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INTRODUCTION

To the owner or user: The service manual you are
reading is intended to provide you, and the
maintenance or service technician with the
information needed to install, start up, clean,
maintain, and service this ice maker-dispenser.
The ND750 is a combination nugget ice maker and
countertop dispenser. A water station is standard.
The ND750 ice making section is equipped with
the following features: electronic controls for bin

level and low water; thermostatic expansion valve;
front service for most components; and R502
refrigerant. The ice dispensing section 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/Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

For the Electrician

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

Inital Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Operation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15

Service Diagnosis

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18

Removal and Replacement

Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23

Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24

Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25

Water Seal

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26

Evaporator

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27

Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28

Electronic Circuit Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

Wiring diagrams and parts lists are located in the middle of this manual, printed on yellow
paper

ND750

January, 1989

Page 1

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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