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Page 30

OPERATION - CONTROL SEQUENCE

At the start of freezing cycle the evaporator
temperature sensor controls the length of the first
part of the freezing cycle. As it reaches a
predetermined temperature it supplies a low
voltage current to the P.C. BOARD in order to
activate the electronic timer which takes over the
control of the freezing cycle for a pre-fixed time
according to the DIP SWITCH keys setting
(see Tab. B).

NOTE. The evaporator temperature sensor,
factory pre-set, is the same for all the models
and is not adjustable in the field.

Once completed the timed portion of the freezing
cycle the system goes automatically into the
defrost cycle which has also a pre-fixed length. At
completion of the defrost cycle the P.C. BOARD
command the unit to start again a new freezing
cycle.

OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches and
which components are ON or OFF during a
particular phase of the icemaking cycle.
Refer to the wiring diagram for a reference.

BEGINNING FREEZE

Electrical components (Loads)

OFF

Compressor ...........................................

•

Fan Motor (Air cooled only) and TRIAC ........

•

Hot Gas Valve ........................................

•

Water Inlet Valve ....................................

•

Water Drain Valve ..................................

•

P.C.Board Relay 1 Coil ..........................

•

P.C.Board Relay 2 & 3 Coil ....................

•

Water Pump ...........................................

•

Contactor Coil (EC 125-175 only) ..........

•

P.C.B. Timer ...........................................

•

Elctronic Controls & Sensors

OFF

Evaporator Sensor .................................

•

Condenser Sensor .................................

•

Ice Level Control ....................................

•

TIMED FREEZE

Electrical components (Loads)

OFF

Compressor ............................................

•

Fan Motor (Air cooled only) and TRIAC ........

•

Hot Gas Valve ........................................

•

Water Inlet Valve ....................................

•

Water Drain Valve ..................................

•

P.C.Board Relay 1 Coil ..........................

•

P.C.Board Relay 2 & 3 Coil ....................

•

Water Pump ...........................................

•

Contactor Coil (EC 125-175 only) ..........

•

P.C.B. Timer ...........................................

•

Electronic Controls & Sensors

OFF

Evaporator Sensor .................................

•

Condenser Sensor .................................

•

Ice Level Control ....................................

•

HARVEST (Drain portion - first 15 sec.)

Electrical components (Loads)

OFF

Compressor ............................................

•

Fan Motor (Air cooled only)and TRIAC .........

•

Hot Gas Valve ........................................

•

Water Inlet Valve ....................................

•

Water Drain valve ...................................

•

P.C.Board Relay 1 & 2 Coil ....................

•

P.C.Board Relay 3 Coil ...............................

•

Water Pump ...........................................

•

Contactor Coil (EC 125-175 only) ..........

•

P.C.B. Timer ...........................................

•

Electronic Controls & Sensors

OFF

Evaporator Sensor .................................

•

Condenser Sensor .................................

•

Ice Level Control ....................................

•

HARVEST (Water filling portion)

Electrical components (Loads)

OFF

Compressor ............................................

•

Fan Motor (Air cooled only)and TRIAC .........

•

Hot Gas Valve ........................................

•

Water Inlet Valve ....................................

•

Water Drain valve ...................................

•

P.C.Board Relay 1 & 2 Coil ....................

•

P.C.Board Relay 3 Coil ...............................

•

Water Pump ...........................................

•

Contactor Coil (EC 125-175 only) ..........

•

P.C. Board Timer ...................................

•

Electronic Controls & Sensors

OFF

Evaporator Sensor .................................

•

Condenser Sensor .................................

•

Ice Level Control ....................................

•

Содержание EC 105

Страница 1: ...Page 1 Page 1 SERVICE MANUAL EC 45 EC 55 EC 85 EC 105 EC 125 EC 175 Electronic cubers with storage and PWD system MS 1000 81 REV 06 2002 ...

