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OPERATION: Refrigeration

Beginning at the compressor, the refrigerant
502 is compressed into a high temperature
gas.  The discharge line directs this gas to the
condenser.  At the condenser (air or water
cooled) the gas is cooled by either air or water
and it then condenses into a liquid.  This high
pressure liquid then goes through the liquid
line to the expansion valve.  The thermostatic
expansion valve meters liquid refrigerant into
the evaporator, the volume of liquid refrigerant
depending upon the temperature of the
evaporator; warmer evaporators get more
refrigerant and colder evaporators get less.

At the evaporator, the refrigerant enters an
area of relatively low pressure, where it can
easily "boil off" or evaporate. As it
evaporates, it absorbs heat from the
evaporator and whatever is in contact with it
(such as the water inside it). After the
evaporator, the refrigerant, now a low
pressure vapor, goes through the suction line
back to compressor, where the cycle is
repeated.

AIR COOLED

CONDENSER

DISCHARGE

LINE

FAN MOTOR

LIQUID LINE

COMPRESSOR

EVAPORATOR

THERMOSTATIC

EXPANSION

VALVE

SUCTION LINE

REFRIGERATION SYSTEM SCHEMATIC

FM1500

February, 1989

Page 15

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Содержание FM1500

Страница 1: ...nd water level a thermostatic expansion valve and R502 as the refrigerant TABLE OF CONTENTS For the Installer Specifications 2 Location 3 Stacking 5 For the Plumber 6 For the Electrician 7 Final Check List 8 Start Up 9 Component Description 10 Electrical Sequence 13 Operation 14 Maintenance Cleaning 16 Service Diagnosis 19 Removal and Replacement Water Reservoir Bin Control 23 Thrust Bearing and B...

Страница 2: ...Correct Bin Correct Ice Machine Correct Bin Top if required All kits legs and information required for the specific job SPECIFICATIONS ICEMAKER Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code MODEL FM1500AE 32A FM1500WE 32A FM15000AE 3A FM1500WE 3A DIMENSIONS without bin H x W x D 27 x 30 x 24 same same same 90 70 ICE CAPACITY 1000 lbs same same same COM...

Страница 3: ...one that filters out suspended solids to a dimension of 5 microns or smaller The finer the filter the better but finer filters will clog sooner than course ones It may be necessary to add a course filter ahead of the fine filter to prolong filter life 2 Check with a water treatment specialist for a water test and recommendations regarding filters and treatment Scotsman Ice Systems are designed and...

Страница 4: ...es in the bottom of the bin Turn the leg levelers all the way in preparation for leveling later Return the bin to the upright position remove paper covering the bin gasket Install bin top if required Note Do not push bin into position but lift it there Pushing a bin especially one with ice in it can cause damage to the legs and the leg mounts Ice Maker The machine is heavy so the use of a mechanic...

Страница 5: ... pin plug onto the ice machine circuit board socket marked LED CX2 B Plug the 3 pin plug onto the ice machine circuit board socket marked Photo Trans CX4 12 Unplug the wire harness connecting the transformer to the ice machine circuit board and remove from the machine then A Plug the 4 pin plug into the ice machine circuit board socket marked power CX1 B Connect the two free wires from the 4 pin p...

Страница 6: ...e back of the cabinet the drain line is of the gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing There should be a vent at the highest point of the drain line and the ideal drain receptacle would be a trapped and vented floor drain Water Cooled Models In addition to the above mentioned drain a separate condenser drain must be installed Connect it to the 1 2 conden...

Страница 7: ...res a solid chassis to earth ground wire The ice maker should be connected to its own electrical circuit so it would be individually fused Voltage variation must remain within design limitations even under starting conditions All external wiring must conform to national state and local electrical codes The use of a licensed electrician is required to perform the electrical installation THIS UNIT M...

