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Scotsman UF424A-1A, Technical Manual

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Scotsman UF424A-1A Technical Manual Download Page 24

UF424 / UN324 Technical Manual

September 2017

Page 24

Panel Removal

Top Panel

Requires back access
1.  Remove three thumbscrews holding top panel to 

back panel.

2.  Pull top panel back slightly to release it from the 

top of  the machine, then lift up and off the unit.

Note: Upper brace may come with top panel, it is not 

attached to the unit.

Door

1.  Remove top panel.
2.  Push door to full open, then lift back end up and 

remove two bushings. Retain the bushings.

3.  Pull door up thru the slot until the last two 

bushings appear. Remove and retain them.

4.  Pull door up and out of the machine

Side Panel

1.  Remove front, top and back panels.
2.  Remove two screws at each side of the top edge 

of the unit.

Note: The front screw on the top of each side will not 

be tightened fully, its correct position is slightly above 

the surface of the top  so that the head will fit into the 

key hole slots in the top panel.

Summary of Contents for UF424A-1A

Page 1: ...Technical Manual for Model UF424 and UN324 ...

Page 2: ...ompany Locate one from the Scotsman website www Scotsman ice com Table of Contents Specifications 3 Cabinet Drawing 4 Plan and Front Views 5 Side and Back Views 6 Operational Data 7 Placement 8 Installation 9 Initial Start up 10 Maintenance and Cleaning 11 Condensers and Air Filter Cleaning 13 Operation 14 Basic Troubleshooting 15 Controller Functions 16 Controller Details 17 Controller Diagnostic...

Page 3: ...re and any damage caused by DI water will not be covered by warranty Operating the machine outside of any of the above limitations is considered abuse and any resulting damage is not covered by warranty and could cause a complete loss of warranty coverage Warranty Information The warranty statement for this product is provided separately from this manual Refer to it for applicable coverage In gene...

Page 4: ...UF424 UN324 Technical Manual September 2017 Page 4 Cabinet Drawing DRAIN POWER CORD WATER INLET ACCESS ...

Page 5: ...UF424 UN324 Technical Manual September 2017 Page 5 61cm 24 0in 72 3cm 28 4in 99cm 39 0in 84 7cm 33 4in 50 8cm 20 0in AIR EXHAUST AIR INLET Plan and Front Views ...

Page 6: ... UTILITY CLEARANCE 72 8cm 28 7in 16 8cm 6 6in 7 8cm 3 1in 17 5cm 6 9in 24 5cm 9 7in 13 6cm 5 4in 11 9cm 4 7in WATER INLET 3 8 FLARE UNIT DRAIN 3 4 FPT POWER CORD CONDENSER WATER INLET 3 8 18NPT CONDENSOR WATER DRAIN CONNECTION 1 2 14 NPT WATER REGULATOR ADJUSTMENT ACCESS Side and Back Views ...

Page 7: ...ps Compressor Amps UF424A 1A UN324A 1A 560 690 6 3 7 1 1 1 4 5 5 8 UF424W 1A UN324W 1A 540 575 6 1 6 7 1 1 1 4 5 5 8 UF424A 6A UN324A 6A Model Condenser 70 50 Suction Pressure PSIG 90 70 Suction Pressure PSIG 70 50 Discharge Pressure PSIG 90 70 Discharge Pressure PSIG UF424A 1A UN324A 1A Air 6 8 8 9 130 135 180 185 UF424W 1A UN324W 1A Water 6 8 6 8 135 135 Note 70 50 and 90 70 refer to the air and...

Page 8: ...nsitive areas should consider water cooled equipment or locate the machine where the noise from ice making will not objectionable Unpack 1 Separate the carton from the shipping pallet 2 Inspect for any hidden shipping damage If any is found retain carton and notify carrier for potential claim Shipping damage is not covered by warranty Caution Tip Over hazard to prevent injury or damage to the mach...

Page 9: ...ning The bin drain must be vented if there is a long horizontal run 5 feet or more All drains are gravity and must have a minimum fall of 1 4 per foot of horizontal run Maintain the air gap required by local code between the end of the drain to and the building drain receptacle Drain tubing should be insulated to prevent condensation from forming on the tubing 3 Water cooled models have a separate...

Page 10: ...intenance requirements of the unit Make sure they know who to call for service Fill out the Customer Evaluation and Warranty Registration form and mail it in to Scotsman or register the unit at Scotsman s website www scotsman ice com Once started the ice machine will automatically make ice until the bin level sensors are blocked This will happen once the ice piles up to the sensors The typical ice...

Page 11: ...om the reservoir 6 Shut water supply off at the reservoir by turning the knob counterclockwise 7 Locate the evaporator drain in the ice machine compartment Unplug it and drain the evaporator 8 Replug the drain 9 Mix a solution of 1 5qt 1 4L of warm water 900 F 320 C to 1100 F 430 C and 4 ounces of Scotsman Clear 1 Ice Machine Scale Remover Ice machine cleaner contains acids Acids can cause burns I...

Page 12: ...n and the inner front cover Sanitize Water System 1 Create a solution of sanitizer Mix 4oz 118ml of NuCalgon IMS III and 2 5gal 9 5L of 900 F 320 C to 1100 F 430 C potable water to create a 200 ppm solution 2 Pour the sanitizing solution into the reservoir until it is full and wait 2 minutes 3 Turn on the water supply and press the ON Off button to turn the ice machine on 4 Operate the machine for...

Page 13: ... will increase as the water regulating valve opens further to keep the discharge pressure at the set point Scale on the inside of the condenser may be cleaned by circulating an acid solution with an auxiliary pump Filters and Air Cooled Condenser The air filter located on the lower front grill will capture airborne dust during operation As the dirt builds up it begins to restrict air flow and caus...

Page 14: ...erature does not change as the replenished water keeps adding heat The ice slides down a chute into the insulated bin The bin is not refrigerated There is a drain at the bin s floor to let melt water out As it is made ice will pyramid under the chute and form a pile that gradually increases to the point that the top of the pile enters the chute blocking the infrared light between the ice sensor s ...

Page 15: ...sor hot and overheated check start relay and start capacitor Check system charge Check TXV for high superheat No power to compressor or contactor coil Compressor light is ON Replace controller Compressor at room temperature will not start Check windings If open replace compressor If not open check replace start relay and start capacitor Compressor operating auger turning no ice is made Check refri...

Page 16: ...e to Clean Glows when it is time to clean the machine Auger glows when the auger motor is on Compressor glows when the compressor is on There is also a code display the codes are O for off F for ice making b for bin full E for controller error C for clean mode d for test mode 1 for auger rotation direction wrong 2 for auger speed too slow 3 for no water sensed 4 for high refrigerant pressure If a ...

Page 17: ...re is a Test Mode The Test Mode operates each load in sequence to confirm that it is being powered by the controller To start Test Mode Push and HOLD the ON OFF button at the same time push and HOLD the CLEAN button When a d appears in the code display release the buttons the test mode will begin Time seconds On Off 0 Compressor Auger Gear Motor 10 Compressor and Auger Gear Motor 20 Auger Gear Mot...

Page 18: ...erating slowly Clean ice making system and retry If unit shuts off again right after a reset magnet rotor on motor shaft may be loose 3 No water in reservoir Restore water If there is water is it too pure Are sensor wires connected 4 High pressure cut out open Check fan motor on air cooled or water supply on water cooled Status light is on Unit is in ice making mode Normal may not be making ice if...

Page 19: ... electrically tied to the compressor contactor Ice making continues until the infrared light is blocked and the unit shuts down on bin full It can also stop from any of these safeties 1 Hi pressure cut out 230 PSIG automatic reset when the pressure drops to 190 PSIG If triggered it signals a severe condition where there was either no fan blade rotation on air cooled models or no water supplied to ...

Page 20: ...compressor is not hot the overload itself could be the problem Overloads also open due to high current and a shorted winding could cause that Check for shorted or grounded windings with a multimeter High superheat is caused by lack of refrigeration possibly from low charge or a TXV starving the evaporator The refrigeration system is steady state When in operation and stabilized it will maintain ne...

Page 21: ... compressor to chassis 6 Disconnect suction discharge and process tubes from compressor 7 Remove compressor from unit 8 Install new compressor in unit 9 Reconnect suction discharge and process tubes using the proper techniques of the refrigeration trade 10 Remove and replace the dryer 11 Attach a vacuum pump with micron gage to the system and evacuate it to 300 microns 12 Reattach electrical wires...

Page 22: ...ts Note Fan blade is marked Nut Side for correct positioning on motor Air flow direction is pull thru the condenser Replace condenser The deck cover cannot be removed without disconnecting ice making system from the refrigeration system The condenser must be replaced from the front Begin by taking the fan motor blade and brackets off the condenser Then from the front remove the screw holding the c...