Страница 2: ...ons Final check list Installation practice OPERATING INSTRUCTIONS Start up Operational checks OPERATING PRINCIPLES How it works Freezing cycle Harvest cycle Control sequence Component description ADJUSTMENT REMOVAL AND REPLACEMENT PROCEDURES Adjustment of the cube size Wiring diagram EC 45 55 85 105 Wiring diagram EC 125 175 Service diagnosis MAINTENANCE AND CLEANING INSTRUCTIONS General Icemaker ...

Страница 3: ...2 C 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 CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on page 41 of this manual MAX 40 C 40 C 5 bar 10 ice making capacity 24 23 22 21 20 19 18 17 16 15 K g 32 27 21 15 10 AIR COOLED MODELS WATER TEMPERAT...

Страница 4: ... Water req the cold store lt 24 HR Model Cond unit Finish Comp HP SPECIFICATIONS Basic electr Amps Watts Nr of wires Amps fuse 230 50 1 2 2 11 340 6 5 3 x 1 5 mm2 10 100 270 EC 45 CUBER machine specifications Cubes per harvest 18 medium A 15 C water temperature Dimensions HEIGHT 725 mm WIDTH 457 mm DEPTH 480 mm WEIGHT 39 Kgs ...

Страница 5: ...imum of 10 at room temperatures higher than 32 C 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 CUBER at peak performance levels periodic maintenance checks must be carried out as indicated on page 41 of this manual C F 32 30 28 26 24 22 20 18 K g 32 27 21 15 10 10 21 32 38 C o C o 32 30 28 26 ...

Страница 6: ...y Water req the cold store lt 24 HR Model Cond unit Finish Comp HP SPECIFICATIONS Basic electr Amps Watts Nr of wires Amps fuse 230 50 1 2 2 11 390 7 3 x 1 5 mm2 10 0110 290 EC 55 CUBER machine specifications Cubes per harvest 24 medium A 15 C water temperature Dimensions HEIGHT 738 mm WIDTH 457 mm DEPTH 522 mm WEIGHT 44 Kgs ...

Страница 7: ...levels periodic maintenance checks must be carried out as indicated on page 41 of this manual Important operating requirements MIN MAX Air temperature 10 C 50 F 40 C 100 F Water temperature 5 C 40 F 40 C 100 F Water pressure 1 bar 14 psi 5 bar 70 psi Electr voltage variations from voltage rating specified on nameplate 10 10 ice making capacity 40 38 36 34 32 30 28 26 Kg 32 C AIR COOLED MODELS WATE...

Страница 8: ...ater req the cold store lt 24 HR Model Cond unit Finish Comp HP SPECIFICATIONS Basic electr Amps Watts Nr of wires Amps fuse 230 50 1 3 2 17 500 10 3 x 1 5 mm2 10 0140 380 EC 85 CUBER machine specifications Cubes per harvest 24 medium A 15 C water temperature Dimensions HEIGHT 738 mm WIDTH 457 mm DEPTH 522 mm WEIGHT 44 Kgs ...

Страница 9: ...iodic maintenance checks must be carried out as indicated on page 41 of this manual Important operating requirements MIN MAX Air temperature 10 C 50 F 40 C 100 F Water temperature 5 C 40 F 40 C 100 F Water pressure 1 bar 14 psi 5 bar 70 psi Electr voltage variations from voltage rating specified on nameplate 10 10 ice making capacity 50 48 46 44 42 40 38 36 34 32 30 K g 32 C AIR COOLED MODELS WATE...

Страница 10: ...8 550 10 3 x 1 5 mm2 10 Cubes per harvest 32 medium At 15 C water temperature Model Cond Finish Comp HP Ice bin cap Water requirem Kgs LTx24 HR EC 105 AS Air S Steel 180 3 8 18 EC 105 WS Water S Steel 530 FRONT VIEW HEIGHT without legs 813 mm HEIGHT with legs 950 mm WIDTH 535 mm DEPTH 534 mm WEIGHT 44 Kgs EC 105 CUBER machine specifications ...

Страница 11: ...nce levels periodic maintenance checks must be carried out as indicated on page 41 of this manual Important operating requirements MIN MAX Air temperature 10 C 50 F 40 C 100 F Water temperature 5 C 40 F 40 C 100 F Water pressure 1 bar 14 psi 5 bar 70 psi Electr voltage variations from voltage rating specified on nameplate 10 10 ice making capacity 75 70 65 60 55 50 45 Kg 32 C 27 21 15 10 AIR COOLE...

