Reliability is a beautiful thingTM SELF-CONTAINED CUBER (OPEN CELL TYPE) Model AM-50BAE AM-50BAE-AD SERVICE MANUAL NUMBER: 73126 ISSUED: December 22, 2004
IMPORTANT Only qualified service technicians should attempt to service or maintain this icemaker. No such service or maintenance should be undertaken until the technician has thoroughly read this Service Manual. HOSHIZAKI provides this manual primarily to assist qualified service technicians in the service and maintenance of the icemaker.
Please review this manual. It should be read carefully before the icemaker is serviced or maintenance operations 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. CONTENTS I. Specifications .................................................................................................................... 5 1. Dimensions/Connections ..................................................
. Timing Chart ............................................................................................................... 33 5. Performance Data ....................................................................................................... 34 [a] AM-50BAE .......................................................................................................... 34 [b] AM-50BAE-AD .................................................................................................... 35 VI.
I. Specifications 1.
[b] AM-50BAE-AD Units = mm 6 U1VA6060209
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[b] AM-50BAE-AD 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.
II. General Information 1.
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III. Installation and Operating Instructions 1. Checks Before Installation * Visually inspect the exterior of the shipping container and report any severe damage to the carrier. WARNING Remove shipping tape(s) and packing as follows. If any are left in the icemaker, it will not work properly. IMPORTANT 1. Remove shipping tape holding the door. 2. Ensure all components, fasteners and thumbscrews are securely in place. * Remove the package containing accessories. Remove shipping tape holding the separator.
3. Setup 1) Unpack the icemaker, and remove all shipping cartons, tapes and packing BEFORE operating the unit. Be careful not to damage the exterior panels when handling the icemaker. 2) Position the icemaker in a selected site. Clean the interior with soap and water and rinse thoroughly. 3) Level the icemaker in both the left-to-right and the front-to-rear directions. 4) The perimeter where the machine touches the floor should be sealed with silicone for sanitation.
4) To build into a corner: Mi Min. 34" 3) To build in between a unit and an open space: Cabinet n. 23 " Oven Icemaker 15" AM-50BAE Fig. 4 Cabinet Min. 32" Do not build in the icemaker in a corner where the door will hit other equipment such as an oven handle or where the icemaker cannot be pulled out for service. 15" AM-50BAE-AD Fig. 3 Use a cabinet or the like to support the counter before building in the icemaker. [b] Building in the Icemaker 1) Make water supply and drain connections.
Reversing the Door Hinges 1) Right-hinged door. Hinge (A) 2) a. Remove the hinge stop pin from hinge (B). b. Remove the door from hinge (A). Door b Body a Hinge (B) Hinge Stop Pin Top Panel 3) c. Remove the two screws securing the top panel. d. Remove hinge (A) and brace - top. e. Remove hinge (B).
Top Panel 4) f. Remove hinge (A) and brace - top from the body. Attach brace - top to body (right). Flip hinge (A) over as shown in the illustration below, and fasten to body (left). g. Turn the top panel 180°, hook its rear on the body, and secure its front with screws. h. Attach hinge (B) on the left. f - detail g Hinge (A) f Brace - Top Hinge (A) h Hinge (B) Slot Hinge (A) Body (Left) Body (Right) 5) i. Remove the handle from the front left and reattach it to the front right of the door.
7) Left-hinged door. 4. Electrical Connections WARNING THIS APPLIANCE MUST BE GROUNDED. This icemaker requires a ground that meets national and local electrical code requirements. To prevent possible severe electrical shock injury to individuals or extensive damage to equipment, install a proper ground wire to this icemaker. Remove the plug from the mains socket before any maintenance, repairs or cleaning is undertaken.
5. Water Supply and Drain Connections WARNING To prevent damage to the freezer mechanism, do not operate this icemaker when the water supply is OFF, or if the pressure is below the recommended minimum water pressure of 10 PSIG (0.7 bar). Stop the icemaker until proper water pressure is resumed. * Attach the brass fitting included in the accessory bag as shown in Fig. 5. The brass fitting size is 1/2" FPT and must be connected only to a potable water supply.
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8. Preparing the Icemaker for Long Storage WARNING Drain the icemaker to prevent damage to the water supply line at subfreezing temperatures, using air or carbon dioxide. Shut off the icemaker until proper air temperature is resumed. 1) Close the water supply line shut-off valve, and open the drain valve. 2) Move the control switch to the “OFF" position. 3) Blow out the water supply line and the internal water circuit.
IV. Cleaning and Maintenance IMPORTANT 1. Ensure all components, fasteners and thumbscrews are securely in place after any maintenance or cleaning is done to the equipment. 2. Wash your hands before removing ice. Use the scoop provided to remove ice. 3. Keep the scoop clean. Clean it by using a neutral cleaner at least once a day, and rinse thoroughly. 4. Close the bin door after removing ice to prevent entrance of dirt, dust or insects into the bin. 5.
