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// CODE SNIPPET

1402.4.1 Drain-Back Systems

2020 Mechanical Code of NYS > 14 Solar Thermal Systems > 1402 Design and Installation > 1402.4 Protection From Freezing > 1402.4.1 Drain-Back Systems
JUMP TO FULL CODE CHAPTER
Drain-back systems shall be designed and installed to allow for manual gravity draining of fluids from areas subject to freezing to locations not subject to freezing, and air filling of the components and piping. Such piping and components shall maintain a horizontal slope in the direction of flow of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope). Piping and components subject to manual gravity draining shall permit subsequent air filling upon drainage and air storage or venting upon refilling.

Related Code Sections


1402.4.1 Solar Thermal Systems, Drain-Back Systems
Drain-back systems shall be designed and installed to allow for manual gravity draining of fluids from areas subject to freezing to locations ...
2020 Mechanical Code of NYS > 14 Solar Thermal Systems > 1402 Design and Installation > 1402.4 Protection From Freezing > 1402.4.1 Drain-Back Systems
M2301.2.6.1 Solar Thermal Energy Systems, Drain-Back Systems
Drain-back systems shall be designed and installed to allow for manual gravity draining of fluids from areas subject to freezing to locations ...
2020 Residential Code of New York State > 23 Solar Thermal Energy Systems > M2301 Solar Thermal Energy Systems > M2301.2 Design and Installation > M2301.2.6 Protection From Freezing > M2301.2.6.1 Drain-Back Systems
1009.1 Boilers, Water Heaters and Pressure Vessels, Where Required
not be required in the collector loop of drain-back systems ...
2020 Mechanical Code of NYS > 10 Boilers, Water Heaters and Pressure Vessels > 1009 Hot Water Boiler Expansion Tank > 1009.1 Where Required
M2301.2.8 Solar Thermal Energy Systems, Expansion Tanks
to withstand the maximum operating pressure of the system. Exception: Expansion tanks shall not be required in drain-back systems ...
Residential Code 2015 of New York State > 23 Solar Thermal Energy Systems > M2301 Thermal Solar Energy Systems > M2301.2 Design and Installation > M2301.2.8 Expansion Tanks
Section 1009 Boilers, Water Heaters and Pressure Vessels, Hot Water Boiler Expansion Tank
not be required in the collector loop of drain-back systems ...
2020 Mechanical Code of NYS > 10 Boilers, Water Heaters and Pressure Vessels > 1009 Hot Water Boiler Expansion Tank
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