section_3_preaction_special_systems

The Reliable Automatic Sprinkler Co., Inc., 525 North MacQuesten Parkway, Mount Vernon, New York 1055201/01

3. PREACTION (SPE CIAL) SYS TEMS

3.1 General Description A preaction system employs closed sprinklers and is used to provide fire protection primarily in watersensitive environments where serious water damage would otherwise occur, as a result of a brokensprinkler or broken sprinkler piping. Preaction systems, during normal conditions, contain no water inthe sprinkler piping. However, they may contain air at atmospheric pressure (i.e., unsupervisedsystems), or a slightly compressed gas (air or dry nitrogen) for the purpose of supervising the leaktightness of a sprinkler system. Usually, supervising of sprinkler piping is done at a pressure of 1 to 2psi (0,1 bar); however, some types of preaction systems require supervising at pressure levels between 15 and 50 psi (1,0 and 3,5 bar). For example, when using RELIABLE Model G3 dry sprinklers, whichrequire nearly 7 psi (0,5 bar) of opening pressure, system supervising should employ a pneumaticpressure of approximately 15 psi (1,0 bar). Also, a pneumatic preaction system using a Model A DryPilot Actuator releasing device may require up to 50 psi (3,5 bar) of supervising pressure. Preaction systems differ from dry pipe systems in that the primary control valve for preaction isactivated by a fire detection device, and not by exclusive operation of a sprinkler head in the systempiping, as is the case when a dry pipe valve is the primary control valve. When a fire is detected by a preaction system, the primary control valve is opened to allow water flowinto the sprinkler piping in readiness for possible subsequent opening of one or more sprinklers, in theevent the fire cannot be extinguished by hand-held means. With the flow of water into the sprinklersystem piping, alarm devices are activated. This type of system is often referred to as aSINGLE-INTERLOCK PREACTION SYSTEM, and it is used to provide fire protection in computerrooms, libraries, museums, and telephone equipment rooms. When local codes permit and FactoryMutual Approval is not required, it may be desirable to arrange electrical detectors in a cross-zonedarray. This arrangement (see Section 1.4.1.2) will prevent a false activation of one detector fromcausing water to flow into the sprinkler piping prematurely since two detectors must operate beforewater will flow. Certain design conditions may exist which require that a system be arranged as aDOUBLE-INTERLOCK PREACTION SYSTEM. A large refrigerated storage area, where temperaturesare below freezing, is an example. Double-interlock systems can also be used in museums andelectronic equipment rooms. In contrast to single-interlocking, double interlocking prevents flow ofwater into a sprinkler system, until both a detecting device and a sprinkler head are operatedsimultaneously. Operation of either a detector or a sprinkler will produce an alarm, but is insufficient toproduce water flow into the system. When freezing refrigerated systems are protected by a preactionsystem, double-interlocking assures that once water flows into the system, it will continue to flowthrough one or more open sprinklers. This minimizes the possibility of ice blockage which could occurwith a single-interlock system that holds the water statically until a sprinkler operates.

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The Fire Protection Handbook, published by the National Fire Protection Association (NFPA), contains acomprehensive description of preaction systems. The water supply to each preaction system is controlled by a primary control valve which is usually adeluge valve. Deluge valves manufactured by RELIABLE are described in Section 1.1.1 and 1.1.2. Onoccasion, a dry pipe valve (see Section 1.1.3) may be used as the primary control valve for aNON-INTERLOCK PREACTION SYSTEM. With this arrangement, a detector operating first will causewater to flow into the sprinkler piping in readiness for the operation of a sprinkler (just like asingle-interlock system). However, whenever a sprinkler head operates first, this system will respond as a dry pipe system with water flow from the sprinkler within 60 seconds. More information on this type ofcombined dry pipe preaction system is provided in Section 3.3.1.

3.2 Hydraulic (Wet Pilot) Activation3.2.1 Single-Interlock Type Wet pilot line operation is the simplest and least costly method for arranging a preaction system. Theclosed, quick response sprinklers in the pilot line serve as heat detectors over the area to be protected.The pilot line contains water at the same pressure as the water in the top chamber or push rod chamberof RELIABLE Deluge Valves (see Figures 1 or 2). Pilot line sprinklers function as both thermal detectorsand releasing devices, and when one or more operate, the resulting water discharge and pressure lossin the chamber of the deluge valve causes it to open and allow water flow into the sprinkler systempiping. The sprinkler system is now in readiness for conditions that cause a sprinkler head to open andimmediately discharge water on the fire. Note that water discharge from a pilot line sprinklercontributes little toward fire control. When quick response sprinkler heads are used, quick responsepilot heads should have a lower temperature rating. Manual emergency pull stations (see Section 1.2.4.1) can provide a remote hydraulic method ofcausing water flow into the sprinkler piping when visual indications of fire precede thermal indications. A wet pilot line installation is subject to the following restrictions:

a) It is not to be installed in an area subject to freezing.

b) It is not to be installed in an area where temperatures in excess of 150°F (66°C) are anticipated.

c) NFPA Pamphlet No. 13, or the Authority Having Jurisdiction, should be consultedfor pilot sprinkler spacing requirements.

d) It is to be installed in accordance with the following table. See the Appendix Section 4.1for the combination of height and distance limitations

The Reliable Automatic Sprinkler Co., Inc., 525 North MacQuesten Parkway, Mount Vernon, New York 10552

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The trimmings for Model A, B, and BX Deluge Valves are arranged for rapid, compact attachment, andserve as connection points to alarm and other devices.

All RELIABLE Deluge Valves are listed and approved by Underwriters Laboratories, Inc., and FactoryMutual Research Corp. when used with the above trim sets. Supervision of a hydraulic preaction system may not be required. However, when supervision isrequired, a riser check valve must be installed on the system side of the deluge valve to prevent thesupervising pressurized gas (air or dry nitrogen) from escaping through the alarm line of the delugevalve. A riser check valve is not required, when supervision of the system is not necessary. Supervising pressure provided by a RELIABLE Model B or C Compressor Panel (see Section 1.4.2.2.1) or a ModelC Pressure Maintenance Device (see Section 1.4.2.2.2) requires the check valve to be capable ofleak-tight sealing for a pressure of 2.0 psi (30 to 40 oz/in2 (0,15 bar)).

