Service Manual - MAR1400 and MAR2000

MAR1400 & MAR2000IntroductionThis is the manual for the SCOTSMAN MARSPLIT UNITS models MAR1400 and MAR2000.They are designed to operate only with freshwater. Table of ContentsSpecifications · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2MAR1400 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 4MAR2000 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5General information · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 6Complete System Installation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 7Condensing Unit Component Control Devices · · · · · · · · · · · · · · · · · · · · · · · · 8Location Consideration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9Installation Diagrams · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10Water Circuit · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 11Installation · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12Bin Thermostat · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 13Component Assembly · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 14Electrical Connection · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 15Multiple Installations · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 16Testing · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 17Start-Up · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 18Electrical Sequence: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 19Water and Refrigeration Schematics · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 20MAR Split - Electrical / Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 22Adjustments · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 24Adjustment & Removal & Replacement Procedures · · · · · · · · · · · · · · · · · · · · · 25Adjustment & Removal & Replacement Procedures · · · · · · · · · · · · · · · · · · · · · 29Maintenance & Cleaning Instructions · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 30Cleaning Instruction · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 31Service Diagnosis · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 32Service Diagnosis · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 33 December 2000 Page 1

MAR1400 & MAR2000 MAR Unit, shown without chuteSpecificationsThe standard machine includes a stainless steelcabinet, a 230 volt, 60 Hz, single phase drivemotor, automatic expansion valve, heatexchanger, float reservoir, time delay switch, binthermostat, water pump, ice spout switch, liquidline solenoid valve, EPR valve and low waterpressure cut out.The condensing unit, interconnecting refrigeranttubes and electrical system must be supplied bythe purchaser as per the instructions given in thisservice manual.Take time now and read this manual whichcontains valuable information on the MAR SplitSystem. For any further questions regarding thecare or operation of the machine, please contactyour local Scotsman distributor or call1-800-533-6006.Basic SpecificationsModel Basic Electrical Maximum Fuse Size Minimum Circuit AmpacityMAR1400RL-32A 208-230/60/1 15 2MAR2000RL-32A 208-230/60/1 15 2 34 1/2\" Ice Machine Area 24 1/2\" Front Top view of unit and chute. Chute Area 10 \" 20 \" December 2000 Page 2

MAR1400 & MAR2000 A B C Ø1Water Ø2 Liquid Ø3 Suction Ø4 Drain Inlet Fitting Line Line 621 mm 876 mmMAR1400 876 mm (24.49”) (34.49”) ¾” Hose 3/8” ** 5/8” ** 21 mmOR (34.49”) CouplingMAR2000 Thread** Adapter shipped inside unit to go to 3/8” maleflare.** Line sizes may need to be larger, dependingupon length of run. December 2000 Page 3

MAR1400 & MAR2000 Suggested Condensing Unit Settings:MAR1400 HEAD PRESSURE SETTING • 15 Bar (218 PSIG) on air cooled and waterSet for Fresh water Operation cooled unitsIMPORTANT OPERATING REQUIREMENTS: LOW PRESSURE SETTING • 1.6 Bar (23 PSIG) on air cooled unitsWATER LEVEL IN DRUM RESERVOIR • 115-120 mm (4.5 to 4.75 inches) HI-PRESSURE CONTROL SETTING • 36 Bar (522 PSIG)DRUM ROTATING SPEED • 1.5 RPM (thick ice) LO-PRESSURE CONTROL SETTING • 2.3 RPM (thin ice) • 0.2 Bar (3 PSIG)REFRIGERANT: • R-404AREQUIRED CONDENSING CAPACITY • 4800 Kcal/h at -24EC Evap. Temp. (19,000 BTUH at -11oF)WATER PRESSURE CONTROL SETTING • 0.8 Bar (11 PSIG)MAX. WATER TEMPERATURE • 35 °C (95oF)MIN. WATER TEMPERATURE • 5 °C (41oF)MIN. WATER PRESSURE • 1 atm. (15 PSI)MAX. WATER PRESSURE • 5 atm. (75 PSI)MIN. AMBIENT TEMPERATURE • 5 °C (41oF)MAX. AMBIENT TEMPERATURE • 40 °C (104oF)MAX. VOLTAGE VARIATION • ± 10%December 2000 Page 4

MAR2000 MAR1400 & MAR2000Set for Fresh water Operation Suggested Condensing Unit Settings HEAD PRESSURE SETTINGIMPORTANT OPERATING REQUIREMENTS: • 15 Bar (218 PSIG) on air cooled and waterWATER LEVEL IN DRUM RESERVOIR cooled units • 115-120 mm (4.5 to 4.75 inches) LOW PRESSURE SETTINGDRUM ROTATING SPEED • 1.6 Bar (23 PSIG) on air cooled units • 2.4 RPM (thick ice) HI-PRESSURE CONTROL SETTINGREFRIGERANT: • 36 Bar (522 PSIG) • R-404A LO-PRESSURE CONTROL SETTINGREQUIRED CONDENSING CAPACITY • 0.2 Bar (3 PSIG) • 6500 Kcal/h at –24oC Evap. Temp (26,000 BTUH at –11oF.)WATER PRESSURE CONTROL SETTING • 0.8 Bar (11 PSIG)MAX. WATER TEMPERATURE • 35 °C (95oF)MIN. WATER TEMPERATURE • 5 °C (41oF)MIN. WATER PRESSURE • 1 atm. (15 PSI)MAX. WATER PRESSURE • 5 atm. (75 PSI)MIN. AMBIENT TEMPERATURE • 5 °C (41oF)MAX. AMBIENT TEMPERATURE • 40 °C (104oF)MAX. VOLTAGE VARIATION • ± 10%December 2000 Page 5

MAR1400 & MAR2000General informationEach MAR1400 or MAR2000 is an “Evaporating Some specific applications include:Unit Section”, complete with driving mechanismand control devices, encased in a stainless steel a) Fishing Vesselscabinet. They only require a condensing unit tomake a complete scale-ice maker system. b) Fish Markets and Fish Processing PlantsBecause they must be remotely connected to a c) Supermarketsproperly sized Condensing Unit, it is very importantthat the right type and size of all the components d) Meat packaging plantsbe used to complete the refrigerant system. It isalso very important that highly skilled refrigeration Basically they can go in any place where there is atechnicians be used to complete the system by limited space situation or where the condensingmaking the refrigerant, water supply, drain andelectrical connections. unit (compressor/condenser) must be located in a room where noise and heat is not objectionable. MAR Split can be set to produce “THICK ICE”APPLICATIONS generally used in the fishing industry or theThe MAR units produce scale ice. Scale ice is a MAR1400 can be set to produce “THIN ICE”dryer and colder form of the familiar flake ice. The generally used in the meat processing industry.MAR split unit is a remote low side system. A Standard versions are set for “THICK ICE”remote low side allows more flexibility in production (about 2 mm or 5/64” thickness) and forplacement of the ice machine section. fresh water operation. December 2000 Page 6

