MAR 305 - Scotsman Ice Systems
Contents
1. TE uL 1 aM H PO n a TUE Y e Y 4 This unit must be grounded Page 37 UPPER FAN MOTORS LOWER FAN MOTORS MAR 305 RC WIRING DIAGRAM WATER PRESS TOO LOW i SPOUT SWITCH This unit must be grounded KE LEVEL CONTROL CUT OUT G GEAR MOTOR THERMAL PROT CUT OUT G ze 0x COMPR PROTECTOR CUT OUT FIG 7 4 BLUE WHITE GREY YELLOW GREEN BROWN BLACK Page 38 FIG 7 5 MAR 55 z LLI LLI oc 5 Z z wE ASS Silico 7 am zxo mm TWO Z FUNCTIONAL ELECTRIC DIAGRAM LINA 03100 div 404 LSM IHH AHH E 0G OzZ E 09 0EZ IJOOW 404 IVYLNIN S32V 1d3H NOLLJ3NNOJ S300 HILVM JJS 404 LON SHDN ONINHVM SHOLOW Ng 2 YOLOW dWOd H32n03H NU LON HV IY HOSS3HdWOJ 103 H012v1NC2 AV 130 YiL HOLIALOYd TvWH3Hl HOSSSHd402 NOWLISLOdd TVWNSHL TOHLNOD SS3Hd IH TOYLNDI dW3l NIG SYNSS add OZH 07 C d a S JOHLNOD SYuNSSaed 07 SAV 3H IN3HH J MO LIVANDI JOHLINOJ 34MSS3Hd i S A This unit must be grounded Page 39 MAR 75 105 125 FIG 7 6 FUNCTIONAL ELECTRIC DIAGRAM a l ie G GREY GV YELLOW GREEN M BROWN N BLACK HOLIMS LNOdS NOT FOR SEE WATER MODELS TOHLNOJ SSzRid 1H WARNING LIGHTS TOYLNDI dugi NG ZMISSJHd OZH 01 220 50 3 MASTER SWITCH FAN MOTORS PRESSURE CONTROL PUMP MOTOR CONNECTION REPLACES NEUTRAL FOR MODEL 230 60 3 JUST2. Contactor MAR contactors have 3 or 5 contacts normally open and 1 contact normally closed The N C contact is generally used to keep the crankcase heater energized during the OFF periods The contactor coil is generally at 230 V 50 Hz 1 Ph and kept energized by the system controls that are connected in series S Thermostat Ice level control When storage room temperature is higher to that of the ice being made the ice level can be positively controlled by this thermostat the sensing bulb of which must be positioned to the wanted levelthat will abviously correspond to the desired ice level in storage room The temperature range dial must be set on to the propertemperature in order that the control may cut out or may cut in respectively when its sensing bulb gets buried into the ice cone and when is freed from the ice This thermostat can be a valid control if it is used in non refrigerated storage rooms as in these cases it is influenced just by the ice temperature T Ice Spout Safety Switch Located on top of the Ice Spout the Safety Switch is operated by a plate on top of the ice chute by the ice backing up in the spout The switch will shut off the entire ice making mechanism U Timer Time Delay With setting dial from 0 to 30 min It delays the energizing of main contactor in relation to its time setting preventing short cyclings of units motor compressor and drive motor It is factory set on 25 delay
3. 2 Maximum vertical rise of 3 meters between the ice maker and the remote condenser 3 Best available location protected from the extremes of dirt dust rain sun and wind B Unpacking and inspection 1 Visually inspect the exterior of the shipping container and any severe damage noted should be reported to delivering carrier and a concealed damage claim filled subject to internal inspection with carrier representative present 2 Uncrate the remote condenser and pre charged refrigerant lines and inspect for any concealed damage claims as stated in step 1 above 3 Check that the pre charged refrigerant lines are intact not kinked and that there is no sealed puncture or loss or refrigerant C Remote condenser Wall attachment 1 Install and attach the remote condenser to the wall of the building using the methods and practices of building standards that conforms to and meets the local building code requirements in your area Removal junction box cover from remote condenser and connect the electrical power lines coming from the unit to the wires of the fan motors by means of the connecting terminal board placed into the junction box following the wires color fitted on the same Pre charged refrigerant lines The set of pre charged refrigerant lines consists of a self sealing liguid line and a self sealing discharge line One coupling on each line is fitted with a Schrader valve which provides the
4. BASIC ELECTRICALS 400 50 3N D WATER OUTLET WATER COOLED ONLY E WATER INLET WATER COOLED ONLY Stainless Steel Stainless Steel Stainless Steel Stainless Steel _ 259 _ 135 _ M15 _ 200 175 92 o7 4 51 64 7 7 amp 65764 31 64 31 64 Page 6 ELECTRICAL POWER Shipping weight 194 xs a 226 2 at 21 C amb 15 C water temp Page 7 SPECIFICATIONS MAR 205 AIR amp WATER COOLED MODELS ice making capacity AIR COOLED MACHINES THICK SCALE ICE THIN SCALE ICE WATER COOLED MACHINES Kg 24 h 1900 710 7 z 21 Kg 24 h 32 38 1800 o DE 10 A 38 1700 1600 1500 ICE PRODUCED PER 24 HRS AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS 1400 1300 WATER TEMPERATURE WATER TEMPERATURE MAR 305 AIR amp WATER COOLED MODELS Ice making capacity AIR COOLED MACHINES WATER COOLED MACHINES Kg 24 h Kg 24 h oC THICK SCALE ICE THIN SCALE ICE AMBIENT TEMPERATURE 2600 2400 2200 2000 1800 1600 ICE PRODUCED PER 24 HRS 1400 WATER TEMPERATURE AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS 2800 2600 2400 2200 2000 1800 1600 WATER TEMPERATURE DE 10 A 38 NOTE Daily ice capacity is directly related to c
5. Unloose and remove 4 Nuts securing the motor to the sleigh plate Toreplacethe Drive Motor Assembly reverse the removal procedure REMOVAL AND REPLACEMENT OF GEAR BOX Remove screws and front top and right side panels Slid odd V Belt from gear box pulley Remove screw securing pulley on gear box inpul shaft 12 Page 28 Remove four nuts and washers which secure the gear box to the evaporator basin side frame With a mallet hit a bit the gear box to create some looseness With the help to two screw driver inserted between basin wall and flanged end of gear box force the gear box to clear away from basin wall if you encounter an excessive resistance in this It better to use a Puller When gear box is cleared away from the wall where it is mounted pull it out from cylinder shaft To install the Gear Box Assembly reverse the removal procedure taking care to center keyway of gear box bore to keys on cylinder shaft REPLACEMENT OF FIBER KEYS The replacement of fiber keys is necessary only when the keys are broken so that they do not engage the gear motor with the evaporator drum drive shaft In practical terms the gear box does not drive the evaporator drum To reach the fiber keys to be replaced it is necessary to remove the complete gear box For this operation perform all steps at point 11 Page 29 SECTION V MAINTENANCE amp CLEANING INSTRUCTIONS 1 GENERAL The periods and proce
6. servicemen with access for refrigerant evacuation through tubes refrigerant charging and service gauges application when necessary When possible route the maximum lenght of the pre charged refrigerant lines inside the building with the minimum lenght outside to prevent vandalism and to minimize the condenser effect that exposed lines can pro duce in cold weather Insulate lines that be exposed to outside temperatures that will be below freezing for extended periods of time CAUTION Each coupling on the set of pre charged refrigerant lines the refrigerant fittings on the remote condenser and on the icemaker chassis are self sealing and should be tightened 1 4 turn more than snug tight ALWAYS USE TWO WRENCHES WHEN TIGHTENING THESE FITTINGS ONE AS A BACKUP WRENCH TO PREVENT TWISTING OF TUBING AND POSSIBLE KINKING OR LINE RUPTURE Connectthe small dia refrigerant line coupling to the unit fitting labelled LIQUID on the right side of the icemaker chassis Connectthe large dia refrigerant line coupling to the unit fitting labelled GAS on the righ side of the icemaker chassis Connectthe small dia refrigerant line coupling with Schrader valve to the condenser fitting labelled LIQUID Connect the large dia refrigerant line coupling with Schrader valve to the condenser fitting labelled GAS Excess lenght of pre charged refrigerant lines at installations where the icemaker chassis to remote con
7. 2 B V Belt V belt used on motor shaft pulley and gear box When changing the V belt from one groove to another be careful to adjust it for proper tension and alignement It should be snug not tight A way to roughly check belt tension is to apply a firm hand pressure in the middle of the longest belt span If the belt is correctly tensioned you should be able to depress it about 10 m m out of line C Gear Reducer Then gear reducer is mounted on the right side frame of evaporator drum basin to which it is firmaly secured with four nuts The gear reducer bore in which passes the drum shaft to be driven has a keyway Two fiber keys are used to engage the gear reducer to the drum shaft they are in series in the gear reducer bore and shaft keyways Should the driving strain be excessive the two fiber keys will shear MAR 55 75 105 125 are equipped with a gear reducer having a ratio of 1 600 MAR 205 and 305 have a gear reducer with a ratio of 1 552 The gear reducers are greased for life therefore they do not require any mainte nance Page 25 SECTION IV ADJUSTMENT amp REMOVAL amp REPLACEMENT PROCEDURES The procedures provided in this section are arranged in order to make specific adjustment and removal and replacement information easy to locate Read the instructions throughly before performing any adjustment or removal or replacement procedures 1 ADJUSTMENT OF THE WATER REGULATOR ASSY Water Cool