This system is not shown in detail because of its limited use. To order this system, use thewet deluge system. If supervised, you must add a check valve and supervisory airequipment.


Average SupplyPressure At Valve

Maximum Height of Wet Pilot Line Above Deluge ValveFeet (Meters)

psi bar 2½″ (65mm) 4″ (100mm) 6″ (150mm)

20 1,4 7.7 (2.3) 7.7 (2.3) 10.8 (3.3)

40 2,8 12.3 (3.8) 18.4 (5.6) 21.5 (6.6)

60 4,2 21.6 (6.6) 27.8 (8.5) 32.3 (9.8)

80 5,6 30.8 (9.4) 37.0 (11.3) 43.1 (13.1)

100 7,0 43.1 (13.1) 44.6 (13.6) 50.8 (15.5)

120 8,4 53.9 (16.4) 52.4 (15.9) 58.5 (17.8)

140 9,8 67.8 (20.7) 66.2 (20.2) 75.5 (23.0)

160 11,3 80.1 (24.4) 78.5 (23.9) 81.6 (24.9)

175 12,1 92.4 (28.2) 84.6 (25.8) 84.7 (25.8)

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3.3 Pneumatic (Dry Pilot) Activation 3.3.1 Non-Interlock Type Dry pilot line operation of this type is theleast costly pneumatic preaction system.This non-interlock system will respond asa true preaction system whenever a pilotline quick response sprinkler (heatdetector) operates before a systemsprinkler. However, if a system sprinklershould operate first, then the system willrespond exactly like a dry pipe system.When a sprinkler head operates, as theresult of being damaged, the inherentsafeguarding provided by a preactionsystem against accidental waterdischarge does not exist with this system.When water damage, due to accidentaldischarge would be a negligible factor,this preaction system can be quite costeffective.

Pilot line pressure is maintained at a level somewhere between 20 and 50 psi (1,4 and 3,5 bar), and issimultaneously the pressure in the sprinkler system piping. A Model A Compressor (see Bulletin 275for proper sizing) and Model B-1 Pressure Maintenance Device should be used to provide this level ofpressure. If a compressed air system is constantly available on the site, than a Model A-2 PressureMaintenance Device (see Section 1.4.2.1.2 for maintenance device information) should be used tosimultaneously supply the pilot line and sprinkler piping. Maintaining pneumatic pressure, according to Table 1, will hold a RELIABLE Dry Pipe Valve (primarycontrol valve) closed (see Section 1.1.3). This same level of pressure will also hold a Model A Dry PilotActuator releasing device (see Section 1.2.2) closed, preventing system pressure from entering theintermediate chamber of the dry pipe valve. When one or more pilot heads open, due to fire conditi ons, the loss of pilot line pressure allows the dry pilot actuator to open. This sufficiently pressurizes theintermediate chamber of the dry pipe valve causing it to release and flow water into the sprinklersystem. Subsequent opening of one or more sprinkler heads will soon result in water flow on the fire.


Figure 1 Model A Dry Pipe Valve - Model A Trimmings

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Model A Manual Emergency Pull Stations (see Section 1.2.4.1) can be incorporated into the dry pilotline, and they should be piped so that discharging pneumatic pressure is directed away from theperson that operated the station. Pneumatic supervision of sprinkler piping leak tightness in anon-interlock preaction system is accomplished by employing a low pressure switch to activate atrouble annunciating device when pilot line pressure falls below a predetermined level. Ignoring thiswarning can result in a significant loss of pneumatic pressure which will open the primary control (drypipe) valve to flow water into the system. Models A and D Dry Pipe Valves require a basic trim set for convenient and compact connectionpoints to alarm and other devices. Basic Trim Sets (Figures 1 & 2) provide a main drain connection,alarm devices connection, alarm test connection, and gauges for water supply and pneumaticpressures.


Figure 2 Model D Dry Pipe Valve - Model D Basic Trimming

Water PressureIn Supply Line, psi (bar)

Pneumatic Pressure to be Pumped Into System, psi (bar)

Maximum Not Less Than Not More Than

20 (1,7) 10 (0,7) 20 (1,4)

50 (3,5) 15 (1,0) 25 (1,7)

75 (5,1) 20 (1,4) 30 (2,1)

100 (7,0) 25 (1,7) 35 (2,4)

125 (8,6) 30 (2,1) 40 (2,8)

150 (10,3) 35 (2,4) 45 (3,1)

175 (12,1) 40 (2,8) 50 (3,5)

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Preaction SystemPneumatic (Dry Pilot) Activation

Non-Interlock Type

Design Specifications&

Ordering Information

(1)System Equipment Manufacturers

(A) Notifier, Division of Pitway Corp.(B) Fenwal Inc., Division of W. Kidde & Co., Inc.(C) Skinner Valve Division, Parker Hannifin Corp.(D) The Reliable Automatic Sprinkler Co., Inc.

(E) United Electric Controls Co.(F) Meggitt Avionics(G) System Sensor, Division of Pitway Corp.(H) Thermotech, Inc.

ITEMNo. COMPONENT PART (1) DESCRIPTION

1 Isolating Valve OS&Y or Butterfly Type

7 Water Flow Pressure Switch(Optional)

G Model EPS 10-1 (SPDT)Model EPS 10-2 (DPDT)

8 Mechanical Alarm (Optional) D Mod. C (Bulletin 612 & 613)

15 Sprinklers D Closed Type(Bulletin 110, 117, 131, 136, etc.)

16 Manual Emergency Station(Optional)

D Mod. AHydraulic (Pilot Line) Type

18 Air Compressor I Mod. A, 13, 3

4, 112 hp (Bulletin 275)

19 Pressure Maintenance Device D Mod. B-1, Use with Item No. 18(Bulletin 251)

Mod. A-2, Use with N2 or Owner’s Air Supply(Bulletin 251)

21 Dry Pipe Valve D Mod. A, 2½″ THD x THD or GRV x GRV

Mod. D, 4″ or 6″ FLNG x FLNG or FLNG x GRV

22 Basic Trim Set(Dry Pipe Valve)

D Mod. A, (Bulletin 353)Mod. D, (Bulletin 350)

25 Low Pressure Switch(10-100 psi)

G Model EPS 40-1(SPDT)

26 Air Pressure Gauge D Mod. UA 0-250 psi (Bulletin 206)

28 Dry Pilot Actuator D Mod. A (Bulletin 504)

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(I) Gast Manufacturing, Inc.

