Table of Contents
Advertisement
Quick Links
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.
For the Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
For the Plumber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Final Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Initial Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Electrical Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Maintenance and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
Bin Controls and Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Bearing and Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
Gearmotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Circuit Board Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
Parts lists and wiring diagrams are in the center of this manual, printed on yellow paper.
TABLE OF CONTENTS
The NM1850RH (remote high side) is the
freezer portion of a commercial ice machine. It
is designed to be connected to the
condensing section of a refrigeration system,
specifically a supermarket R-502 system. It
consists of two evaporators, two gearmotors,
two liquid line valves, two control boxes, two
thermostatic expansion valves, and an EPR
valve.
May, 1989
Page 1
NM1850RH
Advertisement
Table of Contents
Related Manuals for Scotsman NM1850RH
Summary of Contents for Scotsman NM1850RH
-
Page 1: Table Of Contents
NM1850RH TO THE OWNER OR USER: The service manual you are reading is The NM1850RH (remote high side) is the intended to provide you, and the maintenance freezer portion of a commercial ice machine. It or service technician, with the information... -
Page 2: For The Installer
NM1850RH FOR THE INSTALLER: Specifications The NM1850RH is designed to fit the Scotsman Ice Systems are designed and Scotsman storage bin B590 and the BX560 manufactured with the highest regard for extension. Leg kit KLP4 is recommended safety and performance. They meet or when using both the bin and the extension. - Page 3 Remove the paper tape from the bin extension top edge, and using B560 BIN a mechanical lift, install the EXTENSION NM1850RH onto the top of the storage bin assembly. B590 STORAGE Fasten the ice machine to the bin using (4) 5/15-18 2.5" cap screws.
-
Page 4: For The Electrician
NM1850RH FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Electrical Connections: DETAIL OF Locate the nameplate for the JUNCTION BOX current requirements, and then determine the wire size and type per the National Electric Code. The machine requires a solid chassis to earth ground wire. -
Page 5: For The Plumber
NM1850RH FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Supply: Drain System: The recommended water supply line is 3/8" All drains are of the gravity type, and must O.D. copper tubing, with a minimum operation have a minimum of 1/4" fall per foot of pressure of 20 PSIG, and a maximum of 120 horizontal run. -
Page 6: Final Check List
9. Has the bin and cabinet been wiped clean or sanitized? 10. Has the warranty registration card been properly filled out and mailed to Scotsman? 11. Has the owner been given the service manual and been instructed on how to maintain the icemaker? 13. -
Page 7: Initial Start Up
NM1850RH INITIAL START UP 1. Remove the top and front panels. 7. Switch on the other master switch, observe that: The liquid line valve opens 2. Open the water valve, and observe that the two float reservoirs fill up with water and shut The gearmotor runs off. -
Page 8: Component Identification
NM1850RH COMPONENT IDENTIFICATION Liquid line valve(s) TXV bulb, and check the low side pressure at the EPR valve. Convert the pressure to These valves operate to turn the ice making temperature (using a temperature pressure process on and off. chart) and subtract the amount from the outlet When the ice level drops in the ice chute, the temperature. - Page 9 NM1850RH COMPONENT DESCRIPTION: Control Box Circuit Board: Controlling the ice machine through sensors and relays. The sensors are: ice level, and water level. The relays are for the gear motor (with a built in time delay to clear the evaporator of ice when the unit turns off) and for the liquid line valve.
- Page 10 NM1850RH COMPONENT DESCRIPTION: Evaporator Evaporator: A refrigerated vertical tube filled Divider: Where the ice is compressed and water and containing a water seal and auger. much of the extra water is squeezed out of it before it is discharged into the bin.
-
Page 11: Electrical Sequence
NM1850RH ELECTRICAL SEQUENCE Refer the wiring diagram as needed. Shut Down consists of: • • Each system is separate The liquid line relay opens. • • If the machine is switched off at the master The liquid line valve closes •... -
Page 12: Operation
NM1850RH 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 13 NM1850RH OPERATION: Refrigeration The remote high side evaporator, where it LIQUID supplies high pressure boils off (evaporates) LINE liquid R502 to the and absorbs heat. It liquid line connection then moves through SIGHT GLASS on the ice machine. the ball valve and into...
-
Page 14: Maintenance And Cleaning
NM1850RH 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 15 NM1850RH MAINTENANCE ////////////////////////////WARNING//////////////////////////// Disconnect electrical power before beginning. SLIDE ICE ///////////////////////////////////////////////////////////////////////// LEVEL 1. The bin control uses devices that sense CONTROLS OUT OF CHUTE light, therefore they must be kept clean enough so that they can "see". At least twice a...
- Page 16 NM1850RH CLEANING In some installations the water supply to the Switch off electrical power, and shut off the water suplly. icemaker will be so concentrated with dissolved minerals, (such as calcium For more information on removal of these carbonate) that as ice is made, the parts, see REMOVAL AND REPLACEMENT.
-
Page 17: Service Diagnosis
NM1850RH 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 reset switch, (on the circuit board): depress and release the switch. If the still does not start, check: the spout switch. - Page 18 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 19 NM1850RH STATUS: GEARMOTOR OPERATES, BUT NO ICE IS MADE A. Check the liquid line valve relay. The relay is on the circuit board, if it does not supply power to the liquid line valve, the valve will not open. 1. Check for power at the valve coil, if none: a.
-
Page 20: Removal And Replacement
NM1850RH REMOVAL AND REPLACEMENT WATER RESERVOIR BIN CONTROLS (Ice Level Sensors) 1. Shut off the water supply to the icemaker. 1. Disconnect electrical power. 2. Remove front panel and reservoir cover. 2. Remove front panel. 3. To remove float only, pry the mounting 3. -
Page 21: Bearing And Breaker
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 22: Auger
NM1850RH REMOVAL AND REPLACEMENT ///////////////////////////WARNING///////////////////////////// d. Lift up and remove breaker from evaporator. Disconnect electrical power. Handle the auger with care: it has sharp edges. e. If the auger is stuck use a slide hammer type puller to pull on the auger at the threaded ////////////////////////////////////////////////////////////////////////// hole. -
Page 23: Water Seal
To Remove the Water Seal: 4. Place a small bead of food grade silastic (Assuming all steps to remove the auger have sealant (such as 732 RTV or Scotsman part been performed.) number 19-0529-01) on the area of the auger 1. -
Page 24: Evaporator
NM1850RH REMOVAL AND REPLACEMENT: Evaporator To Replace the Evaporator: To Reassemble the Evaporator and Auger (Assuming all the steps for removal of the 1. After the gearmotor has been inspected, thrust bearing, breaker, auger, and water seal fasten the evaporator to the gear motor, be have been performed.) -
Page 25: Gearmotor
NM1850RH REMOVAL AND REPLACEMENT: Gearmotor To Remove and Repair the Gearmotor If there is evidence of water in the oil (rusty Assembly: bearings and gears; the oil having a creamy white appearance; oil level too high) carefully (Assuming that the procedures through inspect the bearings and gears. -
Page 26: Circuit Board Tester
NM1850RH 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 27 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.