Table of Contents
Advertisement
Quick Links
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
informtion needed to install, start up, clean,
maintain, and service this ice system.
The NM1250 is a modular ice system that
produces up to 1000 lbs. of nugget ice in 24
0
hours at 90
F. air and 70
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Removal and Replacement
Water Reservoir & Bin Control . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Electronic Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
0
F. water.
TABLE OF CONTENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
It features: front service for the evaporator,
gearmotor, control box, water reservoir and
bincontrol; stackability by use of kit
KSTACK30; electronic circuitry for monitoring
ice and water level; a thermostatic expansion
valve; and R502 as the refrigerant.
February, 1989
Page 1
NM1250
Advertisement
Table of Contents
Related Manuals for Scotsman NM1250
Summary of Contents for Scotsman NM1250
-
Page 1: Table Of Contents
The NM1250 is a modular ice system that produces up to 1000 lbs. of nugget ice in 24 hours at 90 F. -
Page 2: Specifications
NM1250 FOR THE INSTALLER The NM1250 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 The normal finish for the machine is enamel-sandalwood. - Page 3 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, 80 psi including the use of any part and/or other components not specifically approved by +10% Scotsman.
-
Page 4: For The Installer
NM1250 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, and minimum of 6"... -
Page 5: Stacking
A. Plug the two pin plug onto the ice machine circuit board socket marked "LED" (CX2). B. Plug the 3 pin plug onto the ice machine circuit board socket marked "Photo Trans" (CX4). 12. Unplug the wire harness connecting the... -
Page 6: For The Plumber
NM1250 FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: The recommended water supply is cold water. Use 3/8" O.D. copper tubing, connect to the 3/8" male flare at the back of the cabinet. Install a hand valve near the machine to control the water supply. -
Page 7: For The Electrician
Voltage variation must remain within design limitations, even under starting conditions. All external wiring must conform to national, state, and local electrical codes. The use of a licensed electrician is required to perform the electrical installation. February, 1989 Page 7 NM1250 ICE MAKER JUNCTION BOX... -
Page 8: Final Check List
NM1250 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? LEVELED? 2. Is there an electrical service... -
Page 9: 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. February, 1989... -
Page 10: 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 11 TRANSFORMER CIRCUIT BOARD Low Pressure Control (Cut Out): A manual reset control to shut off the ice machine when the low side pressure drops below a preset point, 0-4 psig. Potential Relay: The compressor start relay. On/Off Switch: Manual control for the machine.
- Page 12 NM1250 COMPONENT DESCRIPTION Evaporator: A refrigerated vertical tube filled water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator. Water Seal: A two part "face" seal, the top...
-
Page 13: Electrical Sequence
It must be manually reset at the reset switch on the circuit board. The master switch is the manual control for the complete machine, but it is not a service disconnect. February, 1989 Page 13 NM1250... -
Page 14: Operation
NM1250 OPERATION RESERVOIR STRAINER DRAIN 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 15 REFRIGERATION SYSTEM SCHEMATIC DISCHARGE LINE COMPRESSOR LIQUID LINE February, 1989 Page 15 NM1250 SUCTION LINE THERMOSTATIC EXPANSION VALVE EVAPORATOR...
-
Page 16: Maintenance & Cleaning
NM1250 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 17 WATER RESERVOIR WATER LEVEL SENSOR 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 18 NM1250 MAINTENANCE: Auger ///////////////////////////WARNING//////////////////////////// Disconnect electrical power before begining. Handle auger with care, it has sharp edges. ///////////////////////////////////////////////////////////////////////// In some installations the water supply to the icemaker will be so concentrated with dissolved minerals, (such as calcium carbonate) that as ice is made, the...
-
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. February, 1989 Page 19 NM1250... - 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 Testor Model NM1 into the circiut 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. February, 1989 Page 21 NM1250...
- Page 22 NM1250 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 Control
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. February, 1989 Page 23 NM1250... -
Page 24: Thrust 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. -
Page 26: Water Seal
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 RETAINING where the water seal is to be mounted. RING 5. -
Page 27: Evaporator
2. Lower the auger into the evaporator barrel, slightly turning it to match up with the drive end. Do Not Drop Into the Evaporator. 3. Complete the reassembly by reversing the disassembly for the breaker & thrust bearing assembly. February, 1989 Page 27 NM1250... -
Page 28: Gearmotor
NM1250 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 29 NM1250 REMOVAL AND REPLACEMENT: Gearmotor WATER SHED CENTRIFUGAL SEAL SWITCH DRIVE MOTOR GEARCASE COVER, BEARINGS, OUTPUT GEAR, OUTPUT SHAFT BEARING 2ND GEAR AND BEARINGS SEAL 1ST GEAR AND BEARINGS GASKET GEARCASE February, 1989 Page 29...
-
Page 30: Electronic Tester
NM1250 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.