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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 NM1250R is a remote condenser modular
ice system that produces up to 1400 lbs. of
nugget ice in 24 hours at 90
water.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Watert Seal
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
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F. air and 70
TABLE OF CONTENTS
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
November, 1988
It features: front service for the freezer,
gearmotor, control box, water reservoir, and
bin control; stackable with kit KSTACK30; an
electronic circuit for monitoring ice and water
level; a thermostatic expansion valve; and
R-502 as the refrigerant.
F.
Page 1
NM1250R
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Summary of Contents for Scotsman NM1250R
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Page 1: Table Of Contents
The NM1250R is a remote condenser modular ice system that produces up to 1400 lbs. of nugget ice in 24 hours at 90 water. -
Page 2: For The Installer
NM1250R FOR THE INSTALLER The NM1250R is designed to fit the following Scotsman storage bins: B590 and extensions (with bin top KBT18) HTB500 or BH500 BH800 using bin top KBT15 BH1000 using bin top KBT16 When installing a new system, check to be... - Page 3 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.
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Page 4: For The Installer: Remote Condenser
5" LIQUID LINE 3/8" MALE QUICK CONNECT COUPLING FOR USE WITH RT625 OR RT640 PRECHARGED LINE SET USE WITH BASIC ELECTRICAL 1 NM1250R 208-230/60/1 1 or 2 NM1250Rs ICEMAKER NAMEPLATE LOCATED ON BACK PANEL SERIAL PLATE LOCATED November, 1988 Page 4 32.56"... -
Page 5: Location
NM1250R FOR THE INSTALLER LEVEL THE ASSEMBLY 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 6: Remote Condenser
NM1250R FOR THE INSTALLER: Remote Condenser Installation Location: Limited to a 40 foot or a 25 foot length of precharged refrigerant tubing connecting the icemaker to the remote condenser. The condenser must be above or level with the highest (if stacked) icemaker. - Page 7 "discharge line". 9. After all connections are made, and after the king valve has been opened, check the couplings for leaks. NO SHRADER VALVE TO ICEMAKER November, 1988 Page 7 NM1250R SERVICE PORTS REMOTE CONDENSER 3/8" LIQUID LINE 1/2" DISCHARGE LINE...
- Page 8 NM1250R FOR THE INSTALLER: Stacking ////////////////////////////WARNING/////////////////////////// ELECTRICAL POWER MUST BE OFF WHEN CONNECTING WIRES ///////////////////////////////////////////////////////////////////////// 1. Install the lower unit onto the bin. 2. Remove the top panel from the lower unit. 3. With the aid of a mechanical hoist, lift the upper machine onto the top of the lower unit.
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Page 9: 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. November, 1988 Page 9 NM1250R ICEMAKER DRAIN 3/4" FPT BIN DRAIN 3/4" FPT... -
Page 10: For The Electrician
NM1250R 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 REMOTE CONDENSER... -
Page 11: Fan Relay Kit
FOR THE ELECTRICIAN To install the KCMR230 fan relay kit when using (2) NM1250R icemakers and one 230 volt, two circuit remote condenser. //////////////////////////////WARNING////////////////////////// Do all wiring with electrical power OFF. ////////////////////////////////////////////////////////////////////////// See the remote condenser nameplate for current requirements to determine wire size to be used for electrical hookup. - Page 12 NM1250R FOR THE ELECTRICIAN (Do this after Start Up) 6. Check phasing of the electrical circuit as follows: A. The phasing of the wiring MUST now be checked, as incorrect phasing will result in a failure of the kit relay.
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Page 13: 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. November, 1988 Page 13 NM1250R ROOF CUT-AWAY INSULATED PRECHARGED REFRIGERANT TUBING... -
Page 14: Final Check List
NM1250R 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 15: Start Up
10. Fill out the manufacturers registration card, and mail it to the Scotsman Factory. 11. Fill out the field quality audit form, and mail it to the Scotsman factory. November, 1988... -
Page 16: 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 17: Component Description: Control Box
(opening the microswitch at the top of the chute), or if either of the pressure cut out switches opens. November, 1988 Page 17 NM1250R PUMP DOWN CONTROL SWITCH OF/OFF SWITCH CONTACTOR... -
Page 18: Electrical Sequence
NM1250R 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... -
Page 19: Operation
NM1250R 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 20 NM1250R OPERATION: Beginning at the compressor, the refrigerant 502 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. This...
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Page 21: Operation: Refrigeration
At that pressure the valve opens up the liquid line from the condenser to the receiver. LIQUID LINE LIQUID LINE HIGH PRESSURE CONTROL SWITCH November, 1988 Page 21 NM1250R REMOTE CONDENSER DETAIL OF HEAD PRESSURE CONTROL VALVE THERMOSTATIC VALVE EXPANSION... - Page 22 NM1250R 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.
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Page 23: Maintenance & 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 24: Icemaker Maintenance
CAUTION: SENSOR TIP IS MADE OF GLASS /////////////////////////////////////////// 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 25: Maintenance: Auger
Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. 7. Replace the water seal. 8. Reverse to reassemble. BREAKER & BEARING & AUGER ///////////////////////////WARNING////////////////////////////// ASSEMBLY The auger has sharp edges, handle with gloves. ////////////////////////////////////////////////////////////////////////// November, 1988 Page 25 NM1250R... -
Page 26: Service Diagnosis
NM1250R 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 (circuit board 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 38).
- Page 28 NM1250R 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 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. November, 1988 Page 29 NM1250R...
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Page 30: Service Diagnosis: Condition - Low Ice Production
NM1250R 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 31: 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. November, 1988 Page 31 NM1250R FLOAT... -
Page 32: 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 33: Removal And Replacement: 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. //////////////////////////////////////////////////////////////////////////... -
Page 34: 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 35: Removal And Replacement: Evaporator
NOT use the schrader valves at the front of the unit for weighing in the charge. All liquid refrigerant must be weighed into the receiver through the "front seated" king valve. KING VALVE SERVICE PORT November, 1988 Page 35 NM1250R PLACE FOOD GRADE SILASTIC HERE CHARGING CYLINDER... -
Page 36: November
NM1250R 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 37 NM1250R REMOVAL AND REPLACEMENT: Gearmotor WATER SHED OUTPUT CENTRIFUGAL SWITCH SHAFT SEAL SHIMS DRIVE MOTOR GEARCASE COVER, OUTPUT SHAFT, OUTPUT GEAR, AND BEARINGS MOTOR BEARING SHAFT SEAL 1ST GEAR AND BEARINGS 2ND GEAR AND BEARINGS GASKET GEARCASE November, 1988 Page 37...
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Page 38: Electronic Control Tester
NM1250R ELECTRONIC CONTROL TESTER INSTRUCTIONS FOR USING TESTER MODEL FC1 (Optional, order part no. A33942-001) (These instructions assume that the unit will not run, and prior investigation of electric power, controls, and mechanical parts indicates that the electronic circuit may be at fault.) /////////////////////////////////////////////////////////////////////////////WARNING///////////////////////////////////////////////////////////// These procedures require the machine to be connected to the power supply. - Page 39 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.
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