Scotsman FME2404R Service Manual Download Page 25

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NME1854R & FME2404R

January 2000

Page 25

SERVICE DIAGNOSIS: Condition

Symptom

Possible Cause

Probable Correction

No ice is made, nothing operates

Unit off due to no power.

Restore power

Unit off due to master switch in Off

position

Move master switch to ON

Unit off due to low water level in

reservoir

Check water supply, filter and float

valve.

Unit off due to ice level sensors

(photo-electric eyes) blocked

Check/clean ice level sensors

Unit off due to scale on water level

sensor

Clean water level sensor

Unit off due to high pressure control

open

Check for remote condenser fan

motor failure or power interruption to

the fan motor

Auger motor hums but does not turn Auger can’t turn. Circuit board has not

yet shut unit down.

Unit is shut down

Circuit board has shut ice machine

down due to high auger motor amp

draw. Check for cause of high amp

draw, including bearings, gear motor

condition and scale on auger &

evaporator.

Pump down pressure control open,

very low suction pressure

Auger not turning due to: motor

failure; auger relay failure on circuit

board; or gears stripped. Check drive

train.
Liquid line valve not opening due to

coil failure or failure of compressor

relay on circuit board
TXV restricted or not metering. Check

bulb temperature.
Lack of refrigerant. Check for a leak.

No power to circuit board

Check harness
Hi or Low pressure switches open

Circuit board gear motor relay open

Check / replace board

Water level or ice level sensor failed Check / replace sensor

No ice, auger motor is turning

Compressor contactor coil is open

Check / replace contactor

Compressor will not start

Check start capacitor
Check start relay
Check compressor windings

Circuit board relay will not close

Check / replace board

Pump down pressure switch does not

close, liquid line valve open and

suction pressure high

Check pump down switch contacts

Summary of Contents for FME2404R

Page 1: ...NSTALLER Completed Installation Page 11 FOR THE INSTALLER Final Check List Page 12 START UP Page 13 COMPONENT DESCRIPTION Page 14 OPERATION Water Page 15 COMPONENT DESCRIPTION Control Box Page 16 ELECTRICAL SEQUENCE Page 17 SYSTEM INFORMATION Page 18 OPERATION Refrigeration Page 19 OPERATION Refrigeration Page 20 CLEANING and SANITATION Page 21 SENSOR MAINTENANCE Page 22 BEARING MAINTENANCE Page 2...

Page 2: ...21 3 1 3 1 4 5 9 43 17 8 18 8 There are two separate ice making and refrigeration systems in this model The liquid and discharge lines from each system must go to separate circuits in one remote condenser ERC302 TOP VIEW Allow 6 of space behind the machine for utility connections 34 84 13 84 18 28 SPECIFICATIONS Ice Machine Model Number Dimensions w o bin Basic Electrical Ice Type Cond Type Minimu...

Page 3: ...0 Precharged line set 40 R 404A 2 required Ice Machine NAMEPLATE LOCATED ON BACK PANEL SERIAL PLATE LOCATED BEHIND FRONT PANEL REMOTE CONDENSERS AND BINS ALSO HAVE MODEL AND SERIAL NUMBERS Model Use with Basic Electrical ERC302 32 1 FME2404R or NME1854R 208 230 60 1 19 7 8 23 13 16 ERC DIMENSIONS Model A B F G ERC302 43 3 8 10 3 4 21 3 4 16 5 8 ...

Page 4: ...red in any way including the use of any part and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any time Specifications and design are subject to change without notice Location Install the machine a location where it has enough space around it to be accessible for service usually a minimum of 6 inches Avoid hot di...

Page 5: ...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 Route a line set that rises then falls then rises Route a line set that falls then rises then falls Calculation Example 1 The condenser is to be located 5 feet below the ice machine and then 20 feet away horizontally 5 feet x 6 6 33 33 20...

Page 6: ...rader valve connection that end goes to the condenser Note The openings in the building ceiling or wall listed in the next step are the minimum sizes recommended for passing the refrigerant lines through 2 Have the roofing contractor cut a minimum hole for the refrigerant lines of 1 3 4 inch Check local codes a separate hole may be required for the electrical power to the condenser CAUTION DO NOT ...

Page 7: ...aged 4b Using two wrenches one to rotate the swivel nut and one to hold the tubing tighten each coupling It is CRITICAL that ONLY the NUT on the pre charged tube be turned or the diaphragms will be torn loose by the piercing knives and be loose in the refrigeration system causing severe operational problems Note As the coupling is tightened the diaphragms in the quick connect couplings will begin ...