MAR1400 & MAR2000Complete System InstallationHow it is made Dedicated Condensing Units: SuggestedThe complete scale-ice making system can be Modelsdivided in three major groups, they are: MAR1400: Use MAR1400-RHS-A/C (air cooled) ora) the condensing unit or rack system MAR1400-RHS-W/C (water cooled)b) the evaporator drum unit (MAR1400 or MAR2000: Use MAR2000-RHS-A/C (air cooled) orMAR2000) complete with drive mechanism, drive MAR2000-RHS-W/C (water cooled)motor, refrigerant and water lines fittings, Condensing Unit Component Guidelinesrefrigerants expansion valve and electric wire The condenser is basically a heat exchangerjunction box. where the heat absorbed by the refrigerant duringc) control panel and box with compressor ON/OFF the evaporating process is discharged to theswitch, relay, timer, warning lights, pressure condensing medium, which could be air or water.switches and electrical wire terminal block, Water cooled condensers require the use of aconnected to and controlling the condensing unit. water regulating valve. When using a marine type condenser a marine type water regulating valve isCONDENSING UNIT COMPONENTS - For required. The required capacity of the condenser isReference Only about 30,000 BTUH for the MAR1400 and 39,000 for the MAR2000.The condensing unit is not part of the MAR1400 or Particular care must be deserved to the selectionMAR2000. They must either be connected to an of the water cooled condenser especially theexisting rack system or a separate condensing marine type for fishing vessels installation. Theyunit. must be marine type (cupro-nickel).The selection of proper type and size of The Liquid receiver is a storage tank for liquidcompressor together with the proper type and size refrigerant. It is a common component used inof condenser, their components and controls, is refrigeration and should be large enough to hold allcritical for proper system operation. the refrigerant in the system.The available capacity of the system must equal at A suggested component for some installations anleast oil separator. When the compressor operates small amount of oil is pumped out along with the • 4800 Kcal/h at -24EC Evap. Temp. (19,000 hot compressed vapor and to prevent it from going BTUH at -11oF) refrigerating capacity for the any further in the system, the oil separator traps it MAR1400 to return, upon opening of its float valve, to the crankcase of the compressor. • 6500 Kcal/h at –24oC Evap. Temp (26,000 BTUH at –11oF.) refrigerating capacity for the MAR2000Length of Tubing Run Suction Line Liquid Line4 to 15 meters (11 to 50 feet) 18 mm ID (3/4” OD) 12 mm ID (1/2” OD)Less than 3 meters (10 feet) 14 mm ID (5/8” OD) 14 mm ID (3/8” OD) December 2000 Page 7

MAR1400 & MAR2000Condensing Unit Component Control DevicesThe scale-ice maker refrigeration system musthave certain safety devices and controls in order tofully protect it, however an excess of automaticcontrols and protections may complicate thesituation.In order to help the installer to decide with whichcontrols to use, a description of typical controlsand their positive and negative points is listedbelow.High Pressure ControlStrongly recommended for a condensing unit. Setto values shown on tech. spec.Lo Pressure ControlRecommended for a condensing unit. Veryimportant because in case of refrigerant leaks atthe evaporator, it prevents the operation of themachine when the evaporator is in a vacuum.Operating the evaporator in a vacuum could drawinto the system water from the drum reservoir.Vacuum could also cause air inflow through thecompressor crank-shaft seal.However, it may trip-out at system start-up and ifthe suction operating pressure is very close to thecut out point, it may trip out then as well. December 2000 Page 8

MAR1400 & MAR2000Location ConsiderationWARNING - MAR SCALE ICE MAKERS are not Insulate any lines that will be exposed todesigned for outdoor installations where air temperatures that will be below freezing fortemperature falls below 5EC (40EF) or may extended periods of time.exceed 40EC (100EF) Follow straight line routing, when possible,Operating a machine with an unacceptable however pitch the suction line 2 cm per meter orconfiguration will void the refrigeration system ¾” per yard.warranty. Do not restrict the liquid line. Bends and fittingsFor installation on board of fishing vessels, the should be the minimum necessary as they canlocation for the condensing unit is generally the increase the resistance to the fluid flow.engine room, while the evaporator unit can bepermanently placed in some area of the If using a semi-hermetic compressor, the use ofdeck-house or, if it is not too cold (not below 5EC vibration absorbers near the condensing unit willor 40oF.), inside the fish and ice hold. help to reduce condensing unit vibration traveling into the lines.If the MAR unit will be mounted to a fabricatedstand, it must be adequately fastened to it. Because the appearance of an installation is important, the piping should be put-in as neatly asThe stand must also be sturdy so it does not cause possible.excessive vibration and must be able to besecurely fastened to the wall or to the floor. For best sound absorption, it is best to put-in two absorbers in each line, one vertically and onePlacement of the MAR unit must take into horizontally.consideration where the ice is discharged andwhat type of container (ice storage bin or walk-in) For evacuation and charging operations twowill be used. service valves must be provided. One on the liquid line and one on the suction line.REFRIGERANT LINES A drier and a sight glass should be installed in theThe diameter of refrigerant lines going from liquid line at the condensing unit.condensing unit to evaporator unit and back mustbe of adequate size in relation to tubing length.The table below show the recommended sizes ofrefrigerant lines:Note: The tubing connections at the MAR unit are3/8” liquid and 5/8” suction.Length of Tubing Run Suction Line Liquid Line4 to 15 meters (11 to 50 feet) 18 mm ID (3/4” OD) 12 mm ID (1/2” OD)Less than 3 meters (10 feet) 14 mm ID (5/8” OD) 14 mm ID (3/8” OD) December 2000 Page 9

