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// CODE SNIPPET

A5.207.2.4.6 Variable Flow Controls

Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures > A5.207.2.4.6 Variable Flow Controls
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A5.207.2.4.6.1 Variable Speed Drives

Individual pumps serving variable flow systems and having a motor horsepower exceeding 5 hp shall have controls and/or devices (such as variable speed control) that will result in pump motor demand of no more than 30 percent of design wattage at 50 percent of design water flow. The pumps shall be controlled as a function of required differential pressure.

A5.207.2.4.6.2 Pressure Sensor Location and Set-Point

  1. For systems without direct digital control of individual coils reporting to the central control panel, differential pressure shall be measured at or near the most remote heat exchanger or the heat exchanger requiring the greatest differential pressure.
  2. For systems with direct digital control of individual coils with central control panel, the static pressure set point shall be reset based on the valve requiring the most pressure and the set- point shall be no less than 80 percent open. The pressure sensor(s) may be mounted anywhere.

Exceptions:

  1. Heating hot water systems.
  2. Condenser water systems serving only water-cooled chillers.

Related Code Sections


A5.207.2.4.6 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Variable Flow Controls
Individual pumps serving variable flow systems and having a motor horsepower exceeding 5 hp shall have controls and/or devices (such as variable ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures > A5.207.2.4.6 Variable Flow Controls
A5.207.2.4.6 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Variable Flow Controls
Individual pumps serving variable flow systems and having a motor horsepower exceeding 5 hp shall have controls and/or devices (such as variable ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures > A5.207.2.4.6 Variable Flow Controls
A5.207.2.4 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Hydronic System Measures
pumps serving variable flow systems and having a motor horsepower exceeding 5 hp shall have controls and/or devices ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures
A5.207.2.4.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Hydronic Variable Flow Systems
HVAC chilled and hot water pumping shall be designed for variable fluid flow and shall be capable of reducing pump flow rates to no more than ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures > A5.207.2.4.1 Hydronic Variable Flow Systems
A5.207.2.4.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4], Hydronic Variable Flow Systems
HVAC chilled and hot water pumping shall be designed for variable fluid flow and shall be capable of reducing pump flow rates to no more than ...
Los Angeles Green Building Code > A6.1 — Voluntary Standards for Health Facilities [OSHPD 1, 2 & 4] > A5.207 [OSHPD 1, 2 & 4] HVAC Design, Equipment and Installation > A5.207.2 Space Conditioning Systems > A5.207.2.4 Hydronic System Measures > A5.207.2.4.1 Hydronic Variable Flow Systems
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