Scotsman NM1852R Service Manual Download Page 11 | Manualshive

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FOR THE INSTALLER: Completed Installation

INSULATED

PRECHARGED

REFRIGERANT

TUBING

A typical installation should generally appear as
illustrated below. The remote condenser must be
located above the icemaker and the precharged
lines installed per the instructions on page 6.

NM1852R

December 1992

Page 11

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Summary of Contents for NM1852R

Page 1: ...ice and water level a thermostatic expansion valve and R 22 as the refrigerant TABLE OF CONTENTS For the Installer Specifications 2 Location 5 Remote Condenser 6 For the Plumber 9 For the Electrician 10 Final Check List 12 Start Up 13 Component Description 14 Operation 16 Maintenance Cleaning 21 Service Diagnosis 24 Removal and Replacement Water Reservoir Bin Controls 28 Thrust Bearing Breaker 29 ...

Page 2: ...5 20 84 Allow 6 above machine for service 15 53 21 3 1 3 1 4 5 9 43 17 8 18 8 There are two separate ice making and refrigeration systems in this model The liquid and discharge lines from each system must go to separate circuits in one remote condenser RC1222 The Standard Finish is Enamel Sandalwood There is an optional stainless steel panel kit SPKFM42 available to convert the unit to Stainless S...

Page 3: ... 1 Check with a water treatment specialist for a water test and recommendations regarding filters and treatment 2 In most cases the water used to make ice should be filtered or treated depending upon the water There is no one type of water filter that will be effective in all situations That is why a water test is important Scotsman Ice Systems are designed and manufactured with the highest regard...

Page 4: ...56 RT 2225 Precharged line set 25 R 22 2 required Or RT 2240 Precharged line set 40 R 22 2 required DIMENSIONS H X W X D MODEL USE WITH MINIMUM CIRC AMPACITY BASIC ELECTRICAL RC1222 27 8 X 22 X 37 94 1 NM1852R 2 208 230 60 1 Included with the ice maker s minimum circuit ampacity Use this value to determine wire size between icemaker and fan motor ICEMAKER NAMEPLATE LOCATED ON BACK PANEL SERIAL PLA...

Page 5: ...preparation for leveling later Return the bin to the upright position Install the bin top according to the directions with the bin top 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 mechanical lift is recommended for lifting the machine high enough to ins...

Page 6: ...a 3 8 inch diameter liquid line and a 1 2 inch diameter discharge line Both ends of each line have quick connect couplings one end has a schrader valve connection that end goes to the condenser Note The openings in the building ceiling or wall listed in the next step are the minimum sizes recommended for passing the refrigerant lines through 2 Have the roofing contractor cut a minimum hole for the...

Page 7: ...ther end of the liquid line to the icemaker fitting marked discharge line 4 Then using two wrenches it is important that ONLY the nut on the precharged lines be turned the other parts of the couplings must NOT be allowed to turn or the process will tear out the diaphragms and they will be loose in the refrigeration system tighten the coupling until it bottoms out or a definite increase in resistan...

Page 8: ...NSTALLER Location REMOTE CONDENSER EXCESS PRECHARGED TUBING INSIDE BUILDING ICEMAKER SERVICE ACCESS SERVICE ACCESS SIDE AND BACK ROOF CUTAWAY WALL CUTAWAY CONTACT ROOFING CONTRACTOR NM1852R December 1992 Page 8 ...

Page 9: ...e 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 Use only 3 4 rigid tubing Storage Bin A separate gravity type drain needs to be run Insulation of this drain line is recommended FLOOR DRAIN VENT BIN DRAIN 3 4 FPT VENT ICEMAKER D...

Page 10: ...the compressor and the fan motor operates whenever the compressor operates Electrical connections are made at the junction box at the back of the icemaker and at the junction box on the remote condenser The remote condenser must be wired to the icemaker in accordance with local and national electrical codes with a minimum of 18 Awg wire with an ground bonding wire connected to the ground screws pr...

Page 11: ...D PRECHARGED REFRIGERANT TUBING A typical installation should generally appear as illustrated below The remote condenser must be located above the icemaker and the precharged lines installed per the instructions on page 6 NM1852R December 1992 Page 11 ...

Page 12: ...er pressure a minimum of 20 psig 7 Has the machine been secured to the bin 8 Is there a water shut off valve installed near the machine 9 Is the remote condenser installed per local building codes and in a place where it has adequate ventilation and minimal solar heat gain 10 Has all shipping material and literature inside the front panel been removed from the units 11 Have the remote condenser an...

Page 13: ...n The electrical start up sequence is now on automatic A There should be a short 15 second delay before the gearmotor starts B After the gearmotor starts the liquid line valve will open the low pressure control will close and the compressor will start 5 The remote condenser fan turns and the condenser begins to discharge warm air 6 The unit should soon be making ice if desired the low side pressur...

Page 14: ...ne Ice Discharge Chute Directs the ice produced 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 An oil filled speed reduction gearbox driving the auger Cleaning Drain Tube When uncapped and lower...

Page 15: ... delay to clear the evaporator of ice when the unit turns off and for the liquid line valve Transformer Supplies low voltage to the circuit board Pump Down Control An automatic reset pressure switch connected to the low side of the refrigeration system Controls the compressor Potential Relay The compressor start relay On Off Switch Manual control for the machine CONTACTOR ON OFF SWITCH PUMP DOWN C...