MAR1400 & MAR2000Installation Diagrams December 2000 Page 10

MAR1400 & MAR2000Water CircuitThe ice machine must have an adequate water Also a weight volume ratio of 2,1 cubic meters persupply. Connect a water supply to the ice making 1000 Kg of ice (30 lb per cubic foot) must be takensection and to the condensing unit case a water into consideration for correct ice storage.cooled condenser is being used. Separate water a) Non-refrigerated room for short term storagelines are recommended with hand shut-off valve Ice can be produced continuously for 24 Hours perand water filter on individual line. day, however the use period is generally for noRemember: longer than 8 hours per day. Therefore storage– Maximum Water Temperature 35EC (95oF.) facilities should be provided for a minimum of 16– Minimum Water Temperature 5EC (40oF.) hours of production, or the amount required during– Minimum Water Pressure 1 atm (15 PSI) a peak use period. This means that every MAR ice– Maximum Water Pressure 5 atm (75 PSI) machine must be installed with a properly insulated storage room which should have a minimum capacity of 2/3 the daily ice production.MAR1400 requires 29 lt/hr (7.7 gallons/hour) of With a well insulated room and duly subcooledconstant water supply for ice making. scale ice, the limited losses of heat through the walls of a properly designed room with adequate arrangements are largely offset, and excessMAR2000 requires 42 lt/hr (11 gallons/hour) of melting will not occur. In most situations whereconstant water supply for ice making. whole quantity of ice produced is being used on aFor installation on fishing vessels, using seawater, daily basis, it is not necessary to provide coolingto carry sea water from sea chest to the for the ice storage room.condensing unit and to evaporating unit through b) Refrigerated room for extended storage andappropriate strainers, you may use aluminumbrass pipes or PHE plastic pipes to avoid corrosion long distance conveyingproblems. When scale ice is to be transported at a considerable distance, such as aboard fishingNever use copper tubes with sea water. vessels, or in locations with normal ambient temperatures conditions, or when used in industrial plants where demand is intermittent, its subcoolingICE STORAGE BINS power must be preserved in the storage bin by aThe ice storage bin for a MAR unit must be proper cooling system keeping air temperature at adesigned for use with the MAR. The ice chute pre-established and constant value. The ideal iceposition and the physical size of the cabinet must storage room is the type with mechanicallybe accounted for. In some cases the MAR must be refrigerated jacket space surrounding the ice bin.positioned with its side panel to the front of the bin. Good practice calls for an ice storage capacity of about two times the daily ice machines productionSee sales literature for more information. with an inside temperature of -6EC minimumICE STORAGE ROOM (20EF).Ice storage situations are of two kinds:a) Short term storageb) Extended term storageThe scale ice made by MAR machines is flat, dryand subcooled, so there is some tendency for theice to stick together. To improve ice handling,particular attention is required for proper icestorage conditions. An insulated ice storage bin orroom is always required, then according to ice enduse application, this can be refrigerated ornon-refrigerated. December 2000 Page 11

MAR1400 & MAR2000InstallationMAR SPLIT UNIT - UNPACKING AND LOCATION AND LEVELINGINSPECTION 1. Position the MAR SPLIT UNIT in the selected1. Visually inspect the exterior of the shipping permanent location which could be on top of icecontainer and skid. Any severe damage noted storage bins, on the side of cold storage roomshould be reported to the delivery carrier and a supported by special pre-set stands or, in case ofconcealed damage claim filled subject to internal fishing vessel installation, inside or on top of theinspection with the carrier representative present. fish hold.2. Remove the packing and remove the side Note: See sales information for suggested binpanels, then remove the shipping bolts securing applications. Most will require the MAR unit tothe unit to the skid. be placed sideways on the bin’s top.3. Remove screws and all panels from cabinet and See illustration at the bottom of this page.inspect for any concealed damage. Notify carrier ofany concealed damage claims as stated in step 1 2. After having placed the unit on the supportabove. stand or bin, place thin rubber pads between the ice machine base and the stand to level the4. Remove all internal packing from unit cabinet on both the left to right and front to rearcompartment. directions. There are holes in the base of the cabinet, use them to secure the unit to the stand5. Check that refrigerant lines do not rub or touch with the appropriate (stainless steel) bolts.lines or surfaces and that all wires are securelyfastened to their terminals. Make sure to leave enough space around the unit to allow access to internal components for6. Use clean damp cloth or disposable paper towel inspection and servicing and also for the fitting ofto wipe the exterior surface of the cabinet clean. the ice chute.7. See DATA PLATE on the cabinet base and 3. If installing a separate condensing unit, positioncheck that the location source voltage corresponds the condensing unit in its location and to mount itwith the voltage specified on the data plate. firmly to avoid a sudden shift that would endangerCAUTION - Improper voltage supplied to the the refrigerant lines. Precautions to be observedice maker will void the warranty. vary with the kind of situation in which the unit is to be placed. The area should be well ventilated to permit escape of refrigerants in case unit develops a leak. Water andRefrigeration Connection Area MAR Unit Chute ElectricalConnection Area Top View of MAR on 60”w x 40”d bin December 2000 Page 12

Bin Thermostat MAR1400 & MAR20001. Remove bin thermostat bulb from its shipping ICE CHUTEposition (on side of control box). The ice chute is packed separately, and must be2. Remove the top panel of the ice machine. connected to the ice machine after it has been3. Route the thermostat across the top of the ice positioned on the ice storage bin.machine to the chute (packed separately). 1. Position the chute in front of the ice machine.4. Route thermostat bulb between plastic chute 2. Install thermostat (see above).and opening in front panel for the chute. 3. Insert chute into hole in bin top.5. Insert cable tie mounts into holes in bottom of 4. Align chute cut out with plastic spout of icechute. machine. 5. Place cover on chute - lip on cover will insert behind front edge of top panel. 6. Return all panels to their original positions. Thermostat Capillary Tube Top View of Unit, Reservoir Cover Removed Plastic6. Insert bulb of thermostat through loops in cable Spouttie mounts, pull loops to secure bulb. Ice Chute Thermostat Mounting Cable Ties View of inside of chute from the top.7. Position excess capillary tube so that it is abovethe control box, not in chute or machinecompartment. December 2000 Page 13

