6 Original hot water supply system Thanks to the original hot water supply system, primary circuit keeps airtight and legionella bacteria seldom grows, thus no need for legionella prevention mode. Variable hot water storage volume Stratification within the tank can be kept properly because hot water stores from top of thermal store tank. QUHZ can choose hot water storage volume (E. Save/ Normal). When the DHW storage volume shows a decrease of 50 L from the DHW max. amount, DHW mode operates and the flow from the primary heating circuit is diverted to heat the water in the thermal store tank. When the amount of the stored hot water reaches the DHW max. amount or if the DHW max. operation time set by the installer is exceeded DHW mode ceases to operate. Heat pump 150L Heat pump 100L Heat pump 150L Heat pump 200L Heat pump DHW Inner view Outer view Thermal store tank Plate heat exchanger DHW Storage Volume DHW max. amount DHW restart amount E. Save Normal Unique Twisted & Spiral Gas Cooler to Maximise Heat Transfer The twisted & spiral gas cooler (heat exchanger) is Mitsubishi Electric's unique technology. Three connected refrigerant pipes are wound around the twisted water pipe which maximises the heat transfer area. Twisted water pipe with the refrigerant pipe spiralled around it Cut section detail HOT COLD Enhanced Water Flow Whilst Maintaining Optimum Water Pressure The continuous spiral grooves in the twisted pipe accelerates the turbulence effect of water and also helps to reduce pressure loss within the heat exchanger. Optimum Water Temperature is Maintained This system uses a heat store rather than potable stored water to enable good stratification of the heat store which maintains the systems efficiency and allows fresh cold water to be instantly heated up through the integrated heat exchanger which will eliminate any potential issues with legionella associated with traditional stored water systems in the tank. Mode Selection The user can select a mode to suit usage and occupancy. In Normal Mode the system stores enough heat to deliver around 250L of hot water, in E.Save Mode the system will store enough heat to deliver around 120L of hot water. When the Domestic Hot Water (DHW) storage volume shows a decrease of 50L from the DHW max. amount, DHW Mode operates and the flow from the primary heating circuit is diverted to heat the water in the thermal store tank.
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