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In the interest of Legionella prevention, OSHA has different recommendations: While these are all prudent measures when it comes to energy conservation, there is a problem. When used to maintain storage tank water temperature, recirculating pumps shall be equipped with controls limiting operation to a period fromt he start of the heating cycle to a maximum of five minutes after the end of the heating cycle. Temperature controlling means shall be provided to limit the maximum temperature of water delivered from lavatory faucets in public facility restrooms to 110°. Recirculating hot water systems must be equipped with automatic time switches orother controls that can be set to switch off the usage of the temperature maintenance system during extended periods when hot water is not required. While recirculation is great for convenience and water conservation, it does involve additional energy usage, which is why the ASHRAE 90.1 also includes the following mandatory provisions: The problem is that these parameters are in direct conflict with OSHA’s requirements for Legionella prevention.Īs we noted in our last blog, domestic hot water recirculation is a requirement of ASHRAE 90.1 – 2010 and is on its way to becoming part of commercial building codes throughout the U.S. In an effort to minimize the energy penalty associated with mandatory domestic hot water recirculation, ASHRAE 90.1 has created operational parameters for these systems. When it comes to domestic hot water recirculation design, OSHA safety provisions and ASHRAE 90.1 energy efficiency requirements have put plumbing engineers between the proverbial rock and hard place.