Страница 8: ...or leaks 4 Has the machine and bin been leveled 5 Is there a minimum of 6 clearance at the rear left and right of the machine for proper service access and air circulation 6 Is the water pressure a minimum of 20 psig 7 Has the machine been secured to the bin 8 If stacked has the stacking kit been installed 9 Is there a water shut off valve installed near the machine 10 Have the shipping blocks bee...

Страница 9: ...drain 5 The unit should soon be making ice if desired the low side pressure can be checked it should be 30 psig or 4 psig The suction line temperature at the compressor is normally very cold nearly to the point of frost up to the compressor body but not on it The air cooled discharge pressure will depend upon air and water temperatures but should be between 200 psig and 280 psig For example with a...

Страница 10: ...r Senses if there is water in the reservoir to make ice out of Will shut the machine off it there is none Ice Discharge Chute Directs the ice made by the evaporator into the storage bin Ice Level Sensor An electronic eye it senses the presence of ice in the bottom of the ice discharge chute Operates to turn the ice machine on and off automatically as the level of ice in the bin changes Gear Motor ...

Страница 11: ... to the circuit board Low Pressure Control Cut Out A manual reset control to shut off the ice machine when the low side pressure drops below a preset point 0 4 psig Potential Relay The compressor start relay On Off Switch Manual control for the machine Reset Switch Manual reset Glows when the unit shuts off from the ice discharge chute being overfilled pressure of the ice opening the microswitch a...

Страница 12: ...l faces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Breaker Where the ice is compressed and much of the extra water is squeezed out of it before it is discharged into the bin Motor A permanent split capacitor motor that drives the gear reducer Bearing As the ice is pushed up the evaporator the auger is thrust down and pressure from the a...

Страница 13: ...he evaporator and then The auger motor relay opens and the auger motor stops If the ice level sensor is clear bin empty for more than 15 seconds the machine will start up again Another purpose of the circuit board is to turn the machine off if there is not enough water in the machine When the water level in the reservoir falls below the water level sensor the machine will shut down When the water ...

Страница 14: ...m of the evaporator Reservoir overflow or evaporator condensation is routed to the drain Water cooled models have a separate water circuit for the cooling water it enters the fitting at the rear goes to the water regulating valve then to the water cooled condenser and then down the drain WATER SCHEMATIC RESERVOIR STRAINER DRAIN EVAPORATOR DRAIN ADJUSTMENT OF WATER LEVEL EVAPORATOR ICE CHUTE WATER ...

Страница 15: ... depending upon the temperature of the evaporator warmer evaporators get more refrigerant and colder evaporators get less At the evaporator the refrigerant enters an area of relatively low pressure where it can easily boil off or evaporate As it evaporates it absorbs heat from the evaporator and whatever is in contact with it such as the water inside it After the evaporator the refrigerant now a l...

Страница 16: ...c 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 Physician immediately In case of external contact flush with water KEEP OUT OF THE REACH OF CHILDREN 7 Prepare the cleaning solution Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water The water should be between 90 115...

Страница 17: ... should also be checked at least two times per year Check the bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed using a spanner wrench and unscrewing the breaker cover unscrewing the auger stud Inspect the assembly looking for wear See Removal and Replacement to replace bearing or seals Reverse to reassemble 4 Clean or replace the air cooled condenser filter ...

Страница 18: ... top panel If top panel cannot be removed or if there is less than 6 clearance over the top of the machine the gearmotor evaporator may be slid out for service access See Removal And Replacement 2 Remove 3 hex studs holding ice chute cover to ice chute and remove cover 3 Unscrew and remove ice sweep 4 Loosen band clamp under ice chute and remove ice chute from evaporator 5 Remove 4 allen head scre...

Страница 19: ...rge E Check the high pressure cut out if closed go to F if open check 1 The pressure control opens at 450 psig Check the high side pressure reset the control and observe on water cooled that water soon begins to flow from the condenser drain or on air cooled that the fan is forcing air through the condenser If the unit trips out on pressures below 450 psig replace the control If the pressures rise...