Page 8: ...4R January 2000 Page 8 FOR THE INSTALLER Location REMOTE CONDENSER EXCESS PRECHARGED TUBING INSIDE BUILDING ICE MACHINE SERVICE ACCESS SERVICE ACCESS SIDE AND BACK ROOF CUTAWAY WALL CUTAWAY CONTACT ROOFING CONTRACTOR ...

Page 9: ...of the gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing Install a vent at the highest point of the drain line and the ideal drain receptacle would be a trapped and vented floor drain Use only 3 4 rigid tubing Storage Bin Install a separate gravity type drain Insulation of this drain line is recommended NME1854R FME2404R January 2000 Page 9 FLOOR DRAIN VENT BIN DR...

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

Page 11: ...R Completed Installation INSULATED PRECHARGED REFRIGERANT TUBING A typical installation should generally appear as illustrated below The remote condenser must be located above the Ice Machine and the precharged lines installed per the instructions on page 6 ...

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

Page 13: ...ceiver service valve 4 Switch each master switch on The electrical start up sequence is automatic There will be a short 15 second delay before the gear motor starts and the liquid line valve opens after that the low pressure control will close and the compressor will start 5 The remote condenser fan turns and the condenser begins to discharge warm air 6 The unit should soon be making ice if desire...

Page 14: ... Senses if there is water in the reservoir to make ice out of Will shut the machine off it there is none Ice Discharge Chute Directs the ice produced by the evaporator into the storage bin Ice Level Sensor An electronic eye it senses the presence of ice in the bottom of the ice discharge chute Operates to turn the ice machine on and off automatically as the level of ice in the bin changes Gear Mot...

Page 15: ...nters through the float valve The water them goes out the bottom of the reservoir tanks to the bottom of the evaporators Reservoir overflow or evaporator condensation is combined into a common drain line and routed to the drain NME1854R FME2404R January 2000 Page 15 EVAPORATOR DRAIN WATER LEVEL EVAPORATOR ICE CHUTE DRAIN WATER SCHEMATIC RESERVOIR WATER INLET ...

Page 16: ...d water level The relays are for the gear motor with a built in time delay to clear the evaporator of ice when the unit turns off and for the liquid line valve Potential Relay The compressor start relay On Off mode Switch Manual control for the machine NME1854R FME2404R January 2000 Page 16 Power Light Service Light Water OK Light Bin Full Light Freeze Light Compressor Relay Auger Relay Control Bo...

Page 17: ...loses stopping refrigerant flow The pump down control opens after the suction pressure falls to its cut out point The compressor contactor opens The compressor stops The auger motor stays on for 1 more minute clearing out ice in the evaporator and then The auger motor relay opens LED3 goes out and the auger motor stops The liquid line valve will not reopen until 2 minutes or more have passed after...

Page 18: ... Water Typical Suction Pressure 35 PSIG Typical Discharge Pressure 260 PSIG Minimum Discharge pressure low temps 180 PSIG Typical Compressor Amps Single Phase 4 3 Three Phase 2 8 Low Pressure pump down Control Cut in 30 Cut out 15 High Pressure Cut Out Automatic Reset Cut in 350 Cut out 450 ...

Page 19: ...rmer evaporators get more refrigerant and colder evaporators get less At the evaporator the refrigerant enters an area of relatively low pressure where it can easily boil off or evaporate As it evaporates it absorbs heat from the evaporator and whatever is in contact with it such as the water inside it After the evaporator the refrigerant now a low pressure vapor goes through the suction line back...

Page 20: ... to the receiver NME1854R FME2404R January 2000 Page 20 There are two separate refrigeration systems in this machine PUMP DOWN During the pump down cycle usually initiated by the circuit board de energizing the liquid line valve the discharge gases flow through their normal path to the remote condenser through the head pressure control and into the receiver At this point the refrigerant flow is st...

Page 21: ... switch the master switch to OFF 11 After draining the reservoir as in step 6 wash and rinse the water reservoir 12 Go thru steps 13 19 to sanitize the ice machine water system 13 Mix two gallons of sanitizer solution Use an approved sanitizer A possible sanitizer solution may be obtained by mixing two gallons of warm 90 115oF potable water with 1 ounce of household bleach 14 Slowly pout the sanit...

Page 22: ...vel by a probe located in the water reservoir At least twice a year the probe should be removed from the reservoir and the tip wiped clean of mineral build up SENSOR MAINTENANCE These units consist of two separate Ice Machines to properly clean and maintain the them these steps must be followed for both systems ICE DISCHARGE CHUTE SLIDE IN AND OUT ICE LEVEL SENSORS Clean the Probe s Tip with ice m...

