I suggest you deviate from the instructions for the Phanteks PWM Hub slightly. Its instructions are designed to avoid trouble when you have a mobo with a certain type of CHA_FAN header, and you do NOT have that problem, so there is a better way to use the Hub.
1. Follow the instructions with the Corsair H115i unit. The pump unit has three types of cables from it. One ends in a 3-pin female fan connector, and it plugs into your mobo's CPU_FAN header. (You do not need to use the mobo's CPU_OPT or W_PUMP headers.) There's a two-headed cable that allows you to connect both radiator fans to the pump unit. Finally, there is a cable to connect the pump unit to a mobo USB2 header. After you have your whole system set up and have your OS installed, you must then download from the Corsair website their Corsair Link software and install that. It takes over managing the H115i system, and communicates with it via that USB connection. This system uses a temperature sensor built into the CPU chip itself to guide the H115i cooling system and keep CPU temperature under control.
2. The Phanteks PWM Hub has three types of connections. One is a 4-pin female fan connector and it must plug into one of your mobo's CHA_FAN headers. One is a power input connector and it plugs into a power output from the PSU - I think it uses a SATA power connector, but I'm not sure. After that, you have six 3-pin fan ports on the Hub itself, and that's where you plug in your case ventilation fans. Make SURE that there is a fan plugged into the white Port #1 if the Hub. That is the only one that can send a fan speed signal back to the mobo for monitoring.
3. You should check and update if needed some settings in BIOS Setup. See manual p. 3-2 to start. To enter Setup, hold down the "Del" key when you power on the machine. Don't just tap it because the machine may not be "looking" at the keyboard just at that time. Hold it down until the opening screen of Setup appears. This gets you into EZ Mode, see p. 3-3. Look at the screen bottom: there's prompt to push F7 to go to Advanced mode, so do that - see p. 3-4. Along the top are menu choices, so choose Monitor. Go to p. 3-47 of the manual, then 3-48. For "CPU Q-Fan Control", ensure that it is set to "Auto". On p. 3-49 go to "Chassis Fan 1-2 Q-Fan Control" and set it to "PWM Mode" so that the headers will send out the PWM signal that your Hub needs. Under "Chassis Fan 1-2 Q-Fan Source" set it to "MotherBoard". Down a few items to "Chassis Fan 1-2 Profile" and ensure it is set to "Standard". When these are all set, click on "Exit" at the top line menu to get to the Exit screen. There click on "Save Changes & Reset" to save your new settings and reboot the machine. These steps will ensure that the CPU cooling is done according to the temperature measured inside the CPU, and the case cooling is done according to the temperature measured by a different sensor built into the mobo. Both control systems (including your H115i system) will be under automatic control you don't need to worry about. They will change their cooling fans as required to keep your system under control.
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