Hoshizaki Hoshizaki America, Inc. Modular Crescent Cuber Serenity Series Model KMS-830MLH Including Condensing Unit Models SRK-8H/3 “A Superior Degree of Reliability” SERVICE MANUAL www.hoshizaki.
IMPORTANT Only qualified service technicians should install, service, and maintain the 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, component life, and warranty coverage. Hoshizaki provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker.
IMPORTANT This manual should be read carefully before the icemaker is serviced or maintenance operations are performed. Only qualified service technicians should install, service, and maintain the icemaker. Read the warnings contained in this booklet carefully as they give important information regarding safety. Please retain this booklet for any further reference that may be necessary. CONTENTS Important Safety Information....................................................................................
IV. Service Diagnosis........................................................................................................... 28 A. Diagnostic Procedure .................................................................................................. 28 B. Control Board Check.................................................................................................... 32 C. Bin Control Check and Cleaning.................................................................................. 33 1.
Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, or damage to the unit. WARNING Indicates a hazardous situation which could result in death or serious injury. NOTICE Indicates a situation which could result in damage to the unit or property. IMPORTANT Indicates important information about the use and care of the unit.
For SRK • Electrical connection must be hard-wired and must meet national, state, and local electrical code requirements. Failure to meet these code requirements could result in death, electric shock, serious injury, fire, or severe damage to equipment. • The remote condensing unit requires an independent power supply of proper capacity. See the nameplate for electrical specifications. Failure to use a properly sized breaker or fuse can result in a tripped breaker, blown fuses, or damage to existing wiring.
I. Specifications A. Icemaker 1. KMS-830MLH with SRK-8H AC SUPPLY VOLTAGE APPROXIMATE ICE PRODUCTION PER 24 HR. lb./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE ELECTRIC & WATER CONSUMPTION KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) WATER gal./24HR (gal./100 lb.
2. KMS-830MLH with SRK-8H3 AC SUPPLY VOLTAGE APPROXIMATE ICE PRODUCTION PER 24 HR. lb./day ( kg/day ) Reference without *marks SHAPE OF ICE ICE PRODUCTION PER CYCLE ELECTRIC & WATER CONSUMPTION KMS/SRK COMBINED ELECTRIC W (kWH/100 lb.) WATER gal./24HR (gal./100 lb.
B. Condensing Unit 1. SRK-8H AC SUPPLY VOLTAGE 208-230/60/1 (3 wire with neutral for 115VAC) (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 9.1 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 33.6"x23"x22.1" (854x585x562 mm) DIMENSIONS INCLUDING LEGS (WxDxH) 35.7"x25.4"x37.1" (907x645x942 mm) EXTERIOR FINISH Galvanized steel WEIGHT Net 176 lb.
2. SRK-8H3 AC SUPPLY VOLTAGE 208-230/60/3 (115VAC Supplied to KMS via Factory Wire Harness) AMPERAGE 7.5 A ( 5 Min. Freeze AT 104°F / WT 80°F ) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A EXTERIOR DIMENSIONS (WxDxH) 33.6"x23"x22.1" (854x585x562 mm) DIMENSIONS INCLUDING LEGS (WxDxH) 35.7"x25.4"x37.1" (907x645x942 mm) EXTERIOR FINISH Galvanized steel WEIGHT Net 176 lb. (80 kg) CONNECTIONS - ELECTRIC Main Power Supply: Permanent Connection Shipping 206 lb.
II. General Information A. Construction 1.
2. Condensing Unit Top Panel Right Side Panel Hot Gas Valve Liquid Line Valve Condenser Fan Motor Compressor) Condenser Headmaster (C.P.R.
