Potter Releasing Systems - Manual (Page 15)

15
Fire Alarm Signals
A. Alarm: A signal indicating a fire emergency.
1. Automatic water flow device
2. Manual fire alarm station (pull station)
3. Automatic fire detectors (smoke or heat detectors)
B. Supervisory: A signal indicating an “off-normal” condition exists on the extinguishing system.
1. Control valve switch
2. High/low air pressure switch
3. Water tank level and temperature switches
4. Low water pressure for public water supplies
5. Low building temperature switch
6. Water Column Switch
C. Trouble: A signal indicating a problem with the fire control panel or associated wiring which may
render the system inoperable.
1. Loss of primary power (120VAC)
2. Loss of secondary power (battery)
3. A defect in the supervised wiring to an initiating device, indicating appliance or extinguishing
agent release device.
4. Disabled circuit or function
5. Failure to communicate with central station
Types Of Sprinkler Systems
Wet Pipe Sprinkler System
Wet systems are the most common and reliable sprinkler systems since no equipment other than the sprinkler
heads are required to operate. Wet systems use automatic sprinkler heads attached to piping containing water
and connected to a water supply so that water will be discharged immediately from an open sprinkler. Water will
only be discharged through heads that have opened due to fire.
Dry Pipe Sprinkler System
Dry pipe systems use automatic sprinklers attached to a piping system pressurized with air. These systems use
a dry pipe valve and air pressure to hold back the water supply. When the air pressure in the system bleeds
off due to an open sprinkler, the water pressure will open the valve and fill the system. The water will only
be discharged through the heads that have opened due to fire. Dry systems are usually installed in unheated
buildings or where there is the possibility of sprinkler pipes freezing.