NM650R 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. The NM650R is a remote condenser modular ice system that fits a variety of Scotsman storage bins.
NM650R FOR THE INSTALLER The NM650R is designed to fit the following Scotsman storage bins: • B590 and extentions, with bin top KBT18. • BH800 using bin top KBT15 (one unit). • BH800 if using two units, no bin top needed. • BH1000 using bin top KBT16. 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 • All kits, legs, and information required for the specific job.
NM650R FOR THE INSTALLER Installation Limitations: This ice system is designed to be installed indoors, in a controlled environment: Min Max 0 Air Temperature 50 F 1000F (Not including the remote condenser) Water Temperature 400F 1000F Water Pressure 20 PSIG 80 PSIG Voltage -5% +10% (Compared to the nameplate) Operating the machine outside of the limitations is misuse and can void the warranty. Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance.
NM650R REMOTE CONDENSER SPECIFICATIONS 1/2" MALE QUICK CONNECT COUPLING FOR USE WITH RT625 OR RT640 PRECHARGED LINE SET 22" 32.56" 5.38" 5.75" 19.86" 27.81" 3.5" 6.5" 7.5" 1.94" 5.0" LIQUID LINE 3/8" MALE QUICK CONNECT COUPLING FOR USE WITH RT625 OR RT640 PRECHARGED LINE SET MODEL RC1051-32 RC1052-32 RC551-1 DIMENSIONS H" X W" X D" USE WITH 27.8" X 22 X 37.94" 1 NM650R-32 SAME 1 or 2 NM650R’S (-32) SAME 1 NM650R-1 MINIMUM CIRC. AMPACITY+ BASIC ELECTRICAL 2 2 4.
NM650R 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. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the limitations described on page 3.
NM650R FOR THE INSTALLER: Remote Condenser Location Limited to a 40 foot or a 25 foot length of precharged refrigerant tubing connecting the icemaker to the remote condenser. The condenser must be above or level with the icemaker. Select the best available location, protecting the condenser from extremes of dirt, dust, and sun. Meet all applicable building codes. Usually the services of a licensed electrician are required. Roof Attachment 1.
NM650R 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 clean cloth to be certain that no foreign matter remains on them. 2.
NM650R FOR THE INSTALLER: Location TWO UNITS ON ONE CONDENSER REMOTE CONDENSER ROOF CUTAWAY EXCESS PRECHARGED TUBING INSIDE BUIDLING ICEMAKERS SERVICE ACCESS SIDE AND BACK WALL CUTAWAY December, 1988 Page 8 SERVICE ACCESS
NM650R FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet 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.
NM650R 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. The machine requires a solid chassis to earth ground wire. The ice maker should be connected to its own electrical circuit so it would be individually fused.
NM650R FOR THE ELECTRICIAN: Fan Relay Kit - 230 volt (-32) only ///////////////////////////WARNING///////////////////////////// Do all wiring with the electrical power disconnected. ///////////////////////////////////////////////////////////////////////// To install the KCMR230 fan relay kit when using (2) FM800R icemakers and one 230 volt, two circuit remote condenser.
NM650R FOR THE ELECTRICIAN: Fan Relay Kit Phasing (Do After Start Up) Only for 230 volt icemakers and 230 volt condenser. 6. Check phasing of the electrical circuit as Compare the readings obtained to the ones in follows: the following list: A. The phasing of the wiring MUST now be C. Test terminals 1-2 = Full Voltage (208-230) checked, as incorrect phasing will result in a Test terminals 1-3 = No voltage failure of the kit relay.
NM650R 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.
NM650R 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? 2. Is there an electrical service disconnect within sight of the installed machine? Has the voltage been checked, and compared to nameplate requirements? 3. Have all the plumbing connections been made and REMOTE CONDENSER checked for leaks? SECURED? 4. Has the machine and bin been leveled? 5.
NM650R START UP Pre-Start Inspection 1. Remove the front, left, and right side service panels. 4. Check that the refrigerant lines are properly installed. 2. Check that any styrofoam shipping blocks have been removed. 5. Check that the electrical power has been on for at least 12 hours and that the compressor dome is warm. 3. Inspect the interior of the machine for loose screws or wires. Check that no refrigerant lines are rubbing each other. Check that the fan blade turns freely (remote condenser). 6.
NM650R COMPONENT DESCRIPTION Control Box: Contains the electrical controls that operate the machine. High Pressure Cut Out: A manual reset switch sensing the high side refrigeration pressure. It is set to shut the machine off at 450 psig. Evaporator: A vertical stainless steel tube, refrigerated, and water filled. In it, there is a stainless steel auger. Reservoir: Float operated, it maintains the water level in the evaporator at a constant level, it also contains the water level sensor.
NM650R COMPONENT DESCRIPTION: Control Box Contactor: A definite purpose contactor connecting the compressor and the remote condenser fan motor to the power supply. 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. Also includes the reset switch.
NM650R ELECTRICAL SEQUENCE Refer the wiring diagram as needed. If the machine is switched off at the master switch, but is otherwise ready to go, switching the master switch to ON does the following: • The bin empty light on the circuit board goes on • There is a 15 second delay • If there is enough water in the reservoir, the circuit board will allow the machine to start up.
NM650R 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 them goes out the bottom of the reservoir tank to the bottom of the evaporator. Reservoir overflow or evaporator condensation is routed to the drain.
