Scotsman Ice FME504, NME454 Refrigeration System Service, Instructions for Liquid Charging R-404A

Page 31

NME454, 654 & FME504, 804

REFRIGERATION SYSTEM SERVICE

General: This ice machine uses R-404A refrigerant

Instructions for Liquid Charging R-404A

and polyolester oil. Do NOT use mineral oil in this

In preparation for charging, the low side hose

refrigeration system.

 

 

 

 

 

should have a sight glass, and/or a restricting

 

￿When the system is serviced, a special liquid

device (such as a “Charge Faster”) installed in it

 

line drier is required. It is included with

for metering liquid into the low side of the system.

 

 

 

replacement compressors.

 

 

 

 

 

1. After a thorough evacuation shut off the manifold

 

￿R-404A is not compatible with mineral oil so

valves and switch off the vacuum pump.

 

2. Place a drum of R-404A onto an electronic

 

these ice machines use Polyolester oil.

 

scale.

 

Polyolester oil absorbs water very easily. A

 

3. Attach the charging hose to the drum.

 

system opened for service must be re-sealed as

 

 

 

soon as possible (15 minutes maximum).

4. Open the valve on the drum and purge the

 

￿Special leak detection equipment is required to

charging hose.

 

5. Zero out the scale.

 

locate small refrigerant leaks. Usually a leak

 

6. Shut the low side access valve at the ice

 

detector capable of detecting a Halongenated

 

machine.

 

refrigerant or HFC-134a will work. Check with

 

7. Open the discharge manifold valve full open.

 

the leak detector manufacturer if in doubt.

 

 

 

￿Evacuate to 300 microns.

 

 

 

 

 

8. Watch the scale, when the correct charge is

 

 

 

 

 

 

shown, shut the manifold valve.

 

￿Liquid charge the system

 

 

 

 

 

 

 

 

 

 

 

Note: If all of the charge will not “go in” the

Access Valves: To use the

 

 

 

 

 

 

 

 

 

 

discharge side:

access valves:

 

 

 

 

 

 

 

 

 

 

A. Shut the discharge access valve at the ice

 

￿Remove the cap from the

 

 

 

 

 

 

 

 

 

 

 

machine.

 

stem, use a 3/16" allen

 

 

 

 

 

B. Switch the machine on.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wrench to check that the

 

 

 

 

 

C. Open the low side access valve at the ice

 

valve is CLOSED. The

 

 

 

 

 

 

 

 

 

 

 

machine.

 

remove the core cap.

 

 

 

 

 

 

 

 

 

 

 

D. Open the low side manifold valve and observe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

￿Close the valve and

Torque stem

the sight glass to be certain that only gas is flowing

 

replace the caps when

into the system.

 

to 6-8 ft.-lb.,

 

done. The valve must be

caps to 7-12

E. When the proper charge is indicated on the

 

closed and the caps must be on or

ft.-lb.

scale, shut off the manifold valve(s).

 

the valve will

 

 

 

 

 

9. Shut off the valve on the refrigerant drum.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10. Re-open the manifold valves until all liquid has

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

flowed out of the hoses.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11. Shut the low side access valve on the ice

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R-404A

machine.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tank Must

12. Remove hoses from ice machine and replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Be in Liquid

all caps.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dispensing

 

Sight Glass

Position -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check Tank!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCALE

Hose Connection Schematic for Liquid Charging

January 2007

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Page 30 Page 32
Image 31
Page 30 Page 32
Contents Introduction NME454, 654 & FME504Fuse Charge Ampacity Size 404A For the InstallerInstallation Limitations NME654 Dispenser ApplicationsSample BIN and Machine Combinations Water Limitations LocationAirflow Notice For the Installer LocationUse only ¾ rigid tubing For the PlumberFor the Electrician Final Check List Initial Start UP There are no Adjustments to MAKE, so replace the panelsComponent Description Low Pressure Cut Out SwitchNME454, 654 & FME504 Control BOX Components On/Off mode Switch Manual control forAutoSentry Control Board Control Board Protection Devices Electrical SequenceStart Up Shut DownWater Level The correct water level should be Operation WaterOperation Refrigeration Refrigeration SchematicOperation 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 Symptom Possible Cause Probable Correction Service DiagnosisSymptom Possible Cause Probable Correction Control System Diagnostics BIN Controls Ice Level Sensors Removal and Replacement Bin ControlsTo Remove the Breaker Bearing Assembly Removal and Replacement Bearing And BreakerStuck, Removal and Replacement AugerTo Remove the Auger Auger isTo 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 If the machine is off, not making ice What to do Before Calling for Service
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.
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