I'm replacing my old pool filter, which returned water through an old Leslie's Coppertherm heater. I've never used the heater and it was filled with all kinds of dry leaves and dirt. So before plumbing in the new filter, I decided to test if the heater works and either connect it to the system or leave it out. I cleaned out dirt from heater and disconnected the pump from timer so that I can test the heater without turning on the pump. The pump had two black wires going to it, and I disconnected them. In this picture I circled the two black wires going to pump.
In this picture pump wires are disconnected.
Then I turned on the breaker and turned on the timer by manually flipping the switch. I heard a loud pop and it smelled burnt. I'm glad I didn't get shocked because I think it's a 220 volt line (based on the fact that it's controlled by a doubled breaker). I don't know what happened. Well, I think that what I did was not the right way to disconnect the pump, and I'm guessing that maybe what burnt out was some kind of safety device. So I have the following questions:
* Do you know what I did wrong and what it is that burnt out?
* What is the right way to disconnect the pump?
* I decided to take out the heater because the display panel doesn't seem to come on, plus I live in Southern California and a few days of summer heat is enough to get the pool warm enough for me. I'm planning to get the same type of timer. If I don't connect the heater, do I need to get a different model of timer?
Thanks for your help!
Here's the picture of the heater, if anyone is interested: