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Page 1
MXG 328
MXG 428
MXG 438
MXG 638
MXG 938
modular cubers
Scotsman Ice Srl
Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy
Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500
Direct Line to Service & Parts:
Phone +39-02-93960350 - Fax +39-02-93540449
Website: www.scotsman-ice.it
E-Mail: scotsman.europe@scotsman.it
SERVICE MANUAL
Electronic
Page 1
REV. 06/2017
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Summary of Contents for Scotsman MXG 328
- Page 1 Page 1 Page 1 SERVICE MANUAL MXG 328 MXG 428 MXG 438 MXG 638 MXG 938 Electronic modular cubers Scotsman Ice Srl Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500 Direct Line to Service & Parts: Phone +39-02-93960350 - Fax +39-02-93540449 Website: www.scotsman-ice.it...
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Page 2: Table Of Contents
Page 2 Page 2 TABLE OF Table of contents CONTENTS Specifications MXG 328 Specifications MXG 428 Specifications MXG 438 Specifications MXG 638 Specifications MXG 938 GENERAL INFORMATION AND INSTALLATION Introduction Unpacking and Inspection - Ice maker Unpacking and Inspection - Storage bin... - Page 3 NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine. To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.
- Page 4 Page 4 Page 4 SPECIFICATIONS DIMENSIONS: HEIGHT WIDTH DEPTH 703.5 mm. WEIGHT Kgs. MXG 328 - MACHINE SPECIFICATIONS Model Cond. unit Finish Water req. - lt/24 HR MXG 328 AS 6 Stainless steel MXG 328 WS 6 Water Stainless steel...
- Page 5 NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine. To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.
- Page 6 Page 6 Page 6 SPECIFICATIONS DIMENSIONS: HEIGHT WIDTH DEPTH 703.5 mm. WEIGHT Kgs. MXG 428 - MACHINE SPECIFICATIONS Model Cond. unit Finish Water req. - lt/24 HR MXG 428 AS 6 Stainless steel MXG 428 WS 6 Water Stainless steel Starts Electric power cons.
- Page 7 NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine. To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.
- Page 8 Page 8 Page 8 SPECIFICATIONS DIMENSIONS: HEIGHT WIDTH DEPTH 704.5 mm. WEIGHT Kgs. MXG 438 - MACHINE SPECIFICATIONS Model Cond. unit Finish Water req. - lt/24 HR MXG 438 AS 6 Stainless steel MXG 438 WS 6 Water Stainless steel Starts Electric power cons.
- Page 9 NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine. To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.
- Page 10 Page 10 Page 10 SPECIFICATIONS DIMENSIONS: HEIGHT 1128 mm. WIDTH 773 mm. DEPTH 700 mm. WEIGHT 116 Kgs. MXG 638 - MACHINE SPECIFICATIONS Model Cond. unit Finish Water req. - lt/24 HR MXG 638 AS 6 Stainless steel MXG 638 WS 6 Water Stainless steel 3400...
- Page 11 NOTE. The daily ice-making capacity is directly related to the condenser air inlet temperature, water temperature and age of the machine. To keep your SCOTSMAN MODULAR CUBER at peak performance levels, periodic maintenance checks must be carried out as indicated on maintenance section of this manual.
- Page 12 Page 12 Page 12 SPECIFICATIONS DIMENSIONS: HEIGHT 1236 WIDTH DEPTH 704.5 mm. WEIGHT Kgs. MXG 938 - MACHINE SPECIFICATIONS Model Cond. unit Finish Water req. - lt/24 HR MXG 938 AS 6 Stainless steel MXG 938 WS 6 Water Stainless steel 2750 Starts Electric power cons.
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Page 13: General Information And Installation
Forward the completed self-addressed SB 193 registration card to Scotsman Ice srl. SB 322 SB 393 SB 530. C. LOCATION AND LEVELLING UNPACKING AND INSPECTION WARNING. -
Page 14: Electrical Connections
Water supply - Water cooled models 10. Install the plastic ice cube deflector by The water cooled versions of SCOTSMAN Ice hooking it on the flange of the ice chute opening Makers require two separate inlet water supplies, in unit base (see illustration). -
Page 15: Final Check List
Page 15 Page 15 FINAL CHECK LIST Have the bolts holding the compressor down Is the unit in a room where ambient temperatures are within a minimum of 10°C been checked to ensure that the compressor is (50°F) even in winter months? snugly fitted onto the mounting pads? Is there at least a 15 cm (6") clearance Check all refrigerant lines and conduit lines... -
Page 16: Operating Instructions
NOTE. Every time the unit returns under NOTE. Pcb is equipped by "no delay" power, after having been switched off, the (MXG 328-428-438) or 60 minutes jumper water inlet valve, the hot gas valve and the setting start up delay (see pag. 26). In case... -
Page 17: Operatiobnal Checks
Page 17 Page 17 NOTE . If in the 5 minutes length of the water NOTE. On air cooled models the condenser filling phase the machine sump reservoir temperature sensor, which is located within does not get filled with water up to the rim of the condenser fins, keep the head (condensing) the overflow pipe, it is advisable to check: pressure at average 21 °... - Page 18 Page 18 Page 18 Check to see through the ice discharge The ice making process takes place thereby, opening that the self propeller spray bar is with the water sprayed into the molds that gets correctly rotating and that the water jets uniformely gradually refrigerated by the heat exchange with the refrigerant flowing into the evaporator reach the interior of the inverted mold cups and...
- Page 19 Page 19 Page 19 During the freezing process, when the evaporator After about 17-20 minutes from the temperature falls below an established value, to beginning of the freezing cycle, in an hypothetic the evaporator temperature sensor supplies a ambient temperature of 21°C , the defrost cycle low voltage power signal to the electronic control takes place with the hot gas and the water inlet device (P.C.BOARD) in order to activate an...