8. 8 3 9 8 9 8 Is greater than the 9 maximum and is NOT acceptable Operating a machine with an unacceptable configurationg will void the refrigeration system warranty In a crate separated by the unit Crate are packed 1 The air cooled condenser mounted on the platform base with the electrical junction box condenser shround fan motors fan protection grid fan motor speed control and the refrigerant lines connection couplings 2 One set of pre charged refrigerant line with connection couplings on both ends of following variety Liquid I D 12 m m Gas D 22 m m 6 mts length The pre charged refrigerant lines 6 meters long are equipped with self sealing coupling connections and can be connected or disconnect few times without loosing the refrigerant charge The electric cord line approx 6 meters long located on the left side of the unit has to be connected to the condenser junction box terminals The condenser fan motors are originally wired for 230 V single phase and have the following specifications RPM 1300 1559 WATTS 4x70 AMPS 4x0 7 They operate at 230 V 50 Hz and are controlled by two pressure controls which are connected to the system high side The fan controls are set to cut out and cut in the fan motor so as to maintain the Hi pressure between 15 and 17 bar A Location consideration 1 Limitto 6 meters the lenght of the precharged refrigerant lines from the ice maker to the remote condenser
9. Do not replace the Drier until all other repairs or replacements have been completed A To remove the Compressor Assembly 1 Removecoverfrom the Compressor Junction Box 2 Disconnect the electrical leads at the Compressor Junction Boxthatoriginate in the Control Box 3 Recover the refrigerant from the system and transfer itin a bottle so to reclaim or recycle it 4 Disconnect the suction line from the compressor 5 Disconnect the discharge line from the compressor 6 Remove four bolts lockwashers and washers which secure the compressor to the Chassis mounting base Slide the compressor and remove it through the rear side opening of the Cabinet B Toreplacethe Compressor Assembly reverse the removal procedures 6 REMOVAL AND REPLACEMENT OF THE WATER COOLED CONDENSER NOTE Always install a replacement Drier anytime the Sealed Refrigeration System is opened Do not replace the Drier until all other repairs or replacements have been completed A To remove Condenser 1 Recover the refrigerant from the system and transfer itin a bottle so to reclaim or recycle it 2 Unsolder the refrigerant inlet and outlet lines from the condenser 3 Disconnect the water inlet and outlet lines from the condenser 4 Remove bolts lockwashers and washers which secure the Condenser to the Chassis mounting base 5 Remove the Condenser from cabinet NOTE Throughly evacuate the System to remove mo
10. FOR AR COOLED UNIT CONTACTOR CURRENT RELAYS ES SS DL DS S EE DE ES SE E S E E T fave EEE pe o D o O cuEE ERN COMPRESSOR GEAR MOTOR REDUCER This unit must be grounded Page 40 FIG 7 7 MAR 205 A C 305 W zZ LLI LLI oc 5 zz a 5253 JItmi ac5 am zo mm mozzz FUNCTIONAL ELECTRIC DIAGRAM LNN 03002 div MOY ISNI WI YHOLIVINOD z 3 3 2 XO8 IWNIWHSL HOSS SLO ONINUYM TOHLNOD SSIHd H JOULNOS dual NIG JOULNOD SHISSRd 01 o P n Vrat a d rap L 0G 0ZZ E 09 0E2 13004 U04 VALOJN SIV Idu NOLL JNNOJ SHO LOW NY 4 SHOLSINUSHL 102 Malv3H 3SvVJDANVNHD HJLIMS HJISVHW JOHiNOJ 3HrsSS38d S1300H H31VA 33S 04 10N X BOLOM rnd 4350038 UOLOH uv 3 HOSS 3HdWO This unit must be grounded Page 41 MAR 305 RC FIG 7 8 FUNCTIONAL ELECTRIC DIAGRAM l EE G GREY GV YELLOW GREEN M BROWN N BLACK m S amp L UDLJBLOMdA BOSS2Hd402 E L 5 D e NOL JALONS TWWHEHL 21 8 c amp UL n 2 v i IOULNOJ SSZAd 1H E 4 J s C 5 E JOHINO2 ANSSI 07 I m o E SYOLSWYD AL 02 S x N LU i a E S 5 6 2 x S m uc yn E x S g G a n ju B g E z S 3 E c E g u m u lt q R N g x This unit must be grounded
11. Page 24 4 REFRIGERANT CHARGE WATER COOLED MODELS The below refrigerant charge is approximate When charging set at 15 or 17 bar head pressure according to the model and charge so that frost line extends out of the evaporator two third way to compressor after fifteen minutes of operation AIR COOLED MODELS When charging set at 16 bar 225 psi the head pressure REFRIGERANT CHARGE AND OPERATING PRESSURES MAR 55 75 A A Refrig charge gr 1500 2000 1150 Head press bar 15 17 15 17 Head press psi 212 245 Suction press bar 2 2 1 6 Suction press psi 32 23 5 MECHANICALS A Motor Shaft Pulley MAR units are generally equipped with Step pulley and by changing the belt from one groove to the other the speed of drum can be changed MAR Machines are factory delivered with V belt on smaller dia V groove of step pulley to rotate the evaporator drum at the lowest possible R P M to obtain THICK 2 mm gauge scale ice If step pulley is revolved on motor shaft and V belt is placed on larger dia V groove the evaporator drum R P M increasestothe point to produce THIN 1 mm gauge scale ice R P M R P M for thick ice for thin ice MAR 55 AS WS 0 9 1 25 MAR 75 AS WS 1 1 1 25 MAR 105 AS WS 1 5 2 3 MAR 125 AS WS 2 4 BT MAR 205 AS WS 1 05 1 6 MAR 305 AS 1 6 2 9 MAR 305 WS 1 8 2 9 MAR 105 MAR 125 MAR 205 MAR 305 A W A 4100 2300 5900 15 17 16 15 17 212 245 230 1 9 1 9 2
12. bar 195 psi for MAR 305 Automatic Expansion Valve A E V M O P The automatic expansion valve controls the refrigerant when passing from the liquid line to the evaporator As the pressure decreases on the low side the expansion Valve open and refrigerant escapes into the evaporator drum channel where it absorbs heat from water while evaporating The valve maintains a constant pressure in the evaporator coil when the system is running indipendently of the amount of refrigerant in the system This valve has an adjustment which may be manually regulated to give the evaporator coil the desired amount of refrigerant Turning the adjustment to the left counterclockwise will increase the rate of flow which is controlled by the pressure in the evaporator When the compressor is not running the valve will remain closed as the low side pressure will be high enough to close the expansion valve MAR 55 75 105 125 are generally equip ped with an expansion valve having an orifice of 2 5 mm set for 3 0 bar of pressure MAR 205 305 is also equipped with an expansion valve having an orifice of 4 5 mm set for 3 0 bar of pressure Evaporator Drum Refrigerant inlet outlet takes place on left side journal The drum body is covered by a jacket in special stainless steel resistant to the water corrosion The front edge of the scraping blade must have a clearance of minimum 0 05 mm from cylinder metal jacket Refrige
13. steel or plastic NOT SUPPLIED BY SCOTSMAN FRIMONT MAR 55 75 105 125 1230 500 250 1130 450 300 MAR 205 305 1230 830 250 1130 780 300 9 FINAL CHECK LIST 1 Is the cabinet level 3 IMPORTANT 2 Have all electrical and piping connections been made 3 Has the voltage been tested and checked against the nameplate rating 4 Isthewater supply line shut off valve installed and electrical wiring properly connected 5 Havethe Bin and Cabinet benn wiped clean 6 Have the compressor hold down bolts been en checked to be sure the compressor is floating on the mounting springs 7 Hasthe owner user been instructed on how to operate the ice maker 8 Has the Manufacturer s Registration Card been properly filled out Check for correct Model and Serial numbers from serial nameplate then mailthe completed card to the Frimont Scotsman Europe Factory 9 Checkall refrigerant lines and conduit lines to guard against vibration or rugging and possible failure 10 Is the cabinet in a room where ambient temperatures are a minimum of 5 C 40 F all year around 11 Has water supply pressure been checked to insure a minimum of 1 bar 14 psi and max of 5 bar 70 psi 12 Has the owner been given name and telephone number of the authorized SCOTSMAN Service Agency serving him 10 UNIT INSTALLATION PRACTICE ON NON REFRIGERATED ICE ROOM Power supply line Hand disconnect switch Water supply line hand shut off val
14. to end In case you have an excessive frost back in the suction line and frost starts to form on compressor suction service valve slightly turn clockwise the expansion valve setting stem until the frost back on compressor service valve melts over The suction pressure should range between 0 6 bar and 2 5 bar depending on model water temperature and level See indications on page 26 5 Make sure that the automatic expansion val ve opens and that refrigerant fluid starts to flow through it Page 19 2 WATER AND REFRIGERANT CIRCUIT Compressor Condenser Discharge line Liquid line Heat exchanger 10 Throughly explain the owner user the 11 significant specifications of the MAR ice maker the start up and operation going through the procedure in the operating instructions Answer all guestions about the icemaker by the owner and inform the owner of the name and telephone number of the Scotsman Service station serving him Fit and secure all unit panels previously removed Expansion valve Vapor line Vibration absorbers Drier Condensing water inlet Condensing water outlet Water regulating valve Drum water basin Evaporator drum Refrig lines manifold Scraping blade Float reservoir Spray bar Water pump WARNING Whenever stopping the machine to keep it off operation for some time it is recommendable to shut close the water inlet valve to interr
