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3 Configuration method and selection criteria of flow rate adjustment device In this system, a flow rate adjustment device is installed in the secondary side circuit to perform secondary side flow rate adjustment control by outputting 0 to 10 V from the unit. * 10-V power supply is not supplied. The following shows a system configuration example of the flow rate adjustment device and notes on the system configuration. The following three system types are recommended as flow rate adjustment devices: 1. System using a three-way valve 2. System using a two-way valve 3. System using an inverter 1. System using a three-way valve Notes on selection method and system configuration Notes on pump selection and connection Overview of system This system has a pump provided at the outlet of the tank and a three-way valve provided downstream of the pump, and adjusts the flow rate by controlling the opening and closing of the three-way valve. Wiring connection places ON/OFF signal 0 to 10 V output Three-way Pump valve Flow rate output device Flow rate adjustment device Pump Three-way valve 1-3 of CN512 of control board (ON/OFF output) Sub box terminal block No. 10, 11, 12 • Calculate the total pump head according to the system at the site and then select a pump capable of outputting the minimum flow rate of about 3 l/min and maximum flow rate of about 30 l/min with the necessary pump head for the piping at the site. • When selecting the pump, please note that output at a high flow rate will not occur if the flow rate with the pump head of the system at the site is low, and output at a low flow rate will not occur if the flow rate is too high. • Be sure to check that the flow rate becomes 20 to 30 l/min at the maximum output during a flow rate adjustment test run (refer to page 37). For how to check the flow rate, refer to page 38. * If the flow rate is not within the range of 20 to 30 l/min, select a different pump or adjust the maximum frequency using an inverter, etc. so that the maximum flow rate of 20 to 30 l/min is achieved. * To select a proper pump, first select a pump that supports slightly high flow rate, and then adjust the frequency with an inverter so that the flow rate becomes 20 to 30 l/min at the maximum output. (In that case, an inverter is necessary to be prepared separately.) Notes on three-way valve selection and connection • Use a valve that is capable of adjusting the flow rate with a 0 to 10 V input. • Calculate the Cv value and select a valve that supports an appropriate rate. • Select a valve of which the ratio of the maximum flow rate and the minimum flow rate will be at least 1:10. • Place the three-way valve downstream of the pump. Connect one outlet to the heat exchanger. Connect the other outlet to the lower part of the tank. • Carefully read the instruction manual and use the three-way valve in accordance with the usage procedures. 18PDF Image | QAHV-N560YA-HPB
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