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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.
Installation
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Fan Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
TABLE OF CONTENTS
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The NM650 is a modular ice system that fits a
variety of Scotsman ice storage bins.
It features: front service for the freezer,
gearmotor, control box, water reservoir, and
bin control; an electronic circuit for monitoring
ice and water level; a thermostatic expansion
valve; and R-502 as the refrigerant.
January, 1991
Page 1
NM650
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Summary of Contents for Scotsman NM650
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Page 1: Table Of Contents
Electronic Tester ......... 31 Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper. The NM650 is a modular ice system that fits a variety of Scotsman ice storage bins. -
Page 2: For The Installer
BACK VIEW: AIR COOLED WATER INLET 3/8" FLARE DRAIN 3/4" FPT The NM650 is designed to fit the following Scotsman storage bins: B590 and extensions (with bin top KBT18) BH800 using bin top KBT15 (one unit). BH800 (two units, no bin top required). - Page 3 UL, NSF, and CSA. 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.
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Page 4: Location
NM650 FOR THE INSTALLER Typical Storage Bin with Extension and Bin Top Location: After uncrating and inspection, the unit is ready for installation. It is important that the machine be installed in a location where it has enough space around it to be accessible for service, and minimum of 6"... -
Page 5: Two Units On One Bin
NM650 FOR THE INSTALLER: Location DO NOT STACK ANYTHING IN FRONT OF THE MACHINE(S) TWO UNITS ON ONE BIN ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS January, 1991 Page 5... -
Page 6: For The Plumber
NM650 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: The recommended water supply is clean, cold water. Use 3/8" O.D. copper tubing, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. -
Page 7: 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, 1991 Page 7 NM650 POWER SUPPLY... -
Page 8: Final Check List
NM650 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... -
Page 9: Start Up
9. Fill out the manufacturers registration card, and mail it to the Scotsman Factory. 10. Fill out the field quality audit form, and mail it to the Scotsman factory. January, 1991... -
Page 10: Component Description
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. Gear Motor: An oil filled, speed reduction gearbox, driving the auger. - Page 11 Transformer: Supplies low voltage to the circuit board. 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. Potential Relay: The compressor start relay.
- Page 12 NM650 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. Water Seal: A two part "face" seal, the top half...
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Page 13: Electrical Sequence
(early spout switch was a automatic reset). The master switch is the manual control for the complete machine, but it is not a service disconnect. January, 1991 Page 13 NM650... -
Page 14: Operation
NM650 OPERATION: Water RESERVOIR STRAINER DRAIN Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes to a strainer and then 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 15 After the evaporator, the refrigerant, now a low pressure vapor, goes through the suction line back to compressor, where the cycle is repeated. Refrigeration Schematic DISCHARGE LINE THERMOSTATIC EXPANSION VALVE COMPRESSOR January, 1991 Page 15 NM650 SUCTION LINE EVAPORATOR GEAR MOTOR...
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Page 16: Maintenance And Cleaning
NM650 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 17 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 buildup.
- Page 18 NM650 MAINTENANCE: Air Cooled ///////////////////////////WARNING///////////////////////////// Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// 5. Clean the air cooled condenser. The air flow on this model is from front to back, so the inside of the machine will have to be available to clean the air cooled condenser.
- Page 19 Beg. January 1991 ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY January, 1991 Page 19 NM650 Chute Cover After Jan. 1991 production, removal of the chute cover requires pulling the bail out of the notch in the chute cover. Also the breaker...
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Page 20: Service Diagnosis
NM650 SERVICE DIAGNOSIS: Condition - No Ice Being Produced A. Check: Voltage to the unit, restore it if there is none. Compare to the nameplate. B. Check: The master switch, switch ON if off. C. Check: Older models (late 1990 production and earlier) the 3 reset switches, (circuit board, high and low pressure): depress and release each switch. - Page 21 If the no water light is still on, check the circuit board: 1. Unplug the “water sen” connector from the circuit board. 2. Plug “water sen” connector from the Scotsman Electronic Control tester into the circuit board. a. Move the water switch on the tester to “no water” and the no water light on the circuit board should go on.
- Page 22 NM650 SERVICE DIAGNOSIS: Condition - No Ice Produced STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT A. Check the compressor relay. The relay is on the circuit board, if it does not supply power to the contactor coil, the compressor will not run.
- Page 23 The compressor should pull down to 25 inches of vacuum and hold there for three to five minutes. January, 1991 Page 23 NM650...
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Page 24: Removal And Replacement: Water Reservoir & Bin Controls
NM650 REMOVAL AND REPLACEMENT: Water Reservoir & Bin Controls WATER RESERVOIR 1. Shut off the water supply to the icemaker. 2. Remove front panel and reservoir cover. 3. To remove float only, pry the mounting flanges apart enough to lift one float pivot pin out of the flange hole, and pull float up and out of the reservoir. -
Page 25: 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 26: Auger
Scrub the auger with ice machine cleaner and hot water. ///////////////////////////WARNING////////////////////////////// Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. ////////////////////////////////////////////////////////////////////////// 2. -
Page 27: Water Seal
REPLACING THE WATER SEAL 4. Place a small bead of food grade silastic WATER SEAL sealant (such as 732 RTV or Scotsman part number 19-0529-01) on the area of the auger RETAINING where the water seal is to be mounted. -
Page 28: Evaporator
NM650 REMOVAL AND REPLACEMENT: Evaporator ///////////////////////////////////////////////////////////////////////////WARNING////////////////////////////// ////////////////////////////////// Disconnect electrical power before begining removal procedures. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 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. -
Page 29: Gearmotor
E) After the case is together, and the locating pins are secure in both ends, replace all cap screws. Bench test the gearmotor, check for oil leaks, noise, and amp draw. January, 1991 Page 29 NM650 CENTRIFUGAL SWITCH AUGER DRIVE MOTOR ROTOR BEARING SEAL... -
Page 30: Fan Motor Assembly
NM650 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. -
Page 31: Electronic Tester
CIRCUIT BOARD TESTING 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.