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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 system.
FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 2
FOR THE INSTALLER: Environmental Limitations · · · · · · · · · · · · · · · · · · · · · · · · Page 3
FOR THE PLUMBER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 4
FOR THE ELECTRICIAN · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 5
FOR THE INSTALLER · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 6
START UP · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 7
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 8
COMPONENT DESCRIPTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 9
COMPONENT DESCRIPTION: Control Box · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 10
ELECTRICAL SEQUENCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 11
OPERATION: Water · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 12
OPERATION: Refrigeration · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 13
TECHNICAL CHARACTERISTICS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 14
MAINTENANCE AND CLEANING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 15
SENSOR MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 16
BEARING MAINTENANCE · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 17
MAINTENANCE AND CLEANING: Auger · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 18
SERVICE DIAGNOSIS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 19
SERVICE DIAGNOSIS:
CONTROL SYSTEM DIAGNOSTICS
REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls · · · · · · · · · · · · · · · Page 22
REMOVAL AND REPLACEMENT: Bearing And Breaker · · · · · · · · · · · · · · · · · · · · Page 23
REMOVAL AND REPLACEMENT: Auger · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 24
REMOVAL AND REPLACEMENT: Water Seal · · · · · · · · · · · · · · · · · · · · · · · · · · Page 25
REMOVAL AND REPLACEMENT: Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · Page 26
REMOVAL AND REPLACEMENT: Evaporator · · · · · · · · · · · · · · · · · · · · · · · · · · Page 27
REMOVAL AND REPLACEMENT: Gearmotor · · · · · · · · · · · · · · · · · · · · · · · · · · Page 28
REFRIGERATION SYSTEM SERVICE
This manual was printed on recycled paper.
Keep it for future reference.
Table of Contents
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 20
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 21
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · Page 29
January 2000
The NSE654 is a complete ice system that
produces and stores nugget ice.
It features: front service for the condenser, control
box, and water reservoir; an electronic circuit for
monitoring ice and water level; a thermostatic
expansion valve; and HP62 as the refrigerant.
Note these symbols when they appear.
They mark a section that concerns potential hazards.
Page 1
NSE654
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Related Manuals for Scotsman NSE654
Summary of Contents for Scotsman NSE654
- Page 1 REFRIGERATION SYSTEM SERVICE This manual was printed on recycled paper. Keep it for future reference. The NSE654 is a complete ice system that produces and stores nugget ice. It features: front service for the condenser, control box, and water reservoir; an electronic circuit for monitoring ice and water level;...
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Page 2: For The Installer
NSE654 FOR THE INSTALLER Installation Limitations: This ice system is designed to be installed indoors, in a controlled environment: Min. Air Temperature Water Temperature Water Pressure 20 PSI 80 PSI Voltage (Compared to the nameplate) Operating the machine outside of the limitations is misuse and can void the warranty. -
Page 3: For The Installer: Environmental Limitations
They meet or exceed the standards of UL, NSF, and CUL. 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 part and/or other components not specifically approved by Scotsman. -
Page 4: For The Plumber
NSE654 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: Connect a cold potable water supply to the 3/8" male flare fitting at the back of the cabinet. Install a hand valve near the machine to control the water supply. -
Page 5: For The Electrician
Voltage variation must remain within design limitations, even under starting conditions. All external wiring must conform to national, state, and local electrical codes. The use of a licensed electrician is required to perform the electrical installation. January 2000 Page 5 NSE654 POWER SUPPLY... - Page 6 NSE654 FOR THE INSTALLER 1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed the design limitations? 2. Is there an electrical service disconnect within sight of the installed machine? Has the voltage...
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Page 7: Start Up
9. Fill out the manufacturers registration card, and mail it to the Scotsman Factory. 10. Fill out the Customer Evaluation & Warranty Registration Form, and mail it to Scotsman. January 2000 Page 7 NSE654... -
Page 8: Component Description
COMPRESSOR 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. - Page 9 Thrust Bearing: As the ice is pushed up the evaporator, the auger is thrust down, and pressure from the auger thrust is taken up by this bearing. ICE SWEEP BREAKER January 2000 Page 9 NSE654 BEARING AUGER EVAPORATOR MOTOR...