3.3.2 Single-Interlock Type Dry pilot single-interlock preaction systems contain several components that differ from those innon-interlock systems. These add to the cost of a preaction system; however, they do providedesirable features described below.

The primary control valve is a deluge valveinstead of a dry pipe valve, as employed inthe non-interlock system (see Section3.3.1). The operating characteristics ofRELIABLE Deluge Valves are discussed inSection 1.1.1 (2 ½″ Model A) and Section1.1.2 (4″ & 6″ Model B & BX). Sprinkler piping in single-interlock systemscan be effectively supervised by using thesame air supply required for pressurizationof the dry pilot actuator (See Section1.4.2.1). Loss of the supervising pneumaticpressure, due to a damaged sprinkler or pipeline, will not cause water flow through a delugevalve and into the system piping. It will,however, produce a trouble conditionannunciation.

A dry pilot line of closed sprinklers (thermaldetectors) is located over an area to beprotected, and is pressurized withcompressed gas, such as air or drynitrogen. This pressurized pilot line isconnected to a Model A Dry Pilot Actuatorreleasing device (see Section 1.2.2), whichfunctions like a small dry pipe valve. Whilethe pilot line is pressurized adequately, theactuator remains closed keeping sufficientwater pressure in the top chamber or pushrod chamber of a RELIABLE Deluge Valve(see Figure 1 or 2) to keep it closed. When a pilot line sprinkler operates, thepneumatic pressure is reduced until theactuator is no longer able to hold waterpressure in the top chamber or push rodchamber. The deluge valve is thenreleased to open and flow water into thesprinkler system. A dry pilot line is only forthermal detection purposes.

Figure 1 Model A Deluge Valve with Single-Interlock Preaction, Dry Pilot Line Trim

Figure 2 Model BX Deluge Valve withSingle-Interlock Preaction,

Dry Pilot Line Trim

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It will not discharge water from any of its opened sprinklers. Model A Manual Emergency Pull Stations(see Section 1.2.4.1) can be incorporated into the dry pilot line, and they should be piped so thatdischarging pneumatic pressure is directed away from the person operating the station. It is veryimportant that suitable automatic pressure maintenance equipment (see Section 1.4.2.1) be used tosafeguard against accidental deluge valve operation due to possible pressure leakage in the dry pilotline. The dry pilot line trim set, required when pneumatically activating a RELIABLE Model A, B, or BXDeluge Valve, includes a Model A Dry Pilot Actuator releasing device and a low pressure switch forsupervision purposes. This switch is factory set to activate a warning annunciator whenever pressurefalls below 25 psi (1,7 bar). The switch can be adjusted to other pressure levels, if required. Appropriate pneumatic pressures for dry pilot lines used with RELIABLE Deluge Valves are given bythe following table:

When Model G3 or G3FR Dry Sprinklers are used, a minimum of 15 psi (1.0 bar) pneumatic pressureshould be used.


Water Pressure, psi (bar) Pneumatic Pressure to be Pumped into Dry Pilot Line, psi (bar)


20 (1,7) 10 (0,7) 20 (1,4)

50 (3,5) 15 (1,0) 25 (1,7)

75 (5,1) 20 (1,4) 30 (2,1)

100 (7,0) 25 (1,7) 35 (2,4)

125 (8,6) 30 (2,1) 40 (2,8)

150 (10,3) 35 (2,4) 45 (3,1)

175 (12,1) 40 (2,8) 50 (3,5)

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70

Model B/BX 4″ & 6″

Model A - 2½″



Preaction SystemPneumatic (Dry Pilot) Activation

Single - Interlock Type








2 Deluge Valve D Mod. A, 2½″ THD x THD or GRV x GRV

Mod. B, 4″ or 6″ FLNG x FLNG or FLNG x GRV

Mod. BX, 4″ or 6″ FLNG x FLNG or FLNG xGRV

4 Preaction TrimSingle-Interlock Dry Pilot

D Mod. A Mod. B & BX

6 Drain Manifold (Optional) D 2½″ Preaction or 4″/ 6″ Preaction


G Mod. EPS 10-1 (SPDT)Mod. EPS 10-2 (DPDT)


15 Sprinklers D Closed Type(Bulletin 110, 117, 131, 136, etc.)



18 Air Compressor D Mod. A, 13, ¾, 1½ hp (Bulletin 275)

D Mod. A, 16 hp (Bulletin 707, Section 1.4.2)

19 Pressure MaintenanceDevice

D Mod. B-1, Use with Item No. 18(Bulletin 251)