MAR1400 & MAR2000Component Assembly1. Install the ice chute. After all lines are connected, the entire system2. Route the bin thermostat from its shipping must be leak tested.position on the control box to the ice chute. The complete system should be pressurized to no3. Install the bin thermostat bulb in the ice chute. more than 11 atm (170 PSIG) with a trace of R-22 refrigerant and dry nitrogen for leak testing with an electronic type leak detector.MAR SPLIT UNIT - REFRIGERANT PIPING For pressurizing, evacuating and charging theCONNECTION system, two service valves are necessary; oneFitting sizes: should be in the Suction Line at the inlet side of suction filter and one should be in the Liquid Line Liquid Line Suction Line at the outlet side of filter dryer. 3/8\" 5/8\" The two Service Valves, if properly capped, can beNote: Connect the proper size tubing according to left permanently in the system. Connection shouldthe length of run. Runs longer than 10 feet will be 3/8\" or 1/2\" size.require larger diameter tubing than these WATER PIPING CONNECTIONS (PLUMBING)connection sizes. The MAR is supplied with float valve that maintainsThe MAR unit is shipped with a small holding the water level in drum reservoir at the heightcharge of R-404A. Recover this charge before required for fresh water operation or if required, forconnecting the refrigeration tubing. sea water operation. The water inlet line connectsTake extreme care to keep refrigeration tubing directly to the float valve line fitting which is 3/4\"clean and dry prior to installation. hose coupling thread, (copper tubing is notFollowing procedure should be followed: recommended for sea water supply).a) Do not leave dehydrated compressor or Note: An adapter fitting to go from 3/4” hosefilter-drier open to the atmosphere any longer than coupling thread to 3/8” male flare is packedit is absolutely necessary. (One or two minutes inside the MAR unit.maximum suggested). Make sure to use a hand shut-off valve close enough to MAR unit and a proper kind and size of filter strainer.b) Use only refrigeration grade copper-tubing, Incoming water goes through the float reservoirproperly sealed against contamination. first and then to drum basin.c) Permanent suction line filter and liquid line The drain water line should be shaped adequatelyfilter-driers are recommended in all field installed to drain by gravity any water passing through it.systems. Water drain fitting from float reservoir requires a 20d) When brazing refrigerant lines, an inert gas m/m I.D. (3/4” ID) water hose.must be passed through the line at low pressure to All plumbing connections should be made inprevent scaling and oxidation inside the tubing. accordance with local plumbing codes.Dry nitrogen is preferred.e) Line connections to vibration eliminators mustbe made with silver solder alloy. Arrange thatrefrigerant lines run along the walls and ceilingsand be supported at intervals frequent enough tokeep tubing straight and firmly in place. In allcases the tubing should be run horizontally andvertically with neat looking bends of as perfectradius as possible.The liquid line is not critical regarding its slope andposition, but the suction line must be installed sothe tubing will drain toward the compressor. December 2000 Page 14

MAR1400 & MAR2000Electrical ConnectionThe supply power, voltage frequency and phase Connect power to terminals 3 and 4 on themust coincide with unit nameplate. MAR Split units terminal strip.are internally wired and ready for field wiringconnections which must be made in accordancewith any local codes that may apply. Wires shouldbe of adequate size to handle the connected load,individually fused (see specifications) and providedwith ground line. Dedicated Condensing Unit:The maximum allowable voltage variation must not Follow all applicable codes.exceed ten percent of the nameplate rating, evenunder starting conditions. Low voltages can causeerratic operation and may be responsible forserious damages to the overload switch and motorwindings. December 2000 Page 15

MAR1400 & MAR2000Multiple InstallationsIn a multiple installation various types of Installation of MAR SPLIT in multiple systemcommercial refrigerating equipment are connected should be done in the following order.to the same condensing unit. 1. Put MAR SPLIT unit in place.The MAR can be one of the refrigeration units See Location & Leveling.connected to a multiple-use condensing unit or 2. Install valves and controls.rack. Hand shut-off valves on both liquid and 3. Install tubing.suction line is recommended for these See Refrigerant piping connections.installations. One to be placed on the liquid lineand the other on suction line to isolate MAR SPLITunit when necessary.Suction and Liquid line access valves must be 4. Make water piping connections.installed in the MAR circuit to evacuate its system. See Plumbing.In many multiple installations check valves are put 5. Make electrical connectionsin the suction line of the coldest evaporator to See Electrical connections.prevent warmer higher pressure low-side vapor 6. Check for leaks.from moving into the colder evaporator during the See Leak Test.off periods. 7. Dehydrate (evacuate) installation.The MAR liquid line connection must NOT be See Evacuation / Charging.connected downstream of any other unit’s liquidline solenoid valve to insure that the MAR receivesrefrigerant when it is required. 8. Start unit. See Operational Check-out. December 2000 Page 16

MAR1400 & MAR2000TestingCOMPLETE SYSTEM LEAK TESTS CHARGING: DEDICATED SYSTEMDuring pressure testing for leaks, keep the When a dedicated condensing unit (a condensingcompressor suction service valve and discharge unit that is only used by the MAR flaker) is used,service valve closed to prevent air and moisture charge the system through the fitting in the liquidfrom entering the compressor. All other valves in line. Weigh the refrigerant drum before charging sothe system must be open. Add just enough liquid that an accurate record can be kept of the weightrefrigerant R-22 to the system to raise the of refrigerant put in the system. If refrigerant ispressure slightly, then add dry nitrogen to obtain added to the system through the suction side onthe desired test pressure (11 atm or 170 PSIG is the compressor, charge in vapor form only. Chargesufficient). the system until the sight glass in the liquid lineLeak testing shall be performed with an electronic shows a clear flow of liquid refrigerant.leak detector. Refrigeration piping will not be Bubbles or foam usually indicate insufficientacceptable unless it is gas tight. refrigerant, even if there could be other reason forIf any leaks are found, isolate the defective area, the bubbles or foam to appear in the sight glass.discharge the gas and repair the leaks and then So, the practice to relay on the sight glass only torepeat the test. When testing has been completed determine whether the systems is correctlyrelease all pressure freely to atmosphere. charged is certainly good but not fully positive.COMPLETE SYSTEM EVACUATION After the final leak test, refrigerant lines exposedUse a vacuum pump that has a capacity of pulling high ambient conditions should be insulated toa vacuum of 50 microns or less. reduce heat pick-up and prevent the formation of flash gas in the liquid lines.Evacuation of the system must never be done by Suction line should be insulated if exposed, tothe use of the refrigerant compressor. The vacuum prevent condensation.pump should be connected to both the low and CHARGING: RACK SYSTEMhigh side evacuation valves with vacuum hoses.The hand valves should remain closed to isolate Open the liquid and suction line valves.the new part of the system from the rack. A highvacuum gauge capable of registering pressure inmicrons should be attached to the system.Evacuate the system to 300 microns. December 2000 Page 17

