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COMPONENT DESCRIPTION: Control Box

Circuit Board:  Controlling the ice machine
through sensors and relays. The sensors are: ice
level, and 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.
Transformer:  Supplies low voltage to the circuit
board.
On/Off Switch:  Manual control for that side of the
machine.
Reset Switch:  Manual reset.  Glows when the
unit shuts off from the ice discharge chute being
overfilled (pressure of the ice opening the
microswitch at the top of the chute).
Not used on FM2400RH-32B.

ON/OFF SWITCH

TRANSFORMER

CIRCUIT

BOARD

TERMINAL STRIP

RESET SWITCH

(Early Models Only)

FM2400RH

August 1994

Page 9

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Содержание FM2400RH

Страница 1: ...motors two liquid line valves two control boxes two thermostatic expansion valves and an EPR valve For the Installer Page 2 For the Electrician Page 4 For the Plumber Page 5 Final Check List Page 6 Initial Start Up Page 7 Component Identification Page 8 Electrical Sequence Page 11 Operation Page 12 Maintenance and Cleaning Page 14 Service Diagnosis Page 17 Removal and Replacement Bin Controls and ...

Страница 2: ...est regard for safety and performance They meet or exceed the standards of U L N S F and C S A Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way including the use of any parts and or other components not specifically approved by Scotsman Scotsman reserves the right to make design changes and or improvements at any ti...

Страница 3: ...he storage bin assembly Fasten the ice machine to the bin using 4 5 15 18 2 5 cap screws Level the assembly by a Turning the leg levelers in or out on the standard legs b Use shims under the heavy duty legs of the KLP4 Locate the Nameplate The nameplate is located on the back panel of the machine and contains the electrical characteristics particular to the unit being installed Refrigeration Insta...

Страница 4: ...hould be connected to it s own electrical circuit and be individually fused Voltage when the unit is under full load must remain within the limitations listed on page 2 LOW VOLTAGE CAN CAUSE EQUIPMENT MALFUNCTION AND OR DAMAGE All external wiring should conform to the National State and local electrical codes Usually the services of a licensed electrician will be required DETAIL OF JUNCTION BOX JU...

Страница 5: ...tween the ice maker and the water supply Drain System All drains are of the gravity type and must have a minimum of 1 4 fall per foot of horizontal run The drains must be installed to conform to local plumbing codes The use of a vent at the machine and at the bin will allow the system to drain properly Use only rigid tubing for drains insulation of the bin drain is recommended SHUT OFF VALVE FIELD...

Страница 6: ...en removed from inside the cabinet 6 Have the electrical connections been made 7 Have the drains been installed and checked for leaks 8 Has the refrigeration supply been installed and checked for leaks 9 Has the bin and cabinet been wiped clean or sanitized 10 Has the warranty registration card been properly filled out and mailed to Scotsman 11 Has the owner been given the service manual and been ...

Страница 7: ...o make ice Water flows from the water reservoir and the float drops letting in more water 7 Switch on the other master switch observe that The liquid line valve opens The gearmotor runs Within a short time that side of the machine begins to make ice Water flows from the water reservoir and the float drops letting in more water 8 With both sides operating the sight glass should remain full and the ...

Страница 8: ...ng is 4 80 F Measure the temperature of the evaporator outlet at the TXV bulb and check the low side pressure at the EPR valve Convert the pressure to temperature using a temperature pressure chart and subtract the amount from the outlet temperature The result is the superheat Use an electronic thermometer EPR Evaporator Pressure Regulator Valve This valve maintains a constant pressure on it s inl...

Страница 9: ...s off and for the liquid line valve Transformer Supplies low voltage to the circuit board On Off Switch Manual control for that side of the machine Reset Switch Manual reset Glows when the unit shuts off from the ice discharge chute being overfilled pressure of the ice opening the microswitch at the top of the chute Not used on FM2400RH 32B ON OFF SWITCH TRANSFORMER CIRCUIT BOARD TERMINAL STRIP RE...

Страница 10: ...eing where the two seal faces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Divider Where the ice is compressed and much of the extra water is squeezed out of it before it is discharged into the bin Motor A permanent split capacitor motor that drives the gear reducer Bearing As the ice is pushed up the evaporator the auger is thrust down a...

Страница 11: ...rs for more than 15 seconds bin full At that point the bin empty light goes out and the machine shuts down Shut Down consists of The liquid line relay opens The liquid line valve closes Ice making stops The auger motor is run by the circuit board for 2 5 more minutes clearing out ice in the evaporator and then The auger motor relay opens and the auger motor stops If the ice level sensor is clear b...

Страница 12: ...o the bottom of the evaporator Reservoir overflow or evaporator condensation is routed to the drain Water cooled models have a separate water circuit for the cooling water it enters the fitting at the rear goes to the water regulating valve then to the water cooled condenser and then down the drain WATER INLET DRAIN DRIP PAN DRAIN EVAPORATOR WATER INLET RESERVOIR WATER LEVEL WATER SCHEMATIC FM2400...

