Hi Sturge33,
I just looked over the instructions again and I'm not seeing where it says it's a plug-in.
Right out of the manual:
Input Power
The Compu Pool CPSC/CPA Series comes with a terminated
power cord that should be plugged directly into the external
time clock unit. For Canadian installations: Connect to a circuit
protected by a Class-A ground fault interrupter.
The Keyword in the above is terminated. Don't confuse the word "plugged" as an action. It would be better to read as "that should be wired directly into the external time clock unit"
Bonding
A lug for bonding is attached to the bottom of the Compu-
Pool CPSC/CPA Series enclosure. Connect to the pool bonding
system using minimum 8 AWG copper wire if required by code.
As for actual timers, that's going to depends on what you want. Mechanical or Electronic timer (examples shown
here).
I personally use an Intermatic mechanical timer w/ metal box. It's hardwired into my houses breaker box, then the CompuPool is hardwired into the timer box that has two connections. One is for the SWCG and the other is for my pool pump.