Scotsman NM1852RH Manual
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Scotsman NM1852RH Manual

Scotsman NM1852RH Manual

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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 NM1852RH (remote high side) is the
freezer portion of a commercial ice machine. It
is designed to be connected to the
For the Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
Bin Controls and Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Circuit Board Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
condensing section of a refrigeration system,
specifically a supermarket R-22 system. It
consists of two evaporators, two gearmotors,
two liquid line valves, two control boxes, two
thermostatic expansion valves, and an EPR
valve.
August 1992
Page 1
NM1852RH

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Summary of Contents for Scotsman NM1852RH

  • Page 1: Table Of Contents

    EPR valve. The NM1852RH (remote high side) is the freezer portion of a commercial ice machine. It is designed to be connected to the For the Installer ........Page 2 For the Electrician .

  • Page 2: For The Installer

    NM1852RH FOR THE INSTALLER: Specifications The NM1852RH is designed to fit several Scotsman Ice Systems are designed and Scotsman storage bins. In some cases a bin manufactured with the highest regard for top kit will be required. safety and performance. They meet or exceed the standards of U.L., N.S.F., and...
  • Page 3 Remove the paper tape from the bin extension top edge, and using a mechanical lift, install the EXTENSION NM1852RH onto the top of the storage bin assembly. B90 STORAGE Fasten the ice machine to the bin using (4) 5/15-18 2.5" cap screws.

  • Page 4: For The Electrician

    NM1852RH FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Electrical Connections: DETAIL OF Locate the nameplate for the JUNCTION BOX current requirements, and then determine the wire size and type per the National Electric Code. The machine requires a solid chassis to earth ground wire.

  • Page 5: For The Plumber

    NM1852RH FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Supply: Drain System: The recommended water supply line is 3/8" All drains are of the gravity type, and must O.D. copper tubing, with a minimum operation have a minimum of 1/4" fall per foot of pressure of 20 PSIG, and a maximum of 120 horizontal run.

  • Page 6: Final Check List

    3. Has the water supply line be checked for pressures between 20 and 120? 10. Has the warranty registration card been properly filled out and mailed to Scotsman? 4. Has the unit been leveled? 11. Has the owner been given the service manual and been instructed on how to 5.

  • Page 7: Initial Start Up

    NM1852RH INITIAL START UP 1. Remove the top and front panels. 7. Switch on the other master switch, observe that: The liquid line valve opens 2. Open the water valve, and observe that the two float reservoirs fill up with water and shut The gearmotor runs off.

  • Page 8: Component Identification

    NM1852RH COMPONENT IDENTIFICATION Liquid line valve(s) The superheat setting is 4-8 F. Measure the temperature of the evaporator outlet at the These valves operate to turn the ice making TXV bulb, and check the low side pressure at process on and off.
  • Page 9 NM1852RH COMPONENT DESCRIPTION: Control Box Circuit Board: Controlling the ice machine through sensors and relays. The sensors are: ice level, and water level. The relays are for the gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the liquid line valve.
  • Page 10 NM1852RH COMPONENT DESCRIPTION: Evaporator Evaporator: A refrigerated vertical tube filled Divider: Where the ice is compressed and water and containing a water seal and auger. much of the extra water is squeezed out of it before it is discharged into the bin.

  • Page 11: Electrical Sequence

    NM1852RH ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Shut Down consists of: • • Each system is separate The liquid line relay opens. • • If the machine is switched off at the master The liquid line valve closes •...

  • Page 12: Operation

    NM1852RH OPERATION Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, goes 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 NM1852RH OPERATION: Refrigeration The remote high side evaporator, where it LIQUID supplies high pressure boils off (evaporates) LINE liquid R-22 to the and absorbs heat. It liquid line connection then moves through SIGHT GLASS on the ice machine. the ball valve and into...

  • Page 14: Maintenance And Cleaning

    NM1852RH 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 15 NM1852RH MAINTENANCE ////////////////////////////WARNING//////////////////////////// Disconnect electrical power before beginning. SLIDE ICE ///////////////////////////////////////////////////////////////////////// LEVEL 1. The bin control uses devices that sense CONTROLS OUT OF CHUTE light, therefore they must be kept clean enough so that they can "see". At least twice a...
  • Page 16 NM1852RH CLEANING Switch off electrical power, and shut off In some installations the water supply to the icemaker will be so concentrated with the water suplly. dissolved minerals, (such as calcium For more information on removal of these carbonate) that as ice is made, the parts, see REMOVAL AND REPLACEMENT.

  • Page 17: Service Diagnosis

    NM1852RH SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES 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 the spout switch. It opens from excess pressure of ice inside the ice chute: this should only happen when the machine does not shut off when the ice storage bin is full.
  • Page 18 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 Testor Model NM1 into the circiut board.
  • Page 19 NM1852RH STATUS: GEARMOTOR OPERATES, BUT NO ICE IS MADE A. Check the liquid line valve relay. The relay is on the circuit board, if it does not supply power to the liquid line valve, the valve will not open. 1. Check for power at the valve coil, if none: a.

  • Page 20: Removal And Replacement

    NM1852RH REMOVAL AND REPLACEMENT WATER RESERVOIR BIN CONTROLS (Ice Level Sensors) 1. Shut off the water supply to the icemaker. 1. Disconnect electrical power. 2. Remove front panel and reservoir cover. 2. Remove front panel. 3. To remove float only, pry the mounting 3.

  • Page 21: Bearing And Breaker

    4. Remove insulation halves from outside of materials are required to install properly. ice chute, loosen band clamp under ice chute, a. Add food grade grease such as Scotsman lift up and remove ice chute. part number 19-0569-01 to the seal area 5.

  • Page 22: Auger

    NM1852RH REMOVAL AND REPLACEMENT ///////////////////////////WARNING///////////////////////////// d. Lift up and remove breaker from evaporator. Disconnect electrical power. Handle the auger with care: it has sharp edges. e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded ////////////////////////////////////////////////////////////////////////// hole.

  • Page 23: Water Seal

    To Remove the Water Seal: 4. Place a small bead of food grade silastic (Assuming all steps to remove the auger have sealant (such as 732 RTV or Scotsman part been performed.) number 19-0529-01) on the area of the auger 1.

  • Page 24: Evaporator

    NM1852RH REMOVAL AND REPLACEMENT: Evaporator To Replace the Evaporator: To Reassemble the Evaporator and Auger (Assuming all the steps for removal of the 1. After the gearmotor has been inspected, thrust bearing, breaker, auger, and water seal fasten the evaporator to the gear motor, be have been performed.)

  • Page 25: Gearmotor

    NM1852RH REMOVAL AND REPLACEMENT: Gearmotor 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. 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate.

  • Page 26: Circuit Board Tester

    NM1852RH 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 27 OFF. If not replace the circuit board. board. If the light does go off, replace the 2. Plug “water sen” connector from Scotsman water level sensor. tester into circuit board. If the Bin Empty light is ON, wait 10-20 a.

This manual is also suitable for:

Nm1852rh-32a

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