15. used it depends of storage room arrangement and its inner temperature that must be higher anyway to that of the ice produced In case of a prevailing low themperature below 20 C created by the sub cooled ice that is staging above the ice level which will prevent a positive function of the ice level thermostatic control the thermostatic sensing bulb must be removed from the storage room The MAR ice system are also eguipped with a timer which allows to present the system operations time in relation to the guantity level ofthe ice desired This timer function takes place of the ice level control The timer knob turns counterclockwise and can be set at any point of the dial that goes from O to 24 hours which will correspond to the system operation time Timer dial can be positioned on CONTINUOUS for continuous ice maker function operation or on STOP to interrupt system operations Page 15 8 ICE CHUTE Mar compact unit are supplied without any ice chute however suggested drawing is per the herebelow draft Ifthe outlet of the machine is remote from the bin a chute will be required Stainless steel is an excellent material for this purpose where its cost is not prohibitive Angels or edges of less that 45 should not be used Ice will cling to this surface and either melts excessively or jams in the ice chute The sharperthe drop the better If Straight down do not insulate unless necessary Best material would be stainless
16. 306 Website www scotsman ice com E Mail scotsman europe frimont inet it NOTE Whenever writing please state model no and serial no of the machine Page 3 TABLE OF CONTENTS Section Section Il Section Ill Section IV Section V Section VI Section VII Foreword page 2 Table of contents 3 Specifications MAR 55 75 105 125 4 5 6 Specifications MAR 205 305 7 8 Remote cond 9 GENERAL INFORMATIONS amp INSTALLATIONS Description 10 Unpacking amp Inspection 10 Location amp Levelling 11 Electrical connections 12 Water supply amp Drain connections 12 Remote air cooled condenser installation 13 Ice level control 14 Ice chute 15 Final check list 15 Unit installation practice 15 16 Remote condenser installation practice 17 OPERATING INSTRUCTIONS Start up 18 Water amp Refrigerant circuit 19 PRINCIPLES OF OPERAZION HOW IT WORKS Ice maker 20 Electrical Refrigeration 21 22 23 24 Refrigerant charge 24 Mechanicals 24 ADJUSTMENT amp REMOVAL amp REPLACEMENT PROCEDURES Water regulator assy 25 Automatic expansion valve 25 Water level 25 V Belt change on pulley 25 Compressor replacement 26 Water cooled condens replacement 26 Water regulator replacement 26 Drier replacement 27 Drive motor replacement 28 Gear Box replacement 28 Fiber key replacement 28 MAINTENANCE amp CLEANING INSTRUCTIONS General 29 Ice maker 29 Cleaning instruction 29 30 SERVICE DIAGNOSIS Ice makin
17. 400 R P M with thermal protector IMPORTANT When this motor is discon nected or the entire unit is disconnected it is necessary when resuming the electrical connection to immediately make sure that drive motor rotates clockwise facing the unit front Failure to this may result in wrong rotation of evaporator drum with the risk of major damages to the system C Timer This timer has three functions STOP CONTINUOUS and TIME CLOCK FROM 0 to 24 hours It will be mainly used to pre set the system operation time in relation to the desired amount to ice Therefore it takes the function of an Ice Level Control in the storage area This timer can be remotely located if desired Hi Pressure Cut Out Hand Reset This high pressure control prevents operation at high refrigerant pressure Shuts off entire system in case of waterfailure to condenser on water cooled units and of fan motor failure on air cooled machines Factory cut out setting are air cooled 34 2 bar 480530 psi water cooled 30 bar 420 psi Water Failure Switch This switch used as safety device when low or interrupted supply water conditions are encountered Operates on pressure between supply line and feed line to water reservoir Range is 0 5 bar 7 psi off and 0 8 bar 12 psi on Cuts off complete unit and Resets auto matically Lo Pressure Cut Out Automatical Reset Penn Lo Pressure Control prevents operation at vacuum refrigerant suc
18. E GEAR MOTOR THERMAL PROTECTOR CUT OUT INTERVENTION PROT THERMI GUE MOTEUR REDUCTEUR INTERVENTO PROTETTORE COMPRESSORE COMPRESSOR PROTECTOR CUT OUT INTERVENTION PROTECTEUR COMPRESSEUR Page 22 If the stoppage is caused by its refrigerant pressures oroverloading inthe compressora red light glows Both controls that activate the red lights are manual reset type controls therefore the cause of the stoppage should be diagnosed and corrected before reoperating the ice maker MAR 205 305 O O RITARDATORE AVVIAMENTO IN FUNZIONE STARTING TIME DELAY CONTROL ON RETARDATEUR DEMARRAGE EN FONCTION INTERVENTO INTERRUTTORE BOCCHETTA SPOUT SWITCH CUT OUT COUPURE PAR INTERV MICRO GOULOTTE INTERVENTO TERMOSTATO MAGAZZINO ICE LEVEL CONTROL CUT OUT COUPURE PAR INTERV THERMOSTAT CABINE INSUFFISENT PRESSIONE MANDATA ECCESSIVA EXCESSIVE HI PRESSURE H PRESSION EXCESSIVE PRESSIONE DI ASPIRAZIONE INSUFFICIENTE LOW SUCTION PRESSURE B PRESSION INSUFFISENT INTERVENTO PROTETTORE COMPRESSORE COMPRESSOR PROTECTOR CUT OUT INTERVENTION PROTECTEUR COMPRESSEUR PRESSIONE ACGUA IN SUFFICIENTE LOW WATER PRESSURE PRESSION D EAU O Page 23 J Water Cooled Condenser Tube within a tube condenser Water Regulating Valve Penn made Valve must be set to maintain head pressure at 17 bar 240 psi for MAR 55 75 15 bar 210 psi for MAR 105 125 16 bar 225 psi for MAR 205 and 14
19. ONDENSER AND PRECHARGED REFRIGERANT LINES INSTALLATION MAR 305 ONLY Use the following for planning the placement of the condenser relative to the ice machine hd Remote Condenser Condenser Distance amp Located ABOVE Location Ice Machine Schematic Remote Condenser Located BELOW Ice Machine Location Limits condenser location must not exceed ANY of the following limits e Maximum rise from the ice machine to the condenser is 3 physical meters e Maximum drop from the ice machine to the condenser is 1 physical meter Physical line set maximum length is 6 meters Line set length maximum is 9 meters Calculation Formula Drop dd x 6 6 dd distance in meters Rise rd x 1 7 rd distance in meters Horizontal Run hd x 1 hd distance in meters Calculation Drop s Rise s Horizontal Run dd rd hd Calculated Line Length Configurations that do NOT meet these requirements must receive prior written authorization from Scotsman Do NOT e Route a line set that rises then falls then rises e Route a line set that falls then rises then falls Calculation Example 1 The condenser is to be located 0 9 meter below theice machine andthen 3 meters away horizontally 0 9 mt x 6 6 5 94 328 94 This location would be acceptable Calculation Example 2 The condenser is to be located 4 meters above and then 3 meters away horizontally 4x1 7 6 8 6
20. SERVICE MANUAL MAR 55 MAR 75 MAR 205 SCOTSMAN Page 2 FOREWORD The MAR ice makers make flake ice of scale type which is flat hard dry and sub cooled giving to it an exceptional staying power for multiple chilling operations The design simplicity accounts for the confidence in MAR scale ice machines Their ice making system has only one sealed moving part resulting in a minimum of maintenance operations for continuous reliable machine service Ice is discharges through a large opening on the back of unit cabinet when mounted on top of the refrigerated room ice is gravity fed to storage area Rugged solid heavy duty the stainless steel MAR cabinet has removable panels that facilita te the accessibility to mechanical and electrical parts A console panel with lights monitoring water flow pressure and temperature operating refrigerant pressure and motors overloading forewornthe system malfunction before becoming major trouble We suggest you to take time now to read this manual which contains a lot of valuable informations on the MAR ice making system If you have any further queries regarding the care or operation of the machine please contact SCOTSMAN ICE SYSTEMS SCOTSMAN EUROPE FRIMONT SPA Via Puccini 22 20010 Bettolino di Pogliano Milano Italy Tel 39 02 93960 1 Aut Sel Telefax 39 02 93550500 Direct Line to Service amp Parts Phone 39 0331 589305 Fax 39 0331 584
21. WARNING The compressor is equipped with a crankcase heater which has to be energized even when the ice maker is switched off So make sure to connect the unit with the compressor crankcase heater constantly energized After long inoperative periods remember to give current to the heater 4 hours before the ice maker start up Fuse protection of the unit should be made as follows MAR 55 75 105 125 3x16 Amps 400V MAR 205 3x24 Amps 400V MAR 305 3x32 Amps 400V WARNING The evaporator drum drive motor is threephase so atthe unit startup care must be taken to ensure of the correct rotation direction of drum Incase of wrong roration interchange the phases by interchanging the lead wire connections of main cord 5 WATER SUPPLY AND DRAIN CONNECTIONS Separate water supplies are recommended A Evaporator or ice making supply water should be run through a hand shut off valve before entering unit Evaporator supply water connection has a 3 4 male pipe fitting This line also has factory installed water strainer internally mounted Incoming water goes through the float reservoir and then to the drum reservoir Connect to a good cold water supply with minimum 1 2 O D line A check valve on this line will be required in some cases depending on local plumbing codes The recommended minimum water pressure is 1 bar 14 Psi Do not operate this unit with fresh water supply below 1 bar 14 Psi Maximum water pressure 5 ba