Страница 12: ...3 x 1 5 mm2 10 Cubes per harvest 36 large 48 medium 84 small At 15 C water temperature Ice bin cap Water requirem Kgs LTx24 HR EC 125 AS Air S Steel 160 1 2 28 EC 125 WS Water S Steel 680 Model Cond Finish Comp HP FRONT VIEW HEIGHT without legs 900 mm HEIGHT with legs 1020 mm WIDTH 675 mm DEPTH 520 mm WEIGHT 75 Kgs EC 125 CUBER machine specifications ...

Страница 13: ...7 5 87 5 Kg 32 10 C WATER TEMPERATURE AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS C 10 21 10 21 32 38 27 21 15 85 82 5 80 77 5 75 72 5 70 67 5 65 90 92 5 95 SPECIFICATIONS ELECTRONIC CUBER MODEL EC 175 NOTE With the unit in built in conditions the ice production is gradually reduced in respect to the levels shown in the graf up to a maximum of 10 at room temperatures higher than 32 C The daily ice...

Страница 14: ...18 3 x 1 5 mm2 16 Cubes per harvest 36 large 48 medium At 15 C water temperature Ice bin cap Water requirem Kgs LTx24 HR EC 175 AS Air S Steel 0160 3 4 28 EC 175 WS Water S Steel 1000 Model Cond Finish Comp HP FRONT VIEW HEIGHT without legs 900 mm HEIGHT with legs 1020 mm WIDTH 675 mm DEPTH 520 mm WEIGHT 75 Kgs EC 175 CUBER machine specifications ...

Страница 15: ...to rear directions D ELECTRICAL CONNECTIONS See data plate for current requirements to determine wire size to be used for electrical connections All SCOTSMAN icemakers require a solid earth wire A INTRODUCTION This manual provides the specifications and the step by stepproceduresfortheinstallation start up and operation maintenance and cleaning for the SCOTSMAN EC series icemakers The Electronic C...

Страница 16: ...rplumbing fitting and a shut off valve installed in an accessible position between the water supply line and the unit If water contains a high level of impurities it is advisable to consider the use an appropriate water filter or conditioner Water Cooled Versions EC 45 55 85 105 On Water Cooled version the water inlet solenoid valve has two separate outhets one for the condenser and the second for...

Страница 17: ...ugly fitted onto the mounting pads 9 Have the bin liner and cabinet been wiped clean 10 Has the owner user been given the User Manualandbeeninstructedontheimportanceof periodic maintenance checks 11 Has the Manufacturer s registration card been filled in properly Check for correct model and serial number against the serial plate and mail the registration card to the factory 12 Hastheownerbeengiven...

Страница 18: ...ents energized are THE WATER INLET SOLENOID VALVE THE HOT GAS SOLENOID VALVE THE WATER DRAIN SOLENOID VALVE NOTE If in the 5 minutes lenght of the water filling phase the machine sump reservoir does not get filled with water up to the rim of the overflow pipe it is advisable to check 1 The water pressure of the water supply line thatmustbeatleast1bar 14psig Minimum Max 5 bar 70 psig 2 The filterin...

Страница 19: ...r into the sump tank D At completion of the water filling phase 5 minutes the unit passes automatically into the freezing cycle with the start up of COMPRESSOR CONTACTOR COIL EC 125 175 only WATER PUMP FANMOTOR inaircooledversion controlledby thecondensingtemperaturesensorlocatedwithin the condenser fins Fig 2 OPERATIONAL CHECKS E Install if required the refrigerant service gauges on both the high...

Страница 20: ...12 Rx Tx WATER IN VALVE HOT GAS VALVE CONTACTOR COIL FAN MOTOR WATER PUMP EVAPORATOR AMBIENT CONDENSER TEMPERATURE SENSORS BIN COMPRESSOR TRANSF DATA PROCESSOR ELECTR TIMER DIP SWITCH ELECTRONIC CARD L N RELAYS RELAY TRIAC WATER DRAIN VALVE FIG 4 16 15 14 13 2 1 7 8 9 10 3 4 5 6 11 12 Rx Tx WATER IN VALVE HOT GAS VALVE CONTACTOR COIL FAN MOTOR WATER PUMP EVAPORATOR AMBIENT CONDENSER TEMPERATURE SE...