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3.4 Electric Activation (Supertrol System) Electric activation of a primary control valve requires heat, smoke, or flame detectors (see Sections1.3.2, 1.3.3, and 1.3.4), which communicate electrically with an electrical releasing control panel (seeSection 1.4.1). Electrically activated preaction systems are generally more costly than hydraulic andpneumatic systems. However, electrical systems offer the greatest number of features, designflexibility, speed of operation, and ability to interface with other building services systems. When the detection section of an electrical preaction system senses the presence of fire, an electricalsignal to the releasing control panel immediately activates an alarm bell circuit and energizes open anormally closed solenoid releasing valve (see Section 1.2.3). The releasing control panel willelectrically latch a solenoid releasing valve in the open position, and resetting it closed can only beaccomplished by operating a resetting switch in the panel, after all detectors and electrical manualemergency pull stations have been reset. Manual emergency pull stations (see Section 1.2.4.2) are incorporated electrically into detectorcircuits. The single pole, Model BNG-1 is normally used; however, when a releasing control panel isarranged with the briefly delaying characteristic of cross-zoned operation (see Section1.4.1.2), thenthe two-pole, Model BNG-1F station is required. The two-pole station enables activation of bothdetector circuits simultaneously; circumventing the delaying characteristic by causing immediatewater flow into the system when fire is visually observed. A releasing panel must have the capacity to supervise constantly the power supply, detector, alarmbell, and solenoid releasing valve electrical circuits; and to provide visual and audible troubleannunciation whenever electrical faults occur in these circuits. Releasing control panels accept both Class A and Class B detector circuit wiring. Class A wiring,required by Factory Mutual, uses two (2) wires to each detector, and two (2) wires returning to thepanel. With Class A wiring, a control panel will sound and display trouble signals, and simultaneouslyoperate an alarm bell and solenoid releasing valve while single and some multiple unrepaired wiringfaults exist. Class B detector circuit wiring uses two (2) wires to each detector and an end-of-line resistor. WithClass B wiring, the control panel will sound and display trouble signals, but may not operate an alarmbell and solenoid releasing valve while an unrepaired wiring fault exists.See page 53 for illustrations of Class A and Class B Wiring.


In the event of a primary (120/230VAC) power failure, a control panel will automatically switch to battery power. Batteries are available to supply adequate power to operate the detection, signaling andreleasing components, as required, for a minimum of 60 hours UL and 90 hours FM. Control panelsinclude a charging circuit which constantly maintains gel cell batteries at full charge.

3.4.1 Non-Interlock Type This non-interlock system will respond as a true preaction system whenever an electrical detectoroperates before a system sprinkler head does. However, if a system sprinkler should operate first, then the system will respond exactly like a dry pipe system. When a sprinkler head operates, as the result ofbeing damaged, the inherent safeguarding associated with the preaction systems against accidentalwater discharge does not exist with this system. When accidental discharge of water from a sprinklerhead would be a negligible factor, this type of preaction system is the most cost effective of the variouselectrical systems.Maintaining pneumatic pressure, according to the Table below, will hold a RELIABLE Dry Pipe Valve(Primary Control Valve) closed (see Section 1.1.3).A Model A Compressor (see Bulletin 275 for proper sizing) and Model B-1 Pressure MaintenanceDevice should be used to provide a proper level of pressure. If a compressed air system is constantlyavailable on the site, then a Model A-2 Pressure Maintenance Device (see Section 1.4.2.1.2 formaintenance device information) should be used to supply the sprinkler piping.

Water PressureIn Supply Line, psi (bar)

Pneumatic Pressure to be Pumped Into System, psi (bar)


20 (1,7) 10 (0,7) 20 (1,4)

50 (3,5) 15 (1,0) 25 (1,7)

75 (5,1) 20 (1,4) 30 (2,1)

100 (7,0) 25 (1,7) 35 (2,4)

125 (8,6) 30 (2,1) 40 (2,8)

150 (10,3) 35 (2,4) 45 (3,1)

175 (12,1) 40 (2,8) 50 (3,5)

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When Model G3 or G3FR Dry Sprin klers are used, a min i mum of 15 psi (1,0 bar) pneu maticpres sure should be used.

When one (1) electrical detector senses thepresence of fire, the electrical releasing controlpanel latches the solenoid releasing valve in the open position. (Note that arranging detectors ina cross-zoned pattern will require operation oftwo (2) detectors before the solenoid valve canopen.) This pneumatically pressurizes theintermediate chamber of the dry pipe valvecausing it to release and flow water into thesprinkler system. Subsequent opening of one(1) or more sprinkler heads will soon result inwater flow on the fire.A Model A Manual Emergency Pull Station (seeSection 1.2.4.1) can be incorporated into theline supplying air pressure to the solenoid valve. This pull station should be piped so thatdischarging pneumatic pressure is directedaway from the person that operated the station.

Model BNG Electrical Manual EmergencyStations (see Section 1.2.4.2) are incorporated into the detector circuit(s). Pneumatic supervision of sprinkler piping leak tightness in a non-interlock preaction system isaccomplished by employing a low pressure switch to activate a trouble annunciating device, when systempressure falls below a predetermined level that is considerably higher than the normal dry pipe valvereleasing (tripping) pressure. Ignoring this annunciating device can result in further pneumatic pressuredecrease leading to unintentional releasing (opening) of the dry pipe valve. Models A and D Dry PipeValves require a basic trim set for convenient and compact connection points to alarm and other devices.Basic trim sets (Figures 1 & 2) provide a main drain connection, alarm devices connection, alarm testconnection, and gauges for water supply and pneumatic pressures.


Figure 2 Model D Dry Pipe Valve - Model D Basic Trimmings

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Figure 1 Model A Dry Pipe Valve - Model A Trimmings

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Preaction SystemElectrical ActivationNon-Interlock Type











9 Solenoid Releasing Valve C Mod. 73218BN4UNLVNOC111C2 24VDC(Normally Closed)

10 Releasing Control Panel(Optional)

A Mod. RP-1001

Batteries (2 Required) A Mod. PS 12120 (90 Hrs. Back-up) (FM)

Mod. PS 1270 (60 Hrs. Back-up)

Optional Accessories A Mod. 4XTM Transmitter Module

Mod. 4XLM Annun. Driv. Module

Mod. RZA-4X Remote Annun.

