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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.
This machine is a combination nugget ice maker
and countertop dispenser, with the option of wall
mounting.
FOR THE INSTALLER: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FOR THE INSTALLER: Environmental Limitations . . . . . . . . . . . . . . . . . . . 3
FOR THE INSTALLER: Wall Mount Kit . . . . . . . . . . . . . . . . . . . . . . . . . 5
FOR THE INSTALLER: Soda Valve Kit . . . . . . . . . . . . . . . . . . . . . . . . . 6
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
COMPONENT DESCRIPTION: Control Box . . . . . . . . . . . . . . . . . . . . . . . 13
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION: Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
OPERATION: Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
OPERATION: Ice Vending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CLEANING and SANITIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . 21
SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing . . . . . . . . . . . . . 25
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
REFRIGERATION SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CIRCUIT BOARD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Parts Lists and Wiring Diagrams are printed on
yellow paper in the center of this manual.
This manual was printed on recycled paper.
Keep it for future reference.
Table of Contents
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
The 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 R-404A (HP62)
refrigerant. The ice dispensing section is a
seamless plastic storage bin, with a stainless steel
rotating vane to sweep the ice into the dispensing
chute.
. . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . 24
Note this symbol when it appears.
April 1997
Page 1
NDE550 & NDE650
It marks a possible hazard.
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Table of Contents
Related Manuals for Scotsman NDE550
Summary of Contents for Scotsman NDE550
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Page 1: Table Of Contents
......11 ....24 April 1997 Page 1 NDE550 & NDE650 Note this symbol when it appears. It marks a possible hazard. -
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 Installer
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 Scotsman part number 19-0529-01 is recommended. Place a bead of the sealant on the machine stand or counter top to match the outside edge of the cabinet base and sink. -
Page 5: For The Installer: Wall Mount Kit
12" 1" CLEARANCE X" 7.58" X = 30" for NDE550 X = 38.6" for NDE650 DO NOT LIFT ON SINK 2. Mount brackets "B" and "C" to the wall at the dimensions shown for the unit. (hardware for this is not included). -
Page 6: For The Installer: Soda Valve Kit
NDE550 & NDE650 FOR THE INSTALLER: Soda Valve Kit Installation Instructions Note: Carbonator and carbonated product cooling system are not included (for 115v models only). Electrical Shock Hazard. Disconnect electrical power to the icemaker - dispenser before beginning. 1. Remove cabinet top panel, front panel, and splash panel. -
Page 7: For The Plumber
Water Cooled Models: In addition to the above mentioned drain, a separate condenser drain must be installed. Connect it to the 1/2" condenser drain connection at the back of the cabinet. NDE550 & NDE650 WATER INLET CABINET DRAIN OPTIONAL... -
Page 8: For The Electrician
NDE550 & NDE650 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the ELECTRICAL rear of the machine. POWER Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity. -
Page 9: For The Installer: Final Check List
NDE550 & NDE650 FOR THE INSTALLER: Final Check List BACK VIEW OF COMPLETED INSTALLATION 1. Is the icemaker-dispenser installed indoors, in a location where the air and water temperatures are ELECTRICAL? controlled, and where they do not go beyond design limitations? 2. -
Page 10: Initial Start Up
9. Give the owner/user the service manual, instruct him/her in the operation and maintenance requirements of the unit. Make sure they know who to call for service. 10. Fill out the Customer Evaluation and Warranty Registration form, and mail it in to Scotsman. April 1997 Page 10... -
Page 11: Component Description
Note: Portion Control Optional after 4/97. Low Pressure Cut Out Switch: A manual reset control that shuts off the ice machine when the low side pressure drops below a preset point, 0-4 psig. ICE LEVEL SENSORS... - Page 12 NDE550 & NDE650 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled with water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator.