Страница 21: ...e shown the various time extensions of the freezing cycle second phase in relation with the different DIP SWITCH keys setting H After about 17 20 minutes from the begin ning of the freezing cycle in an hypothetic ambient temperature of 21 C the defrost cycle takes place with the hot gas the water inlet and the water drain valves simoultaneously activated Fig 5 Theelectricalcomponentsinoperationonm...

Страница 22: ...pplied water requires the use of an appropriate water filter or conditioner L To be sure of the correct operation of ice level control device place one hand between its sensing eyes to interrupt the light beam The Bin Full YELLOW LED starts to blink and after 60 seconds the unit stops with the simultaneous glowing of the same LED to moni tor the BIN FULL situation Fig 6 Take the hand out from the ...

Страница 23: ...ctor it is advisable to locate the unit where it is not reached by any direct light beam or light radiation also it is recommended to keep the bin door constantly closed and to follow the instructions for the periodical cleaning of the light sensor elements as detailed in the MAINTENANCE AND CLEANING PRO CEDURES ItssensivitycanbeadjustedbyturningtheIR trimmer M Remove if fitted the refrigerant ser...

Страница 24: ...voltage current 15 volts to flow to the P C BOARD which in turn activates an electronic timer The timer which is built in the P C BOARD takes over from the evaporator temperature sensor the control of the freezing cycle up to its completion NOTE The change of the electric potential oftheevaporatorsensorwiththeconsequent activation of the timer Time mode is signalled by the glowing up of the RED LE...

Страница 25: ...Page 25 Page 25 FIG A FIG B FIG C FIG D ...

Страница 26: ...Page 26 Page 26 FIG E FIG F FIG G FIG H ...

Страница 27: ...ength of the freezing cycle ranges from 20 to 25 minutes DEFROST OR HARVEST CYCLE Fig E and G As the electronic timer has carried the system throughout the second phase of freezing cycle the defrost cycle starts ATTENTION In case the unit is able to reach0 C 32 F evaporatingtemperature within 15 minutes but after 45 minutes from the beginning of the freezing cycle it has not yet reached the evapor...

Страница 28: ...oir reaches the maximum level the two metal pins close the electrical contact through the water transmitting a low voltage current to the Special Interface PC Board The interface PC Board activates the Water Drain Pump for 8 seconds pumping out most PWD SYSTEM of the water contained into the Sealed Water Reservoir The water can be pumped out up to 1 5 m rise or to 30 m on horizontal length POWER W...

Страница 29: ... with a trimmer that can be adjusted accordingly to the different electrical conductivity of the water TRIMMER WATER SENSIVITY SCHEMATIC SYSTEM Drain out Storage bin Purge valve Storage bin drain tube Overflow drain tube Purge valve drain tube Water tank inlet fitting Sealed water tank Water pump Check valve Drain fitting Vented tube Water level sensors ...

Страница 30: ...C Hot Gas Valve Water Inlet Valve Water Drain Valve P C Board Relay 1 Coil P C Board Relay 2 3 Coil Water Pump Contactor Coil EC 125 175 only P C B Timer Elctronic Controls Sensors ON OFF Evaporator Sensor Condenser Sensor Ice Level Control TIMED FREEZE Electrical components Loads ON OFF Compressor Fan Motor Air cooled only and TRIAC Hot Gas Valve Water Inlet Valve Water Drain Valve P C Board Rela...

Страница 31: ...g cycle the evaporating temperature have not yet reached the value of 0 C 32 F small Red LED OFF the P C Board switches OFF the machine with the BLINKING of WARNING RED LED B CONDENSERTEMPERATURESENSOR The condenser temperature sensor probe located within the condenser fins air cooled version or in contact with the tube coil water cooled version detects the condenser tempe rature variations and si...

