Related Manuals for Hoshizaki DKM-500BAJ
Summary of Contents for Hoshizaki DKM-500BAJ
- Page 1 Service Manual Crescent Cube Icemaker / Dispenser Models DKM-500BAJ DKM-500BWJ Number: 73212 hoshizakiamerica.com Issued: 6-16-2017...
- Page 2 Hoshizaki provides this manual primarily to assist qualified service technicians in the service of the appliance. Should the reader have any questions or concerns which have not been satisfactorily addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support Department for assistance. Phone: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056;...
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Page 3: Table Of Contents
IMPORTANT This manual should be read carefully before the appliance is serviced. Read the warnings and guidelines contained in this manual carefully as they provide essential information for the continued safe use, service, and maintenance of the appliance. Retain this manual for any further reference that may be necessary. CONTENTS Important Safety Information .................... - Page 4 VI. Preparing the Appliance for Periods of Non-Use ............43 VII. Disposal ......................... 45 VIII. Technical Information ....................46 A. Specification and Performance Data Sheets ............... 46 1. DKM-500BAJ ......................46 2. DKM-500BWJ ......................47 B. Wiring Diagram ......................48...
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Page 5: Important Safety Information
Important Safety Information Throughout this manual, notices appear to bring your attention to situations which could result in death, serious injury, damage to the appliance, or damage to property. WARNING Indicates a hazardous situation which could result in death or serious injury. - Page 6 WARNING, continued • Do not make any alterations to the appliance. Alterations could result in electric shock, injury, fire, or damage to the appliance. • The appliance is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
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Page 7: Construction And Water/Refrigeration Circuit Diagram
I. Construction and Water/Refrigeration Circuit Diagram A. Construction 1. Air-Cooled Models (BAJ) Mechanical Bin Control Bin Cover Wash Valve Hot Gas Valve Spray Tubes Inlet Water Valve Drain Valve Water Supply Expansion Valve Inlet Water Pump Float Switch Ice Cube Guide Agitator Shutter Chain... -
Page 8: Water-Cooled Models (Bwj)
2. Water-Cooled Models (BWJ) Mechanical Bin Control Bin Cover Wash Valve Hot Gas Valve Spray Tubes Inlet Water Valve Drain Valve Strainer Expansion Valve Water Supply Water Pump Inlet Float Switch Ice Cube Guide Agitator Shutter Chain Solenoid Assembly Dispense Switch Spout Extension Condenser... -
Page 9: Water/Refrigeration Circuit Diagram
B. Water/Refrigeration Circuit Diagram 1. Air-Cooled Models (BAJ) -
Page 10: Water-Cooled Models (Bwj)
2. Water-Cooled Models (BWJ) -
Page 11: Sequence Of Operation And Service Diagnosis
II. Sequence of Operation and Service Diagnosis A. Sequence of Operation Flow Chart... -
Page 12: Service Diagnosis
B. Service Diagnosis WARNING • The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire. • Risk of electric shock. Control switch in "OFF" position does not de-energize all loads Use extreme caution and exercise safe electrical practices. - Page 13 1. Diagnosis 3) Power On: Turn on the power supply, then move the control switch to the "ICE" position. A 5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn on. If yellow "BC OPEN" LED is on (indicating a full bin), check MBC. Move ice away from MBC actuator paddle.
- Page 14 5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp, HGV, X12, and X10 relays 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 3.9 kΩ...
- Page 15 5c) Initial Harvest Cycle Termination Diagnosis: When the harvest timer (S4 dip switch 1 & 2) terminates, harvest cycle terminates. If 1-min. fill cycle starts after harvest timer terminates, check that FS is clean and operating properly, see "II.E. Float Switch Check and Cleaning."...
- Page 16 d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV. If PM de-energizes once freeze begins or fails to energize after 10 sec. anti-slush, check for 115VAC at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB.
- Page 17 7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the first pump-out is determined by S4 dip switch 5. See the table below. Control Board Settings S4 Dip Switch Setting Pump-Out 1st Pump-Out Frequency No.
- Page 18 (2) For DV, X12 and X12 Relays; If PM is energized and DV is de-energized, confirm X10 relay is de-energized. If X10 relay is energized, check X11 contacts for sticking. Replace as needed. If X10 relay is de-energized and DV is de-energized, check for 115VAC at X10 terminal #1 (DBU) to neutral (W).
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Page 19: Control Board Check
C. 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. Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB while CB is beeping. -
Page 20: Bin Control Check
D. Bin Control Check 1. Mechanical Bin Control Check This appliance uses a lever-actuated proximity switch to control the ice level in the storage bin. No adjustment is required. To check MBC, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel, then move the control switch to the "OFF"... - Page 21 5) Remove the actuator paddle from the switch mount. See Fig. 2. 6) Wipe down MBC with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm water. Rinse the parts thoroughly with clean water.