22. When the seal mechanism spring has been partially compressed fit the other two screws and full compress the spring by screwing down gradually the three tightening point After have tightened the screws unloose the tie rod screw and replace it with the third one Clean carefully the inner surface of refrigerant manifold Check to see the good condition of the seal ring 8 and fit itin its seat inside the refrigerant manifold Fit on shaft end the washer 12 which keeps in place the seal ring 13 inside the refrigerant manifold and fit inside the manifold the gasket Position the manifold on the six monting studs fit the six mounting nuts and washers and tighten all them down by means of a 10 mm wrench Connect the outlet refrigerant line to the corresponding port ofthe manifold andtighten it with the four head necessed screw Connect the refrigerant inlet line on its manifold fitting and tighten the fitting flarenut 10 REMOVAL AND REPLACEMENT OF THE DRIVE MOTOR To remove the drive motor assembly Remove screws and front top and right side panels Slid off V belt from motor pulley Unloose and remove hex head screw securing the pulley to motor shaft Disconnect wire leads to motor Remove two hex head bolts lockwashers and washer and nut which attach the sleigh support plate of motor to the side frame of evaporator drum basin Liftthe sleigh plate with the drive motor out of the Chassis
23. ast approx 5 minutes At the end dump solution again as 12 Open a little bit the float valve holding arms per step 5 Seal plug with food grade silicon and remove it from the holder E 26 Unlock the float valve adjusting screw 13 Remove screws and clip ring securing float valve bracket to the nozzle 27 Replace again evaporator cover antop panel 14 Withdraw bracket from float valve nozzle 28 Reconnect unit to the power Page 31 SECTION VI SERVICE DIAGNOSIS The following chart lists corrective actions for the causes of known symptoms of certain problems that can occur in the ice makingrefrigerarion system TheService Diagnosis Section isfor use in aiding the servicemen in diagnosing a particular problem for pin pointing the area in which the problems lines thus an ever available reference for proper corrective action 1 SYMPTON POSSYBLE CAUSE ICE MAKING REFRIGERATION SYSTEM 2nd Red Light glows intermittently Lo refrigerant press ard Red Light glows intermittently Lo water pressure The unit does not make ice The compressor runs but no ice is made 1st Red Light glows Hi pressure excessive Incorrect refrigerant suction pressure Moisture in system Overcharge of oil in system Not enough refrigerant No water in drum basin Intermittent water supply or too low water pressure Fiber key in gear reducer bore broken V belt loose or broken Gear in gear box stripped Pulle
24. ation Specially built bins can provide proper support and allow for a servicing platform WARNING Air Cooled version of MAR 75 MAR 105 MAR 125 and MAR 205 have the condensing air exhaust throughout the lower rear area ice spout side therefore it is necessary to avoid to position the ice maker with the rear side against any sort of wall that will prevent proper warm air dissipation They must have on their rear side an air gap of 200 m m MAR 55 has the air cooled condenser on the right side while MAR 305 has a se parate remote air cooled condenser See instructions for remote condenser at 6 CONDENSING AIR FLOW SCHEMATIC MAR 105 125 MAR 205 MAR 55 75 MAR 55 75 sg o Um pu r m FRONT SIDE MAR 105 125 MAR 205 2 Erection For elevations in excess of four feet or in close quarters chain falls of fork lift truck should be used For location under four feet the use of skid boards and rollers is practical 3 MachineSite Whenselecting the permanent location of air cooled machines consideration must be given to volume size of the room and to ventilation facilities for easy heat removal around the machine In doing this it worths to take on account that MAR 55 AS has a condenser heat rejection of 3000 Kcal hr and fan motor draws air for 1200 m h MAR 75 AS has a condenser heat rejection of 4900 Kcal hr and fan motor draws air for 1200 m h MAR 105 AS has a c
25. bar 26 psi MAR 55 75 WS 1 6 bar 22 psi MAR 105 125 AS WS 1 9 bar 27 psi MAR 205 AS WS 1 0 bar 14 psi MAR 305 AS 0 75 bar 10 psi MAR 305 WS Depending upon water inlet temperature 10 11 12 13 14 15 16 17 WON Check setting and function ofallthe pressure controls also make sure that their corresponding lights will glow Check drive motor operation Normal operating temperatures are about 60 C 160 C which is hot to touch Check with amperometer Amps drawn Check V beltfor concealed signs of wear and that has the correct tension Check pulleys alignements and also that drive motor and gear box hold down bolts are tight enough Make sure that water lines in water cooled condenser are free from any excess of water minerals otherwise arrange to clean the tubes with a power driven wire brush or running through it a weak acid solution made with 20 percent of hydrocloric acid Check for refrigerant leaks and for proper frost line which should frost out of accumulator at least half way to the compressor and in some areas back to service valve Check for water leaks Tighten drain line connections Pour water down drain to be sure that drain line is open and clear Checkthe quality of ice Ice flakers should be dry and have a thickness gauge of about 1 5 2 0 m m Check the thermostatic Ice Control Bulb whenever used location and thermostatic function Check compressor oil leve
26. ce making capacity ICE PRODUCED PER 24 HRS SPECIFICATIONS MAR 105 AIR amp WATER COOLED MODELS AIR COOLED MODELS THICK SCALE ICE THIN SCALE ICE WATER COOLED MODELS Kg 24 h eC Kg 24 h 750 700 650 600 550 AMBIENT TEMPERATURE ICE PRODUCED PER 24 HRS 500 450 WATER TEMPERATURE MAR 125 800 750 700 650 600 550 WATER TEMPERATURE AIR amp WATER COOLED MODELS AIR COOLED MODELS Kg 24 h C 1000 10 950 900 850 750 AMBIENT TEMPERATURE 650 600 WATER TEMPERATURE NOTE Daily ice capacity is directly related to condenser air water inlet temperature water temperature to make ice and age of machine To keep your SCOTSMAN MAR performing at is maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual THICK SCALE ICE THIN SCALE ICE DE 10A 38 AMBIENT TEMPERATURE 76 34 31 64 237 395 MAR 55 75 105 125 SPECIFICATIONS 21 24 13 32 50 4 59 64 TI 9000290 180 7 18 9 888 34 31 32 60 2 23 64 o 275 10 53 64 u L 5 o Z x x R E E E Uv N eile a S m DIMENSIONS DIMENSIONI MODELLO MODEL C Water req l h fen QUAM Total Amps Prod wire size 400 V 225 m 2 25 8x15 300 rm 35 35 45 45 NO Ca a gt BR BR BR CO Rio N NV O
27. denser refrigerant line path is substantially less than the lenght of pre charged refrigerant lines to be installed route and dress the excess refrigerant line as follows Follow straight line routing when possible Retain excess pre charged refrigerant line inside the building Page 14 3 Spiral the excess lenght of the precharged refrigerant lines in the best selected inside location and in a manner that prevents refrigerant trapping EXCESS REFRIGERANT LINES COILED FOR VERTICAL DRAIN LOCATED WITHIN BUILDING EXCESS a VERTICAL SPIRAL WITH CONSTANT R INCLINED DRAIN v PROPER COIL CAUTION DO NOT kink or crimp the refrigerant lines DO NOT bend excess refrigerant lines in a vertical loop s which allow trapping of refrigerant in LOW sections during OFF time Bend and shape excess refrigerant lines in VERTICAL spirals not HORIZONTAL spirals See Figure above 7 ICE LEVEL CONTROL The MAR flake ice system are equipped with and adjustable thermostatic control that cutsoff ice making operation when its sensing bulb gets in contact with the ice deposited in the storage bin The temperature range dial goes from 10 C to 35 C and its long capillary 3 5 m attaching the liquid filled bulb should be conveniently positioned in the storage room at the desired height by holding it with an appropriate bracket to be arranged in accordance with the location possibilities These controls may or may not be
28. dure for maintenance and cleaning are given as guides and are not to be construed as absolute or invariable Cleaning especially will vary depending upon local water conditions and the ice volume produced and each ice maker must be maintained individually in accordance with is own particolar location requirements 2 ICEMAKER THE FOLLOWING MAINTENANCE MUST BE SCHEDULED AT LEAST TWO TIMES PER YEAR ON THIS ICE MAKER CALL YOUR AU THORIZED SCOTSMAN SERVICE AGENCY 1 Checkand clean water line Strainer in water inlet fittings 2 Remove top panel and evaporator cover depress the float to ensure that a full stream of water enters Drum Reservoirs 3 Check that the ice maker cabinet is level in side to side and front to rear directions 4 Checkthat the water level in the drum basin is high enough to surround the wanted portion of revolving drum max water level is 115 120 mm for MAR 55 75 105 125 and 90 95 mm for MAR 205 305 5 Clean the drum basin and exterior of the drum assembly using a solution of SCOTSMAN Ice Machine Cleaner Refer to procedure VI 3 CLEANING ICE MAKER NOTE Cleaning requirements vary according local water conditions and individual user operation 6 When doubtful about refrigeration charge check gauge for compressor head pressure Please refer to the operating pressures as printed on page 26 7 Check gauge for Suction Line Pressure which varies between 2 2 bar 32 psi MAR 55 75 AS 1 8
