CU1526, CU2026, CU3030 Service Manual Introduction The design of this cuber is the result of years of experience and testing. Standard features include a removable bin for service and an on-off switch at the front of the cabinet for easy operational control. Table of Contents Installation: Product Specifications . . . . . Page 2 Cleaning, Sanitation and Maintenance . . . Page 32 Model Number Description. . . . . . . . . . Page 3 Test Procedures - Sensors . . . . . . . . . Page 34 Water . . . . . . . .
CU1526, CU2026, CU3030 Service Manual Installation: Product Specifications Environmental Limitations Location Limitations: The product is designed to be installed indoors, in a controlled environment. Air cooled models discharge very warm air into the room. Water cooled models discharge warm water into the building’s drain. Space needs to be provided for service access. Space Limitations Do not block air flow at the front. Minimum Maximum Air temperature 50oF. 100oF. Water temperature 40oF. 100oF.
CU1526, CU2026, CU3030 Service Manual Model Number Description Example: • • • • • • CU2026SA-1A C= cuber U=under the counter type 20= nominal ice capacity in 10s of pounds 26= nominal width of cabinet S= Cube size. S=small or half dice cube. M=medium or full dice cube • A=Condenser type. A=air cooled. W=water cooled • -1=115 60 Hz, -32 = 208-230 volt, 60 Hz, -6 = 230 volt, 50 Hz • A=Series revision code.
CU1526, CU2026, CU3030 Service Manual Water The quality of the water supplied to the ice machine will have an impact on the time between cleanings and ultimately on the life of the product. Water can contain impurities either in suspension or in solution. Suspended solids can be filtered out. In solution or dissolved solids cannot be filtered, they must be diluted or treated. Water filters are recommended to remove suspended solids. Some filters have treatment in them for suspended solids.
CU1526, CU2026, CU3030 Service Manual CU1526 and CU2026 Cabinet Layout POTABLE WATER INLET 3/8 FLARE 39.5 15.55 COND DRAIN 1/2 NPT (W/C ONLY) COND WATER REGULATOR 3/8 NPT (W/C ONLY) 76.3 30.04 DRAIN 3/4 FPT 15 5.92 11 4.32 POWER CORD 8.1 3.19 6.6 2.60 12.3 4.85 16.5 6.50 69.9 27.5 12.3 4.86 67.6 26.62 13.9 5.48 99.0 39.0 75.3 29.65 10.2 4.00 MINIMUM UTILITY CLEARANCE 15.2 6.00 56.2 22.12 56.5 22.
CU1526, CU2026, CU3030 Service Manual CU3030 Cabinet Layout POTABLE WATER INLET 3/8 FLARE 60.5 23.82 COND DRAIN 1/2 NPT (W/C ONLY) COND WATER REGULATOR 3/8 NPT (W/C ONLY) 74.6 29.36 DRAIN 3/4 FPT 17.7 6.99 11 4.33 8.1 3.19 POWER CORD 7 2.77 11.8 4.65 15.9 6.27 76.2 30.0 11.9 4.69 77.8 30.62 13.5 5.30 99.0 39.0 75.3 29.63 10.2 4.00 MINIMUM UTILITY CLEARANCE 15.2 6.00 65.9 25.95 61.6 24.
CU1526, CU2026, CU3030 Service Manual Bin Removal The ice storage bin is removable to allow access to the refrigeration system for service. 1. Remove front louvers. Remove left then right. 2. If the machine is in an ice making mode, push and release the Manual Harvest button to release any ice that might be on the evaporator. 3. Push and hold the controller's Off button to shut the machine off. 4. Remove all ice from the bin. Remove bolt to release bin 5. Disconnect electrical power. 6.
CU1526, CU2026, CU3030 Service Manual Plumbing Requirements All models require connection to cold, potable water. A hand actuated valve within sight of the machine is required. Air cooled models have a single 3/8” FPT inlet water connection. Water cooled models have the same inlet fitting plus an additional 3/8” FPT condenser inlet water connection. 2. Connect drain tubing to drain fittings. 3. Route the drain tubing to building drain. Follow local codes for air gap.