B. Sequence of Operation 1. Sequence Cycles and Shutdown The steps in the sequence are as outlined below. When power is supplied, CB red "POWER OK" LED and CB green "BC CLOSED" LED turns on. If CB yellow "BC OPEN" LED is on, the unit will not start. In this case, clear ice away from the BC actuator paddle in the dispenser unit/storage bin area. A 5-second delay occurs at startup. Note that the order of the green sequence LEDs from the outer edge of CB is 1, 4, 3, 2. a) 1-Minute Fill Cycle LED 4 is on.
d) Pump-Out Cycle LEDs 1, 3, and 2 are on. LED 4 is on when S4 dip switch 3 & 4 are set to 3 off and 4 on. For details, see "II.C.3.c) Pump-Out Timer (S4 dip switch 3 & 4)." NOTICE! Do not adjust S4 dip switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this model prevents the pump motor from rotating in the pump-out (reverse) direction. Comp and FMR remain energized, HGVs energize. LLVs de‑energize. PM de-energizes for 2 seconds, then energizes in reverse direction for 10 seconds.
PM energized WV de-energized WV continues Comp energized Thermistor temperature FMR energized reaches 48°F (9°C) HGVs energized (3.9 kΩ or less). Harvest timer starts. F/S closed F/S open F/S check Harvest Pump Timer 50 sec. • WV time: 6 min. or the length of harvest minus 50 sec. (S4 dip switch 7), whichever is shorter. DO NOT ADJUST S4 dip switch 7. • Maximum harvest time: 20 min. Thermistor 1 to 3-min. timer in control in control (S4 dip switch 1 & 2) 2.
C. Control Board • A Hoshizaki exclusive solid-state control board is employed in Hoshizaki Crescent Cubers. • All models are pretested and factory set. • For a control board check procedure, see "IV.B. Control Board Check." NOTICE 1. The control board is fragile; handle very carefully. 2. The control board contains integrated circuits, which are susceptible to failure due to static discharge. It is especially important to touch the metal part of the unit before handling or replacing the control board. 3.
1. Control Board Layout "G" Control Board • "ALARM RESET" Button • S4 Dip Switch • Bin Control Switch Closed LED (green) • "OUTPUT TEST" Button (used to test relays on control board) • K3 Connector (white) Harvest Control (thermistor) • Bin Control Switch Open LED (yellow) • K4 Connector (red) Bin Control • Alarm Buzzer • Part Number • S5 Dip Switch • Power LED (red) (lights when 10.
2. LED Lights and Audible Alarm Safeties At startup, a 5-second delay occurs while the control board conducts an internal timer check. A beep occurs when the control switch is moved to the "ICE" position. The red LED indicates proper control voltage and remains on unless a control voltage problem occurs. The green LEDs 1 through 4 energize and sequence from initial startup as listed in the table below. Note that the order of the LEDs from the outer edge of the control board is 1, 4, 3, 2.
3. Controls and Adjustments NOTICE Dip switches are factory set. Failure to maintain factory settings may adversely affect performance and warranty coverage. For more information, contact Hoshizaki Technical Support at 1-800-233-1940. a) Default Dip Switch Settings The dip switches are factory set to the following positions: S4 Dip Switch S4 Dip Switch No. Model 1 2 3 4 5 6 7 8 9 10 KMS-830MLH OFF OFF OFF OFF ON ON ON OFF OFF OFF S5 Dip Switch (Do Not Adjust) S5 Dip Switch No.
c) Pump-Out Timer (S4 dip switch 3 & 4) NOTICE Do not adjust S4 dip switch 3 & 4 to 3 off and 4 on. Otherwise, pump motor does not rotate in the pump‑out direction. When a pump-out is called for, the pump motor de-energizes for 2 seconds, then energizes for 10/20 seconds in reverse direction. Water is removed from the bottom of the water tank and sent down the drain through the check valve. At the same time, water flows through the small F/S tube to power flush F/S.