MAR1400 & MAR2000Start-UpCondensing Unit: individual control and protective device for properFollow the manufacturer’s start up check list. setting.MAR1400 or MAR2000: 10. Eliminate any excessive vibration or noise and pulleys misalignment.After system has been charged and checked-out 11. Observe that evaporator drum is frosted allmake sure to correctly position the ice chute. over from end to end. If this is not the case settingPerform a through re-check of entire system as per of refrigerant expansion valve may be necessary.following steps. For proper adjustment of this valve turn the valve1. Make sure to open the water supply line shut-off adjustment stem of one eight of a turnvalve and that water flows freely from float valve counter-clockwise to allow more refrigerant to flowinto the drum basin. until the evaporator drum surface is evenly frosted2. Connect power to the system in order to start-up from end to end.the evaporator drive motor, the water pump and In case there is an excessive frost back on thethe compressor. suction line and frost start to form on compressorNote: For the first 8 - 10 minutes after power is suction service valve, slightly turn clockwise theconnected to the MAR unit, only the water pump expansion valve setting stem until the frost backand the time delay relay are powered. There will on the compressor service valve melts over.be a red light in the upper left corner of the time Indicative Operating Pressure - With Freshdelay relay. After the time delay relay’s off time Water Supply - Water Cooled Systemhas expired, there will be red lights in both theupper left and the upper right corners of the frontof the relay. At that time the liquid line valve and • Head Pressure (bar) 17 (245 PSIG)contactor will power up, and the unit will soonbegin to make ice. • Suction at EPR valve: 1.6 (22 - 23 PSIG) • MAR1400 Drum R.P.M. (thick ice) 1.53. Observe that evaporator drum rotates in the • MAR2000 Drum R.P.M. 2.4right direction, namely towards the scraping blade. 12. In relation to the desired quality of scale ice, review the position of float reservoir to see if waterWARNING - Care must be taken to ensure of in drum reservoir is at the corresponding level.the correct rotation direction of drum. The correct water level is:4. Check compressor head and suction pressures. • 115-120 mmIf not within system design limits, determine why • 4.5” to 4.75”and take corrective action.5. For a water cooled condensing unit check the 13. Observe that ice slides through spout openingwater flowing out of the condenser to see if it with no difficulties. Clearance between the bladedrains properly. and drum surface must be 0,10 m/m (.004”). Transparent plastic chute must be flat.6. Observe if ice skin tends to cover entire drum 14. When the system is performing satisfactorilysurface and is being scraped-off correctly by the go over with the owner/user to all significantblade. specifications, the start-up and operations. Answer7. Check liquid line sight glass and expansion all questions about the care and attention to givevalve operation. If there are indications that more to the ice making system.refrigerant is required leak test all connectionsbefore adding refrigerant.8. Observe oil level in compressor crankcase sightglass and add oil as necessary to bring level tocenter of the sight glass.9. Let the system operate for at least two hours,then check one by one the operation of each December 2000 Page 18

MAR1400 & MAR2000Electrical Sequence:After power has been connected, because the bin made for the refrigerant flow becomes thethermostat bulb is warm, the water pump will start. evaporator’s serpentine.After water has been supplied to the machine, the Metered refrigerant enters through the manifoldTime Delay Relay is energized and, after its preset and enters the evaporator serpentine. There itwait time has expired (about 8 - 10 minutes), it boils and evaporates as it comes into contact withconnects power to the contactor coil and the liquid the drum’s metal jacket, reducing the temperatureline valve. of the drum. About one third of the cylinder drum is constantly submerged in water. This allows theThe gear motor begins to turn the drum. cylinder metal jacket to draw a film of water that,When the bin thermostat opens the pump, as soon as it comes out of the water, freezescontactor coil, time delay relay coil, gear motor and almost instantly due to the heat absorption createdliquid line coil all open or stop. by the boiling refrigerant circulating in the serpentine.The unit will not restart until the time set in the time On fresh water systems a water pump and waterdelay relay has expired. distributor tube provide a constant flow of coldThis light is This light is water to the upper side of the evaporator drum.on when there on when the The extra water increases the effective freezingis power and other light is surface and results in a thicker ice layer.the bin on AND the The ice layer on the emerging cylinder thenthermostat is time delay quickly solidifies, dries and eventually subcoolsclosed.* has expired. before contacting the edge of the horizontal scraping blade. The heavy duty metal scraping blade causes the ice sheet to peel off of the drum jacket by scraping it as it advances on the revolving drum. The ice sheet is so dry that, when it gets in contact with the scraping blade, it cracks in a form of irregular shaped chips. The refrigerant leaves the evaporator serpentine to return to the compressor via suction lineTime Delay Relay, Set at Normal Delay Position through the inner bore of the manifold.* And all safety switches are closed. The refrigerant is sealed in the inlet/outlet headPRINCIPLES OF OPERATION - HOW IT WORKS manifold by a specially designed sealing device.1. ICE MAKER The cylinder is driven by separate drive motor andThe revolving drum is made of a cylinder shaped gear reducer located on the opposite side of theskeleton covered by a stainless steel jacket. refrigerant manifold.Just under the stainless steel jacket is a channel, The gear reducer, the driving belt with its pulley,about 15 m/m (9/16”) deep and 15 m/m wide. The the revolving drum with the rotating part of thechannel is in a spiral pattern that goes from one sealing devices and the water pump on fresh waterend of the cylinder to the other. installation are the mechanical parts in motion.Both ends of the channel are connected with abore made in the right cylinder journal. Themanifold on the right side is for both liquidrefrigerant inlet and vapor refrigerant outlet.Since the cylinder’s stainless steel jacket is tightlysealed onto the drum, the spiral pattern channel December 2000 Page 19

MAR1400 & MAR2000Water and Refrigeration Schematics1. Water drawing area2. Water sprayed onto freezing cooling area3. Sub-cooling area4. Float valve5. Water line6. Scraping blade7. Water pump8. Water basin9. Revolving drum10. Water distributing tube December 2000 Page 20

MAR1400 & MAR2000Water and Refrigeration Schematics1. Liquid Line 8. Evaporator drum2. Heat exchanger 9. Scraping blade3. Automatic expansion valve 10. Water pump4. Suction line 11. Spray bar5. Water inlet 12. Water tube - Pump / Spray bar6. Float valve 13. Liquid line valve7. Water basin December 2000 Page 21

