This document is an instruction manual for the ACTIVALTM electric three-way valve VY54X0L (JIS 10K-FC200). The valve is compact, lightweight, and durable, with low power consumption and linear characteristics. It can be operated using different control signals, including nominal 135 Ω feedback potentiometer, nominal 135 Ω resistance input, 4-20 mA DC input, 2-10 V DC input, and 0-10 V DC input. The product is suitable for general air conditioning control and must be used within the specified operating range.