e) Harvest Pump Timer (S4 dip switch 7) NOTICE Factory set. Do not adjust. Adjustment outside of the factory default setting may result in damage to the icemaker. When S4 dip switch 7 is in the on position, the pump motor energizes and runs the last 50 seconds of the harvest cycle. The control board K1 connector pin #5 (DBU wire) is used to energize the pump motor for the harvest pump timer (forward rotation) and pump-out cycle (reverse rotation).
h) Float Switch Control (S5 dip switch 1) NOTICE Factory set. Do not adjust. Otherwise, the unit will not operate correctly. S5 dip switch 1 allows for single or double float switch applications. The KMS‑830MLH uses a single float switch. S5 Dip Switch Setting Single or Double Float Switch Application No. 1 OFF Single ON Double i) Refill Counter (S5 dip switch 2 through 5) NOTICE Factory set. Do not adjust. Otherwise, the unit will not operate correctly.
Reverse Direction for Pump-Out Pump-Out Check Valve Drain Distributor Thermistor Drier Thermostatic Expansion Valve Accumulator Hot Gas Valve Strainer Low Side Service Valves Suction Line Liquid Line Receiver Compressor Discharge Line Suction Line Fan SRK-8H/3 Strainer Liquid Line Valve High Side Service Valves Check Valve Liquid Line Valve Float Switch Cleaning Valve Inlet Water Valve Water Supply Pump Motor Forward Direction for Freeze/Harvest Pump Timer Water tank Evapora
426±22 0 PSIG 341±22 PSIG Cut-out Cut-in * High Pressure Switch * 266°F±9°F (130°C±5°C) 239°F±9°F (115°C±5°C) Cut-out Cut-in ** Discharge Line Thermostat ** Transformer Output 10.5V at 115V 5VDC B. Wiring Diagram 1.
426± 0 PSIG 341±22 PSIG Cut-in 22 Cut-out * High Pressure Switch * 266°F±9°F (130°C±5°C) 239°F±9°F (115°C±5°C) Cut-out Cut-in ** Discharge Line Thermostat ** Transformer Output 10.5V at 115V 5VDC 2.
C. Performance Data 1. KMS-830MLH with SRK-8H APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day m3/day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG 2 kg/cm G SUCTION PRESSURE PSIG kg/cm2G 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 50/10 820 793 372 360 785 776 356 352 WATER TEMP.
2. KMS-830MLH with SRK-8H3 APPROXIMATE ICE PRODUCTION PER 24 HR. lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION watts APPROXIMATE WATER CONSUMPTION PER 24 HR. gal./day m3/day FREEZING CYCLE TIME min. HARVEST CYCLE TIME min. HEAD PRESSURE PSIG kg/cm2G SUCTION PRESSURE PSIG kg/cm2G 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 50/10 791 768 359 349 761 748 345 339 WATER TEMP.
IV. Service Diagnosis WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Risk of electric shock. Use extreme caution and exercise safe electrical practices. 3. Moving parts (e.g., fan blade) can crush and cut. Keep hands clear. 4. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the unit is serviced. Make sure that none have fallen into the storage bin.
4) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay remain energized, Comp, FMR, HGVs, and X10 relay energize. CB monitors the warming of the evaporator via the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the harvest timer (S4 dip switch 1 & 2). For details, see "II.C.3.b) Harvest Timer (S4 dip switch 1 & 2).
5) Freeze Cycle – LED 1 is on. Comp, FMR, and PM remain energized (PM power supply switches from CB K1 connector pin #5 (DBU wire) to CB K1 connector pin #4 (R wire). LLVs energize. HGVs and X10 relay de-energize. CB 5-minute short cycle protection timer prevents CB from monitoring F/S for the first 5 minutes of freeze. After the 5-minute short cycle protection timer terminates, CB turns freeze termination over to F/S. Diagnosis: Check that Comp, FMR, and PM remain energized.