Mod. 4XZM Zone Relay Module

11 Alarm Annunciator (Optional) G Mod. SSM-24-8-24VDC / Polarized Bell

Mod. SSM-24-10-24VDC / Polarized Bell

Mod. H 12/24-24VDC / Polarized Horn

Mod. P2415-24VDC / Polarized Horn Strobe

12 Trouble Annunciator G Mod. SSM-24-6-24VDC / Polarized Bell



A Mod. BNG-1 (SPDT)1 & 2 Area Detection

Mod. BNG-1F (DPDT) Cross Zone Detection

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(Future)

Preaction SystemElectrical ActivationNon-Interlock Type







14 Detectors (Optional)

Thermal H Mod. 302 Pendent / Interior, 135°F, 200°F

Thermal Mod. 302H Horizontal / Interior, 135°F, 200°F

Thermal Mod. 302AW Pendent / All Weather, 135°F, 200°F

Adapter Mod. AP-P Adapter Plate (Mod. 302 Only)

Smoke B Mod. PSD7155 Photoelectric

Smoke Mod. CPD7051 Ionization

Base (Required with PSD &CPD Detectors)

B Mod. 70-201000-001Base (2-Wire)



18 Air Compressor D Mod. A, 13, 3

4, 1 12 hp (Bulletin 275)

D Mod. A, 16 hp (Bulletin 707, Section 1.4.2)

19 Pressure MaintenanceDevice

D Mod. B-1, Use with Item No. 18(Bulletin 251)


21 Dry Pipe Valve D Mod. A, 2½″ THD x THD or GRV x GRV

Mod. D 4″ or 6″ FLNG x FLNG or FLNG x GRV

22 Basic Trim Set(Dry Pipe Valve)

D Mod. A (Bulletin 353)Mod. D (Bulletin 350)

23 Accelerator (Optional) D Mod. B1 (Bulletin 320 & 322)

25 Low Pressure Switch (10-100 psi) G Mod. EPS 40-1 (SPDT)

26 Air Pressure Gauge D Mod. UA 0-250 psi (Bulletin 206)

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3.4.2 Single-Interlock Type Supertrol Systems Electric single-interlock preaction systems contain several components that differ from those innon-interlock systems. These add to the cost of a preaction system; however, they do provide desirable features described below.

The primary control valve is a deluge valve instead of a dry pipe valve, as employed in the non-interlock system (see Section 3.4.1). The operating characteristics of RELIABLE Deluge Valves are discussedin Section 1.1.1 (2½″ (65mm) Model A) and Section 1.1.2 (4″ & 6″ (100mm and 150mm) Model B &BX).

Sprinkler piping in single-interlock systems can be effectively supervised by means of a Model B or CAir Compressor Panel or a Model C Pressure Maintenance Device (see Section 1.4.2.2). Loss of the2.0 psi (0,14 bar) supervising pneumatic pressure, due to a damaged sprinkler or pipe line, will notcause water flow through a deluge valve and into the system piping. A significant loss of pneumaticpressure will activate a trouble annunciating device when system pressure falls below 7 psi (0,5 bar).

When one (1) electrical detector senses the presence of fire, the electrical releasing control panelactivates fire alarm devices and latches the solenoid releasing valve in the open position. (Note thatarranging detectors in a cross-zoned pattern will require operation of two (2) detectors before thesolenoid valve can open.) The solenoid releasing valve (Figures 1 & 2), when closed, is preservingsufficient water pressure in the top chamber or push rod chamber of a RELIABLE Deluge Valve to holdit closed. Opening the solenoid release valve relieves that water pressure, and thereby opens thedeluge valve to allow water flow in the sprinkler system. To fully operate a cross-zoned , single-interlock system, two (2) electrical detectors must activat e, anda sprinkler head must open. The operating sequence of a cross-zoned system follows. During theinitial stages of a fire, smoke or heat activates the first detector which causes the panel to produce alocal alarm and an alarm at the main fire alarm panel. Electrical relays inside the releasing cont rol panel can be used to shut down air moving equipment and computer systems or activate security doors andother electrical devices, when the panel goes into this “first alarm” condition. Subsequent activation ofa second, nearby (adjacent) detector will cause the panel to energize the solenoid valve open andrelease pressure in the top or push rod chamber of the deluge valve which causes the clapper tounlatch. This immediately sends water into the sprinkler piping.


Figure 1 Model BX Deluge Valve with Electrical Actuation Preaction Trim

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Water flowing into the sprinkler piping willsimultaneously produce water pressure in thealarm trim piping of the deluge valve, acondition that causes the transfer of drycontacts in one or more pressure switchesmounted in this alarm line. Each pressureswitch can electrically control the shutdown orstart-up of equipment, such as, computers orother “second alarm” devices, respectively.The flow of water into the sprinkler pipingeffectively converts the heretofore dry systeminto a wet pipe system. In the event the firesubsequently produces sufficient heat tooperate a sprinkler head, water will flow fromthat sprinkler on the fire.The major benefits of a single-interlockpreaction system, when compared with a wet-pipe system, are as follows:

A. A fire alarm sounds prior to the operation of a sprinkler which may enableextinguishing the fire by hand-held means before the operation of any sprinkler headoccurs.

B. A trouble annunciator signals whenever the integrity of piping or sprinklers isaccidentally or intentionally disturbed; however, no water flow or water damage willresult at this time.

C. Speedy detection and an early fire alarm is provided by fire detectors, without thedelay of water delivery time, in the event of a fire. Note that with a wet-pipe system,the fire alarm is produced only after water has begun flowing from an operatedsprinkler head.


Figure 2 Model A Deluge Valve with Electrical Actuation Preaction Trim

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Model B/ BX 4″ & 6″

Model A 2½″

* When Model G3 or G3FR Dry Sprin klers are used (Ref. Sec tion 3.1) or when su per vi sorypres sures above 15 psi are pre ferred, sub sti tute the Model A-2 Pres sure Main te nance De vice

(Item 19) and the Low Pres sure Switch (Item 25) for Item 17.

84


Preaction SystemElectrical Activation






(E) United Electric Controls, Co.(F) Meggitt Avionics(G) System Sensor, Division of Pitway Corp.(H) Thermotech, Inc.



