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Scotsman NM952 Service Manual

Scotsman nm952 ice machine: user guide
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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.
The NM952 is a modular ice system that fits a
variety of Scotsman ice storage bins.

TABLE OF CONTENTS

Installation
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
For the Electrician . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reservoir and Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fan Motor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
This manual was printed
on recycled paper.
. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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-22 as the
refrigerant.
August 1993
Page 1
NM952

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Summary of Contents for Scotsman NM952

  • Page 1: Table Of Contents

    The NM952 is a modular ice system that fits a variety of Scotsman ice storage bins. TABLE OF CONTENTS Installation For the Installer Specifications .

  • Page 2: For The Installer

    BACK VIEW: AIR COOLED WATER INLET 3/8" FLARE DRAIN 3/4" FPT The NM952 is designed to fit the following Scotsman storage bins: B90 and extensions (with bin top KBT18) BH800 using bin top KBT15 (one unit). BH800 (two units, no bin top required).

  • Page 3: Location

    They meet or exceed the standards of 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.

  • Page 4: Two Units On One Bin

    NM952 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 August 1993 Page 4...

  • Page 5: For The Plumber

    Storage Bin: A separate gravity type drain needs to be run, similar to the air cooled drain. Insulation of this drain line is recommended. FIELD SUPPLIED FILTER HAND VALVE VENTED DRAIN WATER INLET August 1993 Page 5 NM952 AIR COOLED MODELS VENTED DRAIN...

  • Page 6: For The Electrician

    NM952 FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied through the junction box at the rear of the machine. Check the nameplate (located on the back panel) for the voltage requirements, and for the minimum circuit ampacity.

  • Page 7: Final Check List

    7. Has the machine been secured to the bin? 8. Is there clearance over the top of the machine for service access? 9. Is there a water shut off valve installed near the machine? 10. Have all of the shipping blocks been removed? August 1993 Page 7 NM952...

  • Page 8: 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.

  • Page 9: 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.
  • Page 10 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 11 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/DIVIDER August 1993 Page 11 NM952 BEARING AUGER EVAPORATOR MOTOR...

  • Page 12: Electrical Sequence

    NM952 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 13: Operation

    SPOUT SWITCH EVAPORATOR DRAIN CHUTE WATER SCHEMATIC August 1993 Page 13 NM952 ADJUSTMENT OF WATER LEVEL WATER LEVEL EVAPORATOR...
  • Page 14 NM952 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 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 “see”. At least twice a year, remove the bin control sensors from the base of the ice chute, and wipe the inside clean, as illustrated. 2. The ice machine senses water level by a probe PULL UP TO REMOVE PROBE...
  • Page 17 Check with a flash light from the front to see if light can be seen though the condenser fins. Reverse to reassemble. 3. PULL FAN MOTOR ASSEMBLY UP AND OUT 4. CLEAN CONDENSER FINS. August 1993 Page 17 NM952...
  • Page 18 NM952 MAINTENANCE AND CLEANING: Auger 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 becoming coated with these minerals, requiring a more frequent removal than twice per year. If in...

  • Page 19: Service Diagnosis

    G. 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. August 1993 Page 19 NM952...
  • Page 20 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 21 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. August 1993 Page 21 NM952 contact,...
  • Page 22 NM952 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 23: Removal And Replacement: Water Reservoir & Bin Controls

    6. Reverse to reassemble, be certain that the bin controls are aligned so that the ice level sensors are visible (centered) through the holes in the ice chute. August 1993 Page 23 NM952 FLOAT ASSEMBLY...

  • Page 24: 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 25: 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. The water seal area. Because the auger has been removed, the water seal will have to be replaced.

  • Page 26: Water Seal

    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 27: Evaporator

    Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. ICE CHUTE BEARING BREAKER/DIVIDER August 1993 Page 27 NM952 ICE SWEEP AUGER EVAPORATOR...

  • Page 28: Fan Motor Assembly

    NM952 REMOVAL AND REPLACEMENT Electrical shock Electrical shock can cause personal injury. Disconnect power before beginning to service components. To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) 1. Remove the electrical wires from the gear drive motor.

  • Page 29: Refrigeration System

    There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700-88. Reclaim programs are available thru most refrigerant wholesalers.

  • Page 30: Electronic Tester

    NM952 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 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.

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