[b] Cleaning Procedure The cleaning process will remove lime deposits from the water system. 1) Remove all ice from the evaporator and the storage bin. Note: To remove cubes on the evaporator, move the control switch to the “OFF" position and move it back to the “ICE" position after 3 minutes. The defrost cycle starts and the cubes will be removed from the evaporator. 2) Move the control switch to the “OFF" position. Close the water supply line shut-off valve.
10) Remove the water tank, drain it, and replace it as described in 3) through 6). 11) Open the water supply line shut-off valve. 12) Move the control switch to the “WASH" position to circulate clean water for about 5 minutes. 13) Move the control switch to the “OFF" position, then remove the water tank, drain it, and replace it as described in 3) through 6). 14) Repeat 12) and 13) three more times to rinse thoroughly. [c] Sanitizing Solution Dilute 0.5 fl. oz. (14.8 ml or 1 tbs) of 5.
Water Tank 6) Disconnect the suction tube by compressing both plastic tabs to unlock Suction Tube the joint in the direction of the black arrows and pulling the tube clear to drain the tank. Joint 7) Spread out the tabs on both sides to unlock the water tank, and pull it out toward you. Soak the water tank in the sanitizing solution for 10 minutes. Unlock Drain Unlock Frame Pipe 8) Lift off the ice chute from the front frame pipe and then from the rear frame pipe.
Bracket 12) Slide in the spray assembly along the rails on Frame Pipe the right and left brackets. Refit the discharge tube securely on the spray assembly. A loose Rail fitting may cause a water leak. Rail 13) Position and lock the ice chute onto the front and rear frame pipes by pushing the chute down until it clicks onto both pipes. 14) Slide in the water tank along the rails at the bottom of the right and left brackets until it clicks into place.
20) Mix a new batch of the sanitizing solution and slowly pour it into the water tank. 21) Move the control switch to the “WASH" position. 22) After circulating the sanitizing solution for about 15 minutes, move the control switch to the “OFF" position. Water Tank 23) Disconnect the suction tube by compressing Suction Tube both plastic tabs to unlock the joint in the direction of the black arrows and pulling the tube clear.
29) Move the control switch to the “WASH" position to circulate clean water for about 5 minutes. 30) Move the control switch to the “OFF" position, then remove the water tank, drain it, and replace it as described in 23) through 26). 31) Repeat 29) and 30) two more times to rinse thoroughly. 32) Move the control switch to the “ICE" position, and start the automatic icemaking process.
2. Maintenance IMPORTANT This icemaker must be maintained individually, referring to the instruction manual and labels provided with the icemaker. 1) Exterior To keep the exterior clean, wipe occasionally with a clean and soft cloth. Use a damp cloth containing a neutral cleaner to wipe off all oil or dirt build-up. 2) Condenser Check the condenser once a year, and clean if required by using a brush or vacuum cleaner. More frequent cleaning may be required depending on the location of the icemaker. 3.
V. Technical Information 1.
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3. Controls [a] Icemaking Control The freeze and defrost cycles are controlled by the combination of a thermistor and an electronic controller. When the evaporator cools down to a specific temperature (around +28°F (-2°C)), the thermistor attached to the evaporator senses the temperature and signals to the electronic controller.
[d] Before Checking the Electronic Controller Check the power source voltage and the thermistor as shown in the table below. Component Procedure Thermistor (on evaporator) Normal CAUTION Thermistor sensor part is fragile, glass sealed. Handle with care. Holder Screw Thermistor U1VA6060209 Evaporator * Disconnect the thermistor on the board. * Remove the screw and the thermistor holder on the evaporator. * Immerse the sensor part in a glass containing ice and water for 5 minutes.
[e] Adjustment at Part Replacement The thermistor and electronic controller are designed for optimum ice production. If adjustment is desired at part replacement, follow the instructions below. Electronic Controller Variable resistor for adjustment of freeze cycle completion temperature Fig. 8 Variable resistor for adjustment of defrost cycle completion temperature (Does not need adjustment) The variable resistor VR1 is for a fine adjustment of the defrost cycle completion temperature.
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[b] AM-50BAE-AD APPROXIMATE ICE PRODUCTION PER 24 HR. WATER TEMP. (ºF/ºC) AMBIENT TEMP. (ºF/ºC) 70/21 50/10 55 50 49 42 80/27 90/32 lbs./day kg./day APPROXIMATE ELECTRIC CONSUMPTION 100/38 80/27 100/38 30 28 27 24 70/21 80/27 90/32 gal./day m3/day FREEZING CYCLE TIME 100/38 90/32 100/38 70/21 80/27 90/32 min.
VI.
PROBLEM [6] Water will not be supplied CHECK a) Water Supply POSSIBLE CAUSE 1.
