Thought I should jump in here to clarify what Superman is saying.
On the CTB16PC (and I believe all AC LOR controllers, identified starting with CTB for residential grade or LOR for commercial grade), channels 9-16 is what also powers the controllers circuitry so this side must be 240v (or 110v for the US).
The AC boards can either have one power input and a jumper lead (if the voltage for both sides is identical) or two power inputs (one for each side, also known as a bank). The left bank, channels 1-8, can indeed have a lower voltage but this voltage MUST still be AC. For example, 24v AC. Feeding DC to this type of controller may damage it. I have personally never attempted to set up a controller in this configuration, however.
EDIT: What David_AVD says.
On the CTB16PC (and I believe all AC LOR controllers, identified starting with CTB for residential grade or LOR for commercial grade), channels 9-16 is what also powers the controllers circuitry so this side must be 240v (or 110v for the US).
The AC boards can either have one power input and a jumper lead (if the voltage for both sides is identical) or two power inputs (one for each side, also known as a bank). The left bank, channels 1-8, can indeed have a lower voltage but this voltage MUST still be AC. For example, 24v AC. Feeding DC to this type of controller may damage it. I have personally never attempted to set up a controller in this configuration, however.
EDIT: What David_AVD says.