35 Note: Pleased be noted that this Schematic Diagram is absolutely for reference only. Practically, construction methods may vary with projects. Therefore, consult with the architect office for the design and construction of the system. The following section shows precautions for the design of systems, which should be thoroughly observed. 1. Temperature The operating range of hydrothermal cooling/heating free VRV (RWEY) is 10°C to 45°C. Keep the water temperature in the system within the said range through the ON/OFF operation of 2-way control valve, three-way control valve, cooling tower, or boiler. 2. Water quality The hydrothermal cooling/heating free VRV (RWEY) requires quality stability of water to be used. Be sure to install the hermestic cooling water or, in order to install the open type cooling water, install the heat exchanger to break off the line concerned. 3. Freezing Freezing protection should be provided for the cooling tower water during wintertime. Take some sort of measures shown below so that water on the primary and secondary side of the cooling water will not freeze up during wintertime. Typical measure: If the water temperature drops, Start the pump to recirculate water. Provide freezing protection using freezing protection heater. Provide water temperature drop protection through the forced startup of the boiler. Drain water from the cooling tower. Particularly, if the unit should stop for an extended period of time, it may freeze up. Consequently, attention should be paid for this point. 4. Air drift Provide constant amount of feed water through the installation of reverse return piping system and constant flow control valve. Typical modification to Part A (Three-way valve Two-way valve) Typical modification to Part B (Three-way valve Two-way valve) Heat exchanger T1 Control Pump Temperature controller Three-way valve (mixed type) Y strainer Flexible joint Pressure gauge Thermometer Flow switch Opening degree Opening degree Bypass side Bypass side Setting Setting Cooling water temperature Typical set values (reference values) Cooling water temperature T2 Control T3 Control Cooling (mainly for cooling) Heating (mainly for cooling) Open/Closed of valve In-between seasons (cooling/heating combination) Operation mode T1 set value T2 set value T3 set value 15°C 33°C, 31°C 25°C 20°C 33°C, 31°C 40°C Temperature indicating controller Temperature indicating controller Temperature indicating controller
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