CU1526, CU2026, CU3030 Service Manual Electrical The machine is supplied with a power cord. This is a cord-connected unit, and must be on a separate power supply. Check the dataplate for the voltage, ampacity and maximum fuse size and per the dataplate use fuses or HACR circuit breakers. Follow All Local Codes - This Unit Must Be Grounded. Do not use extension cords and do not disable or by-pass ground prong on electrical plug. Typical Ice Making Cycle Times (minutes).
CU1526, CU2026, CU3030 Service Manual Adjustments Bridge Thickness - For the Service Tech Only 1/8-3/16" bridge 1. Remove left louver, locate controller on and off switches. 2. Push and hold Off till the machine stops. 3. Remove curtain. 4. Use a hex wrench and rotate the bridge thickness adjustment screw in 1/8 turn increments CW to increase bridge thickness. Rotate CCW to decrease bridge thickness. Caution: Do not make the bridge too thin or the machine will not harvest properly.
CU1526, CU2026, CU3030 Service Manual Use and Operation Once started, the ice machine will automatically make ice until the bin is full of ice. When ice level drops, the ice machine will resume making ice. Power Status Water De-scale On Sanitize There are four indicator lights at the front of the control box that provide information on the condition of the machine. Manual Harvest Clean Code Display Control Operation - See Manual Code Description F . . . . . . . . . . Freeze Cycle F flashes . . . .
CU1526, CU2026, CU3030 Service Manual Control Switches There is a front on and off switch, located in the top center of the louvers. Switching this switch Off will immediately stop the machine. Switching it back on will cause the machine to start in a timed harvest cycle. Power Status Water De-scale On Sanitize Off Technician Section Manual Harvest Clean Code Display Control Operation - See Manual Code Description F . . . . . . . . . . Freeze Cycle F flashes . . . . Freeze Cycle is Pending H . . .
CU1526, CU2026, CU3030 Service Manual Cuber System Information Overall System Type: • Refrigeration: Mechanical, either air cooled or water cooled • Water System: Inlet water float valve fills reservoir continuously. Purge solenoid valve opens to • • • • • • discharge some reservoir water once per cycle.
CU1526, CU2026, CU3030 Service Manual Controller Information Machine Indicator Lights • • • • Power Status Water Clean Code Display Main codes - automatically displayed F F . . . . . . . Freeze Cycle flashes. . . . Freeze Cycle is Pending H . . . . . . . Harvest Cycle H flashes . . . Manual Harvest b . . . . . . . Bin is Full C . . . . . . . Clean Cycle L . . . . . . . Board Locked d . . . . . . . Test Mode O . . . . . . . Off E . . . . . . . Self Test Failed 1 1 2 flashes. . . .
CU1526, CU2026, CU3030 Service Manual Controller Information Component Indicator Lights • • • • • • • • • • • Condenser Fan / Aux Water Pump Purge Valve Water Solenoid Hot Gas Compressor Ready to Harvest Sump Empty Sump Full Curtain SW1 Curtain SW2 Component Indicator Light Table System Indicator Light ON Condenser Fan / AUX Fan Motor Powered Water Pump Pump Motor Powered Purge Valve Purge Valve Opens Inlet Water Solenoid Valve Not used this model Hot Gas Hot Gas Valve Opens and harvest assist
CU1526, CU2026, CU3030 Service Manual How It Works - Air Cooled Freeze Cycle. At start up the controller operates the water pump and purge valve to drain the reservoir. The float valve refills the reservoir after the purge valve shuts off. When the reservoir has filled, the compressor and water pump start. After the discharge pressure has increased past the cut in point of the fan pressure control, the fan motor(s) will begin to operate and warm air will be discharged.
CU1526, CU2026, CU3030 Service Manual How It Works - Water Cooled Freeze Cycle. At start up the controller operates the water pump and purge valve to drain the reservoir. The float valve refills the reservoir after the purge valve shuts off. When the reservoir has filled, the compressor and water pump start. After the discharge pressure has increased past the set point of the water regulating valve, the water regulating valve will open and warm water will be discharged out the condenser drain.