2 Deluge Valve D Mod. A, 2½″ THD x THD or GRV x GRV


Mod. BX, 4″ or 6″ FLNG x FLNG or FLNG x GRV

4 Preaction TrimSingle-Interlock - Electric

D Mod. A (Bulletin 715)Mod. B&BX (Bulletin 716)

6 Drain Manifold (Optional) D 2½″ Preaction or 4″/6″ Preaction





A Mod. RP-1001


Mod. PS 1270 (60 Hrs Back-up)




Mod. 4XZM Zone Module

11 Alarm Annunciator (Optional) G Mod. SSM-24-8-24VDC / Polarized Bell



Mod. P2415-24VDC / Polarized Horn/Strobe











12 Trouble Annunciator(Optional) G Mod. SSM-24-6-24VDC / Polarized Bell

Mod. P2415-24VDC / Polarized Sounder












B Mod. 70-201000-001Base (2-Wire)

15 Sprinklers D Closed Type (Bulletins 110, 117, 131, 136, etc.)

17 Supervisory PressureSupply (Optional)

D Mod. B Air Compressor Panel 120 VAC / 60HZ

Mod. C Air Compressor Panel 220 VAC / 50HZ

Mod. C Pressure maintenance Device requires 40to 100 psi Supply

19 Pressure MaintenanceDevice (Optional)

D Mod. B-1 (Bulletin 251)

20 Air Compressor withTank

I Mod. 1 HAB-11T-M100X, 16 hp 2 Gal. Tank

25 Low Pressure Switch(10-100psi) (Optional)

G Mod. EPS 40-1 (SPDT)

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86


1½″ Preaction SystemElectrical Activation

Single-Interlock Type



(1)System Equipment Manufacturers(A) Notifier, Division of Pitway Corp.(B) Fenwal Inc., Division of W. Kidde & Co., Inc.(C) Skinner Valve Division, Parker Hannifin Corp.(D) The Reliable Automatic Sprinkler Co., Inc.



2 Deluge Riser Assembly D/C Model H 1½″ Thd x Thd (Bulletin 507)

4 Preaction TrimSingle-Interlock-Electric D Model H (Bulletin 719)


A Model RP-1001

Batteries (2 Required) A Model PS 12120 (90 Hrs. Back-up) (FM)

Model PS 1270 (60 Hrs. Back-up)

Optional Accessories A Model 4XTM Transmitter Module

Model 4XLM Annunciator Driv. Module

Model RZA-4X Remote Annunciator

Model 4XZM Zone Module

11 Alarm Annunciator (Optional) G Model SSM-24-8-24VDC/Polarized Bell

Model SSM-24-10-24VDC/Polarized Bell


87


1½″ Preaction SystemElectrical Activation








12 Trouble Annunciator(Optional)

G Mod. SSM-24-6-24VDC / Polarized Bell













B Mod. 70-201000-001Base (2-Wire)


17 Supervisory PressureSupply (Optional)

D Mod. B Air Compressor Panel 120 VAC / 60HZ

Mod. C Air Compressor Panel 220 VAC / 50HZ

Mod. C Pressure Maintenance Device requires 40to 100 psi Supply

20 Air Compressor with Tank(Optional) I Mod. 1 HAB-11T-M100X, 1

6 hp 2 Gal. Tank(Use with Mod. C Pressure Maintenance Device)


The Re li able Au to matic Sprin kler Co., Inc. 525 North MacQuesten Park way, Mount Vernon New York 10552

88

3.4.2.1 PrePaK Sys temsThe Reliable PrePaK Preaction Systems are completely self-contained supervised preaction systemsfor UL Applications that can be readily installed within a floor space of 4 or 7.5 square feet (0.37 or0.7m2). Installation for the PrePaK (not including exterior devices, i.e., detectors and alarm bells)requires just three piping connections: a supply line, a system line, and a drain line. Locations of thesepiping connections are shown in Reliable Bulletins 723, 724, and 725 Figure 1. Also two 120 VACelectrical supply connections are required for the Potter Panel and the air compressor.Each Reliable PrePaK Preaction System contains the following components within their gauge 12 steelenclosure:• One of the fol low ing Re li able De luge Valves:

– Model H 1½″ (40mm) Deluge Riser Assembly (see Bulletin 507).– Model A 2½″ (65mm) Deluge valve (see Bulletin 503).– Model BX 4″ (100mm) or 6″ (150mm) deluge valve (see Bulletin 501).

• One Re li able Model A-2 Pres sure Main te nance De vice (see Re li able Bul le tin 251)• One Model G Right-Check Valve, sizes 2½″ - 6″ (see Bul le tin 806)• One Gast Tank-Mounted Air Com pres sor

– Model 1 HAB-11T-M100X 16 hp with 2 Gal. (7.6 liters) Tank (1½″ and 2½″ PrePaK)

– Model 5HCD-108 M550X ¾ hp with 10 gal. (37.9 liters) Tank (4″ and 6″* PrePaK) * For 6″ systems, a 1 ½ hp compressor is available as an option.• One Pot ter Model PFC-4410 Fire Alarm/Re leasing Panel (see Pot ter Man ual #5403527)• All re quired pip ing, fit tings, gauges, elec tri cal con nec tors, and elec tri cal de vices to uti lize the

sys tem in sin gle in ter lock, sin gle-interlock cross-zoned, dou ble-interlock and dou ble-interlock cross-zoned ap pli ca tions.

The Reliable PrePaK Preaction Systems utilize the Potter Model PFC-4410 Fire Alarm Releasing Panel. This fully programmable, microprocessor-based releasing panel is Underwriters Laboratories, Inc.Listed and is in compliance with NFPA 13 and NFPA 72.Because the PFC-4410 is totally zone and output programmable, the Reliable PrePaK can be utilized in four different preaction applications without having to rewire any of the factory installed devices. Oncethe previously described connections are completed, the 24 VDC detectors, output devices, and relaycontacts may be connected to achieve the desired system implementation.The PrePaK Preaction System can be used in both single and double-interlock applications. ReliableSingle and Double-Interlock Preaction Systems are designed for water sensitive areas which requireprotection from inadvertent water flow into the sprinkler system piping.The major benefits of Single or Double-Interlock PrePaK Preaction Systems are described in Bulletins723, 724, 725 and in Section 3.1 of this manual.ApprovalsThe Reliable PrePaK Preaction Systems are Underwriters Laboratories Inc. (UL) Listed, and ULCertified for Canada*, as an assembled unit, in the “Special System Water Control Valves-AssembledUnits” category (VKYL). The system components within the PrePaK enclosure are Factory MutualApproved as Supertrol Single-Interlock Preaction Systems and Supertrol Double-Interlock Type DRefrigerated Area Preaction Systems for use in refrigerated rooms or buildings. (Refer to respectivePrePak Bulletins for New York City MEA approvals, guidelines and limitations.)* Electrical devices and control panel must be specified to meet Canadian requirements. This option isavailable.Technical DataThe Reliable PrePaK Preaction Systems are rated for a minimum supply pressure of 20 psi (1,4 bar)and a maximum supply pressure of 175 psi (12 bar).01/01