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Page 13: Component Description: Control Box
NDE550 & NDE650 COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor to the power supply. PORTION Circuit Board: Controlling CONTROL MODULE the ice machine through (Optional After 4/97) sensors and relays. The sensors are for ice level and water level. -
Page 14: Electrical Sequence
NDE550 & NDE650 ELECTRICAL SEQUENCE Refer the wiring diagram as needed. If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to on does the following: The bin empty light on the circuit board goes on... -
Page 15: Operation: Water
WATER RESERVOIR WATER INLET WATER DRAIN NDE550 & NDE650 Note: The correct water level is determined when the machine is operating. Check the water level and compare it to the line molded into the side of the reservoir. -
Page 16: Operation: Refrigeration
NDE550 & NDE650 OPERATION: Refrigeration Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. -
Page 17: Operation: Ice Vending
NDE550 & NDE650 OPERATION: Ice Vending When the ice dispensing glass filler lever is pushed, an electrical circuit is made to the portion control module in the control box. That module will energize the dispense drive motor for a certain length of time, depending upon the setting of the portion control knob. -
Page 18: Cleaning And Sanitizing
NDE550 & NDE650 CLEANING and SANITIZING 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 19: Maintenance And Cleaning
BIN CONTROL SENSOR 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 20 NDE550 & NDE650 MAINTENANCE AND CLEANING In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an evaporator and auger Moving Parts Hazard. Disconnect electrical power to the icemaker - dispenser before beginning.
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Page 21: Service Diagnosis: Condition - No Ice Being Produced
Check that the fan blades are clean, and the fan secure to the fan motor shaft. F. Check the water level in the reservoir. The machine will not run if there is not enough water in the reservoir. 1. Restore/adjust water level. See the next step. NDE550 & NDE650 April 1997 Page 21... - Page 22 If the bin empty light is still OFF, check the circuit board. 1. Unplug "opto trans" and "LED" connectors from the circuit board. 2. Plug "opto trans" and "LED" connectors from the Scotsman Electronic Control Tester Model NM1 into the circuit board.
- Page 23 B. Check the compressor 1. Check the compressor start relay. 2. Check the start capacitor. 3. Check the windings of the compressor for open windings or shorts to ground. Replace those items found defective. NDE550 & NDE650 April 1997 Page 23...
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Page 24: Service Diagnosis: Condition - Low Ice Production
NDE550 & NDE650 SERVICE DIAGNOSIS: Condition - Low Ice Production STATUS: EVERYTHING IS OPERATING A. Check the air cooled condenser for dirt. Clean as required. Check the head pressure on water cooled. Adjust as required. If the head pressure is very high: 1. -
Page 25: Service Diagnosis: Condition - Poor Or No Ice Dispensing
If it is not open, replace the portion control module in the control box. 2. Very short dispensing: Check for a shorted potentiometer (portion control). If shorted, replace it. If it is not shorted, replace the portion control module in the control box. NDE550 & NDE650 April 1997 Page 25... -
Page 26: Removal And Replacement
NDE550 & NDE650 REMOVAL AND REPLACEMENT WATER RESERVOIR 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. Disconnect inlet water line from valve. 4. To remove just the float, push the locking tab at the back of the valve mounting block in and lift the valve and block up and out of the reservoir tank. - Page 27 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 28 NDE550 & NDE650 REMOVAL AND REPLACEMENT To Remove the Auger: Turn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container. Moving Parts Hazard. Disconnect electrical...
- Page 29 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 mounted.
- Page 30 NDE550 & NDE650 REMOVAL AND REPLACEMENT To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Discharge the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet.
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Page 31: To Remove And Repair The Gearmotor Assembly
They are likely to be fine if the oil is. NDE550 & NDE650 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. -
Page 32: Refrigeration Service: Hp62
NDE550 & NDE650 REFRIGERATION SERVICE: R-404A (HP62) THIS ICE MACHINE USES HP62 REFRIGERANT AND POLYOLESTER COMPRESSOR OIL. DO NOT USE MINERAL OIL IN THIS REFRIGERATION SYSTEM. HP62 is a "Near Azeotrope", and therefore liquid charging is required. Weigh into the discharge side as much as possible of the charge as liquid refrigerant. -
Page 33: Refrigeration Service
Scotsman also recommends that, at the time of initial start up, gauges not be used. If gauges must be used, don’t always check the high side pressure. -
Page 34: Circuit Board Testing
NDE550 & NDE650 TESTING ELECTRONIC CIRCUIT INSTRUCTIONS FOR USING TESTER (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.) Electrical Shock Hazard. - Page 35 TESTING ELECTRONIC CIRCUIT Water Level 1. Unplug "water sen" connector from control board. 2. Plug "water sen" connector from Scotsman tester into circuit board. a. Move "water" switch on tester to No Water position. The No Water light on the circuit board should go ON.