TROUBLESHOOTING – SERIES 751 FIRELOCK EUROPEAN ALARM CHECK VALVE STATIONS
PROBLEM POSSIBLE CAUSE SOLUTION
The system water pressure gauge is uctuating with the supply
pressure.
The check valve in the bypass line is installed backward. Check the orientation of the bypass check valve. The arrow must point from
the supply side to the system side.
Debris is present in the bypass check valve. Remove the threaded cap to the check valve, and remove any debris. Make
sure the clapper is free to move.
Water is leaking from the intermediate chamber. Water is getting past the seal. Check the clapper seal and seat for physical damage. Make sure no debris is
present on the clapper seal and seat.
Make sure there is no vacuum in the alarm line. If a vacuum is present in the
alarm line, install the Series 752V Retard Vent Kit or create some means of
an air break in the alarm line.
The water motor alarm is not ringing or the ringing is weak. No water is going into the intermediate chamber. Make sure the holes in the seat ring are not plugged.
Water from the alarm line could be leaking out of the alarm line drain of
another valve.
Make sure there are check valves isolating the alarm line of each valve in
the system.
The wrong restrictor size is installed in the alarm line drain. Conrm that the proper restrictor size is installed in the alarm line drain. If
the proper restrictor size is not installed, refer to the trim drawing to replace
the restrictor with the correct size.
I-751.VDS / Series 751 FireLock
™
European Alarm Check Valve Stations / Installation, Maintenance, and Testing Manual
I-751.VDS_20 REV_F
To Next Page
Loading...
Need help?
General