Page 16: ...nless the ice stays between the sensors for more than 15 seconds bin full At that point the bin empty light goes out and the machine shuts down Shut Down consists of The liquid line solenoid closes lowering the suction pressure The pump down control opens The compressor contactor opens The compressor and fan motor stop unless the other ice making system is on then the fan motor stays ON The auger ...

Page 17: ... the float valve The water them goes out the bottom of the reservoir tanks to the bottom of the evaporators Reservoir overflow or evaporator condensation is combined into a common drain line and routed to the drain ADJUSTMENT OF WATER LEVEL EVAPORATOR DRAIN WATER LEVEL EVAPORATOR ICE CHUTE DRAIN STRAINER WATER SCHEMATIC RESERVOIR WATER INLET NM1852R December 1992 Page 17 ...

Page 18: ...vaporator 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 sucti...

Page 19: ...th a small amount of discharge gas going into the receiver to maintain pressure until the head pressure is built back up to the rated gauge pressure of 220 psig At that pressure the valve opens up the liquid line from the condenser to the receiver LIQUID LINE VALVE THERMOSTATIC EXPANSION VALVE SUCTION LINE KING VALVE Refrigeration Schematic COMPRESSOR RECEIVER HEAD PRESSURE CONTROL VALVE LIQUID LI...

Page 20: ...w is stopped by the closed liquid line valve This action forces the refrigerant into the receiver and keeps it out of the compressor The pump down continues until the low pressure control turns the compressor off REMOTE CONDENSER EVAPORATOR DISCHARGE LINE LIQUID LINE HEAD PRESSURE CONTROL VALVE RECEIVER COMPRESSOR Refrigeration Schematic KING VALVE SUCTION LINE THERMOSTATIC EXPANSION VALVE LIQUID ...

Page 21: ...O 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 solution should be between 90 and 115 degrees F 8 Slowly pour the cleaning solution into the water reservoir until it is...

Page 22: ...d at least two times per year Check the breaker bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed unscrewing the breaker cover left hand thread unscrewing the auger stud Inspect the assembly looking for wear 4 Clean the remote condenser Use a vacuum cleaner or coil cleaner if needed Do NOT use a wire brush 5 Check and tighten all bolts and screws MAINTENANCE ...

Page 23: ...nt For more information on removal and replacement of these parts see REMOVAL AND REPLACEMENT Shut off water and electrical supply 1 To remove the auger remove the front and top panels 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 screws holding brea...

Page 24: ...n secure to the fan motor shaft b Check the head pressure control valve it should be maintaining a head pressure above 220 psig If the unit has the correct charge and the condenser is clean and the refrigerant lines are not kinked or twisted and the condenser is not overheated by external heat loads the head pressure should be under the trip out point of the head pressure control switch If all of ...

Page 25: ...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 no water light is ON check the water level sensor a C...

Page 26: ...he machine b Check for low charge add some refrigerant if the unit begins to operate normal low side pressure being about 25 psig stop and look for a leak recover repair replace the drier evacuate and weigh in the nameplate charge If with added charge the unit does not operate Check for a restricted system recover replace the drier evacuate and weigh in a nameplate charge Check for a Thermostatic ...

Page 27: ...ay 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 insulation has failed replace the evaporator or add extra insulation in the form of foam tape to the evaporator C Check the compressor 1 The compressor may be inefficient a Check the amp draw if...

Page 28: ...maker 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 Reverse to rea...

Page 29: ...lding 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 only...

Page 30: ...r cover from breaker left hand threads b Unscrew auger stud from top of auger c Unscrew 4 allen head cap screws holding breaker to evaporator d Lift up on breaker to remove from auger 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 a The auger body It should be clean...

Page 31: ... 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 mounted 5 Carefully push the water seal rubber side against the auger sh...

Page 32: ... be sure that the number of shims indicated on the gear case cover is in place between the gearcase cover and the drip pan gasket Torque the bolts to 110 inch pounds 2 Lower the auger into the evaporator barrel slightly turning it to match up with the drive end Do Not Drop Into the Evaporator 3 Complete the reassembly by reversing the disassembly for the breaker thrust bearing assembly REMOVAL AND...

Page 33: ...o cases apart B To lift off the cover lift up until you can feel internal contact then pull the cover towards the output gear end and then lift the cover with drive motor attached up and away from the gear motor case Note The case cover output gear bearings and shaft are one pressed together assembly The oil quantity is 14 fluid ounces do not overfill OUTPUT GEAR OUTPUT SHAFT AND BEARINGS DRIVE MO...

Page 34: ...tsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700 88 Reclaim programs are available through most refrigerant wholesalers Use conservation minded service procedures Refrain from checking refrigeration pressures without reason There are many ways to determine the proper operation of a Scotsman ice machine without using refrigerant gauges Visual inspection of th...

Page 35: ...t inspection shows that the water level in the reservoir is above the top of the water level sensor OR the BIN EMPTY indicator is off while inspection shows that 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...

Page 36: ...ircuit board should go ON If the Bin Empty light is ON wait 10 20 seconds for the machine to start if the machine starts replace the ice level sensors If the Bin Empty light does not come ON the circuit board should be replaced LIGHT ON WATER SENS SWITCH TO NO WATER LIGHT OFF SWITCH TO WATER CIRCUIT BOARD TESTING NM1852R December 1992 Page 36 ...

Page 37: ...ight on the circuit board should go ON If not 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 NM1852R December 1992 Page 37 ...

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