Most helpful positive review
45 of 49 people found the following review helpful
Technical details that should be in the instructions
on May 31, 2011
This a great product that I use on my vacation home's water well. The low-pressure cutoff feature is important for me since I'm not always there (and has saved the pump and the home once when water was pouring into the crawlspace from a broken supply pipe). But I recently replaced the switch after many years and found the documentation has some shortcomings. Then I found it is hard to find a way to reach technical support at this very large manufacturer's website. However, once I did find and send a webmail, I got a prompt, detailed reply, and another quick reply to a followup question.
Their general webmail address is ContactUs_Web@us.schneider-electric.com, but I think the most direct way to reach them for technical support at email@example.com.
What I learned by email is the following: "The low presssure cut off is 10 psi below the cut in pressure. No matter the pressure setting of the device, or even if you change the pressure in the field." I also learned "You can adjust the pressure anywhere in the range, cut in 5 to 45 psi and cut out 20 to 65." I had initially purchased a 30-50psi switch (FSG2J21M4) and realized the previous owner had left the pressure tank at its factory setting of 38psi, which is perfect for a 40-60psi switch, but I had to bleed it to use with my 30-50psi switch. I didn't know if I could just adjust the 30-50psi switch or needed to get a 40-60psi unit. It turns out happily to be the former, though I will need to drain the tank and repressurize it to 38psi when I adjust the switch to a higher range.
BTW, I learned by installing a pressure gauge (Flotec TC2104-P2) on the line next to the switch that if your pressure tank is pressurized higher than the cut-in pressure, as the pressure drops during use, there is a sudden drop of pressure when the tank pressure is reached, down to the cut-in pressure. What I think is happening is the pressure tank is suddenly pushing water back down the line toward the well until the pump comes on. This phenomenon disappears when the tank or the switch is adjusted so the tank pressure is the recommended 2psi lower than the cut-in pressure.