Страница 13: ...thermostatic expansion valve meters the liquid refrigerant into the evaporator where it boils off evaporates and absorbs heat It then moves through the ball valve and into the evaporator pressure regulator valve or EPR The EPR keeps the evaporator pressure above a predetermined point even though the suction line pressure of the remote high side system may vary The refrigerant now a low pressure ga...

Страница 14: ...c and Hydroxyacetic acids These compounds are corrosive and may cause burns If swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physician immediately In case of external contact flush with water KEEP OUT OF THE REACH OF CHILDREN 7 Prepare the cleaning solution Mix eight ounces of Scotsman Ice Machine Cleaner with three quarts of hot water The water should be between 90 115...

Страница 15: ...of mineral buildup 3 The bearing in the breaker should also be checked at least two times per year Check the bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed using a spanner wrench and unscrewing the breaker cover unscrewing the auger stud Inspect the assembly looking for wear See Removal and Replacement to replace bearing or seals Reverse to reassemble 4 Ch...

Страница 16: ...removal of these parts see REMOVAL AND REPLACEMENT 1 To remove the auger remove front and top panel If top panel cannot be removed or if there is less than 6 clearance over the top of the machine the gearmotor evaporator may be slid out for service access See Removal And Replacement 2 Remove 3 hex studs holding ice chute cover to ice chute and remove cover 3 Unscrew and remove ice sweep 4 Loosen b...

Страница 17: ... the spout switch D Check the spout switch It opens from excess pressure of ice inside the ice chute this should only happen when the machine does not shut off when the ice storage bin is full This switch will reset when the ice melts but the machine will not resart until the reset switch on the circuit board is pressed E Check the water level in the reservoir The machine will not run if there is ...

Страница 18: ...ull position The bin full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin empty light on the circuit board should go ON If not replace the circuit board If it does as above and the machine still does not run replace the ice level sensors 3 If the transfo...

Страница 19: ...lve coil Check for an open wire between the relay and the valve 2 Check the valve coil If the coil is open replace the liquid line valve 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no power and all of the above switches have been checked replace the centrifugal switch or the drive motor 4 If the liquid line valve relay on the...

Страница 20: ...g screws from reservoir bracket and remove reservoir from icemaker 8 Reverse to reassemble BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the chute in front of and behind it are two plastic bin control mounts 5 Slide each bin control to the left and in the control box disconnect the electrical leads con...

Страница 21: ...Lift up and remove breaker bearing assembly from auger evaporator 6 Service the bearing Check for rust rough spots and damage a The bearing is pressed into the breaker to remove the bearing and replace it an arbor press is needed b Replace lower seals before installing new bearing in breaker Note seals must be pressed in with a tool pushing against the outer edge only they will not install by hand...

Страница 22: ...rews holding breaker to evaporator d Lift up and remove breaker from evaporator e If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole The size of that hole is 5 8 18 Inspect the auger the critical areas of the auger are 1 The auger body It should be clean and shining Sometimes an auger will appear clean when wet but after it is dry it will be seen to be s...

Страница 23: ...ly past the grove for the snap ring 2 Replace the snap ring and pull the water seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from the auger and clean the mounting area 4 Place a small bead of food grade silastic sealant such as 732 RTV or Scotsman part number 19 0529 01 on the area of the auger where the water seal is to be ...

Страница 24: ...l sweat in the new evaporator at the old connections 6 Install an new drier in the liquid line 7 Evacuate the system until dehydrated then weigh in the nameplate charge Check for leaks 8 Install auger breaker breaker bearing assembly and ice discharge chute in reverse order of disassembly See To Reassemble Evaporator and Auger To Reassemble the Evaporator and Auger 1 After the gearmotor has been i...

Страница 25: ...ickly check the gears and bearings They are likely to be fine if the oil is If there is evidence of water in the oil rusty bearings and gears the oil having a creamy white appearance oil level too high carefully inspect the bearings and gears If in doubt about the condition of a part replace it The oil quantity is 14 fluid ounces do not overfill Note The gears and bearings are available only as pr...

Страница 26: ...hat the ice level sensors are properly aligned clean and not obstructed use the tester as follows Bin Control Note All testing is done with the electrical power on the master switch on and all reset switches reset 1 Unplug photo trans and LED connectors from the circuit board 2 Plug photo trans and LED connectors from the tester into the circuit board a Move the bin full switch on the tester to Fu...

Страница 27: ...ot replace the circuit board b Move the water switch on the tester to the Water position The No Water light on the board should go OFF If not replace the circuit board If the light does go off replace the water level sensor If the Bin Empty light is ON wait 10 20 seconds for the machine to start The machine should start LIGHT ON WATER SENS SWITCH TO NO WATER SWITCH TO WATER LIGHT OFF CIRCUIT BOARD...

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