9.
Pneumatic Supervisory Pressure Supply Options
Owner’s Air supply
Supervisory air supply shall be provided by an owner sup-
plied air system in conjunction with a [cULus Listed] automatic
pressure maintenance device, capable of maintaining a con-
stant system pressure regardless of pressure fluctuations in the
compressed air source. The pressure maintenance device shall
consist of galvanized trim and brass parts, including a strainer
and a eld adjustable air pressure regulator, and have a working
pressure rating of 175 psi (12.1 bar). The pressure regulator
shall have an adjustable outlet pressure range of 5 to 100 psi
(0.34 to 6.8 bar). Pressure maintenance device shall be Reli-
able Model A.
Low Pressure Air Compressor Panel
Wet Pilot Line Single Interlock Preaction and Electric Actua-
tion Single Interlock Preaction system supervisory air supply
shall be a [cULus Listed] [FM Approved] self-contained, low
pressure air compressor panel containing a 1/16 hp air com-
pressor, DPDT relay for remote supervisory annunciation, low
pressure warning light, pressure gauge, and low pressure alarm
switch. Pressure switch shall control the compressor, providing
a maximum operating supervisory pressure of approximately
7 psi (0.5 bar), and a low-pressure supervisory alarm at ap-
proximately 4 psi (0.3 bar). Power requirements shall be 120
VAC/60 Hz or 220/230 VAC/50 HZ. Low Pressure Air Com-
pressor Panel shall be Reliable Model B-SI or C-SI (Reference
Reliable Technical Bulletin #252).
Compressed Air Supply
Supervisory air supply shall be provided by an automatic air
compressor sized for the capacity (volume) of the single inter-
lock preaction system piping, and be capable of restoring nor-
mal air pressure in the system within the time limits specied in
NFPA 13.
Dry Pilot Line Single Interlock Preaction systems desiring a
higher supervisory air pressure, shall only require between 8
and 28 psi (0.6 to 1.9 bar) supervisory pressure for proper set-
ting of the low pressure pneumatic actuator in accordance with
the manufacturer’s instructions. Air supply shall be equipped
with an automatic pressure maintenance device capable of
maintaining a constant system pressure regardless of pressure
fluctuations in the compressed air (or nitrogen) source, or sys-
tem piping. The pressure maintenance device shall consist of
galvanized trim and brass parts, including a strainer and a eld
adjustable air pressure regulator, or pressure switch, and have
a working pressure rating of 175 psi (12.1 bar). The pressure
regulator shall have an adjustable outlet pressure range of 5 to
100 psi (0.34 to 6.8 bar). Pressure maintenance device shall be
Reliable Model A. (Note: For small systems with air compres-
sors having a capacity less than 5.5 cfm @ 10 psi, a pressure
maintenance device is not required per NFPA 13. Consider-
ation should be given, however, to the impact of a direct air sup-
ply on the overall performance of the system.)
Nitrogen
Nitrogen cylinders provided by an approved source shall pro-
vide the nitrogen supply. Dry Pilot Line Single Interlock Preaction
System and Wet Pilot Ling Single Interlock or Electric Actuation
Single Interlock Preaction systems desiring a higher supervi-
sory air pressure, shall only require between 8 and 28 psi (0.6
to 1.9 bar) supervisory pressure for proper setting of the low
pressure pneumatic actuator in accordance with the manu-
facturer’s instructions. The nitrogen cylinder pressure shall be
regulated and supervised through the use of nitrogen regulat-
ing device and low-pressure trim kit. This device shall consist
of a brass, single stage pressure regulator, equipped with high
pressure inlet and low pressure outlet gauges, and ¼” copper
connection tubing with galvanized ¾” x ¼” reducer bushing.
Optional: Low-pressure trim kit shall be included to monitor the
regulated nitrogen supply pressure to provide a low-pressure
supervisory alarm. This kit shall include a low-pressure switch
with associated galvanized connection trim. Assembly shall be
a Reliable Nitrogen Regulating Device. This device is to be used
in conjunction with the Reliable Model A Pressure Maintenance
Device.
Optional System Accessories
System Control Valve
Preaction system control valve shall be a slow close, [cULus
Listed] indicating butterfly type valve with a pre-wired super-
visory tamper switch assembly. The valve shall be rated for a
working pressure of [300 psi (20.7 bar)]. System control valve
shall be for a [2” (50 mm)] Gruvlock AN7722-3A Butterfly Valve
or [2½” (65 mm)][3” (80 mm)][4” (100 mm)][6” (150 mm][8”
(200 mm] - Reliable BFG-300.
Detection System
To operate the solenoid valve on the electric actuation preac-
tion system, a supplemental electric detection system shall be
provided [Insert applicable product specication].
Releasing/Control Panel
A releasing/control panel shall be used to operate the pre-
action system. The releasing/control panel shall be a conven-
tional, microprocessor-controlled panel containing two initiating
device circuits, and waterflow and supervisory inputs. Output
circuits shall include alarm, waterflow, supervisory, and releas-
ing circuits. The releasing/control panel shall be capable of pro-
viding any of the following desired modes of operation: single
hazard, two zone; single hazard, cross-zoned; dual hazard,
combined release; and dual hazard, split release (two area).
Releasing/control panel shall be equipped with a local tone
alarm to annunciate loss of AC power, system trouble, circuit
trouble, and low auxiliary DC power supply. Panel shall be [cU-
Lus Listed] [FM Approved] and be capable of providing power
for compatible detectors and auxiliary devices used. Audible
alarms shall be able to be silenced at releasing panel. Auxiliary
DC power supply shall consist of (2) 12-volt lead acid batteries
of the same ampere-hour rating, providing [60 hours – cULus
Listed] [90 hours – FM Approved]. Dry contacts shall be pro-
vided for remote annunciation of alarm, trouble, and supervi-
sory panel signals. Main power supply to be a dedicated a 120
VAC / 60 Hz circuit.
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