III. TECHNICAL INFORMATION ---------------------------------------------------------------------- 19 1. WATER CIRCUIT AND REFRIGERANT CIRCUIT ------------------------------------------ 19 2. WIRING DIAGRAM ---------------------------------------------------------------------------------- 20 3. TIMING CHART--------------------------------------------------------------------------------------- 21 KMD-210AB-HC ------------------------------------------------------------------------------------- 21 IV. SERVICE DIAGNOSIS ------------------------------------------------------------------------------ 22 1. 10-MINUTE DIAGNOSTIC PROCEDURE ----------------------------------------------------- 22 2. DIAGNOSTIC CHARTS ----------------------------------------------------------------------------- 24...
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4. DRIER --------------------------------------------------------------------------------------------------- 33 5. HOT GAS VALVE ------------------------------------------------------------------------------------ 34 6. EXPANSION VALVE -------------------------------------------------------------------------------- 35 7. EVAPORATOR ---------------------------------------------------------------------------------------- 36 8. WATER REGULATING VALVE – WATER-COOLED MODEL ONLY ------------------- 37 9. ADJUSTMENT OF WATER REGULATING VALVE – WATER-COOLED MODEL ONLY ----------------------------------------------------------------------------------------- 38 10.
II. GENERAL INFORMATION 1. CONSTRUCTION Water Supply Tube Drain Valve Water Supply Inlet Spray Guide Hot Gas Valve Spray Tube Condenser Thermistor Expansion Valve Fan Motor Compressor Cube Guide Water Tank Pump Motor Control Box Float Switch Harvest Water Valve Fill Water Valve Control Switch Service Switch...
(LED 9 is on when FWV is open). When the refill counter is activated, the refill will last until UF/S closes or for 60 seconds, whichever is shorter. After UF/S closes, FWV closes 3 seconds later. KMD-210AB-HC refills 1 time. After the refill, the freeze continues until LF/S opens again and terminates ice production.
[e] NORMAL HARVEST CYCLE LEDs 5, 6, and 8 are on. Comp continues to run, HGV remains open and HWV opens. As the evaporator warms, the thermistor reaches 9°C. The control board then receives the thermistor’s 3.9kΩ signal and starts the harvest timer. HWV is open during harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 &...
3. CONTROL BOARD * A HOSHIZAKI exclusive solid-state control is employed in KMD-210AB-HC Crescent Cuber. * All models are pretested and factory-adjusted. CAUTION 1. Fragile, handle very carefully. 2. A control board contains integrated circuits, which are susceptible to failure due to static discharge.
[a] CONTROL BOARD LAYOUT #4 Harvest Water Valve #5 Freeze Water Valve #1, 2, 3 Float Switch Control Board Model KMD-210AB-HC P01771-02 Part Number P01771-02 Type HKM2006V003...
[b] 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 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), 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.
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f) LED Lights and Audible Alarm Safeties The control board includes LED indicator lights, audible alarm safeties, and an output test feature. The "POWER OK" LED indicates control voltage and will remain on unless a control voltage problem occurs. The “POWER OK” LED flashes continuously when the bin is full and DV energizes for a maximum of 5 minutes to drain the water tank.
[c] CONTROLS AND ADJUSTMENTS a) Default Dip Switch Settings The dip switch is factory-adjusted to the following positions: S1 Dip Switch No. KMD-210AB-HC S2 Dip Switch * Functions of S2 dip switch nos. 2 through 6 depend on program version.
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c) Drain Timer (S1 dip switch 3 & 4) Once every ten freeze cycles, the drain valve opens to drain the water tank for the time determined by the drain timer. These switches also determine the time to delay completion of a harvest cycle, i.e.
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Do not adjust. This must be left in the factory default position or the unit will not operate properly. It is deactivated on the KMD-210AB-HC. When activated, this control promotes harvest of ice on the evaporator that is hard to remove.
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Do not adjust. This must be left in the factory default position or the unit will not operate properly. It is deactivated on the KMD-210AB-HC. When activated, this control determines whether ice remains on the evaporator at the end of a harvest cycle and at the beginning of a freeze cycle.
l) Anti-Slush Control (S2 dip switch 6) Do not adjust. This must be left in the factory default position or the unit will not operate properly. When activated (Ver. 1.1), the thermistor located on the suction line checks for a 41°F (5°C) temperature as the evaporator cools.
4. HARVEST CONTROL – THERMISTOR A thermistor (semiconductor) is used as a harvest control sensor, anti-slush sensor, and overfreeze sensor. The resistance varies depending on the suction line temperatures. The thermistor detects the temperature of the evaporator outlet to start the harvest timer, to momentarily stop the pump motor during the freeze cycle, or to extend the harvest cycle time.
5. FLOAT SWITCH [a] EXPLANATION OF OPERATION The float operates 2 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.
6. 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. [a] EXPLANATION OF OPERATION The bin control is connected to the K1 connector (pins 4 & 5) on the control board. When the bin control is calling for ice (proximity switch closed;...