During the pump-out cycle, PM is energized from CB K1 connector pin #5 (DBU wire) through X10 relay terminal #6 and terminal #2. This allows for PM reverse rotation and water flow to pump-out check valve. Diagnosis: Check that PM stops for 2 seconds, then restarts. Confirm X10 relay is de-energized and water is flowing through the pump‑out check valve and not over the evaporator. If PM does not restart, check for 115VAC at CB K1 connector pin #5 (DBU wire) to a neutral (W wire).
B. Control Board Check Before replacing CB 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. Always choose a neutral (W wire) to establish a good neutral connection when checking voltages. Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while CB is beeping. WARNING! Risk of electric shock. Care should be taken not to touch live terminals.
C. Bin Control Check and Cleaning This unit uses a BC with a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. BC is connected to CB K4 (red) connector. When calling for ice, BC proximity switch is closed (green "BC CLOSED" LED on). When BC actuator paddle is engaged, BC proximity switch is open (yellow "BC OPEN" LED on) and CB shuts down the unit according to the chart below.
13) If BC assembly was removed, replace BC assembly in its correct position. 14) Replace the control box cover in its correct position. 15) Replace the panels in their correct positions. 16) Turn on the power supply to start the automatic icemaking process. Legend: BC–bin control; CB–control board Bin Control Insulation Bin Control Cover Bin Control Extension Bracket Bin Control Fig.
2. Bin Control Cleaning Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In this case, BC should be cleaned. 1) Turn off the power supply and clear any ice away from BC. 2) Remove the front and top panels, then move the control switch to the "OFF" position. 3) Remove the control box cover. 4) Disconnect BC connector from CB K4 (red) connector. 5) Remove BC insulation. Remove BC cover thumbscrews, then lift BC assembly out of the icemaker. See Fig. 3.
D. Float Switch Check and Cleaning F/S is used to determine that there is sufficient water in the water tank after the 1‑minute fill cycle and after each harvest cycle. F/S is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle. No adjustment is required. 1. Float Switch Check To check F/S, follow the steps below. Distributor 1) Turn off the power supply.
19) Disconnect F/S connector from CB K5 (black) connector. 20) Check for continuity across F/S leads. With the water tank full, F/S should be closed. If F/S is closed and the icemaker will not switch from the 1-minute fill cycle to the initial harvest cycle, replace CB. 21) If open, confirm that the water tank is full. If the water tank is not full, check the water supply, water filters, and inlet water valve. If the water tank is full, follow the steps in "IV.D.2. Float Switch Cleaning.
13) Replace the insulation panel, then replace the left side, top, and front panels in their correct positions. 14) Turn on the power supply to start the automatic icemaking process. Legend: CB–control board; F/S–float switch E. Thermistor Check To check thermistor resistance, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF" position. 3) Remove the control box cover. 4) Remove the thermistor.
F. Diagnostic Charts Before consulting the diagnostic charts, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board Check." Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10, and S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a) Default Dip Switch Settings.
No Ice Production - Possible Cause 14. Inlet Water Valve a) Screen or orifice clogged. b) Coil winding open. c) Open in freeze cycle. 15. Float Switch See "IV.D. Float Switch Check and Cleaning" a) Float does not move freely. 16. Compressor a) Compressor relay/magnetic contactor contacts bad or coil winding open. b) Defective. b) Start capacitor or run capacitor defective (single phase only). c) Internal overload protector open. d) Start relay contacts bad or coil winding open (single phase only).
Freeze-Up - Possible Cause 3. Spray Tubes and/or Spray Guides a) Dirty. 4. Water Supply a) Low water pressure. b) Out of position. b) External water filters clogged. c) Insufficient water line size. Minimum 1/4" nominal ID copper water tubing or equivalent. 5. Inlet Water Valve a) Screen or orifice clogged. b) Defective. 6. Float Switch See "IV.D. Float Switch Check and Cleaning" a) Dirty, sticking. 7. Refrigerant Charge a) Low. 8. Control Board See "II.C.3. Controls and Adjustments" and "IV.B.
