Recently bought a house with a pool and the heater needed work. I had a guy come to add a new pressure switch and on/off for the heater. He also mentioned that I need to make sure to turn the heater off at least 5 minutes before turning the pump off.
So I'm confused because I have an intermatic timer that turns on/off the pump. When the pump goes off, the heater will turn off automatically by the pressure switch, but the service guy said that it's not a good idea to have them both shut down at the same time because it could cause damage. So for the last week, I've been manually turning the pump and heater on and off in the morning and evening and haven't been using the timer which is a real pain. I want to have this automated but I don't understand how the heater can be automated while the pump is being automated... I've attached a photo of my timer. What is the norm to automate pump/heater shut on/off???