1) “DRAIN” KMD-210AB-HC employs the pump-out drain system. When the service switch is active and placed in the lower position, power is supplied to the pump motor and drain valve.
IV. SERVICE DIAGNOSIS 1. 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 21°C or warmer air and 10°C or warmer water temperatures.
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a. Lower Float Switch 1st Activation: Refill – The refill can occur at any time during the freeze cycle (1 refill per cycle). As ice builds the water level drops in the reservoir and the lower float switch activates (opens). LED 5 comes on and the control board energizes the fill water valve.
2. DIAGNOSTIC CHARTS [a] NO ICE PRODUCTION PROBLEM POSSIBLE CAUSE REMEDY [1] The icemaker will a) Power Supply 1. Off, blown fuse, or 1. Turn on, replace, or not start. tripped breaker. reset. 2. Loose connection. 2. Tighten. 3. Bad contacts. 3.
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PROBLEM POSSIBLE CAUSE REMEDY [1] The icemaker will k) Harvest Water Valve 1. Mesh filter or orifice gets 1. Clean not start. clogged and water (continued) supply cycle does not finish. 2. Coil winding opened. 2. Replace. 3. Wiring to water valve. 3.
PROBLEM POSSIBLE CAUSE REMEDY [6] Freeze cycle time a) Drain Valve 1. Leaking by. 1. Clean or replace. is too short. b) Float Switch 1. Dirty or erratic operation. 1. Clean or replace. c) Control Board 1. Defective. 1. See "II. 3. [d] Control Board Check Procedure."...
PROBLEM POSSIBLE CAUSE REMEDY [2] All ice formed on a) Evaporator 1. Scaled up. 1. Clean. evaporator does b) Water Supply Line 1. Water pressure too low. 1. Check and get not fall into bin in recommended harvest cycle. pressure. c) Water Filter System 1.
PROBLEM POSSIBLE CAUSE REMEDY [2] Harvest cycle a) See chart [b] [2] and check evaporator, water supply line, harvest water valve, time is long. ambient and/or water temperature, line valve (if applicable), thermistor, control board, and hot gas valve. [d] ABNORMAL ICE PROBLEM POSSIBLE CAUSE REMEDY...
V. REMOVAL AND REPLACEMENT WARNING Only trained service engineer can service the R290 refrigeration unit. 1. SERVICE FOR REFRIGERANT LINES [a] SERVICE INFORMATION 1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R290] The compressor must not be opened more than 30 minutes in replacement or service. Do not mix lubricants of different compressors even if both are charged with the same refrigerant, except when they use the same lubricant.
7) Evacuation, Vacuum Pump and Refrigerant Charge [R290] Never allow the oil in the vacuum pump to flow backward. The vacuum level and vacuum pump may be the same as those for the current refrigerants. However, the rubber hose and gauge manifold to be used for evacuation and refrigerant charge should be exclusively for R290.
4) Close the low-side and high-side valves on the service manifold. 5) Disconnect the vacuum pump, and attach a refrigerant charging cylinder to accurately weigh in the liquid charge. Remember to purge any air from the charging hose. See the nameplate for the required refrigerant charge.
WARNING Remove the R290 refrigerant from the unit in an area well-ventilated and free from open flames. Note: 1. Attach an access valve for recharging the unit charged by a lock ring. 2. All brazing connections inside the bin are clear coated. Sandpaper the brazing connections before unbrazing the components.
15) Connect the terminals and replace the terminal cover in its correct position. 16) Replace the panels and water tank in their correct positions. 17) Turn on the power supply. Note: Hoshizaki recommends that compressor starting electrics are always replaced at the same time as the compressor. 4. DRIER IMPORTANT Always install a new drier every time the sealed refrigeration system is opened.
5. HOT GAS VALVE CAUTION To ensure optimum performance, use a copper tube of the same diameter and length for replacement of the hot gas circuit. IMPORTANT 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.
6. EXPANSION VALVE IMPORTANT The water in the refrigeration circuit may exceed the capacity of the drier and freeze in the expansion valve. 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.
7. EVAPORATOR IMPORTANT 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. 1) Turn off the power supply. 2) Remove the panels and the front and top insulation. 3) Remove the refrigerant from the unit and then any residual refrigerant still existing in the unit to allow welding process.
8. WATER REGULATING VALVE – WATER-COOLED MODEL ONLY IMPORTANT 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. 1) Turn off the power supply. 2) Remove the panels.
19) Turn on the power supply. 9. 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.
Screw Screw (Remove) (Loosen) Screw Fan Motor Fan Motor Bracket Fan Blade Cover 11. PUMP MOTOR 1) Turn off the power supply. 2) Remove the panels and front insulation. 3) Disconnect the connector of the pump motor lead. 4) Remove the thumbscrew securing the pump motor. 5) Remove the hose band connecting the discharge hose.
