@febiii @sublog He probably said this because we do normally recommend to not do both a master valve and a pump. The reasoning is there is a chance that you can overload your controller, as it will be powering a valve, the pump relay, and the master valve all at one time. This is from our support site:
Make sure that the total draw of the Pump Start Relay plus the draw of the valve does not exceed 1.3 amps at 24 VAC, 60 Hz. The controller does not provide main power for a pump.
So your valve, master valve, and pump relay cannot exceed that. If you want more info on that, here is the article: http://support.rachio.com/article/473-advanced-wiring. Let me know if I can answer any other questions!