Since the Wisol module is multizone, it's possible to switch RC2 and RC4. The only prerequisite is firmware revision EN029 and above (you can update the firmware OTA through GSM).
Here is how to do it:
1) Go to Service menu
2) Select About
3) When the device info loads, press the UP and DOWN arrows at the same time
4) Choose the RC zones you want to switch to, press Ok and wait about 10 seconds
5) The RC zone switch is done, please restart the device