Model H 1½″ PrePaK Shown

PrePaK Model Fric tion Loss (1) En clo sure Di men sions Shipping WeightModel H 1½″ (40mm)PrePaK 36 ft. (11m)(2) 64″ H x 24″ W x 24″ D

(1626mm H x 610mm W x 610mm D) 460 lbs (209kg)

Model A 2½″ (65mm)PrePaK 62 ft. (19m)(3) 64″ H x 24″ W x 24″ D


Model BX 4″ (100mm)PrePaK 58 ft. (18m)(4) 72″ H x 36″ W x 30″ D


Model BX 6″ (150mm)PrePaK 83 ft. (25m)(4) 72″ H x 36″ W x 30″ D


89

Sys tem De sign Con sid er ationsThe automatic sprinkler releasing devices, fire detection devices, manual pull stations, and signal ingdevices which are utilized with the Reliable PrePaK Preaction Systems must be UL and/or ULC Listed,as applicable. The steel enclosure and all interconnecting piping must be a minimum temperature of40°F (4°C).NOTE: HEAT TRACING IS NOT PERMITTEDThe solenoid valve is operated and supervised by the Potter electric releasing control panel. Details onthe electrical connections of this system to a Potter model PFC-4410 Releasing Control Panel can befound in Potter Manual #5403527, Installation, Operation, and Instruction of PFC-4410 FireAlarm/Releasing Panel. This panel is programmable and may be adapted to several applications.

(1) Fric tion Loss expressed in equiv a lent length of Schedule 40 pipe, based on the Hazen-Williams for mula with C=120 and a flow ing ve loc ity of 15 ft/s (4.6m/s).(2) In cludes To tal Riser As sem bly.(3) In cludes De luge Valve, 90° El bow, Tee, Model G Right-Check Valve, and But ter fly Con trol Valve.(4) Includes De luge Valve, Model G Right-Check Valve, Tee, and But ter fly Con trol Valve.

01/01

The Re li able Automatic Sprin kler Co., Inc., 525 North MacQuesten Park way, Mount Vernon, New York 10552

3.4.3 Double-Interlock Type Supertrol Systems Electric double-interlock preaction systems can be accomplished with several different arrangementsof all the same components that comprise single-interlock preaction systems. A double-interlocksystem is defined as a system which requires the operation of both a detector and a sprinkler beforewater is able to flow through a primary control valve (deluge valve) into the sprinkler system piping.Double-interlock systems are treated as a dry pipe system and therefore are more costly to install thanthe single-interlock types.

Recall that single-interlock systems require only the operation of one (1) or two (2) (cross-zoned)detectors to cause water to flow into the sprinkler piping, making the system ready (wet) for when asprinkler subsequently operates. This brief time of waiting for a sprinkler operation could result in animpairment to fire protection if ambient temperature surrounding the sprinkler system is below freezing.Not only could ice forming inside the piping become an impairment, it could also cause extensivedamage to the sprinkler system and the area/materials being protected by the system.

Consequently, double-interlock arrangements were developed for fire protection that has as muchassurance as possible that water would continually flow through the deluge valve and open sprinklerswhen subfreezing conditions existed. These are the systems of choice for refrigerated warehouses.

Electrical detector activation of the releasing control panel for electrical double-interlock systems isaccomplished in the same manner as activation of single-interlock systems, and the reader is referredto Section 3.4.2 for a description of electrical activation.3.4.3.1 Type ADouble-Interlock Supertrol System (Interlocked Dry Pilot Actuator & Solenoid ValveReleasing Devices) SUMMARY OF OPERATION

The Model A Compressor and the Model B-1 Air Maintenance Device combine to provide air pressurein the sprinkler piping at an appropriate level between 20 and 50 psi (1,4 and 3,5 bar). The purpose ofthis air is to maintain the Model A Dry Pilot Actuator releasing device in the closed position, therebypreventing the possibility of water flowing from the push rod or top chamber of the deluge valve. Thedry pilot actuator functions as described in Section 1.2.2. However, a tank mounted air compressor,supplying air pressure between 50 and 100 psi (3,5 and 6,9 bar) to the Model A-2 pressuremaintenance device, is recommended.

In series with and upstream of the dry pilot actuator is a second releasing device identified as thesolenoid valve. The solenoid valve is activated electrically when a manual electrical emergency stationor a thermal or smoke detector operates and signals the releasing control panel to open the solenoidvalve.

For this system, the double-interlocking feature requires both the dry pilot actuator and the solenoidvalve to be open simultaneously before the deluge valve will open to permit water flow into the sprinklersystem. When only a sprinkler head operates (or is broken), air pressure will be lowered which opensthe dry pilot actuator and activates the low-pressure switch causing only an alarm annunciation. Therewill be no waterflow into the sprinkler system, as long as the solenoid valve remains closed.


90

Conversely, if a smoke detector operates (or produces a false alarm), the signal to the control panelwill, in turn, open the solenoid valve. However, the dry pilot actuator will remain closed therebypreventing the operation of the deluge valve. Again, only an alarm will sound, but there will be nowaterflow into the sprinkler piping.In a fire scenario, operation of a sprinkler and at least one (1) detector will cause both releasing devices to open, thereby opening the deluge valve permitting water to flow into the sprinkler piping and out theopen sprinkler head. Note that the air pressure in the sprinkler piping has the secondary purpose of supervising the integrityof the sprinkler piping. Any condition that would result in significant pressure reduction, such as adamaged sprinkler or broken fitting, would cause an alarm device to annunciate until the damage hasbeen corrected. Also, supervision of various electrical circuits, such as the detector circuit, alarm bellcircuit, solenoid circuit, and power supply circuits are all annunciated by a common trouble bell andindividual circuit lights on the releasing control panel. See Section 1.4.1 for information on the ModelRP1001 Panel.

