Ice-O-Matic EMF Series Mixing Valve Diagnosis Problem Possible Cause Remedy, Liquid Line Solenoid

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Flake Ice Machines

 

Refrigeration System

Mixing Valve Diagnosis:

 

 

Problem

Possible Cause

Remedy

1.Head pressure low, Line between valve and receiver cold.

Ambient condenser temp. below 70°F (21°C)

a. Valve defective, not

a. Replace valve

allowing discharge

 

gas into receiver

 

2.Head pressure low, Line between valve and receiver hot.

3.Head pressure low, Line returning from condenser is cool.

Ambient condenser temperature is above 70°F (21°C)

a. System low on

a. Leak check. Recover

charge.

refrigerant and weigh

b. Valve defective, not

in proper charge.

allowing liquid into

b. Replace valve.

receiver.

 

a. Valve defective, not

a. Replace valve.

allowing refrigerant

 

through condenser.

 

Pump Down System (Remote Only)

The pump down system prevents liquid refrigerant from migrating to the evaporator and compressor during the off cycle and prevents the compressor from slugging or starting under an excessive load.

Liquid Line Solenoid

When a machine with a remote condenser shuts off, the liquid line solenoid valve, located at the outlet of the receiver, is de-energized causing the valve to close completely restricting the flow of refrigerant. The compressor will pump all of the refrigerant into the condenser and receiver.

As the system pumps down, the pressure on the low side of the system

drops. When the suction pressure drops to 19 psi (1.3 bar), the pump down control opens and shuts the machine off. See page G5 for pump down control operation. Liquid refrigerant is stored in the condenser and receiver while the machine is off. It is normal for the machine to pump down once or twice an hour as the pressures equalize.

When the machine comes back on (the bin switch closes or the selector switch placed to the ICE position), the liquid line solenoid valve opens and the refrigerant is released from the receiver. When the suction pressure rises to 45 psi (3.1 bar) the pump down control closes and the machine comes back on. If the machine will not pump down, the valve may not be closing all the way. A weak compressor will also prevent the machine from pumping down. Check for signs of a weak compressor before replacing the liquid line solenoid. Prior to replacing the valve, disassemble and check for obstructions that may not allow the valve to seat.

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Contents Service and Installation Manual Page Table Of Contents Flake Ice MachinesHow To Use This Manual Model and Serial Number Format Model Numbers EF 80 0 a General InformationSerial Number Date Code Page Electrical and Mechanical Specifications RLA LRAInstallation Guidelines Ambient Operating Temperatures Electrical SpecificationsAdjustments DrainsEF Series EMF Series EMF Series 48 Inch Wide A10 Parts and Labor Domestic & International Limited Warranty ICE-O-MaticGeneral Operation Evaporator Float Gear Reducer Belt Auger MotorScheduled Maintenance Maintenance ProcedureCleaning and Sanitizing Instructions Winterizing Procedures Winterizing ProceduresCabinet Care Cleaning Activity Cleaning AgentMethod of Application Troubleshooting Trees How To Use The Troubleshooting TreesMachine Runs, Does Not Make Ice Flake Ice Machines Machine Does Not Run Slow Production Low Production High Suction Pressure Machine Freezes Up Auger Seizes Auger Motor Amp Draw Fluctuates Water Leaking From Bottom of Evaporator Machine Produces Wet Ice C12 Noise Coming from Evaporator Water System Water SystemFloat Valve and Reservoir Drip Boot Water Seal and Lower O-RingDrive System Drive SystemCoupler Evaporator Disassembly Evaporator and Internal ComponentsRemove 2 setscrews Evaporator Barrel and Auger Inspection Bearings, Water Seal and O-Rings Seal Face Installation Evaporator ReassemblyExploded View of the Evaporator Refrigeration System and Components Refrigeration SystemCompressor Page Refrigerant Pressures EF/EMF450A Page High Pressure Safety Water Cooled CondenserWater Regulating Valve Air Cooled Condenser RemoteExpansion Valve Expansion Valve Diagnosis Symptom ProblemRemedy Production CheckEvaporator Remote Condenser Remote SystemMixing Valve L.A.C., Headmaster Pump Down System Remote Only Mixing Valve Diagnosis Problem Possible Cause RemedyLiquid Line Solenoid Receiver RefrigerantMethod of Charging Refrigerant F14 Selector Switch Electrical SystemControl Circuit ContactorCapacitors Overload ExternalStart Relay Bin Control Safety ControlThermostatic Bin Control Mechanical Bin Control Auger Motor RelayCompressor Delay Pump Down ControlEF250/255/405 EF450A/W 9071694-01 EF800A/W 9071963-01 EMF450/405A/W 9071958-01 EMF800A/W EMF705/1005/1006A/W 9071956-01 EMF1106R EMF2306A/W EMF2306R EMF2305L 9071959-01 Page

EF Series, EMF Series specifications

Ice-O-Matic is a recognized leader in the ice-making industry, known for its innovative technologies and commitment to quality. Among its flagship products are the EMF Series and EF Series ice machines, designed to meet the demands of various commercial environments. These machines combine advanced features with user-friendly functionalities, making them suitable for restaurants, bars, hotels, and convenience stores.

The EMF Series stands out with its capability to produce ice in a range of styles, including half cubes, full cubes, and gourmet ice. This versatile output makes it an excellent choice for establishments that require different ice types for various applications. The EMF machines are designed with a built-in storage bin, optimizing floor space while ensuring a continuous supply of ice. With production capabilities that can range from 200 to 800 pounds of ice per day, they cater exceptionally well to high-volume demands.

On the other hand, the EF Series focuses on efficiency and reliability. Featuring modular designs, these machines can be stacked or used in tandem, providing flexibility for businesses as their needs evolve. The EF Series offers a robust production range, capable of generating up to 1,500 pounds of ice daily, allowing it to service larger venues without sacrificing performance. The high-density foam insulation ensures that ice stays intact longer, reducing waste and enhancing overall efficiency.

Both series are equipped with Ice-O-Matic’s innovative Pure Ice technology, which not only ensures high-quality ice but also addresses concerns related to water quality. The built-in water filter options reduce impurities, resulting in clearer and more appealing ice. Additionally, these machines utilize an easy-to-clean design, promoting hygiene and maintenance simplicity. The front-access service doors facilitate straightforward maintenance, further minimizing downtime in busy environments.

Both EMF and EF Series machines are energy-efficient, boasting ENERGY STAR certifications. They are built with an environmentally friendly refrigerant, which helps establishments reduce their carbon footprint while saving on energy costs.

In conclusion, Ice-O-Matic's EMF and EF Series ice machines bring together cutting-edge technology, versatility, and efficiency, making them prime choices for any commercial establishment seeking reliable ice production. Their superior design features, user-friendly maintenance, and commitment to quality ensure that they meet the varied demands of the foodservice industry while promoting sustainability.
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