7) Remove the hose band connecting the discharge outlet and pull off the rubber hose. 8) Install the new motor in the reverse order of the removal procedure. 9) Replace the panels and front insulation in their correct positions. 10) Turn on the power supply. 12.
7) Remove the two mounting screws. 8) Install the new valve in the reverse order of the removal procedure. 9) Open the water supply tap. 10) Plug in the icemaker or connect the power source. 11) Check for leaks. 12) Refit the panels in their correct positions. 14.
9) Install the new water tank in the reverse order of the removal procedure. 10) Refit the panels in their correct positions. 11) Turn on the power supply. 15. FLOAT SWITCH 1) Remove the pump motor bracket. See "V. 14. WATER TANK." 2) Pull up the pump motor bracket from the water tank.
4) Remove the two mounting screws, and release the Screws float switch from the tabs on the bracket. Float Switch 5) Install the new float switch in the reverse order of the removal procedure. Packing 6) Refit the panels in their correct positions. Bracket 7) Turn on the power supply.
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7) While pulling up the bin control lead, hook the bin control on the right side interior wall. Then push the bin control up against the bottom of the unit, and slide to the back until it snaps in place. Make sure the slotted holes at the right side of the bin control are securely placed on the collars at the bottom of the unit.
11) Secure the pump motor bracket with the two thumbscrews. 12) Reconnect the pump motor connector and float switch connector. 13) Replace the front insulation and front panel in their correct positions. 14) Turn on the power supply. 17. THERMISTOR 1) Turn off the power supply.
18. CONTROL BOX 1) Turn off the power supply. 2) Remove the front panel. 3) Remove the one mounting screw, and pull the control box cover. 4) Remove the two mounting screws, and pivot the control box to the left side slightly and pull the control box towards you if needed.
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Screws Control Box Cover Screw Control Box Note: After replacing the components inside the control box, connect and tie the wires properly in their correct position. Especially make sure that the harness does not press the push buttons on the control board. Control Switch Control Board Service Switch...
[a] CONTROL & SERVICE SWITCH 1) Disconnect the tab terminals and remove the nut securing the power switch. 2) Install the new switch in the reverse order of the removal procedure. 3) To prevent miswiring, check the terminal numbers and lead wire colors with the wiring label.
[g] STARTER 1) Disconnect the terminals, remove the mounting screw. 2) Install the new starter in the reverse order of the removal procedure. 3) To prevent miswiring, check the terminal numbers and lead wire colors with the wiring label. [h] RUN CAPACITOR 1) Disconnect the terminals on the starter and remove the nut securing the run capacitor.
19. SPRAY TUBE, WATER SUPPLY TUBE, SPRAY GUIDE 1) Turn off the power supply. 2) Remove the panels and front insulation. 3) Remove the hose band connecting the hose. 4) Push the tabs on both sides of the spray tube to release the spray tube. 5) Pull the spray tube towards you.
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Spray Guide 11) Refit the removed parts in the reverse order of the removal procedure. Check for water leaks. IMPORTANT Fit the spray guide securely and tightly on the evaporator fin. Otherwise, cloudy or irregular ice cubes or performance reduction may be caused.
[a] CLEANING PROCEDURE 1) Dilute approximately 9.5 fl. oz. (281 ml) of recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY” (Economics Laboratory, Inc.) with 1.8 gallon (6.8 lit.) of water. 2) Remove all ice from the evaporator and the storage bin/dispenser unit.
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8) In bad or severe water conditions, clean the float switch as described below. Otherwise, continue to step 9. a. Loosen the two thumbscrews securing the pump motor bracket. b. Disconnect the discharge hose. c. Disconnect the pump motor connector and the float switch connector from the side of the control box.
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h. Replace the float switch in its correct position. i. Replace the removed parts in the reverse order of which they were removed. 9) Pour the cleaning solution into the water tank. 10) Move the service switch to the "WASH" position. 11) Replace the front insulation and the front panel in their correct positions.
32) Repeat steps 18 through 31 three more times to rinse thoroughly. Note: If you do not sanitize the icemaker, go to step 14 in "SANITIZING PROCEDURE." [b] SANITIZING PROCEDURE – FOLLOWING CLEANING PROCEDURE 1) Dilute a 5.25% sodium hypochlorite solution (chlorine bleach) with water (add approximately 0.9 fl.
2. MAINTENANCE IMPORTANT This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. [a] STAINLESS STEEL EXTERIOR To prevent corrosion, wipe the exterior occasionally with a clean, soft cloth. Use a damp cloth containing a neutral cleaner to wipe off oil or dirt build up. [b] STORAGE BIN AND SCOOP * Wash your hands before removing ice.
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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.
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3. Drain the water tank: 1) Turn off the power supply and remove the front panel. 2) Move the control switch to the "SERVICE" position and move the service switch to the "DRAIN" position. 3) Replace the front panel in its correct position and turn on the power supply for 2 minutes. 4) Turn off the power supply and remove the front panel.
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