- Page 20 Page 20 Page 20 Check the texture of ice cubes just released. NOTE. The ICE LEVEL CONTROL They have to be in the right shape with a small (INFRARED SYSTEM) is independent of the depression of about 5-6 mm in their crown. temperature however, the reliability of its If not, wait for the completion of the second cycle detection can be affected by external light...
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Page 21: Freezing Cycle
BOARD which in turn activates an electronic timer. (on MXG 328-428-438-638) and EXP valve on The timer, which is built-in the P.C. BOARD, MXG 938 where, due to the heat exchanging action, it... - Page 22 Page 22 Page 22...
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Page 23: Harvest Cycle
Page 23 Page 23 it causes the total and immediate SHUT-OFF ATTENTION. In case, after 15 minutes from the beginning of the freezing cycle, of the machine in order to prevent the unit the temperature of the evaporator sensor from operating in abnormal and dangerous probe is higher then 0°C (32°F) (shortage conditions. -
Page 24: Control Sequence
Page 24 Page 24 The incoming water, passing through the water Electronic Controls & Sensors .. ON OFF inlet valve and the flow control, runs over the • Evaporator Sensor ....... evaporator platen and then flows by gravity • Condenser Sensor ....... through the dribbler holes down into the sump/ •... -
Page 25: Component Description
MODEL VOLTAGE CUBE SIZE (R404a - gr.) suction discharge (beg./end freez.) 3,6 / 1,85 15 - 16,5 MXG 328 A 230/50/1 3,1 / 1,6 14,5 - 16,5 3 / 1,5 15 - 16,5 MXG 328 W 230/50/1 3,7 / 1,9... - Page 26 Page 26 Page 26 CONDENSER TEMPERATURE SENSOR here below procedure: a) Switch OFF the machine at Master Switch The condenser temperature sensor probe, b)Push and hold the PC Board Push Button located within the condenser fins (air cooled c) Switch ON the machine at Master Switch version) or in contact with the tube coil (water cooled version) detects the condenser tempera- d) Keep pushed the PC Board Push Button...
- Page 27 Page 27 Page 27 At restart, from any tripping OFF at Bin Full, the new PC Board assures 45 seconds water filling The length of Harvest is equal to: phase so to refill the water sump up to the maximum level. •35”...
- Page 28 Page 28 Page 28 DIP SWITCH REASON WHY STATUS The P.C.BOARD which controls the entire operation of the ice maker, has a DIP SWITCH with ten switching keys which allow to set up ON STEADY UNIT UNDER POWER the micro processor program in order to extend or to shorten the length of freezing cycle in relation to the different model and versions of ice machines.
- Page 29 Page 29 Page 29 The 9th key is used to supply power to the water COMPRESSOR pump for the first 15 seconds of the defrost cycle The hermetic compressor is the heart of the - position OFF - or for the first 30 seconds - refrigerant system and it is used to circulate and position ON.
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Page 30: Adjustment, Removal And Replacement Procedures
Page 30 Page 30 ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES ADJUSTMENT OF THE CUBE SIZE CAUTION. Before performing actual adjustment of the cube size, check other possible causes for cube size problems, refer to the Service Diagnosis Section for problem review and analysis. Do not perform any adjustment till the icemaking system has progressed SMALL... -
Page 31: Wiring Diagram 31÷34
Page 31 Page 31 WIRING DIAGRAM MXG 328 - 428 - 438 A-W 230/50/1... - Page 32 Page 32 Page 32 WIRING DIAGRAM MXG 638 A-W 230/50-60//1...
- Page 33 Page 33 Page 33 WIRING DIAGRAM MXG 638-938 A-W 400/50/3...
- Page 34 Page 34 Page 34...
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Page 35: Service Diagnosis
Shortage of water See remedies for shortage of water Dirty water supply Use water softner or water filter Accumulated impurities Use SCOTSMAN Ice Machine cleaner Shortage of water Water spilling out through curtain Check or replace curtain Water solenoid valve not opening... - Page 36 Page 36 Page 36 SERVICE DIAGNOSIS SYMPTON POSSIBLE CAUSE SUGGESTED CORRECTION Irregular cubes size & some Some jets plugged Remove spray bar & jet bearing cloudy and clean them Shortage of water See shortage of water Unit not level Level as required Spray bar not rotating Remove spray bar &...
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Page 37: Maintenance And Cleaning Instructions
Perform adjustment of DIP SWITCH keys Clean the water system, evaporators, bin as required. and spray bar/s using a solution of SCOTSMAN Ice Machine Cleaner. Check the ice level control sensor to test Refer to procedure C cleaning instructions and shut-off. -
Page 38: Cleaning Instructions Of Water System
Cleaning Mode (Fig.7) cleaning solution by diluting in a plastic container two or three liters of warm water (45°-50°C) with a 0,2-0,3 liters of SCOTSMAN Ice Machine Cleaner. WARNING. The SCOTSMAN Ice Machine Cleaner contains Phosphoric and Hydroxyacetic acids. - Page 39 Page 39 Page 39 14. Flush out the rinsing solution from the sump With the system in Cleaning mode the reservoirs water pump is the only component in operation to circulate the cleaning solution in the entire 15. Place again the evaporator cover and the water system unit service panels.
- Page 40 Page 40 Page 40 Sanitation 22. At completion of the freezing and harvest cycle make sure of proper texture and clearness of the ice cubes and that, they do not have any acid taste. NOTE. Sanitation of the water system is recommended to be done once a month.