CU1526, CU2026, CU3030 Service Manual Electrical Sequence - Air or Water Cooled Power connected, unit previously switched Off. Control board does a self check. If the self check fails, the unit displays an E and no further action will occur. If the self check passes, the controller will display a 0, the curtain light(s) will be ON and the Power and Sump Empty lights will be ON. Pushing and releasing the On button will start the ice making process. The display will begin to blink F.
CU1526, CU2026, CU3030 Service Manual Electrical Sequence - Air or Water Cooled (continued) Indicator Information: The display shows a non-blinking H. The Power and Status Lights will be Green. The compressor, hot gas valve and one or two curtain switch lights will be ON. After a few seconds the water pump, purge valve and inlet water valve lights will come on. The fan motor(s) shut off and remain off throughout the harvest cycle. The harvest assist solenoid is connected in parallel with the hot gas valve.
CU1526, CU2026, CU3030 Service Manual Electrical Component Details Compressor • Operated by the compressor contactor. Uses PTCR and run capacitor. Contactor • Operated by the controller and the high pressure cut out switch. Line voltage coil. When energized the Compressor indicator light will be ON. Water Pump • Operated by the controller. When energized, the Water Pump indicator light will be ON. Purge Valve • Operated by the controller. Line voltage coil.
CU1526, CU2026, CU3030 Service Manual Electrical Component Details - continued Hot Gas Valve • Operated by the controller in parallel with the harvest assist solenoid. Cycles on and off at the beginning of a restart. Energized throughout the harvest cycle. Line voltage coil. Controller • Senses ice thickness, water conductivity, water temperature, discharge temperature. Controls compressor contactor, fan motor, water pump, hot gas valve, purge valve, harvest assist solenoid.
CU1526, CU2026, CU3030 Service Manual Refrigeration & Water Systems Refrigerant: R-404A Compressor: Copeland or Tecumseh hermetic by model Expansion valve: Non adjustable, internally equalized Hot gas valve: Pilot operated, line voltage coil. Condensers: Forced draft air, counterflow water. All air cooled models have left side air inlet. All air cooled models exhaust air out the right front. Air filters: Mounted in left front grill and under the base on the CU3030. Fan pressure control. All AC.
CU1526, CU2026, CU3030 Service Manual Control Operation Standard control: • Electronic controller operating from a 12 AC volt power supply. Will operate within a voltage range • • • • • • • • • • between 10 and 15.5. Indicator lights, four visible on outside of control box: Power, Status, Water, De-scale/Sanitize. Accessible On - Off switch. Switch makes or breaks power to the controller - Discontinued 2/2012. Code Display: Displays letters and numbers to indicate cycles and diagnostic codes.
CU1526, CU2026, CU3030 Service Manual Control Safeties Max freeze time – 84 minutes When exceeded, the controller will attempt another freeze cycle. If the next cycle's freeze time is less than maximum, the control will continue normal ice making. If the next freeze cycle was too long, the control will again attempt another freeze cycle. If the freeze cycle is too long three consecutive cycles, the controller will shut the unit off and it must be manually reset.
CU1526, CU2026, CU3030 Service Manual Restarts Power Interruption The controller will automatically restart the ice machine after adequate voltage has been restored. This also occurs after the on-off switch has been cycled. • H blinks on code display • Status indicator light blinks • Reservoir is drained and refilled Default harvest is initiated. The curtain switch does not have to open to terminate harvest, harvest will continue until the default harvest time expires. Default harvest time is 3 minutes.
CU1526, CU2026, CU3030 Service Manual Control Button Use (from standby - status light off) Set purge level, 1-5 (1 is minimum, 5 is maximum) or Automatic: • Hold off button in for 3 seconds. Release. • Press and release the On button to cycle through and select one of the five purge settings or to use the Automatic setting. Recall diagnostic code: • Hold off button in for 3 seconds. Release. • Press and release the Harvest button to cycle through each of the last 10 error codes from most recent to oldest.
