Scotsman ND750 Service Manual Download Page 6

FOR THE INSTALLER: Final Check List

1. Is the icemaker-dispenser installed
indoors, in a location where the air and
water temperatures are controlled, and
where they do not go beyond design
limitations? 

2. is there an electrical service
disconnect within sight of the installed
machine? Is the machine on a separate
circuit? Has the voltage been 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 the left and right sides of an
air cooled machine?

6. Is there a minimum of 6 inches of
clearance at the top and back of the
machine for service and utility
connections?

7. Is there a water shut off valve
installed near the machine?

8. Have all of the shipping blocks been
removed?

ELECTRICAL?

LEVELED?

WATER INLET?

DRAINS?

ND750

January, 1989

Page 6

Summary of Contents for ND750

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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