29. e above 40 C 100 F Under or over charge of refrigerant Closed AEV Faulty compressor valve plate Loss of refrigerant under or overcharge of refrigerant Plugged condenser water tubes Low water level in the reservoir Overcharge of oil in system Replace fuse and check for cause of blow fuse Check wiring Turn switch to ON Replace switch Check ice chute arrangement Replace contactor Aligne V belt Tighten Repair or replace Loosen hold down bolts Set water level as shown on page 27 Remove blade amd melt up ice formation Adjust water level as shown on page 27 Open water valve Adjust Purge off Correct or move unit to cooled location Re charge with proper amount Adjust valve for correct refrigerant flow Repair or replace Check and recharge with proper amount of refrigerant Clean condensor Check float valve operation Check at oil sight glass Lower to 1 2 sight glass Page 33 SECTION VII WIRING DIAGRAMS This section is provided as an aid in under standing the electrical circuit of the Mar Flaker The Wiring Diagrams in this Section are Figure 7 1 Wiring Diagram MAR 55 WS and AS Figure 7 2 Wiring Diagram MAR 75 105 125 WS and AS Figure 7 3 Wiring Diagram MAR 205 AS WS and MAR 305 WS Figure 7 4 Wiring Diagram MAR 305 RC Figure 7 5 Functional Electric Diagram for MAR 55 Figure 7 6 Functional Electric Dia
30. eather proof Page 10 SECTION I GENERAL INFORMATION amp INSTALLATION 1 DESCRIPTION An attractive compact cabinet of stainless steel with control panel lights on the front All panels are removable to allow easy access to electrical and mechanical components for cleaning and maintenance Sealed Refrigeration System To provide quite efficient operation of the ice maker the compressor is mounted on rubber cushions The water cooled models have a tube within tube condenser with water regulation val ve for correct condensing water flow The air cooled models except the MAR 305 have a built in condenser in copper and aluminium with the fan motor controlled by pressure control The evaporator drum is powered by a separate drive motor connected by a V belt and pulley system to adouble gear box Therefrigerantusedis R 404a controlled by automatic expansion valve Storage Bin or Ice Room Since the MAR Flaker is a continuous flow type ice maker and does not have its own attached storage bin itis necessary to use an auxiliary bin or a pre fabricated ice room for appropriate ice storage Ice storage situations are of two kinds a Short term storage b Extended terms storage Being as stated scale ice made by MAR machines flat dry and subcooled therefore with the tendency to stick toghether particular attention is required for proper ice storage conditions for better ice handling An insulated ice storage bin or rooms i
31. ed Models Adjustements can be performed on the Water Regulator Assembly to increase or decrease the head pressure To adjust the Water Regulator Assembly A To INCREASE the Head Pressure rotate the adjusting screw on the Water Regulator Assembly IN or CLOCKWISE B To DECREASE the Head Pressure rotate the adjusting screw on the Water Regulator Assembly OUT or COUNTERCLOCKWISE 2 ADJUSTMENT OF THE AUTOMATIC EXPANSION VALVE The end to end frost on evaporator drum is the result of the correct expansion valve setting This valve may be manually regulated by means of the adjusting stem Turning the adjustment to the left counter clockwise will increase the rate if refrigerant flow Turning the adjustment to the right clockwise the refrigerant flow to the evaporator is reduced Use hex head wrench for manual adjusting operations 3 ADJUSTMENT OF WATER LEVEL IN DRUM BASIN 1 Remove top panel 2 Remove drum basin cover 3 Locate on the drum basin the small float valve 4 Unloosetwo screw offloat valve support plate and move up or down the float valve to correct water level position in drum basin Remember 115 120 mm is the correct water level for MAR 55 75 105 125 and 90 95 mm is correct for the MAR 205 305 AS WS WARNING Be sure the electrical power supply and water supply are OFF before starting any of the following REMOVAL AND REPLACEMENT procedures as a precaution to prevent possible personal inj
32. ent Drier is installed with the arrow positioned in the direction of the refrigerant flow 1 Remove the factory seals from the replacement drier and install the drier in the refrigerant lines with the arrow positioned in the direction of the refrigerant flow 2 Solder the refrigeration lines at each end of drier 3 Purge the system and check for leaks 4 Throughly evacuate the system to remove moisture and non condensables Page 27 5 2 Charge the system with refrigerant by weight SEE NAMEPLATE Re mount all Service Panels INSTRUCTION FOR REMOVAL AND REPLACEMENT OF REFRIGERANT MECHANISMS OF SCOTSMAN ICE MAKERS MAR SERIES Before removing the refrigerant manifold it is necessary at first to close the valve on liguid line Upon low pressure switch cut off the main switch must be put in OFF position then it is necessary to purge the refrigerant system After these operations the flare fitting at the inlet of refrigerant manifold can be disconnected as shown Remove the 4 allen screws of refrigerant outlet fitting to manifold Unloose and remove the 6 nuts with respective washers that secure the refrigerant manifold 1 When removed the refrigerant manifold unloose and remove one of the three screws 11 securing the seal mechanism ring to the drum shaft journal Fitin place of it the screw of 4 MA supplied in the kit then tighten its nut Gradually unloose the tw
33. er supply line and the MAR water system against winter freezing If cooling tower is used several precautions should be observed too 1 Leave water regulating valve in the system 2 Separate the make up water for the reservoir from the tower water 3 Use 3 4 tower water lines or larger depending on the lenght of run Over 30 feet use 1 O D lines 4 NOTICE a cooling tower can freeze in the winter time and the MAR flaker will be in operation 12 months per year An indoor tower andpumpcan be used with outdoors air ducted in and out if the fan cycles on water tempera ture to prevent freezing An indoor sump can be used An auxiliary tower and city water hook up will prove satisfactorily in some climates Fresh water in the winter and tower water during the summer Consult your tower and pump manufacturers for proper sizing In no event should less than a Nominal 3to 4 tons tower orless than 3 4 HP high pressure tower or less than 3 4 HP high pressure tower pump be used C Drain When not re used The recommenden tubes for the condenser waste line are MAR 55 75 3 4 GAS female fitting MAR 105 125 12 mm LD MAR 205 305 25 mm L D Page 13 Water drip tray drain line is 21 m m I D Tube to be connected with clamp to a 21 m m hose barbed fitting for all models Waste water line must run to an open trapped vented drain If drain is a long run allow a pitch of 3 cm per meter 6 REMOTE AIR COOLED C
34. g Refrigerant system 31 32 WIRING DIAGRAMS 30 MAR 55 Wiring diagram 34 MAR 75 105 125 Wiring diagram 35 MAR 205 Wiring diagram 36 MAR 305 RC Wiring diagram 37 MAR 55 Functional electric diagram 38 MAR 75 105 125 Functional electric diagram 39 MAR 205 A C Functional electric diagram 40 MAR 305 RC Functional electric diagram 41 Page 4 SPECIFICATIONS MAR 55 AIR amp WATER COOLED MODELS ice making capacity minsen AIR COOLED MODELS WATER COOLED MODELS Kg 24 h Kg 24 h oc 500 500 E 450 u L 450 8 zE gt IL x E x q 400 q 400 LLI LLI LLI am QA am D 350 Q 350 O O gt 5 A A O 300 Z O 300 GC LI GC A to am O 250 O 250 200 200 38 32 27 21 15 10 5 C 38 32 27 21 15 10 5 C WATER TEMPERATURE WATER TEMPERATURE MAR 75 AIR amp WATER COOLED MODELS ice making capacity 2222222 TN seaE icc AIR COOLED MODELS Kg 24 h oC 540 500 460 420 380 AMBIENT TEMPERATURE 340 ICE PRODUCED PER 24 HRS 300 WATER TEMPERATURE NOTE Daily ice capacity is directly related to condenser air water inlet temperature water temperature to make ice and age of machine To keep your SCOTSMAN MAR performing at is maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual AMBIENT TEMPERATURE Page 5 Ice making capacity ICE PRODUCED PER 24 HRS I
35. gram for MAR 75 105 125 Figure 7 7 Functional Electric Diagram for MAR 205 A C 305 W Figure 7 8 Functional Electric Diagram for MAR 305 RC WARNING When conducting a continuity check of the MAR Flaker 1 Disconnect the main power source 2 DO NOT use an incandescent lamp or jumper wire conduct all tests with a voltohm meter Page 34 FIG 7 1 MAR 55 WS and AS WIRING DIAGRAM SLHBI1 ONINAVM 100 10 001721099 HdWNOJ inQ 1n 10d WWH3SHL HO10M HV 3D LNG Ln 10HiNQ 13431 32 MOT 001 SS3Hd AJIVM 3HnSS3Hd 3 4l98532X 3 ONILVH3dO 3NIHJVIW K QS TIQHINDO SS3Hd IH 7OHiNOJ dW3l NIG OH1NOO SS3Hd OZH O11 HILIMS LAOS U I SAN IH INJHUNI YOLIVINOD This unit must be grounded Page 35 MAR 75 105 125 WS and AS FIG 7 2 WIRING DIAGRAM A BLUE B WHITE G GREY GV YELLOW GREEN M BROWN N BLACK 3 5 x 2 OP 0 g lo g p E g 5 g g _E is i H B v pe 4X S amp i i ony i j i TERMINAL BOARD This unit must be grounded Page 36 MAR 205 AS WS and MAR 305 WS FIG 7 3 WIRING DIAGRAM A BLUE B WHITE G GREY GV YELLOW GREEN M BROWN N BLACK 3 2 S 5 s 8 g 5 5 D g G s 0 5 E fg 3 D a TT i o dh df jl N ix ovp coe 5 ip pur seid E 5 an coment me GEES Ge eee oo GE Qe Ae e
