to rinse thoroughly. 1) Repeat the above steps 1) through 11) one more time. 13) Move the control switch to the "ICE" position. 14) Replace the front panel in its correct position. - Page 52 ) Move the control switch to the "OFF" position. Confirm that the service switch is in the "CIRC." position. 3) Remove the front insulation, front frame, right side panel, and control box cover. 4) Disconnect the thermistor from the K3 connector on the control board, and unplug the water pump connector at the water pump.
- Page 53 Harvest Water Valve Hose Harvest Water Valve Wash Valve Fill Water Valve Fill Water Valve Hose Drain Water Valve Float Switch Vent Hose Drain Hose Tee Suction Hose Fig. 5...
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