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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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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September, 1992
The NM1850R is a remote condenser modular
ice system. 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.
Page 1
NM1850R
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Summary of Contents for Scotsman NM1850R
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Page 1: Table Of Contents
NM1850R INTRODUCTION To the owner or user: The service manual The NM1850R is a remote condenser modular you are reading is intended to provide you, ice system. It features: front service for the and the maintenance or service technician, freezer, gearmotor, control box, water with the information needed to install, start up, reservoir, and bin control;... -
Page 2: For The Installer
NM1850R FOR THE INSTALLER TOP VIEW The NM1850R is designed to fit the following Scotsman storage bins: Allow 6" of space behind the machine • • for utility connections. B90 and extentions, with bin top KBT18. • • BH800 no bin top needed. - Page 3 Scotsman assumes no liability or responsibility (Not including the remote condenser) of any kind for products manufactured by Water Temperature Scotsman that have been altered in any way, Water Pressure 20 PSIG 80 PSIG including the use of any part and/or other...
- Page 4 H" X W" X D" AMPACITY+ ELECTRICAL RC1052 27.8" X 22 X 37.94" 1 NM1850R 208-230/60/1 +Included with the icemakers minimum circuit ampacity. Use this value to determine wire size between icemaker and fan motor. RT-625 Precharged line set, 25’, R-502 - 2 required.
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Page 5: Location
NM1850R 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 NM1850R 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 NM1850R 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 NM1850R FOR THE INSTALLER: Location REMOTE CONDENSER ROOF CUTAWAY CONTACT ROOFING CONTRACTOR EXCESS PRECHARGED TUBING INSIDE SERVICE BUIDLING ACCESS ICEMAKER SERVICE ACCESS SIDE AND BACK WALL CUTAWAY September, 1992 Page 8...
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Page 9: For The Plumber
NM1850R 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
NM1850R 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 NM1850R 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. INSULATED PRECHARGED REFRIGERANT TUBING September, 1992...
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Page 12: Final Check List
NM1850R 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 13: 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 14: Component Description
NM1850R 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 15 NM1850R COMPONENT DESCRIPTION: Control Box There are two control boxes in the machine. 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.
- Page 16 NM1850R ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Shut Down consists of: • • The liquid line solenoid closes, lowering the The two ice making systems operate independently except for the fan motor of the suction pressure. • •...
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Page 17: Operation
NM1850R OPERATION: Water Water enters the machine through the 3/8" male flare at the rear of the cabinet, divides into two inlet lines to each water reservoir which it enters through the float valve. The water them goes out the bottom of the reservoir tanks to the bottom of the evaporators. - Page 18 NM1850R OPERATION: Refrigeration There are two separate refrigeration systems in this machine. 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.
- Page 19 NM1850R OPERATION: Refrigeration There are two separate refrigeration systems in this machine. 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...
- Page 20 NM1850R OPERATION: Refrigeration PUMP DOWN There are two separate refrigeration systems in this machine. 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 21: Maintenance & Cleaning
NM1850R MAINTENANCE AND CLEANING The NM1850R is made up of two separate ice makers; to properly clean and maintain the NM1850R, these steps must be followed for both systems. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// A Scotsman Ice System represents a sizable investment of time and money in any company’s business. - Page 22 NM1850R MAINTENANCE AND CLEANING The NM1850R is made up of two separate ice makers; to properly clean and maintain the NM1850R, these steps must be followed for both systems. ICE CHUTE /////////////////////////////WARNING/////////////////////////// Disconnect electrical power before beginning. ////////////////////////////////////////////////////////////////////////// ICE LEVEL 1.
- Page 23 NM1850R MAINTENANCE AND CLEANING In some areas the water supply to the may not be the complete answer. Check with icemaker will have a great deal of minerals in a water treatment specialist regarding water it, and that will result in ann evaporator and...
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Page 24: Service Diagnosis
NM1850R 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, or on prior models, the circuit board; and high pressure): depress and release each switch. - Page 25 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 26 NM1850R SERVICE DIAGNOSIS: Condition - No Ice Being Produced (Work on each system separately) STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT A. Check the pump down control switch. 1. This pressure switch opens at 0-4 psig, and closes at 14-20 psig. If open check the low side pressure, if after running the machine the switch opens at a pressure higher than 5 psig, replace the switch.
- Page 27 NM1850R 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 28: Water Reservoir & Bin Controls
NM1850R 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 29: Auger
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 30 NM1850R 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. hole is 5/8"-18. Note that the auger has very sharp edges. Inspect the auger, the critical areas of the...
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Page 31: 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 32: Evaporator
NM1850R REMOVAL AND REPLACEMENT: Evaporator /////////////////////////////WARNING/////////////////////////// Head Pressure Control Valve Disconnect electrical power, and shut off 1. Purge system of refrigerant the water supply before begining. 2. Break off process tube on the top of the ////////////////////////////////////////////////////////////////////////// OLD head pressure control valve. - Page 33 NM1850R REMOVAL AND REPLACEMENT: Gearmotor Assembly WATER SHED SEAL DRIVE MOTOR OUTPUT GEAR, OUTPUT SHAFT, AND BEARINGS BEARING SEAL GASKET Note: There are two gearmotors in each NM1850R. /////////////////////////////WARNING///////////////////////////// Disconnect Electrical Power Before Begining /////////////////////////////////////////////////////////////////////////// GEARCASE September, 1992 Page 33...
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Page 34: Gearmotor
NM1850R REMOVAL AND REPLACEMENT: Gearmotor Assembly To Remove and Repair the Gearmotor white appearance; oil level too high) carefully Assembly: inspect the bearings and gears. If in doubt about the condition of a part, replace it. The oil (Assuming that the procedures through quantity is 16 fluid ounces, do not overfill. -
Page 35: Circuit Board Testing
NM1850R 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 36 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.