36. he horizontal scraping blade The scraping blade of heavy duty metal cause the peels off of the ice sheet formed on the drum jacket by racking it while it advances on the revolving drum The ice sheetis 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 line through the bore of the head manifold on the left side cylinder The refrigerant sealing in the manifold is assured by an especially designed sealing device The cylinder is driven by a separate drive motor and gear reducer located on the right side Four motors are constantly in motion a the compressor b the drive motor c the fan motor d water pump The gear reducer the driving belt with its pulley and the revolving drum with the rotating part of the sealing devices are the mechanical parts in motion 2 PRINCIPLES OF OPERATION HOW IT WORKS Water drawing area Water sprayed freezing cooling area Sub cooling area Water reservoir float valve Water feeding line Scraping blade Spray bar Water reservoir Revolving drum Water pump Water drain hole 1 2 d 4 5 6 7 8 9 0 1 1 1 9 Page 21 3 ELECTRICAL REFRIGERATION The electrical circuit consists of the compressor motor drive motor water pump condenser fan motor and control on air cooled version main c
37. inet base and check that the location source voltage corresponds with the voltage specified on the dataplate CAUTION Unproper voltage supplied to the icemaker will void your parts replacement program 11 Remove the Manufacturer s registration Card from its envelope and fill in all spaces including Model Number and serial Number taken from the aluminium plate located on the front of the Chassis base with Front Panel removed Forward the completed self addressed registration card to the Scotsman Europe Frimont Factory 3 LOCATION AND LEVELLING WARNING The MAR Flakers are NOT designed for outdoors installation where air temperature are below 5 C 40 F or above 40 C 100 F and the water tempe rature is below 5 C 40 F or above 40 C 100 F Extended periods of operation at temperatures exceeding these limitations will constitute misuse under the terms of the SCOTSMAN Manufacturer s limited warranty coverage 1 Stands A special stands should be built if the machine is located beside the bin Care should be exercised in making the stand strong enough to support the weight In designing the stand plan for the servicing of the machine from front top and sides It is also possible to locate the machine on top ofthe bin Care should be usedin selecting a bin that has been specially reinforced otandard bins are usually not sufficiently reinforced for this purpose An unsteady platform will cause excessive vibr
38. isture and non condensable Page 26 B To replace the Condenser reverse the removal procedures 7 REMOVAL AND REPLACEMENT OF THE WATER REGULATOR ASSEMBLY Water cooled Models A To remove the Water Regulator Assembly 1 Recover the refrigerant from the system and transfer itin a bottle so to reclaim or recycle it 2 Unsolder the capillary line from the Water regulator assembly where connected at the process header 3 Disconnect the water inlet line at the rear of the water regulator 4 Disconnect the condenser water inlet tube at the front of the water regulator 5 Remove two screws lockwashers and washers which attach the Water Regulator Assembly bracket to the Chassis base and remove the Water Regulator Assembly and bracket NOTE Throughly evacuate the System to remove moisture and non condensables B To replace the Water Regulator Assembly reverse the removal procedures 8 REMOVAL AND REPLACEMENT OF THE DRIER A To remove the Drier 1 Recover the refrigerant from the system and transfer itin a bottle so to reclaim or recycle it 2 Unsolderthe refrigeration lines at each end of Drier and remove the Drier B To replace the Drier CAUTION 1 If the factory seal is broken on the replacement drier exposition it to the athmosphere more than a few minutes the Drier will absorb moisture from the atmosphere and loose substantial ability for moisture removal 2 Be sure the replacem
39. ith 8 liters 272 oz of warm potable water NEVER MIX THE CLEANING WITH SANITISING SOLUTION Soak float valve and bracket in the sanitizing solution for 1 minute then rinse all parts with fresh water WARNING When using any chemical protection of hands gloves SCOTSMAN Ice Machine Cleaner contains phosphoric and Hydroxiacetic acid These compound are corrosive and may cause burns if 20 19 Install again first the plastic bracket then float valve Open the water supply shut off valve swallowed DO NOT induce vomiting Give large amount of water or milk Call 21 Physician immediately In case external contact flush with water KEEP OUT OF THE REACH OF CHILDREN 22 Leave water filling until the level inside the basin teachs approx 8 9 cm 3 4 Lock in again float valve screw Connectthe machine to the power and letthe unit in operation for about 5 minutes for rinsing the water system 7 Slowly pour 90 of the solution in the 23 evaporator basin 8 Connectthe machinetothe power and letthe unit in operation for about 10 minutes CAUTION DO NOT use ice produced from the cleaning solution Be sure none 9 Disconnect again unit from power falls into storage room 10 Repeat 5 24 Disconnect unit from power 11 Close the water supply shut off valve externally connected onto the water inlet 25 F Repeat 6 them pour sanitizing solution in the ine drum basin sanitizing should l
40. l through sight glass where used Stop unit operation and after 10 see that oil level is 2 3 millimeters above center line of sight glass Be surethat plexiglass chute at spout opening is securely fastened with is hold down button and that its surface is smooth and clean from any water mineral deposit CLEANING INSTRUCTION Disconnect power front the unit Remove screws and top panel Hemove evaporator cover panel Lock the float valve adjusting screw to avoid water incoming during the operation of machine Make sure that during cleaning no ice will be stored in any bin or cooling room in order to avoid any kind of contamination by cleaning solution MAR 55 75 105 125 2 It 68 ounces of Scotsman Ice Machine cleaner with 16 liter 540 ounces of water for MAR 205 305 2 5 It 85 ounces of Scotsman Ice Machine cleaner with 20 liters of water 680 oz Page 30 Place the float valve and its bracket in the solution remained in the bucket and remove any kind of scale or mineral deposit 16 Carefully rinse bracket and float valve by 5 Dump the contents from the drum basin by fresh water withdrawing drain plug located at the bottom refrigerant side ofthe evaporator Once empty 17 Prepare as per step 6 using a sanitizer place again plug in its seat rather than a cleaner Possible sanitizing solution may be made by mixing 3 cl 1 oun 6 Prepare a solution in a bucket by mixing for ce of liquid house hold bleach w
41. o remaining screws and the nut till release the spring of seal mechanism Unloose the last screw to remove the seal mechanism ring as well as the seal mechanism S S ring and its spring Withdraw entirely the stainless steel ring 6 that houses the graphitic seal ring Check to see the surface conditions of cylinder shaft journal It is of extreme importance that this surface be clean smooth and polished In case of scored surface it is necessary to stroke on it a very fine sand paper stripe Check to see that washer 5 be properly clean and positioned with keyway to match the key E NI fiil Ji i In CATES 7722 L T ZT ils T rr G J j U Y oL _ m L7 S NN 20 If necessary replace the 0 rings of the S S ring that houses the graphitic ring Proceed attentively to examine the graphitic sulface of the seal ring If this surface is no more perfect and optically flat proceed to replace the seal ring in the following way Lubricate the outer surface of the new seal ring with compressor oil and place it at the inferior of the housing ring Place on drum shaft the steel ring housing the graphite Mount on drum shaft journal the remaining portion of seal mechanism S S ring and spring 9 then the seal mechanism ring 10 Fit the screw of 4 MA with its nut in one of the three threaded holes then screw down the nut in order to compress the spring
42. ondenser air water inlet temperature water temperature to make ice and age of machine To keep your SCOTSMAN MAR performing at is maximum capacity it is necessary to perform periodic maintenance as outlined on page 29 of this manual AMBIENT TEMPERATURE MAR 205 305 SPECIFICATIONS 180 7 ve 34 6V64 888 WATER OUTLET WATER INLET ELECTRICAL POWER 21 53 64 3 5 GAS 1296 51 132 MODELLO MODEL MAR 705 9 20 210 205 165 pos 3168 8 17 64 B 5 64 6 VZ 63 64 25 63 64 MODELS Cond Compr Water req h Power Minimum Total Amps EHE HP Cond Prod KW wire size mm 400 V MAR 205 AS Ar 5 Je 7 5x25 7 MAR 205 WS Page 8 D WATER OUTLET WATER CODLED ONLY E WATER INLET WATER COOLED ONLY Shipping weight Stainless 824 Steel Finish var 305 as Ar 15 88 10 5x4 20 Stainless MAR 305 WS BASIC ELECTRICALS 400 50 3N at 21 C amb 15 C water temp Ste Page 9 MAR 305 REMOTE CONDENSER FN s M S S i eo nm i i f REX Ne 15 518 joco 5 8 d I i 9 ne 600 15 3 47 gc 650 3 50 210 i 81 47 20 ke 0 x QS 1 2 E S 1095 43 1 87 E Ss GAS AIR COOLED TECHNICAL SPECIFICATIONS CONDENSER CAPACITY FAN MOTOR AIR FLOW 16200 Kcal h 230V 0 7A 4 x 1200 m h NOTE MAR 305 is not for out door installation Fan motors are not w
