【PERFECT COMPATIBILITY】Long Term ZRUA hard start kit is applicable to 1-2-3 ton AC unit. The kit includes 1 ZRUA hard start capacitor kit, 1 cable tie and 2 screws. UL certified, replaceable:CSR-U1 Hard Start Capacitor Kit, HVAC Hard Start Capacitor 1-2-3 Tons Hard Start Kit FOR Air Conditioner. It is made exactly fit for most AC brands. 【EASY TO INSTALL】1-2-3 method has been recognized by major compressor manufacturers, which is safer and easier to install.There are only 3 color coded wires which need to be connected. The Black wire will be connected to the Common side of the compressor. The Striped wire will be connected to the Start winding of the compressor and the Red wire will be connected to the Run winding of the compressor. 【FIX THE PROBLEM】ZRUA compressor saver reduces the time required for compressor start-up about 30-50%. The CSR-U1 Starting Capacitor uses a powerful multilayer starting capacitor and smart switches to provide the compressor with the boost needed to start faster, more reliably and consume less power. 【UPGRADE QUALITY】Long Term ZRUA hard start kit meets or exceeds all manufacturer specifications, is made of durable high-quality materials, and has been well-tested by the manufacturer. It is designed as a tool for professional service technicians. Note: Do not panic if you notice the compressor economizer expanding during use. This is due to extended use, high external temperatures, and the production of gas inside, rather than an explosion. 【POWER INCREASE】This compressor hard start kit gives compressors a higher starting torque. It also increases air conditioning and refrigeration system energy efficiency by as much as 98%,and extends the service life of compressors and other electrical components related to air conditioning systems. The CSR-U1 start capacitor uses a powerful multi-layer starting capacitor and a smart switch to give your compressor the boost it needs to start up quickly,The voltage floods or spikes can be extremely harming to HVAC units, shortening the life of the compressor and diminishing its efficiency.