Page 23: ... overfill Rotation Sensor The sensor consists of a pick up sensor and a magnet The pick up has a wire that connects to the controller The magnet is in the rotating magnet holder on top of the auger motor if the rotor is loose it will not rotate and the sensor will shut the machine off for no rotation 1 Remove front and left side panels 2 Remove motor cover 3 Check that rotor has magnet and is secu...

Page 24: ...emove top panel 2 Push door to full open then lift back end up and remove two bushings Retain the bushings 3 Pull door up thru the slot until the last two bushings appear Remove and retain them 4 Pull door up and out of the machine Side Panel 1 Remove front top and back panels 2 Remove two screws at each side of the top edge of the unit Note The front screw on the top of each side will not be tigh...

Page 25: ...around the machine will be needed 6 Remove front panel 7 Remove top panel 8 Remove door 9 Remove both back panels 10 Remove both side panels 11 Remove evaporator cover 12 Push chute cover back and remove 13 Unscrew ice sweep and remove 14 Lift up and remove chute 15 Disconnect water inlet from reservoir float valve 16 Disconnect evaporator water inlet from reservoir 17 Pull water inlet tube back t...

Page 26: ...the machine 9 Remove three 1 4 hex socket head screws securing pan to gear reducer Install new gear reducer Be sure vent plug is open Gear Reducer The gear reducer is a sealed component No gears or shaft bearings are available A gear reducer without motor is available A properly operating gear reducer will operate quietly and draw a consistent amount of amps It will not leak lubricant Oil discharg...

Page 27: ...ment motor is supplied attached to a gear reducer cover Remove the motor from the cover and attach it to the gear reducer A reversed motor code 1 is a strong symptom of a motor that should be replaced Removal Suggested tools include a 1 4 inch drive ratchet set 1 Disconnect electrical power 2 Remove top panel 3 Remove front panel 4 Close float valve or shut water off to unit 5 Drain reservoir and ...

Page 28: ...evaporator 6 Un braze the evaporator refrigerant inlet and outlet 7 Lift the evaporator up and off the bottom bearing retainer The stationary half of the water seal will be in the bottom of the tube The rotating half is on the auger 8 Confirm auger is un damaged 9 Install new water seal 10 Replace bottom and top bearings 11 Attach new evaporator to adapter 12 Replace the dryer and evacuate the sys...

Page 29: ... to motor 3 Use a cordless impact driver to remove the screw holding the magnet rotor If needed use the special thin 3 8 open end wrench to hold the motor shaft 4 Remove the original drive motor 5 Separate the replacement drive motor from the shipping casting 6 Install the rotor of the replacement motor into the gear reducer 7 Attach the winding of the replacement motor to the gear reducer 8 Attac...

Page 30: ...ift up and pull ice chute off evaporator 5 Remove four 1 4 inch hex head socket screws 6 Lift breaker off auger Auger 1 Shut water off to machine 2 Drain reservoir 3 Disconnect electrical power 4 Remove top panel 5 Unscrew ice sweep 6 Lift up and pull ice chute off evaporator 7 Remove four 1 4 inch hex socket head socket screws 8 Return ice sweep to auger 9 Lift on ice sweep to remove auger 10 See...

Page 31: ...evaporator 9 Slip the evaporator onto the bottom bearing retainer the bearing retainer will push the water seal up into the correct position Note The bottom bearing should have been replaced at this time 10 Secure the evaporator to the bearing retainer with the original socket head screws Be sure they are tight Top Bearing 1 Go thru the process of removing the extruder breaker 2 Remove the clip ho...

Page 32: ...Cord 1 Disconnect power 2 Remove front top and right side panels 3 Pull control box out all the way 4 Remove power leads from contactor 5 Pull cord from control box 6 Loosen strain relief thru access hole in right side of chassis 7 Pull cord thru back panel Note It is critical that only a like OEM power cord be used as a replacement Controller 1 Disconnect electrical power 2 Remove front panel 3 P...

Page 33: ...UF424 UN324 Technical Manual September 2017 Page 33 Schematic Diagram ...

Page 34: ...UF424 UN324 Technical Manual September 2017 Page 34 Wiring Diagram ...

Page 35: ...SCOTSMAN ICE SYSTEMS 101 Corporate Woods Parkway Vernon Hills IL 60061 800 726 8762 www scotsman ice com ...

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