43. ondenser heat rejection of 7500 Kcal hr and the two fan motors draw air for 1200 m h each MAR 125 AS has a condenser heat rejection of 9750 Kcal hr and the two fan motors draw air for 1200 m h each MAR 205 AS has a condenser heat rejection of 11000 Kcal hr and the two fan motors draw air for 2000 m h each MAR 305 AS has a condenser heat rejection of 16200 Kcal hr and the four fan motor draw air for 1200 m h each correspondind to 4800 m h in total 4 Position the MAR in the selected permanent location level the cabinet on both the left to right and front to rear directions The levelling legs can be adjusted with an opened wrench See unit layout and dimensions at page 20 4 ELECTRICAL CONNECTIONS The machine has been wired ready for electric connections See nameplate for current reguirements to determine wire size to be used for electrical hook up The MAR flaker reguires a solid earth ground wire See wiring diagram Be certain the unit is connected to its own electrical circuit and individually fused The maximum allowable voltage variation should not exceed ten percent of the nameplate rating even under starting conditions Low voltages can cause erratic operation and may be responsible for serious damage to the overload switch and motor windings All external wiring should conform to the National State and local electrical permit and services of a licensed electrician will be required
44. ontrols ON OFF compressor Switch Timer Contactor safety controls Thermal protection for compressor Hi and Lo pressure switches water failure switch A Compressor unit see Technical Specifi cation Table for H P The compressor used on the MAR 55 75 105 125 is hermetic reciprocating type compressors while on MAR 205 and 305 is semihermetic type All of them operating with R 404a Al compressors are equipped with a crankcase heater element and are thermally protected Coolingis achieved with refrigerant passing through suction valve and by a sepa rate fan motor on water cooled version only a Compressor Crankcase Heater Must be constantly energized particularly during OFF period of ice maker operations The temperature provided by the heating element into the crankcase prevents that refrigerant dilutes with oil b Compressor Thermal Protector Thermistor on MAR 205 and 305 A thermistor is a solid state semiconductor which permits or allows more electrons to flow throught it as the material s temperatu re increases Today thermistors are used in place of a bimetal strip or in place of a temperature sensitive power element as a safety device in electric motors by stopping the electric power flow to a motor if the motor windings temperature increases to the danger point B Drive Motor The evaporator drum drive motor is a three phase motor of 1 2 HP wired for 400 230 Volts 50 60 Hz 1 2 2 1 Amps 1
45. r 70 Psi B The condenser water supply line connects to the following fitting sizes MAR 55 75 3 4 gas male MAR 105 125 12 mm OLD fitting MAR 205 20 mm O D fitting MAR 305 25 mm Page 12 Water supply line size must be adequate to water flow which at 15 C temperature water is 225 lt hr for MAR 55 300 It hr for MAR 75 480 It hr for MAR 105 It hr for MAR 125 1200 It hr for MAR 205 1600 It hr for MAR 305 Incoming water goes throughout the water regulating valve first and then to the water cooled condenser Observe arrow on water regulating valve Water supply mustbe installed to conform with local code In some case a licensed plumber and or a plumbing permit will be required Water Quality Water quality is a factor of extreme importance for good operation of MAR machine Water shouldn t be too hard neither too soft Hard water will tend to create mineral deposits in water reservoir evaporator drum and scraping blade rendering rough the chute surface which prevents ice scales from sliding properly into ice channel On the contrary water too soft de mineralized will cause the ice skin to stick excessively on drum surface rendering difficult the scraping operation of same The ideal water should have a total hardness of about 15 20 french degrees Precaution Against Water Frost Like for any other ice maker all necessary measures must be taken when the cold season is approaching to protect the wat
46. rant Seal System Housed in the refrigerant inlet outlet manifold located on the evaporator drum left side journal is a leakproof joint This joint is made with seals that are carefully designed and installed The seals usetwo rubbing surfaces One surface tourns with the cylinder journal and is sealed on it with on O ring of synthetic material The other surface is stationary and fitted in its housing with leak proof O ring Therubbing surfaces optically flats aremade of two different material that are hardenend steel for the rotating ring and graphite for the stationary ring The rotating parts are a the clip retainer ring b the spring collar c the compression spring d the stainless steel seal ring with O ring The stationary parts are a the graphitic ring with O ring b the stainless steel housing ring with gasket and O rings Heat Exchanger A heat exchanger is mounted in the suction and liquid line to reduce flash gas in the liquid line to reduce liquid refrigerant in the suction line andto subcoolthe liquid refrigerantthereby increasing the operating efficiency Sight Glass A sight glass is installed in the liquid line The sight glass will show bubbles if the system is low on refrigerant Filter Drier All MAR units mount a Solid core antiacid filter drier on liquid line This drier may be installed in any position provided that the arrow on its body point in the direction of refrigerant flow
47. s always required then according to ice end use application this can be refrigerated on non refrigerated Also a weight volume ratio of 2 1 cu mt per ton must be taken into consideration for correct ice storage a Non refrigerated room for short term storage The scale ice is produced continuously for 24 hours per day whereas the use period is generally for no longer than 8 hours per day Therefore storage facilities should be provided to accomodate a minimum of 16 hours of production this means that every scale ice machine must be installed with a properly insulated storage room which should have a minimum capacity of 2 3 the daily ice production With a well insulated room and duly subcooled scale ice the limited losses of heat throught the walls of a properly designed room with adequate arrangements are largely offset and excess melting will not occur In most situations where whole quantity of ice produced is being used on adaily basis itis not necessary to provide cooling for the ice storage room Refrigerated room for extended storage and long distance conveying When scale ice is to be transported at a considerable distance such as aboard fishing vessels or in locations with normal ambient temperatures conditions or when used in industrial plants where demandis intermittent its subcooling power must be absolutely preserved in the storage bin by a proper cooling system keeping air temperature at a pre es
48. s are supplied from factory with the V belt placed on the smaller pulley for thicker ice scale production while drum r p m are the following MAR 55 0 9 MAR 75 1 1 MAR 105 1 5 MAR 125 2 4 MAR 205 1 05 and MAR 305 1 6 A C 1 8 W C observe that ice skin begin to form on the revolving drum surface and it is scraped by the blade Leftthe system operate for about 20 minutes Check for any excess noise beyond normal compressor noise Vibrating type from touching lines Compressor loose at one or more holddown bolts Drivemotor pulley misaligned with gear box pulley causing V belt vibration Check compressor oil levelthrough sight glass Except MAR 55 75 105 125 On water cooled machine check the water flowing out from condenser to see if it is correct Cooling water flow is controlled by a pressure water regulating valve No valve adjustment of water valve should be necessary unless the inlet temperature of cooling water is relatively high Normal head pressure should be 17 baron MAR 55 MAR 75 MAR 105 and MAR 125 16 bar on MAR 205 and 14 bar on MAR 305 Observe that evaporator drum is frosted all over from end to end If this is not the case setting of the refrigerant expansion valve may be necessary For proper adjustment of this valve turn the valve setting steam of one eight of a turn counterckwise to allow more refrigerant flow until the evaporator drum surface is evenly frosted from end
