37 Hydrothermal source recirculation pump (used for the maintenance of pumps) To BS unit To BS unit To BS unit To BS unit 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. * If freezing is expected to occur, install the freezing protection heater or drain water from the water sprinkling side. (If water is drained from the water sprinkling side, pay attention so that loads will never be applied to cooling mainly.) Setting 1 (7°C) Setting 3 (33°C) Setting 2 (31°C) Setting 4 (15°C) Cooling water temperature T3 Control T2 Control T1 Control Heater ON PUMP OFF FAN OFF Water sprinkling OFF Water sprinkling ON FAN ON PUMP ON Heater OFF Opening degree Opening degree Bypass side Bypass side Setting Setting Cooling water temperature Cooling water temperature
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