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The check valves, for the sensor, may be mounted two ways.
The one pictured
below is the simplest and will normally provide correct system operations,
If
system instability occurs (after checking in Troubleshooting Table 6-1, page
6-5 under "Pressure not stable under steady demand" steps) perform the following:
1,' Remove power -from the system, close the sensor shut-off valves and remove
the sensor check valves.
2.
Drin
a
r/16
inch hole in the clapper of the check valves.
3.
Re-install check valves so gravity will close clapper.
4.
Open-shut-off valves and test system.
INLET
DUPLEX
NOTE
PRESSURE GAGE OR
SWITCHES SHOULD
NOT BE MOUNTED IN
PRESS SENSOR LINE.
PRESSURE
SENSOR
,..---SHUT-OFF
INCH
SENSOR
~
.....
~PUIM""P'
CHECK VALVES
MOUNT SO GRAVITY
WILL OPEN
INLET
SENSOR
INSTALLATION
FIGURE 3-1
3-4
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