49. t the entire unit operation This control being automatic re set type will resume the unit operation after few seconds The unit will start and stop few more times due to the lo pressure control cut out and in until system refrigerant pressure set on their normal values Moat stops water Now when water level 6 After two or three minutes of operation reaches maximum level in water basin that is 115 120 mm for MAR 55 75 105 125 90 95 mm for MAR 205 305 Now water surrounds bottom half of freezing drum Move the manual ON OFF toggle of main disconnect switch to ON position and turn counterclockwise the timer knob to start the automatic ice maker operation The green light on console panel will glow Observe immediately that evaporator drum rotates in the right direction namely toward the scraping blade WARNING Correct Drum rotation The evaporator drum drive motor is a threephase motor wired for 400 V It is of extreme importance to check immediately upon unit start up that motor rotates CLOCKWISE in order that gear motor pulley rotates in the direction of the ARROW Should the motor turn counterclockwise it is necessary to instantly switch off the unit and interchange one polarity at terminal block connection of main electric cord NOTE A double Pulley is provided for two different RPM of revolving drum This pulley is fitted on output shaft of drive motor MAR air and water cooled version
50. tablished and constant value The ideal ice storage room is the type with mechanically refrigerated jacket space surrounding the ice bin Good practice calls for an ice storage capacity of about two times the daily ice machines production with an inside tempera ture of 6 C minimum 20 F UNPACKING AND INSPECTION Call your authorized SCOTSMAN Distributor od Dealer for proper installation Visually inspect the exterior of the shipping container and skid and any severe damage noted should be reported to the delivering carrier and a concealed damage claim filled subject to internal inspection with carrier representative present Removethe packing and remove the shipping bolts and the shipping base or skid When necessary install the leg levellers in the cabinet base sockets then raise the cabinet to the upright position Remove screws and shipping tapes and all doors and service panels from the cabinet and inspect for any concealed damage Notify carrier of any concealed damage claims as stated in step 2 above Remove all internal support packing tape and wires in machinery compartment Check that refrigerant lines do not rub or touch lines or surfaces and that fan blades if any moves freely Checkthatcompressoris snug on all mounting pads Use clean damp cloth or disposable paper wiper to wipe clean the exterior surface of the cabinet Page 11 10 See DATAPLATE on the cab
51. tion pressure Shuts off entire system in case of refrigerant failure in the system Factory setting cut out 0 2 bar Condenser Fan Motor Air Cooled Units The fan Motors used are permanent capacitor type fan motors Electrical supply to the fan motors is 230 V 50 Hz 0 7 Amp for MAR 55 75 105 125 10 and 305 0 9 Amp for MAR 205 Fan Motor Pressure Control MAR Air Cooled version are equipped with a pressure control which is a reverse acting automatic re set control directly connected to the fan motor Its function is to maintain the head pressure between the cut in and cut out setting values which are 15 17 bar Control Console Located on the front of the unit cabinet is a visual control console that monitors unit per formance automatically Any interruption or significant reduction in water or electrical supply causes an instant stop to the operation of the MAR flaker system Atthe same time a warning light is activated on the control console telling the user ofthe ice maker stoppage and also the reason why MAR 55 75 105 125 O APPARECCHIO IN FUNZIONAMENT UNIT ON MACHINE SOUS TENSION PRESSIONE MANDATA ECCESSIVA EXCESSIVE HI PRESSURE H PRESSION EXCESSIVE PRESSIONE ACGUA INSUFFICIENTE WATER PRESSURE TOO LOW PRESSION D EAU INSUFFISANT INTERVENTO TERMOSTATO MAGAZZINO ICE LEVEL CONTROL CUT OUT INTERVENTION THERMOSTAT CABINE INTERVENTO PROT TERMICO MOTORE RIDUTTOR
52. upt the water supply Page 20 SECTION III PRINCIPLES OF OPERATION HOW IT WORKS 1 ICE MAKER The revolving drum which may be of different size depending on the ice maker capacity is basically made of a cylinder skeleton covered by a stainless steel jacket A channel about 15 m m deep and 15 m m wide is machined in a spiral pattern that goes from one end to the other of the cylinder skeleton The end of the machined channel communicate with a bore made in the left cylinder journal The head manifold on the left side is for both liquid refrigerant inlet and vapor refrigerant outlet When cylinder metal jacket is forced and sealed onthe cylinder skeleton the spiral pattern channel made for the refrigerant flow becomes virtually the evaporator serpentine The metered refrigerant that reaches the evaporator serpentine by passing throught the bore in the left side cylinder journal boils and evaporatores as it comes in contact with the drum metal jacket About one third on the cylinder drum is constantly submerged in water This will allow the cylinder metal jacket to draw a film of water that as soon as it comes afloat freezes almostinstantly due to the heat absorption created by the boiling refrigerant circulating in the inner serpentine and scrubbing with the jacket inner surface The ice layer of the emerged cylinder sector has a fraction of time to solidify dry and eventually subcool before contacting the edge of t
53. ury or damage to equipment 10 11 12 13 CHANGING V BELT FROM SMALLER PULLEY GROOVE TO LARGER PULLEY GROOVE TO MAKE THIN ICE Remove top front right panel and right side panels Slid off V belt from motor pulley Unloose and remove hex head screw that secure step pulley on motor shaft Remove step pulley from motor shaft revolve it and re mount it on shaft with larger groove toward the exterior Tighten pulley on motor shaft by means of hex head screw previously removed Through the front by means of socket wrench slightly unloose two head hex screw securing the sleigh that supports the motor Through the right side slightly unloose the nut located in correspondence of the sleigh button hole The sleigh with the motor should be able to slide vertically Place V belt on groove of motor pulley and of gear box pulley Raise the sleigh with motor and pulley to give a rough tension to V Belt Tighten slightly the two hex head bolts and the nut previously unloosed Correct tension of V belt by moving upward or downward the Sleigh Drive Motor assembly When satisfied with V belt tension which should be snug but not tight proceed to definitively tighten the hex head bolts and nuts that secure motor support sleigh to side frame of drum basin 5 REMOVAL AND REPLACEMENT OF THE COMPRESSOR ASSEMBLY NOTE Always install a replacement Drier anytime the sealed Refrigeration System is opened
54. ve Water filter Water supply in Run separate water inlet for condenser Water drain line Open trapped or vented drain Page 16 UNIT INSTALLATION PRACTICE ON REFRIGERATED ICE STORAGE ROOM Jacket system CO MAR ICE MAKER Power supply line Hand disconnect switch Water supply line Hand shut off valve Water filter Water supply in Run separate water inlet for condenser Water drain line Open trapped or vented drain REFRIGERANT COIL Insulated panel Air gap Ice bulkhead Dd D an l a mE gt BI IH Page 17 MAR 305 REMOTE CONDENSER e E T Od Me E 187 1370 06 5 02 KA cod bun KIG 03 2 210 ke ver AL 1005 39 1 27 E s 1095 43 1 8 a Sis GAS AIR CGOLED Installation on roof or any location higher than the icemaker Service Schrader valves Page 18 SECTION II OPERATING INSTRUCTION COMPLETE UNIT START UP Remove all panels and open the water supply x Nr line shut off valve for both the evaporator drum and in the case of a water cooled machine to the condenser Observe the water filling operations Water flows into the float reservoir first Water is filling the freezing drum basin Float moves up as water level rises in water reservoir NOTE At first compressor start up the suction pressure declines rapidly to 0 2 bar causing the intervention of the pressure control which will interrup
55. y loose on motor shaft Water not entering reservoir Hi pressure control cut off unit operation CORRECTION Add refrigerant to raise suction pressure Raise head press control setting Check moisture indicator and remove charge and drier Replace amp recharge the system Check for refrigerant leak Check for water inlet through float ball or for water waste Water shut off valve closed Check and clean water strainer Remove Gear box and change fiber key Check Repair or replace Check and replace Repair Check and clean Water float valve to be cleaned Check cooling water at condenser Condenser tube clogged up Water regulating valve to be re adjusted Fan motor out of operations Page 32 SYMPTON POSSYBLE CAUSE CORRECTION Green Light is off Unit will not run Excessive noise Excessive vibration Compressor cycles Making wet ice Low ice production Blown fuse Loose electrical connection Switch in OFF position Inoperative master switch Spout switch cut out Contactor coil open winding Misaligned V belt Gear reducer loose on frame Drive motor end play or worm bearings Motor compressor not floating on rubber cushions Water level in evaporator drum basin too low Ice formation underneath blade frictioning against rotating drum Water regulating valve too close AEV valve closed Non condensable gases in sustem Surrounging air temperatur
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