Scotsman Ice NME454 manual

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. This is a modular ice system that fits a variety of Scotsman ice storage bins. Its features include: front servic[...]

FOR THE INSTALLER These machines fit the following Scotsman products, check sales literature for other possible combinations: · SB480 and extensions (with bin top KBT18) · B530 using bin top KBT14 or KBT20 · B842 using bin top KBT28 · B948 using bin top KBT24 NME654 Dispenser Applications The NME654 can be placed on and used with certain ice an[...]

NME454, 654 & FME504, 804 January 2007 Page 3 *Bin Top Kit Required SAMPLE BIN AND MACHINE COMBINATIONS FME804 ON BH550* NME654 ON BH801* The Nameplate is located on the back of the machine. A Serial Number Plate is located inside the cabinet, behind the front panel.[...]

FOR THE INSTALLER Location: Install the machine be installed in a location where it has enough space around it to be accessible for service. A minimum of 6" must be allowed at the back and sides for air circulation on air cooled models. Try to avoid hot, dirty and crowded locations. Be sure that the location for the machine is within the envir[...]

NME454, 654 & FME504, 804 March 2006 Page 5 FOR THE INSTALLER: Location TWO UNITS ON ONE BIN ALLOW ROOM FOR AIR CIRCULATION AND SERVICE ACCESS ALLOW AIR SPACE ON BOTH SIDES Airflow Notice: Airflow changed in 2006. Prior model's air flow was in the front and out the back. Current model's (shown) air flow is in the sides and out the bac[...]

FOR THE PLUMBER CONFORM TO ALL APPLICABLE CODES Water Inlet Air Cooled Models: Use 3 8 " O.D. copper tubing to connect cold potable water to the 3 8 " male flare fitting at the back of the cabinet. Install a hand valve near the machine to control the water supply. Water Treatment: In most areas, a water filter of some type will be useful.[...]

FOR THE ELECTRICIAN CONFORM TO ALL APPLICABLE CODES Connect the electrical power to the machine to the wires in 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 machine sh[...]

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.[...]

INITIAL START UP Pre-Start Inspection 1. Remove the front and side service panels. 2. Check that any shipping blocks have been removed. 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 (air cooled). 4. Check that the unit is installed corr[...]

COMPONENT DESCRIPTION Control Box: Contains the electrical controls that operate the machine. High Pressure Cut Out Switch : An automatic reset switch sensing the high side refrigeration pressure. It is set to shut the machine off if the discharge pressure should ever exceed 450 PSIG. Low Pressure Cut Out Switch An automatic reset control that shut[...]

COMPONENT DESCRIPTION Evaporator : A refrigerated vertical tube filled with water and containing a water seal and auger. Auger: A solid stainless steel double spiral auger, it pushes the ice crystals up to the top of the evaporator. Water Seal: A two part “face” seal, the top half rotating with the auger, the bottom half stationary, the sealing[...]

CONTROL BOX COMPONENTS Contactor: A definite purpose contactor connecting the compressor to the power supply. AutoSentry Ô Control Board The control board receives input signals from several sensors and translates them to control the electrical power supply to the various loads. The sensors include: · Electric eyes to check the ice level in the b[...]

ELECTRICAL SEQUENCE: There are 7 indicator lights on the control board: · WTR-OK (Water OK) . Green. Normal = Glowing. Glows when there is water in the reservoir. · PWR-OK (Power OK). Green. Normal = Glowing. Glows when the control board has power and is functional. · Service. Red. Normally Off. · Freeze. Red. Normally glowing when making ice. [...]

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. Reservoir overflow or evaporator condensation is routed to the drain. Water cooled model[...]

OPERATION: Refrigeration Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line directs this gas to the condenser. At the condenser (air or water cooled) the gas is cooled by either air or water and it then condenses into a liquid. This high pressure liquid then goes through the liquid line to the[...]

NME454, 654 & FME504, 804 January 2007 Page 16 OPERATION: Performance Typical Low Side Pressure · Air Cooled: 34 - 38 PSIG · Water Cooled: 32 PSIG Typical Discharge Pressure · Air Cooled: 220 - 300 PSIG · Water Cooled: 245 PSIG Typical Compressor Amp Draw · 8-9 Typical Auger Drive Motor Amp Draw (115 volt) · 3.1 to 3.5 - Emerson · 4t o4 [...]