Страница 32: ...the other at low voltage integrated with two fuses one on power in 32mA and one on power out 6 3 A of four aligned LEDS monitoring the operation of the machine of one extra monitoring RED LED blink 0 C steady 15 C of one DIP SWITCH with ten keys of one push button of input terminals for the leads of the sensor probes and input and output terminals for the leads of the ice maker electrical wires Th...

Страница 33: ...5 30 6 90 12 6 15 6 The 7th D S key is not used in this release of the P C BOARD The 8th key allows the operation of the water pump even during the defrost cycle as required when it is necessary to drain out the remaining water from the sump The 9th key is used to supply power to the water pumpforthefirst15secondsofthedefrostcycle position OFF or for the first 30 seconds position ON The 10th key i...

Страница 34: ...id valve electrically connected in parallel to the water inlet and to the hot gas solenoid valves is energized for all the length of the defrost cycle By means of the water pump that remains energized for 15 seconds at the beginning of the defrostcycle itallowsthedrainoutofallremaining water rich of minerals deposited during the previous freezing cycle from the sump tank By doing so it allows to t...

Страница 35: ...heckthecorrisponding length of freezing cycle 2nd phase on Table B 3 Set the same DIP SWITCH KEYS to correspond to the prior combination shown on Table B which allow an extention of two more minutes of the length of the freezing cycle 4 Observe the ice cubes in the next two harvests and eventually repeat steps 2 and 3 above until proper ice cubes size is achieved See figure II Ifthecubesareoversiz...

Страница 36: ...Page 36 Page 36 WIRING DIAGRAM EC 45 55 85 105 AIR WATER COOLED 230 50 60 1 ...

Страница 37: ...Page 37 Page 37 WIRING DIAGRAM EC 125 175 AIR WATER COOLED 230 50 60 1 ...

Страница 38: ...ort of refrigerant Compressor cycles intermittently Freezing LED Red alarm LED glow Condenser sensor out of order Replace it Freezing LED Red alarm LED blink Evaporator sensor out of order Replace it Compressor cycles intermittently Low voltage Check circuit for overloading Check voltage at the supply to the building If low contact the power company Contactor with burnt contacts Replace it EC 125 ...

Страница 39: ...e system Poor air circulation or excessive Relocate the unit or provide for hot location Red alarm LED glows more ventilation Overcharge of refrigerant Correct the charge Purge off slowly Capillary tube partially restricted Blow charge add new gas drier after evacuating system with vacuum pump Hot gas solenoid valve leaking Replace valve Short of refrigerant Charge to data plate indication Dischar...

Страница 40: ...ng Replace valve Water solenoid valve not opening Valve coil with open winding Replace valve Incorrect discharge pressure Inoperative condenser sensor Replace sensor Inoperative P C Board Replace P C Board Water regulating valve misadjusted Adjust its setting stem EC 125 175 only Excessive water in unit base Water tubing leaking Check Tighten or replace SERVICE DIAGNOSIS ...

Страница 41: ...r operation Continuous check of the clarity of ice cubes and visual inspection of the water spraying parts before and after cleaning will indicate frequency and proce dure to be followed in local areas 4 With the ice machine and fan motor OFF on aircooledmodels cleancondenserusingvacuum cleaner whiskbroomornonmetallicbrushtaking care to do not damage both the condenser and ambient temperature sens...

Страница 42: ...5 50 C witha0 2litersofSCOTSMANIceMachine Cleaner WARNING The SCOTSMAN Ice Machine Cleaner contains Phosphoric and Hydroxyacetic acids These compounds are corrosive and may cause burns if swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physicianimmediately Incaseofexternal contact flush with water KEEP OUT OF THE REACH OF CHILDREN 4 Scoop out all the ice cubes stored into...

Страница 43: ... then plug in again NOTE The ice maker will perform the 5 minutesWATERFILLINGphasei e thewater inlet solenoid valve opens to allow the incoming water to rinse again the water system and to properly fill up the sump reservoir for the next freezing cycle Sanitation NOTE Sanitation of the water system is recommended to be done once a month 11 Prepare in a plastic container the sanitation solution as ...

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