Page 23: ...o check the action of the bearing It should rotate smoothly To remove the breaker take out all four allen head cap screws and pull the breaker off the auger and evaporator If the bearing only needs grease inject grease into the bearing using Scotsman grease needle pn 02 3559 01 and Scotsman bearing grease cartridge pn A36808 001 Be sure to inject grease evenly and thoroughly See Removal and Replac...

Page 24: ...nt For more information on removal and replacement of these parts see REMOVAL AND REPLACEMENT Shut off water and electrical supply 1 To remove the auger remove the front and top panels 2 Push back bail clamp holding ice chute cover to ice chute and remove cover 3 Unscrew and remove ice sweep 4 Remove ice chute from evaporator 5 Remove 4 allen screws holding breaker to evaporator 6 Pull up to remov...

Page 25: ...aw Check for cause of high amp draw including bearings gear motor condition and scale on auger evaporator Pump down pressure control open very low suction pressure Auger not turning due to motor failure auger relay failure on circuit board or gears stripped Check drive train Liquid line valve not opening due to coil failure or failure of compressor relay on circuit board TXV restricted or not mete...

Page 26: ...ed Clean out drain Tubing cracked Replace tubing Condensation on drain tubing Insulate tubing Hose off Re attach hose Reservoir cover off Return cover to reservoir Reservoir cracked Replace reservoir Evaporator water seal leaks Check base of evaporator drip pan If the seal leaks shut off the water remove the auger replace the water seal Check gear motor for water infiltration Excessive ice meltage...

Page 27: ...r contactor coil If it is on the ice sensors may be blocked Remove them and check for mineral scale Scotsman s test box can also be used to determine if the ice sensors or board are defective Using the tester A Disconnect the ice sensors at the connection by the ice chute Connect the LED and PHOTO TRANS wires to the control board s wires B With the On Off mode switch in either position move the Bi...

Page 28: ...ssemble BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the chute in front of and behind it are two plastic bin control mounts 5 Slide each bin control to the left and in the control box disconnect the electrical leads connecting the bin control to the circuit board 6 Reverse to reassemble be certain tha...

Page 29: ...ed into the breaker to remove the bearing and replace it an arbor press is needed b Replace lower seals before installing new bearing in breaker Note seals must be pressed in with a tool pushing against the outer edge only they will not install by hand Replace parts as required Re grease bearing with Scotsman part no A36808 001 bearing grease Replace top seal and check the o rings replace if cut o...

Page 30: ... on breaker to remove from auger If the auger is stuck Use a slide hammer type puller to pull on the auger at the threaded hole The size of that hole is 5 8 18 Inspect the auger the critical areas of the auger are a The auger body It should be clean and shining Sometimes an auger will appear clean when wet but after it is dry it will be seen to be stained Scrub the auger with ice machine cleaner a...

Page 31: ...er seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from the auger and clean the mounting area 4 Place a small bead of food grade silastic sealant such as 732 RTV or Scotsman part number 19 0529 01 on the area of the auger where the water seal is to be mounted 5 Carefully push the water seal rubber side against the auger should...

Page 32: ...discharge chute in reverse order of disassembly See To Reassemble Evaporator and Auger To Reassemble the Evaporator and Auger 1 After the gear motor has been inspected fasten the evaporator to the gear motor be sure that the number of shims indicated on the gear case cover is in place between the gearcase cover and the drip pan gasket Torque the bolts to 110 inch pounds 2 Lower the auger into the ...

Page 33: ... plate 3 Remove the gear motor from the Ice Machine To Inspect the gear motor A Remove the cap screws holding the gear motor case halves together and pry the two cases apart B To lift off the cover lift up until you can feel internal contact then pull the cover towards the output gear end and then lift the cover with drive motor attached up and away from the gear motor case Note The case cover out...

Page 34: ... 3 16 allen wrench to check that the valve is CLOSED The remove the core cap Close the valve and replace the caps when done The valve must be closed and the caps must be on or the valve will leak CHARGING PROCEDURES Extra care must be taken when recharging this remote system No liquid refrigerant maybe placed in the system at the compressor DO NOT use the valves at the front of the unit for weighi...

Page 35: ...ck the filters if there are any 2 Check the power supply to the machine Reset the breaker if it is tripped 3 If both water and power have been checked and are available try switching the power Off and then On After 2 minutes the machine should restart If this procedure restarts the machine service should be called the next time the machine stops NME1854R FME2404R January 2000 Page 35 ...

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