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Page 22: Switches
E. Switches Two control switches are used to control operation. 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 23: Float Switch Check And Cleaning
F. Float Switch Check and Cleaning FS is used to determine that there is sufficient water in the water tank after the 1-min. fill cycle and after each harvest cycle. FS 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. -
Page 24: Float Switch Cleaning
6) Wipe down FS mounting bracktes, housing, shaft, float, and retainer rod with a mixture of 1 part Hoshizaki "Scale Away" and 25 parts warm water. Clean the inside of the vent hose with cleaning solution. Rinse the parts thoroughly with clean water. -
Page 25: Thermistor Check
G. Thermistor Check To check thermistor resistance, follow the steps below. 1) Turn off the power supply. 2) Remove the front panel. Disconnect the dispense solenoid wire harness and set front panel aside. Move the control switch to the "OFF" position. 3) Remove the control box cover. -
Page 26: Diagnostic Tables
H. Diagnostic Tables 1. No Ice Production No Ice Production - Possible Cause 1. Power Supply a) Off, blown fuse, or tripped breaker. b) Not within specifications. 3. Fuse (control box) a) Blown or tripped. 5. Control Switch a) In "OFF" or "SERVICE" position. b) Bad contacts. - Page 27 (drain valve, bypass valve) 2. Freeze-Up Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist. See the Hoshizaki America Technician's Pocket Guide or contact your local distributor for a copy of the freeze-up checklist. Freeze-Up - Possible Cause Harvest Cycle 1.
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Page 28: Low Ice Production
Freeze-Up - Possible Cause Freeze Cycle 1. Evaporator a) Scaled up. b) Damaged. 2. Spray Tubes and/or Spray a) Dirty. Guides b) Out of position. 3. Refrigerant Charge a) Low. 4. Control Board a) Freeze timer (S4 dip switch 9 & 10) set incorrectly. See "II.C. - Page 29 Low Ice Production - Possible Cause Long Freeze Cycle 1. Evaporator a) Scaled up, dirty. 2. Float Switch a) Scaled up, dirty. See "II.E. Float Switch Check b) Float sticking. and Cleaning" c) Defective switch. 3. Inlet Water Valve a) Leaking by. 4.
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Page 30: Controls And Adjustments
III. Controls and Adjustments • A Hoshizaki exclusive control board is employed in KM series appliances. • All models are pretested and factory adjusted. • For a control board check procedure, see "II.C. Control Board Check." NOTICE • Fragile, handle very carefully. -
Page 31: Control Board Layout
A. Control Board Layout "J" Control Board • Bin Control Switch Closed LED (green) • "OUTPUT TEST" Button • S4 Dip Switch • "ALARM RESET" Button (on continuously in (used to test relays on control board) thermostatic bin control application) •... -
Page 32: Led Lights And Audible Alarm Safeties
B. 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 "POWER OK" LED indicates proper control voltage and remains on unless a control voltage problem occurs. -
Page 33: Settings And Adjustments
Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. Keep in mind that setting the harvest timer to a longer setting decreases 24-hour production. -
Page 34: Pump-Out Timer (S4 Dip Switch 3 & 4)
3. Pump-Out Timer (S4 dip switch 3 & 4) NOTICE Do not adjust 3 off and 4 on. Drain valve does not energize in this setting. When a pump-out is called for, the pump motor stops for 2 sec. After 2 sec. the drain valve and pump motor energize. -
Page 35: Harvest Pump Time (S4 Dip Switch 6)
5. Harvest Pump Time (S4 dip switch 6) NOTICE Factory set for proper operation. Do not adjust. Adjustment outside of the factory default setting may result in damage to the appliance. The harvest pump time starts with 50 sec. left to go in the harvest time (S4 dip switches 1 &... -
Page 36: Factory Use (S4 Dip Switch 8)
In this case, see "II.G.3. Low Ice Production" for possible solutions. The freeze timer is factory set and no adjustment is required. Before changing this setting, contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations. -
Page 37: Minimum Harvest Time (S5 Dip Switch 4)
11. Minimum Harvest Time (S5 dip switch 4) NOTICE Factory set for proper operation. Do not adjust. Adjustment outside of the factory default setting may result in damage to the appliance. S5 Dip Switch Setting No. 4 Minimum Harvest Time 120 sec. -
Page 38: Refrigeration Circuit And Component Service Information
IV. Refrigeration Circuit and Component Service Information WARNING • 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"... - Page 39 2. Brazing WARNING • R-404A itself is not flammable at atmospheric pressure and temperatures up to 176°F (80°C). • 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.
- Page 40 Remember to loosen the connection and purge the air from the hose. For the required refrigerant charge, see the rating label inside the icemaker. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest edition) be used.
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Page 41: Component Service Information
• 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. -
Page 42: Maintenance
V. 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 •... -
Page 43: Preparing The Appliance For Periods Of Non-Use
VI. Preparing the Appliance for Periods of Non-Use NOTICE • When storing the appliance for an extended time or in sub-freezing temperatures, follow the instructions below to prevent damage. • To prevent damage to the water pump, do not operate the appliance with the control switch in the "WASH"... - Page 44 3. On water-cooled model, remove the water from the water-cooled condenser: 1) Make sure the power supply is off, then remove the front panel. Disconnect the dispense solenoid wire harness and set front panel aside. Remove the left side panel. 2) Close the condenser water supply line shut-off valve.
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Page 45: Disposal
VII. 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. -
Page 46: Technical Information
We reserve the right to make changes in specifications and design without prior notice. A. Specification and Performance Data Sheets Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be used for reference only. 1. DKM-500BAJ Specification Sheet AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 13.5 A ( 5 Min. -
Page 47: Dkm-500Bwj
2. DKM-500BWJ Specification Sheet AC SUPPLY VOLTAGE 115/60/1 AMPERAGE 12 A ( 5 Min. Freeze AT 104°F / WT 80°F) MINIMUM CIRCUIT AMPACITY 20 A MAXIMUM FUSE SIZE 20 A ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F ELECTRIC W (kWH/100 lbs.) 1000(4.79) 960(4.26) WATER gal./24HR (gal./100 lbs.) -
Page 48: Wiring Diagram
B. Wiring Diagram 1. DKM-500B_J...