YUELLY’s IDU includes one small size built-in buffer tank, one main circulation water pump, one space heating/cooling circulation water pump, one DHW pump, safety valve, water charge valve and expansion tank, electrical heater. When installed the unit, installer should connect the heat pump directly to the IDU while the buffer tank (for space heating/cooling) is considered whether to add or not. Storage water tank is needed for the domestic hot water application. Temperature sensor should be added in the storage water tank.

Apart from the heat pump unit, IDU is an integration of all main components, including water pump, valves, filters, constant pressure water replenishment device, electric control cabinet, etc.

Three DC inverter Grundfos water pumps are used to guarantee the best quality of product.

Pressure relief valve is also called a safety valve, which is one of the most important type of safety valves, this type of valve sets a limit on the rise of pressure within a hydraulic line in normal operation, the valve is closed and no fluid passes through, but if the pressure in the line exceeds the limit the valve opens to relieve the pressure, this protects heat pump from becoming damaged from high pressure.

Unlike the traditional heat pump system in which a three-way valve is used for controlling the space heating and water heating, the EasyHydro uses an advanced technology to realize this control without three-way valve.

The automatic refill valve can automatically maintain the pressure of the system at the set value and can prevent the hot water from the heating system from returning to the cold water pipe, achieving accurate pressure and system stability.