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Ice machines are an integral part of numerous establishments, including restaurants, hotels, hospitals, and cafeterias. While they may seem like innocuous appliances, if not properly maintained, ice machines can become a hidden source of cross connection issues and lead to significant consequences.

The Model B Pressure Regulating Valve is a self-operated spring-loaded pressure regulating valve typically installed in the supply line to boiler fuel metering valves.

Follow manufacturer recommendations: Refer to the ice machine's user manual and guidelines provided by the manufacturer to understand the recommended filter change frequency and procedures. Implement a maintenance schedule: Create a schedule that includes routine filter changes, cleaning, and sanitization of the ice machine. Assign responsibility to designated staff members to ensure timely filter replacements. Monitor water quality: Regularly test the water supply to identify any changes in water quality that could impact the ice machine's performance or introduce contaminants. Implement appropriate water treatment methods if necessary. Train staff: Educate employees about the importance of regular maintenance, including filter replacement, and provide training on proper cleaning and sanitization techniques. Engage professional services: Consider engaging professional maintenance services for comprehensive inspections, cleaning, and maintenance of your ice machine to ensure optimal performance and compliance with health and safety regulations. Test: To ensure compliance, follow the water purveyor's requirements and conduct the necessary testing on your ice machine's backflow assembly, if applicable.

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Furthermore, it is crucial to be aware of specific incidents and studies that highlight the importance of maintaining ice machines and their filters. For example, a recent article published on IDSE.net titled "Mycobacterial Infections in Cardiac Patients Tied to Ice Water Machines" sheds light on the potential dangers of neglected ice machines. The article emphasizes how mycobacterial infections in cardiac patients were linked to contaminated ice water machines.

To mitigate the risks associated with neglected ice machine filters, it is essential to establish a regular maintenance routine and adhere to best practices:

The Model B is a ½" or 1" NPT, 250 lb. cast bronze body, stainless steel trim and disk.  The valve has a Viton diaphragm rated for 300° F maximum temperature.

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Additionally, according to the Texas Commission on Environmental Quality (TCEQ), all testable backflow assemblies protecting against health hazards must undergo annual testing. This requirement ensures the safety and integrity of the water supply.

For assistance with your Cross-Connection Control program, reach out to Hardin & Associates via email at info@hactexas.com or call 972.823.8800. You can also visit our website at www.hactexas.com for more information.

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According to the article, several cases of mycobacterial infections were traced back to ice water machines in a hospital setting. These infections can be severe and pose a significant risk to individuals with compromised immune systems, such as cardiac patients. The study underscores the need for diligent maintenance, including regular filter changes, to prevent the growth and transmission of harmful microorganisms.

The Model B Pressure Regulating Valve is a self-operated spring-loaded pressure regulating valve.  This valve is installed to sense downstream pressure to maintain a constant supply pressure to the fuel metering valves.

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Regulating valve

Neglected ice machine filters can turn a seemingly harmless appliance into a source of cross-connection and potential health hazards. Regular filter changes and appropriate backflow devices and assemblies are essential to prevent the infiltration of contaminants into the ice production process.

The Model B is designed for pressure reduction and closes tight for dead end service.  In times when the boiler is not operating, pressure will not bleed through.  Installation of a shutoff valve prior to this valve, would still be good design practice.

Cross connections occur when a contaminated source comes into contact with the potable water supply, which can result in the backflow of contaminants. Ice machines, particularly those connected directly to the water supply, can create potential cross connection points if the filters are not regularly changed. Filters play a vital role in preventing debris, sediment, and other impurities from entering the ice-making system. Over time, these filters become clogged and lose their effectiveness, making it easier for contaminants to seep into the ice production process.

In Texas, the TCEQ rules do not have explicit provisions for the requirements of backflow assemblies for ice machines with filters. However, the overarching principle that prohibits unprotected cross connections between potable water and potential sources of contamination or pollution effectively addresses this lack of specificity.

Consequently, the regulations pertaining to ice machines can vary depending on the jurisdiction. Although this may result in some variations in approach, the fundamental guiding principle remains consistent. As an example, certain jurisdictions may exempt the testing of ice machine backflow assemblies if there is consistent evidence that the filters are being replaced according to the manufacturer's recommendations, typically at regular intervals of a few months.

Consequently, certain jurisdictions mandate the installation of a backflow assembly for ice machines equipped with filters, regardless of whether the ice machine has an internal "air gap." It's worth noting that this internal "air gap" typically does not meet the criteria of an air gap as defined in the realm of cross-connection control.

Failure to change ice machine filters regularly can introduce harmful substances and microorganisms into the ice, leading to potential health risks. Contaminants such as bacteria, viruses, mold, and even chemical residues from cleaning agents can compromise the safety and quality of the ice. When consumed, contaminated ice can cause gastrointestinal illnesses, respiratory problems, and other adverse health effects, especially in individuals with weakened immune systems.