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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.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Removal and Replacement
Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Thrust Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
TABLE OF CONTENTS
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The NM950R is a remote condenser modular
ice system that fits a variety of Scotsman
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.
May, 1989
Page 1
NM950R
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Summary of Contents for Scotsman NM950R
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Page 1: Table Of Contents
NM950R INTRODUCTION To the owner or user: The service manual The NM950R is a remote condenser modular you are reading is intended to provide you, ice system that fits a variety of Scotsman and the maintenance or service technician, storage bins. It features: front service for the... -
Page 2: For The Installer
NM950R FOR THE INSTALLER The NM950R is designed to fit the following When installing a new system, check to be Scotsman storage bins: sure that you have everything you need • • before beginning: B590 and extentions, with bin top KBT18. - Page 3 Scotsman assumes no liability or responsibility Air Temperature of any kind for products manufactured by (Not including the remote condenser) Scotsman that have been altered in any way, Water Temperature including the use of any part and/or other Water Pressure...
- Page 4 27.8" X 22 X 37.94" 1 NM950R 208-230/60/1 RC1052-32 SAME 1 or 2 NM950R’S SAME +Included with the icemakers minimum circuit ampacity. RT-625 Precharged line set, 25’, R-502 Use this value to determine wire size between icemaker and RT-640. Precharged line set, 40’, R-502 fan motor.
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Page 5: Location
NM950R FOR THE INSTALLER Location Typical Storage Bin with Extension and Bin Top 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, usually a minimum of 6 inches. -
Page 6: Remote Condenser
NM950R FOR THE INSTALLER: Remote Condenser Location ////////////////////////////CAUTION///////////////////////////// Limited to a 40 foot or a 25 foot length of DO NOT KINK OR CRIMP REFRIGERANT precharged refrigerant tubing connecting the TUBING WHEN INSTALLING IT. icemaker to the remote condenser. The... - Page 7 NM950R FOR THE INSTALLER: Precharged Lines COUPLING INSTRUCTIONS /////////////////////////////CAUTION///////////////////////////// The couplings on the sets of precharged lines are self sealing when installed properly. Carefully follow the instructions: ////////////////////////////////////////////////////////////////////////// 1. Remove the protector caps and plugs. Wipe the seats and threaded surfaces with a...
- Page 8 NM950R FOR THE INSTALLER: Location TWO UNITS ON ONE CONDENSER REMOTE CONDENSER ROOF CUTAWAY EXCESS PRECHARGED SERVICE TUBING INSIDE ACCESS ICEMAKERS BUILDING SERVICE ACCESS SIDE AND BACK WALL CUTAWAY May, 1989 Page 8...
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Page 9: For The Plumber
NM950R FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet The recommended water supply is WATER INLET 3/8" MALE cold water. Use 3/8" O.D. copper FLARE tubing, connect to the 3/8" male flare at the back of the cabinet. -
Page 10: For The Electrician
NM950R FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES The electrical power to the unit is supplied Electrically the remote condenser fan motor is through the junction box at the rear of the connected to the icemaker at the contactor machine. - Page 11 3. Route connecting wires from the first ice To install the KCMR230 fan relay kit when maker junction box using (2) NM950R icemakers and one 230 volt, two circuit remote condenser. (marked condenser fan) and connect it to the KCMR230 terminal strip marked: NO. 1 ICE MACHINE.
- Page 12 NM950R FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up) 6. Check phasing of the electrical circuit as Compare the readings obtained to the ones in follows: the following list: A. The phasing of the wiring MUST now be C.
- Page 13 NM950R FOR THE INSTALLER: Completed Installation A typical installation should generally appear as illustrated below. The remote condenser must be located above the icemaker and the precharged lines installed per the instructions on page 6. ROOF CUT-AWAY INSULATED PRECHARGED REFRIGERANT...
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Page 14: Final Check List
NM950R FOR THE INSTALLER: Final Check List 1. Is the ice system installed indoors in a location where the air and water temperatures are controlled, and where they do not exceed ROOF HOLES the design limitations? SEALED? 2. Is there an electrical... -
Page 15: Start Up
5. The remote condenser fan turns, and the 10. Fill out the manufacturers registration condenser begins to discharge warm air. card, and mail it to the Scotsman Factory. 11. Fill out the field quality audit form, and mail it to the Scotsman factory. -
Page 16: Component Description
NM950R COMPONENT DESCRIPTION Control Box: Contains the electrical controls Ice Discharge Chute: Directs the ice that operate the machine. produced by the evaporator into the storage bin. High Pressure Cut Out: A manual reset switch sensing the high side refrigeration Ice Level Sensor: An electronic “eye”, it... - Page 17 NM950R COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor Pump Down Control: An automatic reset connecting the compressor and the remote pressure switch connected to the low side of condenser fan motor to the power supply. the refrigeration system. Controls the compressor.