CLEANING & SANITIZING 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 [...]

1. The bin control is a device that senses light, therefore it must be kept clean so it 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. The ice machine senses water level by a probe located in the water reservoir. At least twice a year, the probe sho[...]

NME454, 654 & FME504, 804 January 2007 Page 19 Clean the air cooled condenser. The air flow on this model is from front to back, so the inside of the machine will have to be available to clean the air cooled condenser. Use a vacuum cleaner or coil cleaner if needed. Do NOT use a wire brush. A. Disconnect electrical power, and remove the filter.[...]

The bearing in the breaker should also be checked at least two times per year . A. Check the bearing by: · removing the ice chute cover · unscrewing the ice sweep · removing the water shed & unscrewing the breaker cover (left hand threads). · unscrewing the auger stud Inspect the bearing. There should be plenty of grease in sight. If grease[...]

AUGER MAINTENANCE In some areas, the water supply to the ice maker will contain a high concentration of minerals, and that will result in an 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 par[...]

NME454, 654 & FME504, 804 January 2007 Page 22 SERVICE DIAGNOSIS Symptom Possible Cause Probable Correction No ice is made, nothing operates Unit off due to no power Restore Power Unit off due to master switch in OFF position. Switch master switch to ON. Unit off due to low water level. Check water supply, filter, strainer, float valve. Correct[...]

NME454, 654 & FME504, 804 January 2007 Page 23 SERVICE DIAGNOSIS Symptom Possible Cause Probable Correction Water Leak Drain plugged up Clean out drain Tubing cracked Replace tubing Condensation on drain tubing Insulate tubing Hose off Reattach hose Reservoir cover off Return cover to reservoir Reservoir cracked Replace reservoir Evaporator wat[...]

NME454, 654 & FME504, 804 January 2007 Page 24 CONTROL SYSTEM DIAGNOSTICS The control system consists of: · Control Board · Water Sensor · Ice Sensors · High Pressure Cut Out · Low Pressure Cut Out If the unit is OFF, check the control board: 1. Is the Power OK light on? If not check power to the unit. If it has power, and the Power OK lig[...]

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 of and behind it are two plastic bin control mounts. 5. Slide each bin control to the left, and in the control box, disconnect the electrical leads connecting the bin control to[...]

NME454, 654 & FME504, 804 January 2007 Page 26 REMOVAL AND REPLACEMENT: Bearing And Breaker Note: Removal of the auger, water seal, evaporator and gear reducer must begin at the top of the assembly. To Remove the Breaker Bearing Assembly: 1. Remove panels and disconnect electrical power. 2. Pull the bail clamp off of the chute cover. 3. Unscrew[...]

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. 2. Remove bail clip and remove ice chute cover. 3. Unscrew ice sweep. 4. Remove ice chute body. 5. The auger and breaker/bearing may now be removed as an a[...]

To Remove the Water Seal: (Assuming all steps to remove the auger have been performed.) 1. The gearmotor/evaporator assembly will have to be exposed. 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[...]

To Replace the Evaporator: (Assuming all the steps for removal of the thrust bearing, breaker, auger, and water seal have been performed.) 1. Recover the refrigerant from the ice maker. 2. Unsweat the refrigerant connections: a) At the thermostatic expansion valve outlet. Heat sink the TXV body when unsweating or resweating the adjacent tubing. b) [...]

To Check the Motor: 1. Remove wires from terminals 1 and 2. 2. Use an ohmmeter to check for continuity. If there is none, replace the motor only. If there is continuity, but the motor will not start, check the motor's start switch. 3. Remove motor end bell or motor stator. With ohmmeter wires attached to 1 and 2, move centrifugal switch actuat[...]

NME454, 654 & FME504, 804 January 2007 Page 31 REFRIGERATION SYSTEM SERVICE General: This ice machine uses R-404A refrigerant and polyolester oil. Do NOT use mineral oil in this refrigeration system. · When the system is serviced, a special liquid line drier is required. It is included with replacement compressors. · R-404A is not compatible [...]

NME454, 654 & FME504, 804 January 2007 Page 32 WHAT TO DO BEFORE CALLING FOR SERVICE If the machine is off, not making ice: 1. Check the water supply to the ice machine. The machine is designed to shut off if there is no water to it. Check the filters if there are any. 2. Check the power supply to the machine. Reset the breaker if it is tripped[...]