Had some kids let the air out of the captive air tank on the sprinkler pump system. Was wondering the correct way to recharge the air. Do I need to turn off the pump and depressurise the system or just charge it as it sits ?? Seems I remember the air charge was about 40psi, does that sound about right for a sprinkler system with a 20 / 40 psi switch ?
Can't find anything in the instructions.
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