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// CODE SNIPPET

L 501.3 Recirculation Systems

2018 Uniform Plumbing Code of Nevada > L Sustainable Practices > L 501.0 Water Heating Design, Equipment, and Installation > L 501.3 Recirculation Systems

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Recirculation systems shall comply with Section L 501.3.1 and Section L 501.3.2.

L 501.3.1 For Low-Rise Residential Buildings

Circulating hot water systems shall be arranged so that the circulating pump(s) are capable of being turned off (automatically or manually) where the hot water system is not in operation. [ASHRAE 90.2:7.2]

L 501.3.2 For Pumps Between Boilers and Storage Tanks

Where used to maintain storage tank water temperature, recirculating pumps shall be equipped with controls limiting operation to a period from the start of the heating cycle to a maximum of 5 minutes after the end of the heating cycle. [ASHRAE 90.1:7.4.4.4]

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