In a prime location on Spencer Street in Melbournes CBD the brief for this brand new state of the art police station was quite specific – construct to exacting security standards but with a 5 star Green energy rating. The internal hot water plant was very specific also with 2 sources of preheated water (to save on fuel costs) and a maximum allowable water temperature to be circulated around the building. Using our warm water valve as the basis we were able to design and construct a complex safety and preheat blending valve system. In simple terms the control system makes a determination on which preheated water source (solar thermal or co-generation) is the most beneficial, using temperature, and supplies this to the Demand Duo as preheated water. In certain circumstances the preheated water could reach temperatures above the set point of the Demand Duo which could potentially damage plumbing infrastructure and fittings. To prevent this from occurring there is an inbuilt safety control feature.
Rinnai’s Hot water solution
2 x Demand Duo 4 internal with natural draft common flue, two forms of preheat and a unique safety and preheat blending control valve.