ABSTRACT
This chapter describes procedures for balancing water systems using direct flow measurements. The use of direct reading flow meters is considered the most reliable and accurate method of determining flow in a water system. Conventional balancing is testing and balancing from the pump to the terminals. It is based on familiarity with system type to select the best balancing procedure. Water systems designed with three-way Automatic Temperature Control Valves on the coils and constant volume pumps are constant volume systems. In most cases, the bypass balancing valve should be throttled since normally the coil has a higher pressure drop than the three-way valve and more water will flow through the valve when it is in the bypass position. Proportional balancing the water distribution system is testing and balancing the water flow at each terminal first and then at each branch, riser, and header.
