Horstman HRT4-ZW and ASR-ZW - Stupid question


I got the HRT4-ZW and ASR-ZW along with a veralite and some other bits recently and am looking to get this set up. My houses heating is already controlled by a programmable timesclock so the stupid question; having installed this (i will be getting someone better qualified to do so) is it simply a case of leaving the current timeclock to ‘always on’ therefore handing over control to the reciever?

Pardon my ignorence

I should think that the ASR-ZW would be installed in-place of your current programmer.