MAR1400 & MAR2000MAR Split - Electrical / RefrigerationThe electrical circuit consists of drive motor, water Turning the adjustment to the left,pump, water pressure switch, spout switch and counterclockwise, will increase the rate thetime delay safety device. pressure in the evaporator.A. Drive motor When the compressor is not running the valve willThe evaporator drum drive motor is a single phase remain closed as the low side pressure will be highmotor of 1/2 HP wired for 220 Volts 60 Hz – 2.1 enough to close the expansion valve.Amps - 1400 R.P.M. with inherent thermal - MAR1400 or MAR2000 are each equipped withprotector. In normal operation this motor draws an expansion valve having an orifice of 2,5 m/m.between .8 and .9 amps. F. Evaporator DrumIMPORTANT Make sure that drive motor Refrigerant inlet/outlet takes place on left siderotates clockwise facing the unit’s front. journal.Failure to this, may result in wrong rotation of The drum body is covered by a jacket in specialevaporator drum with the risk of major damages to stainless steel resistant to the water corrosion.the system.B. Water failure Switch The front edge of the scraping blade must haveThis switch used as safety device when low or a minimum clearance of 0.10 m/m(.004 inch)interrupted supply water conditions are from cylinder metal jacket.encountered. G. Refrigerant Seal SystemOperates on pressure between supply line and Housed in the refrigerant inlet/outlet manifoldfeed line to water reservoir. located on the evaporator drum left side journal, isRange is 0,8 atm (10 psi) off and 1,2 (17 psi). a leakproof joint. This joint is made with seals thatCuts off complete unit and Resets automatically. are carefully designed and installed. The seals useC. Ice Spout Safety Switch two rubbing surfaces. One surface turns with theLocated on top of the Ice Spout, the Safety Switch cylinder journal and is sealed to it with on O ring ofis operated by a plate on top of the ice chute by synthetic material. The other surface is stationarythe ice backing up in the spout. and fitted in its housing with leak-proof O rings.The switch will shut-off the liquid line valve and The rubbing surfaces (optically flats) are made ofgear drive motor. It will automatically reset when two different materials: hardened steel for thethe ice melts. rotating ring and graphite for the stationary ring. The rotating parts are: a) the spring collarD. Timer - Time Delay - With settings from 0 to 30 b) the compression springmin. It delays the energizing of main contactor inrelation to its time setting, preventing short cycling c) the stainless steel seal ring with O ring.of unit’s motor compressor and drive motor. The stationary parts are:E. Automatic Expansion Valve (A.E.V.) a) the graphitic ring with O ringThe automatic expansion valve meters therefrigerant from the liquid line to the evaporator. As b) the stainless steel housing ring with gasket andthe pressure decreases on the low side, the O rings.expansion valve opens and refrigerant escapes H. Heat Exchangerinto the evaporator drum channel where it absorbsheat from water while evaporating. The valvemaintains a constant pressure in the evaporator There is a heat exchanger mounted in the suctioncoil when the system is running independently of and liquid line to reduce flash gas in the liquid line,the amount of refrigerant in the system. to reduce liquid refrigerant in the suction line, and to subcool the liquid refrigerant thereby increasing the operating efficiency.This valve has a manual adjustment to give theevaporator coil the desired pressure of refrigerant. December 2000 Page 22

MAR1400 & MAR2000MAR Split - Electrical / RefrigerationI. Strainer Filter O. Water pump / spay barThere is a strainer in the liquid line to prevent the Used only on FRESH WATER version the waterexpansion valve from becoming clogged with pump is mounted on the rear left side ofdebris. evaporator drum basin.L. Motor Shaft Pulley It supplies water under gentle pressure to the spray bar located on top of evaporator drum.MAR Split units are generally equipped with “Steppulley” and by changing the belt from one groove Amp draw of the pump during normal operation isto the other the speed of drum can be changed. .3 amps.The motor pulley must be reversed and the beltre-tightened to change speeds. MAR2000 has an additional spray bar at the front of the evaporator drum.MAR1400 machines are factory delivered with Vbelt on smaller dia V groove of step pulley to rotate P. Ice Level Control – Bin Thermostatthe evaporator drum at the lowest possible R.P.M.to obtain “THICK” (2 m/m or 5/64” thick) scale ice. Note: It is subject to corrosion in marine applications. Mounted in the control box. Must beNormal drum R.P.M.s for “THICK” ice production deployed at the time of installation.are: R. Master Relay or ContactorMAR1400 - 1.5 RPM With electric coil connected in series with safetyMAR2000 – 2.4 RPM controls for operation in safe conditions of condensing and evaporating unit. Mounted in theM. V Belt control box.V belts used on motor shaft pulley and gear box T. Time Delay Relayare type Z 33 The relay must be energized for about 10 minutesWhen changing the V belt from one groove to before it will actuate its contacts and power theanother, be careful to adjust it for proper tension liquid line valve (which will start the compressor onand alignment. It should be snug not tight. A way dedicated condensing units) and the evaporatorto roughly check belt tension is to apply a firm drive motor.hand pressure in the middle of the longest belt This type of relay prevents compressor andspan. If the belt is correctly tensioned, you should evaporator drive motor short cycling which couldbe able to depress it about 5 m/m (3/16”) out of be harmful to evaporator drive mechanism due toline. ice skin being formed on the evaporator drumN. Gear Reducer jacket that get thicker and sticker duringThe gear reducer is mounted to the side frame of evaporator drive motor off-momentum. Mounted inthe evaporator drum basin. The gear reducer bore the control box.in which passes the drum shaft to be driven, has a V. Liquid Line - Solenoid Valvekey way. Stops refrigerant flow when not desired. LocatedTwo fiber keys are used to engage the gear on the liquid line, it is electrically connected to thereducer to the drum shaft, they are in line in the contactor or relay to stop flooding the evaporatorgear reducer bore and shaft key ways. and suction side during compressor off periods.Should the driving strain be excessive, the twofiber keys will shear.Both the MAR1400 and the MAR2000 areequipped with a gear reducer having a ratio of1/570.The gear reducers are greased for life, thereforethey do not require any maintenance. December 2000 Page 23

MAR1400 & MAR2000AdjustmentsThe procedures provided in this section arearranged in order to make specific adjustment andremoval and replacement information easy tolocate.Read the instructions thoroughly before performingany adjustment or removal or replacementprocedures.1. ADJUSTMENT OF THE AUTOMATICEXPANSION VALVEEnd to end frost on the evaporator drum is theresult of the correct expansion valve setting.This valve may be manually regulated by means ofthe adjusting stem.Turning the adjustment to the left(counter-clockwise) will increase the rate ofrefrigerant flow.Turning the adjustment to the right (clockwise) therefrigerant flow to the evaporator is reduced.Use the stem cap of the AXV for manual adjustingoperations.Set the EPR first to -24°C (-11.2oF) or 22 - 23PSIG, then adjust the AXV to frost the refrigerantdrum completely.If adjusting the EPR does not lower the suctionpressure to the desired level, and the suctionpressure at the condensing unit is lower than thesuction pressure at the EPR, the AXV isoverfeeding and should be adjusted to reducerefrigerant flow.When connected to a dedicated condensing unit,frost back to the compressor may occur. If thecompressor is heavily frosted, adjust the AXV toreduce refrigerant flow. December 2000 Page 24