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Page 10: Component Description: Control Box
LED1 Compressor Relay Low Pressure Cut Out Switch: An automatic reset control that shuts off the ice machine when the low side pressure drops below a preset point, 0-4 psig. Potential Relay: The compressor start relay. On/Off Switch: Manual control for the machine. -
Page 11: Electrical Sequence
The compressor will not restart until 2 minutes or more have passed after the last shut down. If the path between the ice level sensors remains clear for more than 10 seconds the ice machine will restart. Another purpose of the control board is to turn the machine off when necessary: ·... -
Page 12: Operation: Water
NSE654 OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, flows to the water reservoir which it enters through the float valve. The water then goes out the bottom of the reservoir tank to the bottom of the evaporator. -
Page 13: Operation: Refrigeration
(such as the water inside it). After the evaporator, the refrigerant, now a low pressure vapor, goes through the suction line back to compressor, where the cycle is repeated. SUCTION LINE DISCHARGE LINE THERMOSTATIC EXPANSION VALVE COMPRESSOR January 2000 Page 13 NSE654 EVAPORATOR GEAR MOTOR... -
Page 14: Technical Characteristics
NSE654 TECHNICAL CHARACTERISTICS Typical Low Side Pressure · 32 - 34 PSIG, less in cooler ambients, greater in hot ambients Typical Discharge Pressure · 200 - 250 PSIG air cooled · 245 PSIG water cooled Typical Gearmotor Amp Draw ·... -
Page 15: Maintenance And Cleaning
MAINTENANCE AND CLEANING A Scotsman Ice System represents a sizable investment of time and money in any company’s business. In order to receive the best return for that investment, it MUST receive periodic maintenance. It is the USER’S RESPONSIBILITY to see that the unit is properly maintained. It is always preferable, and less costly in the long run, to avoid possible down time by keeping it clean;... -
Page 16: Sensor Maintenance
CLEAN THE LIGHT SENSORS 2. The ice machine senses water level 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. -
Page 17: Bearing Maintenance
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 Breaker evenly and thoroughly. -
Page 18: Maintenance And Cleaning: Auger
NSE654 MAINTENANCE AND CLEANING: Auger Moving Parts Hazard. Moving fan blade can cause personal injury. Disconnect electrical power before beginning. 5. Clean the air cooled condenser: Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush. -
Page 19: Service Diagnosis
Low suction pressure due to low refrigerant charge January 2000 Page 19 NSE654 Probable Correction Restore Power Switch master switch to ON. Check water supply, filter, strainer, float valve. Correct water supply. Check/clean ice level sensors. - Page 20 Replace float valve or seat Recover and weigh refrigerant. Weigh in correct charge. Acid clean water cooled condenser. Clean out bin drain. Drains must be separate. Adjust or replace Clean with Scotsman Ice Machine Cleaner Oil or replace motor...
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Page 21: Control System Diagnostics
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. -
Page 22: Removal And Replacement: Water Reservoir & Bin Controls
NSE654 REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls WATER RESERVOIR FLOAT ASSEMBLY LOCKING TABS 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. Disconnect water inlet line from float valve. 4. To remove float only, push in the locking tab under the float valve, and pull float up and out of the reservoir. -
Page 23: Removal And Replacement: Bearing And Breaker
7. Reverse to reassemble: specific tools and materials are required to install properly. a. Add food grade grease such as Scotsman part number 19-0569-01 to the seal area before installing on the auger. b. Check the seal to shaft areas for cuts, or rough spots: none are permitted. -
Page 24: Removal And Replacement: Auger
Scrub the auger with ice machine cleaner and hot water. Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. 2. The water seal area. Because the auger has been removed, the water seal will have to be replaced. -
Page 25: Removal And Replacement: Water Seal
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 WATER SEAL 19-0529-01) on the area of the auger where the water seal is to be mounted. -
Page 26: Removal And Replacement: Evaporator
NSE654 REMOVAL AND REPLACEMENT: Evaporator To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Recover the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. - Page 27 NSE654 REMOVAL AND REPLACEMENT: Evaporator SEAL(S) O-RING EVAPORATOR BREAKER CAP SCREW ICE SWEEP WATER SEAL RETAININ G RING O-RING DRIP PAN WATER SHED LIP SEAL GASKET BREAKER COVER WATER SHED O-RING GEARMOTOR ASSEMBLY AUGER STUD BEARING AUGER January 2000 Page 27...
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Page 28: Removal And Replacement: Gearmotor
NSE654 REMOVAL AND REPLACEMENT: Gearmotor Electrical Shock Hazard. Electrical shock can cause personal injury. Disconnect electrical power before connecting tester. To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) 1. -
Page 29: Refrigeration System Service
Tank Must 11. Shut the low side access valve on the ice Be in Liquid machine. Dispensing 12. Remove hoses from ice machine and replace Position - all caps. Check Tank! SCALE January 2000...