- Page 18 NM950R ELECTRICAL SEQUENCE Refer the wiring diagram as needed. If the ice level sensor is clear (bin empty) for more than 15 seconds, the machine will start If the machine is switched off at the master up again. switch, but is otherwise ready to go, switching...
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Page 19: Operation
NM950R 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 them goes out the bottom of the reservoir tank to the bottom of the evaporator. - Page 20 NM950R OPERATION: Refrigeration Beginning at the compressor, the refrigerant depending upon the temperature of the 502 is compressed into a high temperature evaporator; warmer evaporators get more gas. The discharge line directs this gas to the refrigerant and colder evaporators get less. At condenser.
- Page 21 NM950R OPERATION: Refrigeration Low Condensing Temperature The refrigeration system under low condenser condenser (with a small amount of discharge air temperatures is much the same as it is gas going into the receiver to maintain under higher temperatures, with the exception...
- Page 22 NM950R OPERATION: Refrigeration PUMP DOWN During the pump down cycle (usually initiated is stopped by the closed liquid line valve. This by the circuit board de-energizing the liquid action forces the refrigerant into the receiver line valve) the discharge gases flow through and keeps it out of the compressor.
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Page 23: Maintenance & Cleaning
NM950R 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 24 NM950R MAINTENANCE AND CLEANING /////////////////////////////WARNING/////////////////////////// ICE CHUTE Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// 1. The bin control uses devices that sense ICE LEVEL light, therefore they must be kept clean SENSORS SLIDE LEFT TO enough so that they can “see”. At least twice a...
- Page 25 NM950R MAINTENANCE AND CLEANING /////////////////////////////WARNING////////////////////////////// Note: Water filters can filter out suspended Disconnect electrical power. solids, but not dissolved solids. “Soft” water may not be the complete answer. Check with Handle auger with care; it has sharp edges. a water treatment specialist regarding water...
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Page 26: Service Diagnosis
NM950R 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 2 reset switches (spout switch and high pressure): depress and release each switch. - Page 27 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 (see page 37).
- Page 28 NM950R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT A. Check the pump down control switch. 1. This pressure switch opens at 6-10 psig, and closes at 16-20 psig. If open check the low side pressure, if after running the machine the switch opens at a pressure higher than 10 psig, replace the switch.
- Page 29 NM950R SERVICE DIAGNOSIS: Condition - Low Ice Production STATUS: EVERYTHING IS OPERATING A. Check the condenser for dirt. Clean as required. Check the head pressure. If the head pressure is very high: 1. Check for high air temperatures, or restrictive air flow. Correct as needed.
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Page 30: Water Reservoir & Bin Controls
NM950R 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 31: Thrust Bearing & Breaker
5. The breaker may be removed from the a. Add food grade grease such as Scotsman auger and evaporator without disturbing the part number 19-0569-01 to the seal area auger. -
Page 32: Auger
NM950R REMOVAL AND REPLACEMENT: Auger ////////////////////////////WARNING//////////////////////////// Use a slide hammer type puller to pull on the auger at the threaded hole. The size of that Disconnect electrical power. Handle the hole is 5/8"-18. auger with care; it has sharp edges. -
Page 33: 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 34: Evaporator
NM950R 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. Discharge the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. - Page 35 NM950R REMOVAL AND REPLACEMENT: Gearmotor Assembly WATER SHED SEAL DRIVE MOTOR OUTPUT GEAR, OUTPUT SHAFT, AND BEARINGS BEARING SEAL GASKET ///////////////////////////WARNING///////////////////////// Disconnect Electrical Power Before Begining ///////////////////////////////////////////////////////////////////// GEARCASE May, 1989 Page 35...
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Page 36: Gearmotor
NM950R REMOVAL AND REPLACEMENT: Gearmotor Assembly To Remove and Repair the Gearmotor If there is evidence of water in the oil (rusty Assembly: bearings and gears; the oil having a creamy white appearance; oil level too high) carefully (Assuming that the procedures through inspect the bearings and gears. -
Page 37: Circuit Board Testing
NM950R 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 38 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.