Scotsman NM1250 Service Manual Download Page 2

Page: 2 / 31

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.

An optional stainless steel panel kit
(SPKCMD-1) may be added to the machine.
When installing a new system, check to be
sure that you have everything you need
before beginning:

Correct Bin
Correct Ice Machine
Correct Bin Top (if required)
All kits, legs, and information required for the

specific job.

SPECIFICATIONS: ICEMAKER

+ Minimum Circuit Ampacity is used to determine wire size and type per National Electric Code.

MODEL

NM1250AE-32A

NM1250WE-32A

NM1250AE-3A

NM1250WE-3A

DIMENSIONS

(without bin)

H" x W" x D"

27 x 30 x 24

same
same
same

90/70 ICE

CAPACITY

1000 lbs.

same
same
same

COMP.

H.P.

1.75

same
same
same

ICE

TYPE

NUGGET

same
same
same

BASIC

ELECTRICAL

208-230/60/1
208-230/60/1
208-230/60/3
208-230/60/3

MAX

FUSE

SIZE

20
20

n/a
n/a

MINIMUM

CIRCUIT

9.8
9.0

n/a
n/a

NM1250

February, 1989

Page 2

Summary of Contents for NM1250

Page 1: ...of kit KSTACK30 electronic circuitry for monitoring ice and water level a thermostatic expansion valve and R502 as the refrigerant TABLE OF CONTENTS For the Installer Specifications 2 Location 3 Stac...

Page 2: ...orrect Bin Correct Ice Machine Correct Bin Top if required All kits legs and information required for the specific job SPECIFICATIONS ICEMAKER Minimum Circuit Ampacity is used to determine wire size a...

Page 3: ...ne that filters out suspended solids to a dimension of 5 microns or smaller The finer the filter the better but finer filters will clog sooner than course ones It may be necessary to add a course filt...

Page 4: ...s in the bottom of the bin Turn the leg levelers all the way in preparation for leveling later Return the bin to the upright position remove paper covering the bin gasket Install bin top if required N...

Page 5: ...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 trans...

Page 6: ...back of the cabinet the drain line is of the gravity type and 1 4 inch per foot fall is an acceptable pitch for the drain tubing There should be a vent at the highest point of the drain line and the...

Page 7: ...es a solid chassis to earth ground wire The ice maker should be connected to its own electrical circuit so it would be individually fused Voltage variation must remain within design limitations even u...

Page 8: ...r leaks 4 Has the machine and bin been leveled 5 Is there a minimum of 6 clearance at the rear left and right of the machine for proper service access and air circulation 6 Is the water pressure a min...

Page 9: ...rain 5 The unit should soon be making ice if desired the low side pressure can be checked it should be 30 psig or 4 psig The suction line temperature at the compressor is normally very cold nearly to...

Page 10: ...Senses if there is water in the reservoir to make ice out of Will shut the machine off it there is none Ice Discharge Chute Directs the ice made by the evaporator into the storage bin Ice Level Senso...

Page 11: ...to the 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...

Page 12: ...faces meet Ice Sweep A plastic cap with fingers It revolves with the auger to sweep the ice into the ice chute Breaker Where the ice is compressed and much of the extra water is squeezed out of it be...

Page 13: ...e evaporator and then The auger motor relay opens and the auger motor stops If the ice level sensor is clear bin empty for more than 15 seconds the machine will start up again Another purpose of the c...

Page 14: ...of the evaporator Reservoir overflow or evaporator condensation is routed to the drain Water cooled models have a separate water circuit for the cooling water it enters the fitting at the rear goes t...

Page 15: ...depending upon the temperature of the evaporator warmer evaporators get more refrigerant and colder evaporators get less At the evaporator the refrigerant enters an area of relatively low pressure whe...

Page 16: ...and Hydroxyacetic acids These compounds are corrosive and may cause burns If swallowed DO NOT induce vomiting Give large amounts of water or milk Call Physician immediately In case of external contac...

Page 17: ...should also be checked at least two times per year Check the bearing by removing the ice chute cover unscrewing the ice sweep removing the water shed using a spanner wrench and unscrewing the breaker...

Page 18: ...top panel If top panel cannot be removed or if there is less than 6 clearance over the top of the machine the gearmotor evaporator may be slid out for service access See Removal And Replacement 2 Remo...

Page 19: ...ge E Check the high pressure cut out if closed go to F if open check 1 The pressure control opens at 450 psig Check the high side pressure reset the control and observe on water cooled that water soon...

Page 20: ...full light on the tester should be ON if not replace the circuit board If the bin full light on the tester is ON move the tester switch to bin empty the light on the tester should go OFF and the bin e...

Page 21: ...s open replace the contactor 3 Check the auger drive motor centrifugal switch If when the drive motor is running contact 4 black wire removed has no power and all of the above switches have been check...

Page 22: ...er leaks replace the water seal if found to be leaking 3 Check the low side pressure normal is about 30 psig If low assume a refrigerant leak locate repair and recharge If no leak the TXV may be restr...

Page 23: ...from icemaker 8 Reverse to reassemble BIN CONTROLS Ice Level Sensors 1 Disconnect electrical power 2 Remove front panel 3 Remove control box cover 4 Locate ice chute at the base of the chute in front...

Page 24: ...olding breaker to evaporator d Lift up and remove breaker bearing assembly from auger evaporator 6 Service the bearing Check for rust rough spots and damage a The bearing is pressed into the breaker t...

Page 25: ...en head cap screws holding breaker to evaporator d Lift up and remove breaker from evaporator e If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded hole The size...

Page 26: ...ast the grove for the snap ring 2 Replace the snap ring and pull the water seal down against it 3 The part of the water seal that rotates with the auger must also be replaced Remove the old part from...

Page 27: ...ntil dehydrated then weigh in the nameplate charge Check for leaks 8 Install auger breaker breaker bearing assembly and ice discharge chute in reverse order of disassembly See To Reassemble Evaporator...

Page 28: ...usty bearings and gears the oil having a creamy white appearance oil level too high carefully inspect the bearings and gears If in doubt about the condition of a part replace it The oil quantity is 14...

Page 29: ...ACEMENT Gearmotor WATER SHED SEAL CENTRIFUGAL SWITCH DRIVE MOTOR BEARING SEAL 1ST GEAR AND BEARINGS GASKET GEARCASE 2ND GEAR AND BEARINGS GEARCASE COVER BEARINGS OUTPUT GEAR OUTPUT SHAFT NM1250 Februa...

Page 30: ...at the ice level sensors are properly aligned clean and not obstructed use the tester as follows Bin Control Note All testing is done with the electrical power on the master switch on and all reset sw...

Page 31: ...t replace the circuit board b Move the water switch on the tester to the Water position The No Water light on the board should go OFF If not replace the circuit board If the light does go off replace...

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