Title: AV-1 alarm valve.pdf
If the water motor alarm and/or the pressure alarm switch provide an intermittent alarm, it is likely the conse- quence of an excessive amount of air being trapped within the sprinkler sys- tem. Drain down the sprinkler system and refill it using the steps described in the Setting Procedure section.A discontinuance of an alarm may also be caused by the Clapper closing due to a sudden drop in supply pressure or the shut-off of a pump in the supply line. These types of problems can only be corrected by maintaining a steady supply pressure.