PROBLEM [11] Cloudy cubes CHECK a) Water Quality b) Nozzle c) Water System [12] Freeze cycle time is too a) Ambient temperature long b) Air Inlet / Outlet ( bottom front ) c) Thermistor d) Refrigerant Circuit POSSIBLE CAUSE 1. High hardness or contains impurities. 1. Clogged 2. Misaligned nozzle and water tank 1. Scaled up 2. Water leaks 1. Too high ( freeze cycle will be extremely long at more than 40°C ) 1. Blocked.
VII. Removal and Replacement of Components IMPORTANT Ensure all components, fasteners and thumbscrews are securely in place after the equipment is serviced. 1. Service for Refrigerant Lines [a] Service Information 1) Allowable Compressor Opening Time and Prevention of Lubricant Mixture [R134a] The compressor must not be opened more than 30 minutes in replacement or service.
6) Replacement Copper Tubing [R134a] The copper tubes currently in use are suitable for R134a. But do not use them if oily inside. The residual oil in copper tubes should be as little as possible. (Low residual oil type copper tubes are used in the shipped units.) 7) Evacuation, Vacuum Pump and Refrigerant Charge [R134a] Never allow the oil in the vacuum pump to flow backward. The vacuum level and vacuum pump may be the same as those for current refrigerants.
[c] Evacuation and Recharge 1) Attach charging hoses, a service manifold and a vacuum pump to the system. If possible, use quick release connectors onto the access valves (especially on the high side). 2) Turn on the vacuum pump. 3) Allow the vacuum pump to pull down to a 29.9” Hg (760 mm Hg) vacuum. Evacuating period depends on the pump capacity. 4) Close the low-side and high-side valves on the service manifold.
2. Compressor 1) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, louver and front panel. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1. [b] Refrigerant Recovery”). 4) Remove the terminal cover on the compressor, and disconnect solderless terminals. 5) Disconnect the discharge and suction pipes using brazing equipment. 6) Remove the hold-down bolts, washers and rubber grommets. 7) Slide and remove the compressor.
3. Drier 1) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, louver and front panel. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1.[b] Refrigerant Recovery”). 4) Remove the drier holder, if any, and pull the drier towards you for easy service. 5) Remove the drier using brazing equipment. 6) Braze or solder the new drier, with the arrow on the drier in the direction of the refrigerant flow.
4. 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) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, door, louver, top and front panels. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1.[b] Refrigerant Recovery”). 4) Remove the water tank assembly, referring to “IV.1.
5. Hot Gas Valve 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) Unplug the icemaker or disconnect the power source. 2) Remove the rear panel, louver and front panel. 3) Recover the refrigerant and store it in a proper container, if required by an applicable law (See “1.[b] Refrigerant Recovery”). 4) Disconnect the hot gas valve leads. 5) Remove the screw and the solenoid coil.
6. Pump Motor 1) Unplug the icemaker or disconnect the power source. 2) Remove the top panel, door and pipe cover (rear). 3) Disconnect the pump motor leads inside the pipe cover (rear). 4) Drain the water tank by compressing the plastic tabs on the suction tube to release the joint. 5) Spread the tabs on both sides of the water tank and pull it toward you. 6) Carefully remove the plastic housing by releasing the retaining screws. 7) Disconnect the pump suction and discharge tubings.
8. Water Valve 1) Close the water supply shut-off valve. 2) Unplug the icemaker or disconnect the power source. 3) Remove the door and top panel. 4) Disconnect the receptacle (leads) from the water valve. 5) Remove the valve outlet tubing. 6) Remove the water supply inlet and water valve by releasing the two retaining screws. 7) Install the new valve in the reverse order of the removal procedure. 8) Open the water supply shut-off valve. 9) Plug in the icemaker or connect the power source.
10. Thermistor for Cube Control 1) Unplug the icemaker or disconnect the power source. 2) Remove the top and front panels, door, louver, pipe cover (rear) and control box cover. 3) Remove the connectors on the controller board, referring to “9. Controller Board.” 4) Unscrew and remove the thermistor holder and thermistor, located on the evaporator. 5) Install the new thermistor in the reverse order of the removal procedure, by using a sealant (high-thermal conductive type). See Fig. 10.
11. Bin Control Thermostat 1) Unplug the icemaker or disconnect the power source. 2) Remove the top panel, door and pipe cover (rear). 3) Remove the thermostat holder from the storage bin, and disconnect the the bin control thermostat bulb. 4) Remove the bin control thermostat from the icemaker body (rear). 5) Cut off heater wires and splice new heater wires. 6) Install the new bin control thermostat in the reverse order of the removal procedure. 7) Refit the panels in their correct positions.
HOSHIZAKI HOSHIZAKI AMERICA, INC. 618 HIGHWAY 74 SOUTH PEACHTREE CITY, GA 30269 U.S.A.
