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Scotsman ND750, Руководство по обслуживанию

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Circuit Board Testing

///////////////////////////////////////////////////////////////////////WARNING//////////////////////////////////////////////////////////////////

These procedures require the machine to be connected to the power supply.  The voltages of the
electronic circuit are very low, but HIGHER VOLTAGES ARE PRESENT IN THE UNIT.  Do not
touch anything but the tester while the unit is being checked out. Make all connections to the
circuit board with the ELECTRICAL POWER OFF.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

INSTRUCTIONS FOR USING TESTER,  model FC1 (Optional, order part no. A33942-001)

(These instructions assume that the unit will not run, and prior investigation of electric power,
controls, and mechanical parts indicates that the electronic circuit may be at fault.)

If the "Reset" indicator (located in the "reset" switch) is off and the "NO WATER" indicator is lit,
but inspection shows that the water level in the reservoir is above the top of the water level
sensor, OR the "BIN EMPTY" indicator is off while inspection shows that the ice level sensors are
properly aligned, clean and not obstructed, use the tester as follows:

Bin Control  

Note: All testing is done with the

electrical power on, the master switch on, and  all
reset switches “reset”.
1. Unplug “photo trans” and “LED” 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 Full.

The light on the tester should be ON.
If the light on the tester is not on, the circuit board
should be replaced.

b.  If the light on the tester IS on, move the “bin

full” 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 the Bin Empty light is ON, wait 10-20 seconds for
the machine to start, if the machine starts, replace
the ice level sensors.

If the Bin Empty light does not come ON, the
circuit board should be replaced.

LED

PHOTO

TRANS

SWITCH TO

“FULL”

LIGHT GOES

ON

LIGHT GOES ON

LIGHT OFF

SWITCH TO

“BIN EMPTY”

ND750

January, 1989

Page 29

Содержание ND750

Страница 1: ...ction is a seamless plastic storage bin with a stainless steel ice agitator at the bottom to sweep the ice into the dispensing chute TABLE OF CONTENTS For the Installer Specifications Page 2 Location...

Страница 2: ...Water Limitations An ice machine is a food manufacturing plant it takes in a raw material water and turns it into a food product ice The purity of the water is very important in obtaining pure ice and...

Страница 3: ...evelers so that the stand does not rock Counter Top or Machine Stand Installation The base of the icemaker dispenser must be sealed to the object it rests upon Food grade silastic sealant such as Scot...

Страница 4: ...valve to control it It is connected to a 3 8 FPT condenser inlet at the back of the cabinet The water pressure to all lines must always be above 20 psig and below 120 psig Drains Air Cooled Models Th...

Страница 5: ...machine requires a solid chassis to earth ground wire The ice maker should be connected to its own electrical circuit so it would be individually fused Voltage variation must remain within design lim...

Страница 6: ...checked and compared to nameplate requirements 3 Have all of the plumbing connections been made and checked for leaks 4 Has the machine been leveled 5 Is there a minimum of 6 inches of clearance at t...

Страница 7: ...e checked it should be 30 PSIG or 4 PSIG The air cooled discharge pressure will depend upon air and water temperatures but should be between 200 PSIG and 280 PSIG Water cooled discharge pressure shoul...

Страница 8: ...ce in the bin changes Drain Tube When uncapped and lowered drains the evaporator Condenser Air or water cooled where the heat removed in ice making is discharged Ice Storage Bin Assembly A plastic lin...

Страница 9: ...circuit board On Off Switch Manual control for the machine Transformer Supplies low voltage to the circuit board Potential Relay The compressor start relay Reset Switch Part of Circuit Board manual re...

Страница 10: ...ces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Breaker Where the ice is compressed and much of the extra water is squeezed out of it befor...

Страница 11: ...the machine When the water level in the reservoir falls below the water level sensor the machine will shut down When the water refills the reservoir the machine will start up again Separate from the...

Страница 12: ...ll 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 a...

Страница 13: ...g upon the temperature of the evaporator warmer evaporators get more refrigerant and colder evaporators get less At the evaporator the refrigerant enters an area of relatively low pressure where it ca...

Страница 14: ...the agitator drive motor for a certain length of time depending upon the setting of the portion control knob The dispensing takes place when the agitator sweeps the ice through the ice dispensing chu...

Страница 15: ...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 conta...

Страница 16: ...ontrol sensors from the grommets in the ice chute and wipe them clean 3 The bearing in the breaker should also be checked at least two times per year A Check the bearing by removing the ice chute cove...

Страница 17: ...of these parts see REMOVAL AND REPLACEMENT WARNING Disconnect electrical power and shut off the water supply Use care when removing the auger it has sharp edges 1 To remove the auger remove the front...

Страница 18: ...and weigh in the nameplate charge E Check the high pressure cut out if closed go to F if open 1 The pressure control opens at 450 psig Check the high side pressure reset the control and observe on wa...

Страница 19: ...ter to the full 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 t...

Страница 20: ...contactor 2 Check the contactor coil If the coil is open replace the contactor 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no...

Страница 21: ...ter leaks replace the water seal if found to be leaking 3 Check the low side pressure normal is about 30 psig If low assume a refrigerant leak locate repair and recharge If no leak the TXV may be rest...

Страница 22: ...tage and the agitator motor output shaft does not turn replace the agitator gear motor assembly C Check that the ice dispensing door opens when the glass filler lever is pushed If not check the vend s...

Страница 23: ...ve mounting 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...

Страница 24: ...head cap screws holding breaker to evaporator d Lift up and remove breaker bearing assembly from auger evaporator 6 Service the bearing Check for rust rough spots and damage a The bearing is pressed i...

Страница 25: ...eaker left hand threads b Unscrew auger stud from top of auger c Unscrew 4 allen head cap screws holding breaker to evaporator d Lift up remove breaker from evaporator e If the auger is stuck use a sl...

Страница 26: ...e 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 au...

Страница 27: ...l 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...

Страница 28: ...nd 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...

Страница 29: ...while inspection shows that the ice level sensors are properly aligned clean and not obstructed use the tester as follows Bin Control Note All testing is done with the electrical power on the master s...

Страница 30: ...oard should go ON If not replace the circuit board b Move the water switch on the tester to the Water position The No Water light on the board should go OFF If not replace the circuit board If the lig...

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