MAR1400 & MAR2000Adjustment & Removal & Replacement ProceduresWARNING - Be sure the electrical power supply 4. Loosen and remove one of the three screwsand water supply are OFF, before starting any securing the seal mechanism ring to the drumof the following REMOVAL AND shaft journal.REPLACEMENT procedures as a precaution toprevent possible personal injury or damage toequipment.2. REMOVE AND REPLACEMENT OFEVAPORATOR DRUM REFRIGERANT SEALINGDEVICES – must use seal kit.1. Switch the MAR unit off and isolate it from thecondensing unit by shutting its liquid and suctionline valves. Recover any refrigerant from the MARunit.After that the flare fitting at the inlet of refrigerantmanifold can be disconnected as shown. 5. Fit in place of it (screw removed in prior step) the screw of 4 MA supplied in the kit then tighten its nut.2. Remove the 4 allen screws connecting the 6. Gradually loosen the two remaining screws andrefrigerant outlet fitting to the manifold. the nut to release the spring of the seal3. Loosen and remove the 6 nuts that secure the mechanism.refrigerant manifold (1). December 2000 Page 25

MAR1400 & MAR20007. Loosen the last screw to remove the sealmechanism ring as well as the seal mechanismS.S. ring and its spring.8. Remove the stainless steel ring that houses thegraphitic seal ring. 11. Examine carefully the graphitic surface of the seal ring. If this surface is no longer perfect and optically flat, proceed to replace the seal ring in the following way.9. Check to see the surface conditions of cylindershaft journal. It is of extreme importance that thissurface be clean, smooth and polished. 12. Lubricate the outer surface of the new seal ring with compressor oil and place it at the inferior of the housing ring.In case of scored surface it is necessary to strokeon it a very fine sand paper stripe.Check to see that washer be properly clean andpositioned with keyway to match the key.10. If necessary replace the 0 rings of the S.S. ringthat houses the graphitic ring. December 2000 Page 26

13. Place trust washer with teflon coated surface MAR1400 & MAR2000facing spacer matching pin with hole 16. Mount on drum shaft journal the remaining portion of seal mechanism (S.S. ring and spring) then the seal mechanism ring.14. Place on drum shaft the steel ring housing the 17. Fit the screw of 4 MA with its nut in one of thegraphite ring. three threaded holes then screw down the nut in order to compress the spring.15. Lubricate the O ring inner surface of sealmechanism with refrigerant oil 18. When the seal mechanism spring has been partially compressed fit the other two screws and fully compress the spring by gradually screwing down the three screws. 19. After having tightened the screws loosen the tie rod screw and replace it with the third one. December 2000 Page 27

MAR1400 & MAR2000 21. Clean the inner surface of refrigerant manifold carefully. Check to see the good condition of the20. Place the the S.S. Ring on the shaft end seal ring and fit it in its seat inside the refrigerantfirst…. manifold. Fit on shaft end the washer which keeps in place the seal ring inside the refrigerant manifold and fit inside the manifold the gasket.…...then the spring ring with the inside springfacing the S.S. ring. 22. Position the manifold on the six mounting studs, fit the six mounting nuts and washers and tighten all them down by means of a 10 mm. wrench. 23. Connect the outlet refrigerant line to the corresponding port of the manifold and tighten it with the four head recessed screw. 24. Connect the refrigerant inlet line on its manifold fitting and tighten the fitting flare nut. December 2000 Page 28

MAR1400 & MAR2000Adjustment & Removal & Replacement Procedures3. REMOVAL AND REPLACEMENT OF THE 5. REPLACEMENT OF FIBER KEYSDRIVE MOTOR A. Replacement of the fiber keys is only necessaryA. To remove the drive motor assembly: when the keys are broken and do not engage the1) Remove screws and front, top and right side gear motor output shaft with the evaporator drumpanels. drive shaft.2) Slid-off V belt from motor pulley. B. Replacement of the fiber keys requires removal3) Loosen and remove hex head screw securing of the complete gear box.the pulley to motor shaft. For this operation perform all steps above in4) Disconnect wire leads to motor. section 4.5) Remove two hex head bolts, lock washers andwasher, and nut which attach the sleigh supportplate of motor to the side frame of evaporator drumbasin.6) Lift the sleigh plate with the drive motor out ofthe Chassis.7) Loosen and remove 4 Nuts securing the motorto the sleigh plate.B. To replace the Drive Motor Assembly reversethe removal procedure.4. REMOVAL AND REPLACEMENT OF GEARBOXA. Remove screws and front, top and right sidepanels.1) Slid V Belt from gear box pulley.2) Remove screw securing pulley on gear boxinput shaft.3) Remove four nuts and washers which securethe gear box to the evaporator basin side frame.4) Gently tap on the gearbox with a mallet toloosen it from its mounting position.5) Pry with two screw drivers inserted betweenbasin wall and flanged end of gear box to force thegear box away from basin wall. If you encounterany excessive resistance in this, use a 2-jawpuller.6) When gear box is cleared away from the wallwhere it is mounted, pull it out from cylinder shaft.A. To install the Gear Box Assembly reverse theremoval procedure taking care to center keyway ofgear box bore to keys on cylinder shaft. December 2000 Page 29

MAR1400 & MAR2000Maintenance & Cleaning Instructions1. GENERAL a power driven wire brush or running through it aThe periods and procedure for maintenance and weak acid solution made with 20 percent ofcleaning are given as guides and are not to be hydrochloric acid.construed as absolute or invariable. 11. Check for refrigerant leaks and for proper frostCleaning especially will vary depending upon local line, which should frost out of accumulator at leastwater conditions and the ice volume produced and half way to the compressor and in some areas,each ice maker must be maintained individually in back to service valve.accordance with is own particular location Check for dryness of system through moisturerequirements. indicator if any.2. ICE MAKER / CONDENSING UNIT 12. Check for water leaks. Tighten drain line connections. Pour water down drain to be sure thatTHE FOLLOWING MAINTENANCE MUST BE drain line is open and clear.SCHEDULED AT LEAST TWO TIMES PER YEARON THIS ICE MAKER. CALL YOUR 13. Check the quality of ice. Ice flakes should beAUTHORIZED SCOTSMAN SERVICE AGENCY. dry and have a thickness gauge of about 2 m/m.1. Check and clean/replace water line Strainer or 14. Check compressor oil level through sight glass.Filter (when used). Stop unit operation and after two/three minutes2. Remove top panel and depress the float to see that oil level is 2/3 millimeters above centerensure that a full stream of water enters the line of sight glass.reservoir. 15. Be sure of proper position and condition of3. Check that the ice maker cabinet is level in plexiglass chute on spout opening.side-to-side and front-to-rear directions.4. Check that the water level in the Drum basin ishigh enough to surround the wanted portion ofrevolving drum.5. Clean the water reservoir and exterior of thedrum assembly using a solution of SCOTSMANIce Machine Cleaner. Refer to procedure on thefollowing page, CLEANING ICE MAKER.NOTE. Cleaning requirements vary according localwater conditions and individual user operation.6. When doubtful about refrigeration charge, checkgauge for compressor head pressure according tomodel technical specification.7. Check gauge for Suction Line Pressure whichvaries depending upon models, inlet watertemperature and ambient temperature.8. Check drive motor operation. Normal operatingtemperatures are about 60EC (160EC) which is hotto touch. Check with ammeter for Amps drawn.9. Check V belt for concealed signs of wear andthat has the correct tension. Check pulleyalignment and also that drive motor and gear boxhold down bolts are tight enough.10. Make sure that water lines in water cooledcondenser are free from any excess of waterminerals: otherwise arrange to clean the tubes with December 2000 Page 30

