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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.
FOR THE INSTALLER: Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FOR THE PLUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FOR THE ELECTRICIAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
FOR THE INSTALLER: Completed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FOR THE INSTALLER: Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
START UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
COMPONENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ELECTRICAL SEQUENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE AND CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
ICEMAKER MAINTENANCE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SERVICE DIAGNOSIS: Condition - No Ice Being Produced . . . . . . . . . . . . . . . . . . . . . . . . 22
SERVICE DIAGNOSIS: Condition - Low Ice Production . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REMOVAL AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
REMOVAL AND REPLACEMENT: Bearing And Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 28
REMOVAL AND REPLACEMENT: Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
REMOVAL AND REPLACEMENT: Evaporator & Water Seal . . . . . . . . . . . . . . . . . . . . . . . 30
REFRIGERATION SERVICE: HP62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
ELECTRONIC CONTROL TESTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper.
This manual was printed on recycled paper.
Keep it for future reference.
The NME1250R is a remote condenser modular
ice system that 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 HP62 as the refrigerant.
Table of Contents
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August 1993
Page 1
NME1250R
Note this symbol when it appears.
It marks a possible hazard.
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Table of Contents
Related Manuals for Scotsman NME1250R
Summary of Contents for Scotsman NME1250R
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Page 1: Table Of Contents
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. This manual was printed on recycled paper. Keep it for future reference. The NME1250R is a remote condenser modular ice system that features: front service for the freezer, gearmotor, control box, water reservoir, and bin control;... -
Page 3: For The Installer: Remote Condenser
Max. and performance. 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 +10% 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
NME1250R FOR THE INSTALLER 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, usually a minimum of 6 inches. - Page 5 Note: spiral need not be as tight as illustrated. 5. Have the roofing contractor seal the holes in the roof per local codes. REMOTE CONDENSER LOCATE REMOTE CONDENSER ABOVE ICEMAKER August 1993 Page 5 NME1250R SPIRAL EXCESS TUBING INSIDE BUILDING...
- Page 6 NME1250R FOR THE INSTALLER 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 clean cloth to be certain that no foreign matter remains on them.
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Page 7: For The Plumber
Use only 3/4" rigid tubing. Storage Bin: A separate gravity type drain needs to be run. Insulation of this drain line is recommended. August 1993 Page 7 NME1250R ICEMAKER DRAIN 3/4" FPT BIN DRAIN 3/4" FPT... -
Page 8: For The Electrician
NME1250R 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, REMOTE CONDENSER and for the minimum circuit ampacity. -
Page 9: For The Installer: Completed Installation
NME1250R 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 TUBING... -
Page 10: For The Installer: Final Check List
NME1250R 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 the design limitations? 2. Is there an electrical service... -
Page 11: Start Up
9 Give the owner/user the service manual, instruct him/her in the operation of the unit, and make sure they know who to call for service. 10. Fill out the Customer Evaluation and Warranty Registration form, and mail it to Scotsman. April 1995 Page 11 NME1250R... -
Page 12: 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 13 30 PSIG, and opens at 15 PSIG. Potential Relay: The compressor start relay. On/Off Switch: Manual control for the machine. June 1995 Page 13 NME1250R PUMP DOWN CONTROL SWITCH OF/OFF SWITCH CONTACTOR...
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Page 14: Electrical Sequence
NME1250R ELECTRICAL SEQUENCE: A Model 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
The correct level should be between " below the line. If needed, bend the float arm up or down to adjust the water level. EVAPORATOR DRAIN DRAIN August 1993 Page 15 NME1250R " above and WATER LEVEL... - Page 16 NME1250R OPERATION: Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser and to the head pressure control At the remote condenser the gas is cooled by air and it then condenses into a liquid.
- Page 17 180 psig). At that pressure the valve opens up the liquid line from the condenser to the receiver. LIQUID LINE LIQUID LINE August 1993 Page 17 NME1250R REMOTE CONDENSER DETAIL OF HEAD PRESSURE CONTROL VALVE THERMOSTATIC VALVE...
- Page 18 NME1250R OPERATION: Refrigeration DISCHARGE LINE RECEIVER During the pump down cycle (usually initiated by the circuit board de-energizing the liquid line valve) the discharge gases flow through their normal path to the remote condenser, through the head pressure control, and into the receiver. At this point the refrigerant flow is stopped by the closed liquid line valve.
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Page 19: 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 20: Icemaker Maintenance
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 21 8. Reverse to reassemble. ALLEN Remote Condenser: SCREWS Clean the fins of the remote condenser. Use a soft brush or vacuum. Use coil cleaner if grease is embeded in the fins. BREAKER & BEARING & AUGER ASSEMBLY August 1993 Page 21 NME1250R...
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Page 22: Service Diagnosis: Condition - No Ice Being Produced
NME1250R 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: The reset switch ( high pressure): depress and release the switch. If the unit still does not start, check the high side pressure. - Page 23 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 (see page end of manual).
- Page 24 NME1250R 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 15 psig, and closes at 30 psig. If open check the low side pressure, if after running the machine the switch opens at a pressure higher than 18 psig, replace the switch.
- Page 25 D. Check the compressor 1. Check for power at the compressor: check the start relay, and start capacitor. 2. Check the windings of the compressor for open windings or shorts to ground. Replace those items found defective. August 1993 Page 25 NME1250R...
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Page 26: Service Diagnosis: Condition - Low Ice Production
NME1250R SERVICE DIAGNOSIS: Condition - Low Ice Production I. 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. -
Page 27: Removal And Replacement
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 cube chute. August 1993 Page 27 NME1250R FLOAT VALVE PLUNGER LOCKING TAB... -
Page 28: Removal And Replacement: 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 29: Removal And Replacement: Auger
Scrub the auger with ice machine cleaner and hot water. Ice machine cleaner is an acid. Handle it with extreme care, keep out of the reach of children. b. The water seal area. Because the auger has been removed, the water seal will have to be replaced. -
Page 30: Removal And Replacement: Evaporator & 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 31: Removal And Replacement: Evaporator
All liquid refrigerant must be weighed into the receiver through the "front seated" king valve. KING VALVE SERVICE PORT August 1993 Page 31 NME1250R CHARGING CYLINDER... -
Page 32: Removal And Replacement: Gearmotor
NME1250R REMOVAL AND REPLACEMENT: Gearmotor Electrical Shock Hazard. Electrical power can cause personal injury. Disconnect electrical power before beginning. 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 33: Refrigeration Service: Hp62
60 ..123 62 ..127 64 ..132 66 ..136 August 1993 Page 33 NME1250R VAPOR TEMP. PRESSURE (DEG F) (PSIG) 70 . - Page 34 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.
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Page 35: Electronic Control Tester
OFF, and the Bin Empty light on the circuit board should go ON. If the machine still does not run, replace the ice level sensors. PHOTO TRANS LIGHT GOES ON SWITCH TO "BIN EMPTY" August 1993 Page 35 NME1250R LIGHT GOES ON LIGHT GOES OFF... - Page 36 ELECTRONIC CONTROL TESTER 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.