Scotsman Ice FME804, NME454, NME654 Service Diagnosis, Symptom Possible Cause Probable Correction

Page 22

NME454, 654 & FME504, 804

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

Switch master switch to ON.

 

position.

 

 

 

 

 

Unit off due to low water level.

Check water supply, filter, strainer,

 

 

float valve. Correct water supply.

 

 

 

 

Unit off due to ice level sensors

Check/clean ice level sensors.

 

(photo-electric eyes) blocked.

 

 

 

 

 

Unit off due to scale on water level

Clean water level sensor.

 

sensor.

 

 

 

 

 

Unit off due to high pressure control

Check for water interruption (water

 

open.

cooled) or fan motor failure (air cool).

 

 

 

 

Auger motor hums but does not turn.

Auger can’t turn. Circuit board has not

 

 

yet shut unit down.

 

 

 

 

Unit is shut down

Circuit board has shut ice machine

 

 

down due to high auger motor amp

 

 

draw. Check for cause of high amp

 

 

draw, including bearings, gearmotor

 

 

condition and scale on auger and in

 

 

evaporator.

 

 

 

 

Low pressure control open

Auger not turning due to: motor

 

 

failure; auger relay failure on circuit

 

 

board; or gears stripped. Check drive

 

 

train.

 

 

 

 

 

TXV restricted or not metering. Check

 

 

bulb temperature.

 

 

 

 

 

Lack of refrigerant. Check for leak.

 

 

 

 

 

Check for a restricted system

 

 

 

 

No power to circuit board.

Check harness

 

 

 

 

 

Hi or low pressure cut outs open

 

 

 

 

Circuit Board gear motor relay will not

Check, replace board

 

close

 

 

 

 

 

Water level or ice level sensor failed.

Check, replace sensor

 

 

 

No ice, auger motor is turning

Compressor contactor coil is open

Check/replace contactor

 

 

 

 

Compressor will not start

Check start capacitor.

 

 

 

 

 

Check start relay

 

 

 

 

 

Check compressor windings

 

 

 

 

Circuit board compressor relay will

Check, replace board

 

not close.

 

 

 

 

Unit makes ice, but very slowly.

High discharge pressure because of a

Clean the air filter and condenser.

 

dirty condenser

 

 

 

 

 

Low capacity because the auger and

Clean the water system

 

evaporator are coated with mineral

 

 

scale

 

 

 

 

 

Low suction pressure due to low

Locate leak. Recover refrigerant,

 

refrigerant charge

repair leak, replace dryer, evacuate

 

 

and weigh in the nameplate charge

 

 

 

 

 

 

January 2007

Page 22

Image 22
Contents NME454, 654 & FME504 IntroductionNME654 Dispenser Applications For the InstallerInstallation Limitations 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 Control BOX Components On/Off mode Switch Manual control forAutoSentry Control Board Shut Down Electrical SequenceStart Up Control Board Protection DevicesOperation Water Water Level The correct water level should beRefrigeration Schematic Operation RefrigerationOperation Performance ICE Making System In place cleaning Cleaning & SanitizingSanitizing Sensor Maintenance Clean the air cooled condenser AIR Cooled MaintenanceHazardous Moving Parts Off Bearing MaintenanceAt 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 AssemblyAuger is Removal and Replacement AugerTo Remove the Auger Stuck,To Remove the Water Seal Removal and Replacement Water SealTo Replace the Water Seal Heat sink the TXV body when unsweating or Removal and Replacement EvaporatorResweating the adjacent tubing Removal and Replacement Gear Reducer and Motor Access Valves To use Refrigeration System ServiceInstructions for Liquid Charging R-404A What to do Before Calling for Service If the machine is off, not making ice
Related manuals
Manual 16 pages 49.74 Kb

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.