Specifications

20.
System Air Pressure Requirements
For Wet Pilot Single Interlock Preaction Systems and
Electric Actuation Single Interlock Preaction Systems, a
Reliable Model B-SI Air Compressor Panel or Reliable Mod-
el C-SI Air Compressor Panel can be used to maintain the
system air pressure at approximately 7 psi (0,5 bar). The
air compressor panels contain an integral low air pressure
warning light.
In some circumstances, such as when dry sprinklers are
being used in a preaction system, it may be desirable to su-
pervise the preaction system at air pressures higher than 7
psi (0,5 bar). For such cases, Reliable recommends the use
of a tank-mounted compressor and the Reliable Model A-2
Pressure Maintenance Device. Supervising pressure may
be between 7 psi and 20 psi (0,5 and 1,4 bar).
For Dry Pilot Line Single Interlock Preaction Systems,
a Reliable Model A-2 Pressure Maintenance Device can be
used to maintain the pneumatic pressure of both the Dry
Pilot Line of detectors and the fire sprinklers to the values
shown in Table A. The values listed in the table represent the
necessary ranges of pneumatic pressure required to keep
the Model LP Dry Pilot Line Actuator in the closed position
for a given water supply pressure.
Table A
Water Pressure
psi (bar)
Pneumatic Pressure to be
Pumped into Sprinkler System
psi (bar)
Maximum Not Less Than Not More Than
20 (1.4)
30 (2.1)
50 (3.4)
75 (5.2)
100 (6.9)
125 (8.6)
150 (10.3)
175 (12.1)
200 (13.8)
225 (15.5)
250 (17.2)
275 (19.0)
300 (20.7)
8 (0.6)
10 (0.7)
12 (0.8)
13 (0.9)
15 (1.0)
16 (1.1)
17 (1.2)
18 (1.2)
19 (1.3)
21 (1.4)
22 (1.5)
23 (1.6)
24 (1.7)
10 (.7)
14 (1.0)
16 (1.1)
17 (1.2)
19 (1.3)
20 (1.4)
21 (1.4)
22 (1.5)
23 (1.6)
25 (1.7)
26 (1.8)
27 (1.9)
28 (1.9)
Note: During system set-up, a higher pneumatic pres-
sure may be required in order to properly set the Model
LP Dry Pilot Line Actuator.
Whenever multiple systems area supplied by a common
air or nitrogen source, each system must have its own pres-
sure maintenance device for individual maintenance of
pressure (NFPA 13, 7.2.6.5).
System Electrical Requirements
When Using the Electric Actuation Single Interlock Preac-
tion System, all releasing, alarm and detection devices in
the Single Interlock Preaction System are supervised by
the Potter PFC-4410-RC Releasing Control Panel. Connect
these devices as shown in Fig. 9. The Releasing/ Control
Panel should be set to use Program #6 (See Potter Instruc-
tion Manual #5403550).
The power supply, the standby emergency power supply,
battery charger, and the rectifier circuitry are all contained
within the Potter PFC-4410-RC Releasing Control Panel. The
solenoid valve is operated and supervised by the Potter
PFC-4410-RC Releasing Control Panel. Potter PFC-4410-
RC Releasing Control Panel requires 120 VAC. Batteries that
provide ninety hours of standby power are required for Fac-
tory Mutual Approved systems.
Note:
In order for the solenoid valve to maintain Reliable’s war-
ranty it must remain sealed as it came from the factory. If
there are concerns about the valve’s internal components,
immediate replacement is recommended.
Standard Solenoid Valve Specifi cations:
Skinner Model 73218BN4UNLVN0C111C2
Rated working pressure: 175 psi (12,1 bar)
Voltage: 24 VDC
Power: 10 Watts
Current: 0.41 Amps Holding
Enclosure Coil: NEMA 4X
Pipe Size: ½” NPT Female
Cv Factor: 4.0
Alternate Solenoid Valve Specifi cations:
Skinner Model 73212BN4TNLVN0C322C2
Rated working pressure: 300 psi (20,7 bar)
Voltage: 24 VDC
Power: 22 Watts
Current: 0.83 Amps Holding
Enclosure Coil: NEMA 4X
Pipe Size: ½” NPT Female
Cv Factor: 2.8
Single Interlock Preaction Systems Engineering
Specifi cation
2” (50 mm), 2½” (65 mm), 76 mm, 3” (80 mm), 4” (100 mm),
165 mm, 6” (150 mm) and 8” (200 mm)
Model DDX Deluge Valve
Preaction System shall be a Single Interlock Preaction
System utilizing a [2” (50 mm)][2½” (65 mm)][76 mm] [3”
(80 mm)][4” (100 mm)][165 mm][6” (150 mm][8” (200 mm)]
[cULus Listed] [Factory Mutual Approved] hydraulically op-
erated, differential latching clapper type valve. Deluge valve
construction shall be of lightweight, ductile iron construction
with either a “screw in” stainless steel seat and clapper as-
sembly or drop in bronze seat and clapper assembly. Stain-
less steel or Bronze seat shall have O-ring seals to resist
leakage and corrosion. Clapper facing shall be pressure
actuated, providing a limited compression seat for the seal-
ing force between the clapper rubber facing and the valve
seat. Deluge valve shall have an external reset knob for
resetting the clapper without requiring the removal of the
valve face plate. Push-rod chamber design shall consist of
a stainless steel piston/ push-rod and spring assembly with
diaphragm seal secured to the casting through a push-rod
guide constructed of a synthetic engineering plastic to resist
corrosion. Casting shall have a bleeder hole located on the
pushrod chamber for air/water leakage indication. Trip ratio
shall be approximately a 3:1 force differential. Deluge valve
shall be of the straight through design to minimize friction