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
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Maintenance & Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Removal and Replacement
Water Reservoir & Bin Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Thrust Bearing & Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Circuit Board Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow
paper.
TABLE OF CONTENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
December 1992
The NM1852R 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-22 as the refrigerant.
Page 1
NM1852R
Advertisement
Table of Contents
Related Manuals for Scotsman NM1852R
Summary of Contents for Scotsman NM1852R
-
Page 1: Table Of Contents
Parts Lists and Wiring Diagrams are located in the center of this manual, printed on yellow paper. The NM1852R is a remote condenser modular ice system. It features: front service for the freezer, gearmotor, control box, water reservoir, and bin control;... -
Page 2: For The Installer
NM1852R FOR THE INSTALLER The NM1852R is designed to fit the following Scotsman storage bins: B90 and extentions, with bin top KBT18. BH800 no bin top needed. BH900 using bin top KBT14. When installing a new system, check to be sure that you have... - 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...
-
Page 4: Remote Condenser Specifications
LIQUID LINE 3/8" MALE QUICK CONNECT COUPLING FOR USE WITH RT2225 OR RT2240 PRECHARGED LINE SET USE WITH MINIMUM CIRC. AMPACITY+ 1 NM1852R ICEMAKER NAMEPLATE LOCATED ON BACK PANEL SERIAL PLATE LOCATED BEHIND FRONT PANEL December 1992 Page 4 32.56"... -
Page 5: Location
NM1852R 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: Remote Condenser
5. Have the roofing contractor seal the holes in the roof per local codes. Note: Tight spiral shown not required. Bend tubing as tight as is practical. Refrigerant charge is in the ice machine receiver. Only a holding charge is in the "pre-charged" lines. LOCATE REMOTE CONDENSER... - Page 7 6. After all connections are made, and after the king valve has been opened, check the couplings for leaks. NO SCHRADER VALVE TO ICEMAKER December 1992 Page 7 NM1852R SERVICE PORTS REMOTE CONDENSER 3/8" LIQUID LINE 1/2" DISCHARGE LINE 3/8" LIQUID LINE 1/2" DISCHARGE...
- Page 8 NM1852R FOR THE INSTALLER: Location REMOTE CONDENSER ROOF CUTAWAY CONTACT ROOFING CONTRACTOR EXCESS PRECHARGED TUBING INSIDE SERVICE BUILDING ACCESS ICEMAKER SERVICE ACCESS SIDE AND BACK WALL CUTAWAY December 1992 Page 8...
-
Page 9: For The Plumber
NM1852R FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet The recommended water supply is WATER INLET cold water. Use 3/8" O.D. copper 3/8" MALE FLARE 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 10: For The Electrician
NM1852R 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, and for the minimum circuit ampacity. - Page 11 NM1852R 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 December 1992...
-
Page 12: Final Check List
NM1852R 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 ROOF limitations? HOLES 2. Is there an electrical service... -
Page 13: 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. -
Page 14: Component Description
Water Level Sensor: Senses if there is water in the reservoir to make ice out of. Will shut the machine off it there is none. NOTE: THERE ARE TWO OF EACH OF THE LISTED COMPONENTS IN A NM1852R HEAD PRESSURE CONTROL VALVE COMPRESSOR HIGH PRESSURE... - Page 15 Pump Down Control: An automatic reset pressure switch connected to the low side of the refrigeration system. Controls the compressor. Potential Relay : The compressor start relay. On/Off Switch: Manual control for the machine. December 1992 Page 15 NM1852R CONTACTOR...
-
Page 16: Electrical Sequence
NM1852R ELECTRICAL SEQUENCE Refer the wiring diagram as needed. The two ice making systems operate independently except for the fan motor of the remote condenser. If either one of the systems is operating, the fan will be ON. If the machine is switched off at the master switch,... -
Page 17: Operation
NM1852R 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 NM1852R OPERATION: Refrigeration There are two separate refrigeration systems in this machine. Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the remote condenser the gas is cooled by air and it then condenses into a liquid.
- Page 19 220 psig). At that pressure the valve opens up the liquid line from the condenser to the receiver. Refrigeration Schematic DETAIL OF HEAD PRESSURE CONTROL LIQUID LINE VALVE KING VALVE SUCTION RECEIVER COMPRESSOR December 1992 Page 19 NM1852R REMOTE CONDENSER VALVE THERMOSTATIC EXPANSION VALVE EVAPORATOR LINE...
- Page 20 NM1852R OPERATION: Refrigeration There are two separate refrigeration systems in this machine. 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.
-
Page 21: Maintenance & Cleaning
MAINTENANCE AND CLEANING The NM1852R is made up of two separate ice makers; to properly clean and maintain the NM1852R, 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: Maintenance And Cleaning
NM1852R MAINTENANCE AND CLEANING The NM1852R is made up of two separate ice makers; to properly clean and maintain the NM1852R, these steps must be followed for both systems. WARNING Disconnect electrical power before beginning. 1. The bin control uses devices that sense light, therefore they must be kept clean enough so that they can "see". - Page 23 Clean the auger and evaporator as required. DO NOT HONE THE EVAPORATOR. 7. Replace the water seal. 8. Reverse to reassemble. December 1992 Page 23 NM1852R...
-
Page 24: Service Diagnosis
NM1852R 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 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 Tester Model NM1 into the circuit board .
- Page 26 NM1852R 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 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 TXV. HOWEVER, the condensing temperature will have a definite bearing on this. A unit with a marginal charge in summer, will be undercharged when the outside air temperature drops. The only correct way to charge this unit is to weigh in the nameplate charge. December 1992 Page 27 NM1852R...
-
Page 28: Removal And Replacement: Water Reservoir & Bin Controls
NM1852R 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: Thrust Bearing & 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 30: 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 reach of children. ////////////////////////////////////////////////////////////////////////// b. The water seal area. Because the auger has been removed, the water seal will have to be replaced. -
Page 31: Water Seal
4. Place a small bead of food grade silastic sealant RETAINING (such as 732 RTV or Scotsman part number RING 19-0529-01) on the area of the auger where the water seal is to be mounted. -
Page 32: Evaporator
NM1852R REMOVAL AND REPLACEMENT: Evaporator WARNING Disconnect electrical power, and shut off the water supply before beginning. To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Discharge the refrigerant from the ice maker. -
Page 33: Gearmotor
REMOVAL AND REPLACEMENT: Gearmotor Assembly WATER SHED OUTPUT GEAR, OUTPUT SHAFT, AND BEARINGS Note: There are two gearmotors in each NM1852R. To Remove and Repair the Gearmotor Assembly: (Assuming that the procedures through removal of the water seal have been performed.) WARNING... -
Page 34: Refrigeration
There are various mechanical devices that may be used to recycle refrigerant at the field level, however, Scotsman requires that any refrigerant placed into a Scotsman ice machine meet ARI spec 700-88. Reclaim programs are available through most refrigerant wholesalers. -
Page 35: Circuit Board Testing
The light on the tester should be ON. If the light on the tester is not on, the circuit board should be replaced. PHOTO TRANS LIGHT GOES ON SWITCH TO “BIN EMPTY” December 1992 Page 35 NM1852R LIGHT GOES ON LIGHT OFF... - Page 36 NM1852R CIRCUIT BOARD TESTING b. If the light on the tester IS on, move the “bin full” switch to Bin Empty. The light on the tester should go OFF, and the Bin Empty light on the circuit board should go ON.
- Page 37 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. If not, replace the circuit board.