Ice-O-Matic MFI Operation Performance, Typical Low Side Pressure, Typical Discharge Pressure

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MFI Series

Operation: Performance

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 then it condenses into a liquid.

This high pressure liquid then goes through the liquid line to the expansion valve. The thermostatic expansion valve meters liquid refrigerant into the evaporator, the volume of liquid refrigerant depending upon the temperature of the evaporator.

At the evaporator, the refrigerant enters an area of relatively low pressure, where it can easily “boil off” or evaporate. As it evaporates, it absorbs heat from the evaporator and whatever is in contact with it (such as water inside it). After the evaporator, the refrigerant, now a low pressure vapor, goes through the suction line back to the compressor, where the cycle is repeated.

Typical Low Side Pressure:
Air Cooled:	34-38 PSIG
Typical Discharge Pressure:
Air Cooled:	220-275 PSIG
Typical Compressor Amp Draw:
MFI0500AS 115/60/1	8-9 Amps
MFI0500WS 115/60/1	8-9 Amps
MFI0800AS 115/60/1	8-9 Amps
MFI0806AS 208-230/60/1	5-6 Amps
MFI0806WS 208-230/60/1	5-6 Amps
MFI0805AS 230/50/1	5-6 Amps
MFI1256AS 208-230/60/1	5-6 Amps
MFI1255AS 230/50/1	5-6 Amps
Typical Auger Drive Motor Amp Draw:
MFI0500AS 115/60/1	4.0 to 4.5 Amps
MFI0500WAS 115/60/1	4.0 to 4.5 Amps
MFI0800AS 115/60/1	4.0 to 4.5 Amps
MFI0806AS 208-230/60/1	1.6 to 3.8 Amps
MFI0806WS 208-230/60/1	1.6 to 3.8 Amps
MFI0805AS 230/50/1	1.6 to 3.8 Amps
MFI1256AS 208-230/60/1	1.6 to 3.8 Amps
MFI1255AS 230/50/1	1.6 to 3.8 Amps
Expansion Valve Superheat:	6-8 degrees
High Pressure Cut Out- Automatic Reset:	450 PSIG
Low Pressure Cut Out- Automatic Reset:	15 PSIG
Refrigerant Charge: R404A
MFI0500 Air Cooled	22 Ounces
MFI0500 Water Cooled	18 Ounces
MFI0800 Air Cooled	24 Ounces
MFI0806 Air Cooled	24 Ounces
MFI0806 Water Cooled	20 Ounces
MFI0805 Air Cooled	24 Ounces
MFI1256 Air Cooled	36 Ounces
MFI1255 Air Cooled	36 Ounces
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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 DamageWarranty MFI SeriesPage Installation Guidelines For the InstallerElectrical Specifications AdjustmentsFor The Installer MFI SeriesPage 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 PageMFI0800 Wiring Diagram MFI SeriesPage 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