3. Low Ice Production Low Ice Production - Possible Cause Long Harvest Cycle 1. Evaporator a) Scaled up. 2. Spray Tubes and/or Spray Guides a) Dirty. 3. Refrigerant Charge a) Low. 4. Water Supply a) Low water pressure. b) Out of position. b) External water filters clogged. c) Insufficient water line size. Minimum 1/4" nominal ID copper water tubing or equivalent. d) Too cold. 5. Control Board a) Thermistor connection loose (K3). See "IV.B. Control Board Check" b) Defective. 6. Thermistor See "IV.E.
V. Replacement of Components WARNING 1. This unit should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. 2. Move the control switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power from being turned back on inadvertently. 3. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the unit is serviced.
2. Brazing WARNING 1. R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). 2. R-404A itself is not explosive or poisonous. However, when exposed to high temperatures (open flames), R-404A can be decomposed to form hydrofluoric acid and carbonyl fluoride both of which are hazardous. 3. Do not use silver alloy or copper alloy containing arsenic. 4. Use an electronic leak detector or soap bubbles to check for leaks.
4) Close the low-side valve and high-side valve on the gauge manifold. 5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a refrigerant service cylinder. Remember to loosen the connection and purge the air from the hose. See the nameplate on the SRK for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.
B. Important Notes for Component Replacement NOTICE When replacing a component listed below, see the notes to help ensure proper operation. Component Compressor Notes Install a new start capacitor, run capacitor, and start relay. Expansion Valve • Attach the expansion valve bulb to the suction line in the same location as the previous bulb. • The bulb should be between the 10 and 2 o'clock positions on the tube. • Secure the bulb with the clamp and holder, then insulate it.
VI. Cleaning and Maintenance This icemaker must be cleaned and maintained in accordance with the instruction manual and labels provided with the icemaker. Consult with your local distributor about cleaning and maintenance service. To obtain the name and phone number of your local distributor, visit www.hoshizaki.com or call Hoshizaki Technical Support at 1‑800‑233‑1940 in the USA. WARNING 1. Only qualified service technicians should attempt to service this icemaker. 2.
1. Cleaning Procedure 1) Dilute 13.5 fl. oz. (400 ml) of Hoshizaki "Scale Away" with 2.5 gal. (9.5 l) of warm water. 2) Remove all ice from the evaporator and the dispenser unit/storage bin. Note: To remove cubes on the evaporator, turn off the power supply and turn it back on after 3 minutes. The harvest cycle starts and the cubes will be removed from the evaporator. 3) Turn off the power supply. 4) Remove the front, top, and left side panels, then remove the insulation panel.
9) In bad or severe water conditions, clean the float switch as described below. Otherwise, continue to step 10. a. Disconnect the vent tube and the flush tube from the top of the float switch housing, then remove the float switch assembly. Remove the rubber boot from the bottom of the assembly. b. Remove the retainer rod from the bottom of the float switch housing, then remove the float. Be careful not to bend the retainer rod excessively when removing it. c.
30) Disconnect the distributor from the distribution hose. Remove the thumbscrew securing cube guide B. Remove cube guide B, then remove cube guide A. Remove the overflow cap and overflow pipe. 31) Remove the drain plug. Allow the water tank to drain, then replace the drain plug in its correct position. Be careful not to cross thread it. 32) Replace the overflow pipe, overflow cap, cube guide A, and cube guide B in their correct positions. Be careful not to cross thread the overflow pipe.
B. Maintenance This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. WARNING 1. Only qualified service technicians should attempt to service this icemaker. 2. Move the control switch to the "OFF" position and turn off the power supply to the SRK condensing unit before servicing the KMS or SRK. Place the KMS disconnect (if applicable) in the off position. Lockout/Tagout to prevent the power supply from being turned back on inadvertently. 1.
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. 2. Drain the water tank: 1) Turn off the power supply. 2) Remove the front, top, and left side panels, then remove the insulation panel.
