Scotsman Ice NME454, NME654, FME804, FME504 manual Control System Diagnostics

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NME454, 654 & FME504, 804

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 light is NOT on, check the high pressure and low pressure cut outs. If they are both closed, replace the board. If the Power OK light is ON, go to the next step.

2.Is the Water OK light on? If it is, go to the next step. If not, check the water level in the reservoir. If there is water in the reservoir, check that the water sensor is plugged in. To check the water sensor: A. Unplug water sensor.

B. Pull water sensor from reservoir.

C. Place one ohmmeter lead on the sensor's plug and the other on the sensor's tip. The meter should show nearly zero resistance. If it reads infinite resistance, check the tip for corrosion. If it is clean and still reads open, replace the sensor.

OR connect a copper wire to the wire where the water sensor plugs into and place the other end in the water. The water OK light should go ON. If it does not, replace the control board.

3.Ice sensor check. Is the Bin Full light Off? If it is OFF and the Service light is Off, and the unit is not running, replace the control board.

If it is OFF and the auger motor is running but the compressor is not, check the compressor contactor coil.

If it is on, the ice sensors may be blocked. Remove them and check for mineral scale. Scotsman's test

box can also be used to determine if the ice sensors or board are defective.

Using the tester:

A. Disconnect the ice sensors at the connection by the ice chute. Connect the LED and PHOTO TRANS wires to the control board's wires.

B. With the On - Off (mode) switch in either position, move the Bin Full switch on the tester to Bin Full - the tester's light will blink and after a few seconds the bin full light on the control board will come on. If not, replace the board.

Move the Bin switch on the tester to Bin Empty. The light on the tester will go out, and after a few seconds the Bin Full light on the board will go out. If master switch is ON, the unit should start.

4.High pressure cut out check. Disconnect electrical power.

Pull the wires off the high pressure cut out.

Use an ohmmeter to determine if the switch is OPEN, If it is, check the discharge pressure. If the discharge pressure is less than 300 PSIG, replace the high pressure cut out.

If the high pressure cut out is open and the system has high discharge pressure, check for the cause.

5.Low pressure cut out check. Disconnect electrical power.

Pull the wires off the low pressure cut out.

Use an ohmmeter to determine if the switch is OPEN, If it is, check the suction pressure. If the suction pressure is greater than 20 PSIG, replace the low pressure cut out.

If the low pressure cut out is open and the system has low suction pressure, check for the cause.

January 2007

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Contents NME454, 654 & FME504 IntroductionFor the Installer Installation LimitationsNME654 Dispenser Applications Fuse Charge Ampacity Size 404ASample BIN and Machine Combinations Location Water LimitationsFor the Installer Location Airflow NoticeFor the Plumber Use only ¾ rigid tubingFor the Electrician Final Check List There are no Adjustments to MAKE, so replace the panels Initial Start UPLow Pressure Cut Out Switch Component DescriptionNME454, 654 & FME504 On/Off mode Switch Manual control for Control BOX ComponentsAutoSentry Control Board Electrical Sequence Start UpShut Down Control Board Protection DevicesOperation Water Water Level The correct water level should beRefrigeration Schematic Operation RefrigerationOperation Performance Cleaning & Sanitizing ICE Making System In place cleaningSanitizing Sensor Maintenance AIR Cooled Maintenance Clean the air cooled condenserHazardous Moving Parts Bearing Maintenance OffAt least two times per year Auger Maintenance Service Diagnosis Symptom Possible Cause Probable CorrectionSymptom Possible Cause Probable Correction Control System Diagnostics Removal and Replacement Bin Controls BIN Controls Ice Level SensorsRemoval and Replacement Bearing And Breaker To Remove the Breaker Bearing AssemblyRemoval and Replacement Auger To Remove the AugerAuger is Stuck,Removal and Replacement Water Seal To Remove the Water SealTo Replace the Water Seal Removal and Replacement Evaporator Heat sink the TXV body when unsweating orResweating the adjacent tubing Removal and Replacement Gear Reducer and Motor Refrigeration System Service Access Valves To useInstructions for Liquid Charging R-404A What to do Before Calling for Service If the machine is off, not making ice
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FME504, FME804, NME654, NME454 specifications

Scotsman Ice Systems is known for its high-quality ice machines, and models such as the NME454, NME654, FME804, and FME504 are no exceptions. Designed with both performance and efficiency in mind, these machines cater to various business needs, from restaurants to convenience stores.

The NME454 and NME654 units are renowned for their compact design, making them ideal for establishments with limited space. Despite their smaller size, these machines do not compromise on ice production capacity. The NME454 can produce up to 430 pounds of ice per day, while the NME654 boasts an impressive output of up to 600 pounds. Both models utilize Scotsman's signature innovative technology to ensure consistent ice quality, primarily in the form of nugget ice, which is favored for its ability to cool beverages quickly.

In contrast, the FME804 and FME504 are larger-capacity machines that cater to high-volume requirements. The FME804 can produce around 800 pounds of ice daily, making it suitable for busy restaurants or bars. The FME504, while slightly smaller, still offers impressive production capabilities of up to 500 pounds per day. These machines incorporate advanced features such as the AquaArmor protective layer, which inhibits bacterial growth, ensuring that the ice produced is not only abundant but also hygienic.

All four models utilize an innovative air-cooled design that enhances energy efficiency and reduces operational costs. The easy-to-use control panel allows for straightforward operation, and maintenance is streamlined thanks to easily accessible components. Additionally, the quiet operation of the machines ensures that they can be used in front-of-house areas without distracting customers.

In terms of construction, Scotsman ice machines are built to last with corrosion-resistant materials, ensuring longevity in demanding environments. With simple installation processes and compatibility with various environments, including indoor and outdoor settings, these units provide adaptability for any business scenario.

Overall, Scotsman’s NME454, NME654, FME804, and FME504 ice machines combine robust performance with innovative technology, catering efficiently to diverse ice production needs while maintaining high standards of hygiene and reliability.
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