CU1526, CU2026, CU3030 Service Manual Test Mode: • Depress Off for 3 seconds, release. Then depress Clean for 3 seconds. • At 30 seconds the WP will turn on. You will be able to see and hear the water running over the plate. After 10 seconds the PV and HGV will turn on. Water will be purging from the machine. After 10 more seconds the compressor will start. 5 seconds later the HGV will close. The compressor will run for a total of 20 seconds. After which everything will turn off for 5 seconds.
CU1526, CU2026, CU3030 Service Manual Service Diagnosis No ice Problem Likely Cause Probable Solution No power to unit Power disconnected Check breaker or fuse.
CU1526, CU2026, CU3030 Service Manual Service Diagnosis Problem Likely Cause Probable Solution Pump hose disconnected Check hose Check compressor contactor, check controller using test mode Compressor not operating Check compressor start components, check PTCR resistance and temperature Check compressor voltage Check compressor windings Shut down on maximum freeze time Low refrigerant charge Add some refrigerant and restart unit. If cycle time improves, look for leak.
CU1526, CU2026, CU3030 Service Manual Service Diagnosis Problem Shut down on maximum harvest time Likely Cause Probable Solution Ice bridge thickness too small, not enough ice to open curtain Check and adjust if needed Ice bridge thickness too large, ice frozen to evaporator frame Check and adjust if needed Purge valve does not open, water melts ice bridge, not enough ice to open curtain Check purge valve Incomplete ice formation Check water distributor for partially plugged holes Curtain out of
CU1526, CU2026, CU3030 Service Manual Service Diagnosis - Low ice making capacity - air cooled Problem Long freeze cycle Long Harvest Cycle False bin full signal Likely Cause Probable Solution Dirty air filter Clean filter Dirty condenser Clean condenser Hot ambient Reduce room air temperature Water leak Check purge valve, check curtain Water inlet valve leaks through Check inlet valve Low on refrigerant Add refrigerant, if cycle time drops, check for leak Incorrect superheat Check evapor
CU1526, CU2026, CU3030 Service Manual Cleaning, Sanitation and Maintenance This ice system requires three types of maintenance: • Remove the build up of mineral scale from the ice machine’s water system and sensors. • Sanitize the ice machine’s water system and the ice storage bin. • Clean or replace the air filter and clean the air cooled condenser (air cooled models only). It is the User’s responsibility to keep the ice machine and ice storage bin in a sanitary condition.
CU1526, CU2026, CU3030 Service Manual 10. Push and release the On button to resume ice making. 11. Return the top panel and front louvered panel to their normal position and secure with the original fasteners. Air cooled condenser filter Inspect Orifice Holes 1. Remove left front grill . Inspect Water Distributor 2. Wash the dust and grease off the filter. 1. Locate ice thickness sensor. Squeeze mounting legs together to release sensor.
CU1526, CU2026, CU3030 Service Manual Test Procedures - Sensors All electrical components in this ice machine can be diagnosed with a volt-ohmmeter. Curtain Switch: 1. Test using the controller’s indicator lights. Observe SW1 or SW2. Open and close the curtain. When the curtain is opened, the SW light will be ON. When the curtain gets to within a half inch of closing (at the switch) the SW light will go OUT. 2. Test with an ohmmeter. Disconnect electrical power. Open the control box cover.
CU1526, CU2026, CU3030 Service Manual Sensor Testing Water Sensor The water sensor has two functions, the first is to stop the machine from operating if there is no water, the second is to sense the conductivity of the water supply. This test is for sensing that there is water in the sump. 1. Test using the controller’s indicator lights (sump empty and sump full). Shut the water supply to the unit off.
CU1526, CU2026, CU3030 Service Manual Thermistors Deg.
CU1526, CU2026, CU3030 Service Manual Test Procedures - Loads model was equipped with a potential relay, start capacitor and run capacitor, those should be replaced with the compressor. Most Scotsman service compressors include those parts. Compressor Electrical Shock Hazard. Use extreme caution while performing diagnostic procedures. Fan motor 1. Test using the controller’s indicator lights. Note: Fan pressure control connection must be jumped to perform this test. Failure to start.