Страница 20: ... full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin empty light on the circuit board should go ON If not replace the circuit board If it does as above and the machine still does not run replace the ice level sensors 3 If the transformer is fine and the...

Страница 21: ...is open replace the contactor 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no power and all of the above switches have been checked replace the centrifugal switch or the drive motor 4 If the compressor relay on the circuit board has power on the NO contact but not on the COM contact replace the circuit board B Check the compre...

Страница 22: ...ter leaks replace the water seal if found to be leaking 3 Check the low side pressure normal is about 30 psig If low assume a refrigerant leak locate repair and recharge If no leak the TXV may be restricted defective or not adjusted properly If needed replace the TXV evacuate and recharge per nameplate 4 Check the insulation on the evaporator It should be dry with no wet spots or frost If the insu...

Страница 23: ... from icemaker 8 Reverse to reassemble BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the chute in front of and behind it are two plastic bin control mounts 5 Slide each bin control to the left and in the control box disconnect the electrical leads connecting the bin control to the circuit board 6 Rever...

Страница 24: ...holding breaker to evaporator d Lift up and remove breaker bearing assembly from auger evaporator 6 Service the bearing Check for rust rough spots and damage a The bearing is pressed into the breaker to remove the bearing and replace it an arbor press is needed b Replace lower seals before installing new bearing in breaker Note seals must be pressed in with a tool pushing against the outer edge on...

Страница 25: ...len head cap screws holding breaker to evaporator d Lift up and remove breaker from evaporator e If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole The size of that hole is 5 8 18 Inspect the auger the critical areas of the auger are 1 The auger body It should be clean and shining Sometimes an auger will appear clean when wet but after it is dry it will ...

Страница 26: ...past the grove for the snap ring 2 Replace the snap ring and pull the water seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from the auger and clean the mounting area 4 Place a small bead of food grade silastic sealant such as 732 RTV or Scotsman part number 19 0529 01 on the area of the auger where the water seal is to be mou...

Страница 27: ...until dehydrated then weigh in the nameplate charge Check for leaks 8 Install auger breaker breaker bearing assembly and ice discharge chute in reverse order of disassembly See To Reassemble Evaporator and Auger To Reassemble the Evaporator and Auger 1 After the gearmotor has been inspected fasten the evaporator to the gear motor be sure that the number of shims indicated on the gear case cover is...

Страница 28: ...rusty bearings and gears the oil having a creamy white appearance oil level too high carefully inspect the bearings and gears If in doubt about the condition of a part replace it The oil quantity is 16 fluid ounces do not overfill Note The gears and bearings are available only as pressed together sets D After replacing parts as required if any reassemble the gearcase The two smaller gears and the ...

Страница 29: ...LACEMENT Gearmotor WATER SHED SEAL CENTRIFUGAL SWITCH DRIVE MOTOR BEARING SEAL 1ST GEAR AND BEARINGS GASKET GEARCASE 2ND GEAR AND BEARINGS GEARCASE COVER BEARINGS OUTPUT GEAR OUTPUT SHAFT FM1500 February 1989 Page 29 ...

Страница 30: ...hat the ice level sensors are properly aligned clean and not obstructed use the tester as follows Bin Control Note All testing is done with the electrical power on the master switch on and all reset switches reset 1 Unplug photo trans and LED connectors from the circuit board 2 Plug photo trans and LED connectors from the tester into the circuit board a Move the bin full switch on the tester to Fu...

Страница 31: ...ot replace the circuit board b Move the water switch on the tester to the Water position The No Water light on the board should go OFF If not replace the circuit board If the light does go off replace the water level sensor If the Bin Empty light is ON wait 10 20 seconds for the machine to start The machine should start CIRCUIT BOARD TESTING WATER SENS LIGHT ON SWITCH TO NO WATER LIGHT OFF SWITCH ...

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