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// CODE SNIPPET

L 501.3 Recirculation Systems

2021 Oregon Plumbing Specialty Code > 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 90.2-2007:7.2]

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]

Related Code Sections


L 501.3 Sustainable Practices, Recirculation Systems
Recirculation systems shall comply with Section L 501.3.1 and Section L 501.3.2 ...
2021 Oregon Plumbing Specialty Code > L Sustainable Practices > L 501.0 Water Heating Design, Equipment, and Installation > L 501.3 Recirculation Systems
L 502.3 Sustainable Practices, Recirculation Systems
Recirculation systems shall comply with the provisions of Section L 501.3 ...
2021 Oregon Plumbing Specialty Code > L Sustainable Practices > L 502.0 Service Hot Water — Low-Rise Residential Buildings > L 502.3 Recirculation Systems
P2905.2 Water Supply and Distribution, Demand Recirculation Systems
Demand recirculation water systems shall be in accordance with Section N1103.5.2 ...
2021 Oregon Residential Specialty Code (ORSC) > 29 Water Supply and Distribution > P2905 Heated Water Distribution Systems > P2905.2 Demand Recirculation Systems
403.3.1.1.2.3 Ventilation, Multiple Zone Recirculating Systems
Where one air handler supplies a mixture of outdoor air and recirculated return air to more than one zone, the system outdoor air intake flow rate ...
2019 Oregon Mechanical Specialty Code > 4 Ventilation > 403 Mechanical Ventilation > 403.3 Outdoor Air and Local Exhaust Airflow Rates > 403.3.1 Other Buildings Intended to Be Occupied > 403.3.1.1 Outdoor Airflow Rate > 403.3.1.1.2 System Outdoor Airflow > 403.3.1.1.2.3 Multiple Zone Recirculating Systems
L 402.7 Sustainable Practices, Recirculating Shower Systems
Recirculating shower systems shall comply with IAPMO IGC 330 ...
2021 Oregon Plumbing Specialty Code > L Sustainable Practices > L 402.0 Water-Conserving Plumbing Fixtures and Fittings > L 402.7 Recirculating Shower Systems
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