Yes that’s correct. The air pressure in the field pipe is to monitor for any leaks. If you get a low air supervisory only the system will not trip, unless it’s coupled with a smoke/heat head to energize solenoid and dump the priming water. This is for coverage of areas you don’t want getting wet or having false trips at all costs. Once the air leak is detected the pipe can be repaired and you don’t damage any of the equipment that is being covered. If the system dumps on only one of these inputs alone it pretty much is defeating the purpose of the PreAc.

In order for a fire pump to start it has to sense a loss of pressure that the jockey pump is incapable of keeping up with that loss. If your static pressure is 100 psi. The jockey pump will be set to come on at around 90psi and the fire pump will be set to come on at 80-85 psi. Jockey pumps are maintenance pumps to keep the fire pump from coming on. So you must have caused a rapid loss of pressure in order to activate the fire pump. If you were filling a system back up good practice is to shut the fire pump off and fill with the jockey pump til it’s up to system pressure then turn the fire pump back on. And also good practice is to turn off your horns and strobes to fill the system. If for some reason your fire pump is wired for alarm instead of a supervisory then you need to get an alarm guy out there and have them fix that cause it should be wired for pump running supervisory not alarm.

Go to the pump control and switch to off

Meant to say it states pre action

I think this one shows more specifically how that works kzfaq.info/get/bejne/jK55daqBy5a5aYk.html

In double interlock. If sprinkler brust water will not get into the piping network.. Actually it requires electric detection signal to open the solenoid valve. Than only the preaction valve will open.. Hope i am right. If i am wrong, please advise the correct operation.

Agreed. There is a pneumatic actuator on the priming line and he didn’t even mention it.