NM650R OPERATION: Refrigeration Beginning at the compressor, the refrigerant 502 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. This high pressure liquid then goes through the liquid line to the head pressure control valve, into the receiver, through the liquid line valve and then through the expansion valve.
NM650R OPERATION: Refrigeration Low Condensing Temperature The refrigeration system under low condenser air temperatures is much the same as it is under higher temperatures, with the exception that the resulting low head pressures cause the head pressure control to close off the liquid line between ththe condenser and the receiver.
NM650R OPERATION: Refrigeration PUMP DOWN 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. At this point the refrigerant flow is stopped by the closed liquid line valve. This action forces the refrigerant into the receiver and keeps it out of the compressor.
NM650R 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.
NM650R MAINTENANCE AND CLEANING /////////////////////////////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”. At least twice a year, remove the bin control sensors from the base of the ice chute, and wipe the inside clean, as illustrated. 2.
NM650R MAINTENANCE AND CLEANING In some areas the water supply to the icemaker will have a great deal of minerals in it, and that will result in ann evaporator and auger becoming coated with these minerals, requiring a more frequent removal than twice per year. If in doubt about the condition of the evaporator and auger, the auger can be removed so the parts can be inspected. ALLEN SCREWS BREAKER & BEARING & AUGER ASSEMBLY Note: Water filters can filter out suspended solids, but not dissolved solids.
NM650R 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 (circuit board and high pressure): depress and release each switch. If the unit still does not start, check the spout switch, or high side pressure. D. Check the high pressure cut out switch. 1. This pressure switch opens at 450 psig.
NM650R SERVICE DIAGNOSIS: Condition - No Ice Being Produced STATUS: NOTHING OPERATES G. Check: The gear motor, if it will not run, the compressor will not run. If no power to it: Check: the indicator lights on the circuit board, the bin empty light should be ON, the no water light should be OFF . 1. If the bin empty and no water lights are off, check the transformer. a. Transformer "load" side should have 12 to 15 volts. If not, check the "line" side. The line side should have between 208-230 volts.
NM650R 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 6-10 psig, and closes at 16-20 psig. If open check the low side pressure, if after running the machine the switch opens at a pressure higher than 10 psig, replace the switch.
NM650R 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. 2. The refrigerant may contain non condensable gases, purge, evacuate, and recharge per nameplate. 3. Check the interconnecting refrigerant tubing for kinks or twists.
NM650R 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. 4. To remove reservoir, disconnect water inlet compression fitting at reservoir inlet. 5. Remove drain hose from reservoir. 6. Remove evaporator inlet hose from reservoir. 7.
NM650R REMOVAL AND REPLACEMENT: Bearing And Breaker d. Lift up, and remove breaker/bearing Note: Removal of the auger, water seal, assembly from auger & evaporator. evaporator and gearmotor must begin at the top of the assembly. 6. Service the bearing. Check for rust, rough spots and damage. To Remove the Breaker Bearing Assembly: a.
NM650R REMOVAL AND REPLACEMENT: Auger To Remove the Auger: Turn off the water to the machine, and unclip the evaporator drain hose, pull it down and drain the evaporator into the bin or a container. 1. The top panel must be removed, or, if that is not possible, the gearmotor and freezer assembly must be pulled part of the way out from the cabinet. To do that: a. Unclip the electrical wires from the hanger near the drive motor. b. Remove the bolt holding the gearmotor plate. c. Pull the assembly out. 2.
NM650R REMOVAL AND REPLACEMENT: Water Seal To Remove the Water Seal: (Assuming all steps to remove the auger have been performed.) 1. The gearmotor/evaporator assembly will have to be pulled away from the machine (if not yet done). 2. Remove the 4 hex head cap screws holding the evaporator to the gearmotor assembly. Lift the evaporator up and off of the gearmotor. 3. Remove the snap ring or wire retainer from the grove under the water seal. 4. Pull or drive out the lower half of the water seal.
NM650R REMOVAL AND REPLACEMENT: Evaporator 1. Discharge the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. //////////////////////////////CAUTION/////////////////////////// Heat sink the TXV body when unsweating or resweating the adjacent tubing. ////////////////////////////////////////////////////////////////////////// b) At the suction line at the joint about 3" from the evaporator. 3. Remove the evaporator. 4.
NM650R REMOVAL AND REPLACEMENT: Gearmotor Assembly WATER SHED SEAL DRIVE MOTOR OUTPUT GEAR, OUTPUT SHAFT, AND BEARINGS BEARING SEAL GASKET ///////////////////////////WARNING///////////////////////// Disconnect Electrical Power Before Begining ///////////////////////////////////////////////////////////////////// GEARCASE December, 1988 Page 35
NM650R REMOVAL AND REPLACEMENT: Gearmotor Assembly 1. Remove the electrical wires from the gear drive motor. 2. Unscrew the 4 cap screws holding the gearmotor to the gearmotor plate. 3. Remove the gearmotor from the icemaker. To Inspect the gearmotor. A) Remove the cap screws holding the gearmotor case halves together and pry the two cases apart.
NM650R CIRCUIT BOARD TESTING INSTRUCTIONS FOR USING TESTER MODEL FC1 (Optional, order part no. A33942-001) (These instructions assume that the unit will not run, and prior investigation of electric power, controls, and mechanical parts indicates that the electronic circuit may be at fault.
NM650R 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. If not, 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 the water level sensor.
