Ice-O-Matic Refrigeration System Service, Instructions for Liquid Charging R404A, MFI Series

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Refrigeration System Service
Low Side High Side
R404A Tank Must Be in Liquid Dispensing Position.
Check Tank!
Hose Connection Schematic for Liquid Charging
Torque Stem to 6-8ft.-lb. Torque caps to 7-12ft.-lbs

MFI Series

Refrigeration System Service

Refrigeration

Service:

General: This ice machine uses R404A refrigerant and polyolester oil. Do NOT use mineral oil in this refrigeration system.

●When the refrigeration system is serviced, a special liquid line drier is required. It is included with replacement compressor.

●R404A is not compatible with mineral oil so these ice machines use Polyolester oil. Polyolester oil absorbs water very easily. A system opened for service must be re-sealed as soon as possible (15 minutes maximum).

●Special leak detection equipment is required to locate small refrigerant leaks. Usually a leak detector capable of detecting Halongenated refrigerant or HFC-134a will work. Check with the leak detector manufacturer if in doubt.

●Evacuate to 300 microns. ●Liquid charge the system.

Access Valves: To use the access valves:

●Remove the cap from the stem, use a 3/16 inch Allen wrench to check that the valve is CLOSED. Then remove the core cap.

●Close the valve and replace the caps when done. The valve must be closed and the caps tightened.

Instructions for Liquid Charging R404A:

In preparation for charging, the low side hose should have a sight glass, and/or a restricting device (such as a “Charge Faster”) installed in it for metering liquid into the low side of the system.

1.After a through evacuation shut off the manifold valves and switch off the vacuum pump.

2.Place a drum of R404A onto an electronic scale.

3.Attach the charging hose to the drum.

4.Open the valve on the drum and purge the charging hose.

5.Zero out the scale.

6.Shut the low side access valve at the ice machine.

7. Open the discharge manifold valve full open.

8.Watch the scale, when the correct charge is shown, shut the manifold valve.

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

a. Shut the discharge access valve at the ice machine.

b. Switch the machine on.

c. Open the low side access valve at the ice machine.

d. Open the low side manifold valve and observe the sight glass to be certain that only gas is flowing into the system.

e. When the proper charge is indicated on the scale, shut off the manifold valves.

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

machine.

12. Remove hoses from ice machine and replace all caps.

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Contents Ice-O-Matic SERVICE AND INSTALLATION MANUAL MFI Series11100 East 45th Ave Denver, ColoradoPage Introduction MFI SeriesKeep this manual for future reference PageTable of Contents Table Of ContentsMFI Series PageInspect Promptly Freight Claim ProcedureVisible Loss or Damage Concealed Loss or DamageMFI Series WarrantyPage Installation Guidelines For the InstallerElectrical Specifications AdjustmentsMFI Series For The InstallerPage Bin Application Ice Machine SpecificationsFor the Installer MFI SeriesStorage Bin LocationIce machine Water LimitationsMFI Series For the InstallerAllow 6 “Clearance for Air Circulation PageWater Inlet For the PlumberWATER COOLED MODELS AIR COOLED MODELSElectrical Connections For the ElectricianWater Cooled Models Air Cooled ModelsFor the Installer Final Check ListMFI Series PagePre-StartInspection Start UpStart Up MFI SeriesAir Cooled Model Shown Component DescriptionMFI Series PageComponent Description MFI SeriesPotential Relay The compressor start relay PageComponent Description MFI SeriesPage Ice Sweep Bearing Breaker/Divider AugerElectrical Sequence To ResetElectrical Sequence Shut DownWater System Operation WaterMFI Series PageLow Pressure Cut Out- Automatic Reset High Pressure Cut Out- Automatic ResetOperation Performance Typical Low Side PressureICE MAKING SYSTEM In place cleaning Sanitizing and Cleaningscheduled at a minimum of twice a year KEEP OUT OF THE REACH OF CHILDRENBearing Maintenance Bearing MaintenanceNote Left Hand Threads MFI SeriesBin Control Sensor Sensor MaintenanceWater Sensor MFI SeriesClean the air cooled condenser Maintenance Air CooledMFI Series Page1. Disconnect electrical power to the ice machine Auger MaintenanceAuger 2. Turn off the water supply to the ice machineSymptom Service DiagnosisPossible Cause Probable CorrectionSymptom Service DiagnosisMFI Series Possible Cause4.High pressure cut out check Control System DiagnosticsMFI Series PageWater Reservoir R&R- Water Reservoir, Bin ControlBin Controls Ice Level Sensors MFI SeriesR&R-Bearingand Breaker To Remove the Breaker Bearing AssemblyMFI Series PageTo Remove the Auger R&R-AugerMFI Series PageTo Remove the Water Seal R&R-WaterSealRemoval of the Water Seal To Replace the Water SealTo Replace the Evaporator R&R-EvaporatorTo Reassemble the Evaporator and Auger MFI SeriesR&R-GearMotor To Remove and Repair the Gear Motor AssemblyTo Check the Gear Motor To Inspect the Gear MotorR&R-FanBlade and Motor To Remove the Condenser Fan Motor AssemblyMFI Series PageService Refrigeration System ServiceRefrigeration Instructions for Liquid Charging R404AWiring Diagram MFI0500 Air, MFI0500 Water MFI0500 Wiring DiagramMFI Series PageMFI Series MFI0800 Wiring DiagramPage Wiring Diagram MFI0805, MFI1255 Air MFI0805/1255 Wiring DiagramMFI Series PageWiring Diagram MFI1256 Air MFI1256 Wiring DiagramMFI Series PageWhat to Do Before Calling for Service Service HistoryMFI Series Page
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