Instruction manual

Single Interlock Preaction System– Electric
Release Trim Engineering Specifi cations
General Description
Preaction system shall be a single interlock preaction sys-
tem utilizing a [4” (100 mm)] [6” (150 mm)] [165mm] [cULus
Listed] [FM Approved] hydraulically operated, differential
latching clapper-type valve with electric release preaction
trim. Deluge valve shall be of lightweight, ductile-iron con-
struction with “drop in” bronze seat and clapper assembly.
Bronze seat shall have O-ring seals to resist corrosion and
leakage. Clapper facing shall be pressure actuated, provid-
ing a limited compression seat for the sealing force between
the clapper rubber facing and the valve seat. Push-rod
chamber shall be of a piston/push-rod design with dia-
phragm seal and have a ¼” vent hole for air/water leakage
indication. Trip ratio shall be a 3:1 force differential. Deluge
valve shall be of the straight-through design to minimize fric-
tion loss, and be capable of being reset without having to
remove the valve cover plate through the use of an external
reset knob. Inlet restriction orifice shall be factory installed
into inlet port of deluge valve push-rod cover plate and not
be a separate part of the deluge valve trim. Valve end con-
nections shall be grooved outlets per ANSI/AWWA C606.
Deluge valve shall have a rated working pressure of 250 psi
(17,2 bar). Deluge valve to be [4” (100 mm)] [6” (150 mm)]
[165mm] Reliable Model DDX Deluge Valve (Bulletin 511).
Preaction electric release trim shall consist of galvanized
and brass components specifically listed/approved with the
deluge valve. Deluge valve releasing device shall be an
electrical two-way, normally closed, pilot operated solenoid
valve [cULus Listed] [FM Approved] for its intended use.
The solenoid valve shall be constructed of a brass body with
stainless steel sleeve tube, springs, stop and plunger, and
with ½” female NPT end connections. Solenoid valve shall
have a maximum working pressure of [175 psi (12,1 bar)]
[250 psi (17,2 bar)] and maximum ambient temperature rat-
ing of 150°F (66°C). Power consumption of integrated coil
shall be limited to [10 watts (175 psi (12,1 bar)) Rated] [22
watts (250 psi (17,2 bar)) Rated] and require 24 VDC from
a releasing/control panel listed for such service. Solenoid
valve shall be a Skinner ½” normally-closed solenoid valve,
[Model 73218BN4UNLVNOC111C2 (175 psi (12,1 bar))
Rated]. [Model 73212BN4TNLVNOC322C2 (250 PSI (17,2
bar)) Rated].
Supervisory Air Supply Options
Owner’s Air supply
Single interlock preaction system air pressure shall utilize
low supervisory air pressure. Air supply shall be provided
by an owner supplied air system in conjunction with a [cU-
Lus Listed] [FM Approved] automatic low air pressure main-
tenance device. The pressure maintenance device trim as-
sembly shall consist of a field adjustable, low pressure line
regulator, air filter assembly, low air pressure switch, pres-
sure gauge and check valve. Regulator shall be capable
of receiving 40 to 100 psi (2,8 to 6,9 bar) inlet pressure and
provide approximately 2 psi (0,14 bar) outlet supervisory
pressure. The pressure switch shall have a SPDT contact
9.
rated at 15 amp @ 125/250 VAC, and 10 amp @ 12 VDC.
Pressure switch shall transfer contacts when the supervisory
pressure falls below approximately 0.5 psi (0,03 bar).
Low Pressure Air Compressor Panel
Preaction system supervisory air supply shall be a [cU-
Lus Listed] [FM Approved] self-contained, low pressure
air compressor panel containing a 1/16 hp air compressor,
DPDT relay for remote supervisory annunciation, low pres-
sure warning light, pressure gauge, and low pressure alarm
switch. Pressure switch shall control the compressor, pro-
viding a maximum operating supervisory pressure of 2 psi
(0,14 bar), and a low-pressure supervisory alarm at approxi-
mately 0.5 psi (0,03 bar). Power requirements shall be 120
VAC/60 Hz.
Optional System Accessories
System Control Valve
Preaction system control valve shall be a slow close, [cU-
Lus Listed] [FM Approved] indicating butterfly type valve
with a pre-wired supervisory tamper switch assembly. The
valve shall be rated for a working pressure of [175 psi (12,1
bar)] [250 psi (17,2 bar)]. System control valve shall be a
[4” (100 mm)] [6” (150 mm)] [165mm] Nibco GD-4765-8N
Butterfly Valve.
Detection System
To initiate actuation of the preaction system’s deluge valve,
a supplemental electric detection system shall be provided
[Insert applicable product specification]
Releasing/Control Panel
A releasing/control panel shall be used to operate the
preaction system. The releasing/control panel shall be a
conventional, microprocessor-controlled panel containing
two initiating device circuits, and waterflow and supervisory
inputs. Output circuits shall include alarm, waterflow, super-
visory, and releasing circuits. The releasing/control panel
shall be capable of providing any of the following desired
modes of operation: single hazard, two zone; single hazard,
cross-zoned; dual hazard, combined release; and dual haz-
ard, 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 [cULus 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 provided
for remote annunciation of alarm, trouble, and supervisory
panel signals. Main power supply to be a dedicated 120
VAC / 60Hz circuit.