MAR1400 & MAR2000Cleaning Instruction1. Disconnect power front the unit. 16. Carefully rinse bracket and float valve by fresh2. Remove screws and top panel water.3. Remove evaporator cover panel 17. Prepare as per step “6\" using a sanitizer rather4. Lock the float valve adjusting screw to avoid than a cleaner. Possible sanitizing solution may bewater incoming during the operation of machine. made by mixing 3 cl. (1 ounce) of liquid house holdMake sure that during cleaning no ice will be bleach with 8 liters (272 oz.) of warm potablestored in any bin or cooling room in order to water.avoid any kind of contamination by cleaning NEVER MIX THE CLEANING WITH SANITIZINGsolution. SOLUTION.5. Dump the contents from the drum basin by 18. Soak float valve and bracket in the sanitizingwithdrawing drain plug located at the bottom solution for 1 minute then rinse all parts with freshrefrigerant side of the evaporator. Once empty water.place again plug in its seat. 19. Install again first the plastic bracket then float valve.Note: Plug may be covered by sealant. Remove 20. Open the water supply shut-off valve.sealant to release plug. 21. Leave water filling until the level inside the6. Prepare a solution in a bucket by mixing 2 lt. (68 basin reaches approx 8-9 cm (3-4\").ounces) of Scotsman Ice Machine cleaner with 16liter (444 oz.) of water. 22. Lock-in again float valve screw.WARNING: When using any chemical, 23. Connect the machine to the power and let theprotection of hands (gloves). SCOTSMAN Ice unit in operation for about 5 minutes for rinsing theMachine Cleaner contains phosphoric and water system.Hydroxiacetic acid. These compound are CAUTION - DO NOT use ice produced from thecorrosive and may cause burns if swallowed. cleaning solution. Be sure none falls intoDO NOT induce vomiting. Give large amount of storage room.water or milk. Call Physician immediately. In 24. Disconnect unit from power.case external contact flush with water. KEEPOUT OF THE REACH OF CHILDREN.7. Slowly pour 90% of the solution in the 25. Repeat 6 then pour sanitizing solution in theevaporator basin. drum basin; sanitizing should last approx 58. Connect the machine to the power and let the minutes. At the end dump solution again as perunit in operation for about 10 minutes. step “5\". Seal plug with food grade silicon. 26. Unlock the float valve adjusting screw.9. Disconnect again unit from power. 27. Replace again evaporator cover an top panel.10. Repeat “5\". 28. Reconnect unit to the power.11. Close the water supply shut-off valve externallyconnected onto the water inlet line.12. Open a little bit the float valve holding armsand remove it from the holder.13. Remove screws and clip-ring securing floatvalve bracket to the nozzle.14. Withdraw bracket from float valve nozzle.15. Place the float valve and its bracket in thesolution remained in the bucket and remove anykind of scale or mineral deposit. December 2000 Page 31

MAR1400 & MAR2000Service DiagnosisThe Service Diagnosis Section is for use in aiding The following chart lists corrective actions for thethe servicemen in diagnosing a particular problem causes of known symptoms of certain problemsfor pin-pointing the area in which the problems that can occur in the ice making refrigerationlines, thus an ever available reference for proper system.corrective action.SYMPTOM POSSIBLE CAUSE CORRECTIONLo-refrigerant press. Add refrigerant to raise suctionLo-water level. pressure.The compressor runs but the unit Incorrect refrigerant suction pressuredoes not make ice. Raise head press. Control setting. Moisture in system. Overcharge of oil Check moisture indicator and in system. remove charge and drier. Replace & recharge the system. Not enough refrigerant. Check for refrigerant leak. Intermittent water supply or too low Water shut-off valve closed. Check water pressure. and clean water strainer. Drive motor gear reducer Check. Repair or replace. inoperative. V-belt loose or broken Check. Repair or replace. Key may sheared. Check. Repair or replace. Gear reducer with one gear Check. Repair or replace. stripped - off. Pulley loose on motor shaft. Check. Repair or replace. Water not entering reservoir. Check and clean. Water float valve to be cleaned.Excessive Hi-pressure Hi-pressure unit operation Check cooling water at condenser.Condenser tube clogged-up. Water regulating valve to be re-adjusted. December 2000 Page 32

MAR101 & MAR121Service DiagnosisREFRIGERATION SYSTEMSYMPTOM POSSIBLE CAUSE CORRECTIONUnit will not run. Replace fuse and check for causeExcessive noise Blown fuse. of blow fuse.Excessive vibration. Check wiring.Making wet ice Loose electrical connection. Turn switch to ON. Switch in OFF position. Replace switch.Low ice production. Inoperative master switch. Check ice chute arrangement. Spout switch cut-out. Align V-belt. Misaligned V-belt. Tighten. Gear reducer loose on frame. Drive motor end-play or worn Repair or replace. bearings. Remove blade and melt-up ice Ice formation underneath blade - formation. Lower water level to frictioning against rotating drum. correct value. Surrounding air temperature above Correct or move unit to cooled 40EC (100EF) location. Under-or-over-charge of refrigerant. Re-charge with proper amount. Closed AEV. Adjust valve for correct refrigerant flow. Faulty compressor valve plate. Repair or replace. Loss of refrigerant,under Check and recharge with proper or overcharge of refrigerant amount of refrigerant. Plugged condenser water tubes Low water level in the reservoir. Clean condenser. Overcharge of oil in system. Check float valve operation. Water pump out of operation. Check at oil sight glass.Lower to 1/2 Spray bar clogged. sight glass. Replace water pump. Clean spray bar. December 2000 Page 33