CU1526, CU2026, CU3030 Service Manual Test Procedures Water Pump Purge valve 1. Test using the controller’s indicator lights. Check the indicator light during the freeze cycle. The light will be On for all but the 30 second anti-slush period, so observe the light for one minute. When it is On, check the water pump, it should be operating. If not, check voltage to the pump. If low check the voltage from the controller to ground. The water pump pin is number 6.
CU1526, CU2026, CU3030 Service Manual Test Procedures switch will re-close and the contactor coil will be energized. Compressor contactor 1. Test using the controller’s indicator lights. When the unit is in ice making mode the compressor contactor will have power. Check the Compressor indicator light, when it is on the compressor contactor will have pulled in. If it is not, do a voltage check. Place voltmeter leads on the coil of the contactor. There should be full voltage .
CU1526, CU2026, CU3030 Service Manual Test Procedures Controller Hot Gas Valve The controller’s software operation is confirmed if it is functioning. Execute the test to confirm its operation of the loads. Illumination of a diagnostic code (other than E) is not an indication of controller failure. Each code requires its own diagnosis. 1. Test using the controller’s indicator lights. If the unit is running, or has been off for more than 4 minutes, push and release the Harvest button.
CU1526, CU2026, CU3030 Service Manual Technical Information Pressure Control Information Cut In (PSIG) Cut Out (PSIG Fan Pressure Control 240 190 High Pressure Cut Out AC 390 500 High Pressure Cut Out WC 300 400 Compressor Amp Draws CU1526 CU2026 CU3030 Voltage Brand Base Model Freeze Harvest 115 Copeland ASB14C3E-IAA-302 5 - 5.5 5.6 - 5.9 230/50 Copeland ASB14C3E-IAZ-202 115 Copeland ASE24C3E-IAA-302 5.4 - 5.9 6.1 - 6.
CU1526, CU2026, CU3030 Service Manual Performance Data, CU1526 CU1526A Ambient Air Temp., Degrees F. 70 Cycle Time (minutes) Water Temp 50 70 80 90 80 36 37 38 39 24 25 26 27 22-23 24 25 26 90 Suction Pressure (PSIG) End of Freeze Harvest 36 - 39 105 - 110 36 - 38 115 - 120 Discharge Pressure (PSIG) End of Freeze Harvest 211 120 260 130 CU1526W Ambient Air Temp., Degrees F.
CU1526, CU2026, CU3030 Service Manual Performance Data, CU2026 CU2026A Ambient Air Temp., Degrees F. 70 Cycle Time (minutes) Water Temp 50 70 80 90 80 25 26 27 28 18 19 20 21 16-17 17 18 19 90 Suction Pressure (PSIG) End of Freeze Harvest 33 - 34 100 - 105 35 - 36 125 - 130 Discharge Pressure (PSIG) End of Freeze Harvest 235 135 305 165 CU2026W Ambient Air Temp., Degrees F.
CU1526, CU2026, CU3030 Service Manual Performance Data, CU3030 CU3030A Ambient Air Temp., Degrees F. 70 Cycle Time (minutes) Water Temp 50 70 80 90 80 19 20 22 25 14 15 16 17 13 14 15 16 90 Suction Pressure (PSIG) End of Freeze Harvest 25 - 26 84 - 85 29 - 30 100 - 105 Discharge Pressure (PSIG) End of Freeze Harvest 220 170 270 200 CU3030W Ambient Air Temp., Degrees F.
THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
W THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
W THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
W THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
THIS UNIT MUST BE GROUNDED. DISCHARGE TEMP. SENSOR SUMP TEMP.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Water Reservoir CU1526 or CU2026 1. Top access and top panel removal is required for this procedure. 2. Shut water supply OFF. 3. Remove left grill. 4. Push and hold the Off button until the unit stops. 5. Push and hold the Clean button until a - appears in the code display. The pump will drain the reservoir. 6. Disconnect electrical power. Electrical Shock Hazard. Disconnect electrical power before beginning removal procedure. 7.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Water Reservoir CU3030 1. Shut water supply OFF. 2. Remove left grill. 3. Push and hold the Off button until the unit stops. 4. Push and hold the Clean button until a - appears in the code display. The pump will drain the reservoir. 5. Push two tabs (located left of the pump motor) in until they release from the pump bracket. 6. Push in release ring on water fitting and pull water inlet tube out. Electrical Shock Hazard.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Float valve CU1526 and CU2026 1. Top access and top panel removal will be required for this procedure. 2. Shut water supply Off. 3. Remove two screws and drop the front edge of the reservoir. 4. Disconnect hose from water pump outlet. 5. Disconnect water supply tube at float valve. 6. Lift the right side of the pump bracket up, push to the left and pull the right end of the bracket up so the mounting pins clear the keyhole slots. 7.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Water Pump CU1526 or CU2026 1. Top access and top panel removal is required for this procedure. 2. Disconnect electrical power. Electrical Shock Hazard. Disconnect electrical power before beginning removal procedure. 3. Shut water supply Off. 4. Remove top panel. 5. Remove two screws holding reservoir to evaporator support bracket. Lower sump at front. 6. Reach in sump and remove water pump discharge hose. 7.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Purge valve 1. Remove left front grill. 2. Push and hold the Off button to shut the machine off. 3. Disconnect electrical power. Electrical Shock Hazard. Disconnect electrical power before beginning removal procedure. 4. Perform all procedures to remove the ice storage bin. 5. Unplug wires from valve coil. Note: The coil can be removed from the valve body by rotating it 1/8 turn CW.
CU1526, CU2026, CU3030 Service Manual Removal and Replacement Fan Blade and/ or Motor 1. Disconnect electrical power. Electrical Shock Hazard. Disconnect electrical power before beginning removal procedure. 2. Go thru all steps to remove the ice storage bin. 3. Unplug fan motor from harness. 4. Remove four 3/8" hex head cap screws securing fan motor brackets to shroud. 5. Remove fan blade. If installing new fan blade, replace blade at this point and reverse to reassemble.
CU1526, CU2026, CU3030 Service Manual Refrigeration Removal and Replacement Procedures Thermostatic Expansion Valve 1. Remove left front grill. 2. If the machine was in operation, push and release the Harvest button to shut it down. Wait until the harvest cycle has ended so the evaporator has no ice on it. 3. Go thru all steps to remove the bin. 4. Disconnect electrical power. 5. Recover refrigerant. 6. Remove insulation covering expansion valve and bulb. 7. Remove strap securing bulb to suction line. 8.
CU1526, CU2026, CU3030 Service Manual Refrigeration Removal and Replacement Procedures Compressor 1. Remove left front grill. 2. If the machine was in operation, push and release the Harvest button to shut it down. Wait until the harvest cycle has ended so the evaporator has no ice on it. 3. Go thru all steps to remove the bin. 4. Open the replacement compressor box. Check the compressor nameplate, be SURE that the replacement compressor is the correct one for the unit. 5. Disconnect electrical power. 6.
CU1526, CU2026, CU3030 Service Manual Refrigeration Removal and Replacement Procedures 23. Attach compressor terminal cover. 24. Reconnect electrical power. 25. Return bin and all panels to their original positions. Note: If the compressor is being returned for warranty, braze the stubs shut and tag the compressor with the required information. Evaporator Note: Back and Top access is required for this procedure 1. Remove top panel. 2. Remove access cover on back panel 3.
CU1526, CU2026, CU3030 Service Manual Refrigeration Removal and Replacement Procedures 18. Install the harvest assist solenoid. Note location of ejector pin. Adjust position of the evaporator slightly to center the pin in the guide hole of the evaporator. When centered, tighten all evaporator fasteners. 19. Open nitrogen valve 20. Reconnect inlet and outlet tubes by brazing the copper tubes together. 21. Replace filter drier. 22. Shut access valves, remove nitrogen bottle. 23.