APPROVALSThe 4 and 6 inch Supertrol Type A Double-Interlock Preaction Systems are Factory MutualApproved for use in refrigerated rooms orbuildings. Refrigerated area sprinkler systemsare FM Approved as complete systems. Onlythe approved components for this system aslisted in this bulletin can be used in combination.Systems are FM Approved for use with thermaldetectors and Class A detector circuit wiringonly.

The Reliable Type A Double-Interlock PreactionSystem is Listed By Underwriters Laboratories inthe Special System Water Control Valves-Double-Interlock Type (VLJH) Category.

The components of the Supertrol Double-Interlock Preaction Systems are individually listed by Underwriters’ Laboratories of Canada.


Type A Double-Interlock System

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91

Type A Double-Interlock Systems must be used with Latching Deluge Valves such as 4″ (100mm) and6″ (150mm) Models B & BX.Non-latching deluge valves may close prematurely if air pressure is permitted to increase above theModel A Dry Pilot Actuator.

*Optional compressor equipment includes: 16 thru 2 hp tankless or tank-mounted types

(recommended). Item 19 must be a Model A-2 Pressure Maintenance Device when tank-mountedcompressors are used.


4″ & 6″ Model BX PREACTION SYSTEM Electric Activation Double-Interlock Type A

Note: The Model A, 2½″Deluge Valve is not available for Type A Systems.

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92



Double - Interlock Type A








2 Deluge Valve D


Mod. BX, 4″ or 6″ FLNG x FLNG or FLNG x GRV

5 Preaction TrimDouble-Interlock Type A

D Mod. B&BX (Bulletin 710)

6 Drain Manifold (Optional) D 4″/6″ Preaction





A Mod. RP-1001


Mod. PS 1270 (60 Hrs Back-up)




Mod. 4XZM Zone Module

11 Alarm Annunciator(Optional)

G Mod. SSM-24-8-24VDC / Polarized Bell




01/01

93


94


(Future)



Double - Interlock Type A







12 Trouble Annunciator (Optional) G Mod. SSM-24-6-24VDC / Polarized Bell











18 Air Compressor D Mod. A, 13, ¾, 1½ hp (Bulletin 275)

Mod. A, 16 hp (Bulletin 707, Section 1.4.2)

19 Pressure Maintenance Device D Mod. B-1, Use with Item No. 18 (Bulletin 251)


23 Accelerator (Optional) D Mod. B1 (Bulletin 320 & 322)

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95


3.4.3.2 Type D Double-Interlock Supertrol Systems (Interlocked Detector & Supervisory Pressure Switch)

SUMMARY OF OPERATION

The Type D Double-Interlock Supertrol System contains a pressure switch which activates one detector circuit in a cross-zoned panel whenever supervising dry nitrogen gas or air pressure in the sprinklerpiping drops below 5 psi (0,4 bar). Normally, the Model A-2 Pressure Maintenance Device wouldmaintain the pressure at 7 to 10 psi (0,5 to 0,7 bar) for supervising the sprinkler system integrity. Aspecial regulator will be required on nitrogen tanks to reduce their 2000 psi (138 bar) pressure down toapproximately 175 psi (12 bar), which is the maximum level required for supplying the Model A-2device. Refer to Section 3.4.3.3 and Bulletin 253 for information describing Reliable’s NitrogenRegulating Device.

When a sprinkler head operates (or is accidentally broken), the resulting reduction of pressure at the low pressure switch will send a pneumatic signal to the RP1001 Releasing Control Panel causing the panelto annunciate a “first” alarm. However, there will not be waterflow into the sprinkler piping. Replacing the broken sprinkler, permitting the pressure to return to the normal 7 to 10 psi (0,5 to 0,7 bar), and pushingthe reset button in the RP-1001 Releasing Control Panel will restore the system to a fire-ready condition.

However, in a fire scenario, the combined operation of a sprinkler and at least one (1) detector on thesecond detector circuit will cause the RP-1001 Releasing Control Panel to activate the solenoid valve,thereby releasing the deluge valve and flowing water into the piping and out the open sprinkler head.Simultaneously, the waterflow pressure switch mounted in the alarm line trim of the deluge valve willoperate, and it will be used to annunciate a “second” alarm (waterflow) condition. This switch (ormultiples thereof) can also be used to start or stop various items of electrical equipment.

It is likely that during a fire, a detector would operate before a sprinkler. Again, the RP-1001 ReleasingControl Panel would signal a “first” alarm without permitting waterflow into the system. After the fire haddeveloped sufficient heat to also operate a sprinkler, and subsequently the low pressure switch, onlythen would water flow into the sprinkler system and out of the open sprinkler. Of course, the various“second” alarm actions would also occur.

The pneumatic system supervision feature has already been discussed. Supervision of variouselectrical circuits, such as the detector, alarm bell, solenoid valve, and power supply circuits areannunciated by a common trouble bell and individual circuit lights on the RP-1001 Releasing ControlPanel.

APPROVALS

The 2½″ (65mm), 4″ (100mm), and 6″ (150mm) Supertrol Type D Double-Interlock Preaction Systemsare Factory Mutual Approved for use in refrigerated rooms or buildings. Refrigerated area sprinklersystems are FM Approved as complete systems. Only the approved components for this system aslisted in this bulletin can be used in combination. Systems are FM Approved for use with thermaldetectors and Class A detector circuit wiring only.

The components of the Supertrol Double-Interlock Preaction Systems are individually listed byUnderwriters’ Laboratories of Canada. The 2½″ (65mm), 4″ (100mm), and 6″ (150mm) Type DDouble-Interlock Preaction Systems are Underwriters Laboratories Listed in the Special System WaterControl Valves Double-Interlock Type (VLJH) Category.


96


(Future)

01/01

97

98

Model BX 4″ & 6″

Note: A Con stant source of pres sure is re quired. A tank mounted air com pres sor is rec om mended . Dry ni tro gen is an op tion for freezer ap pli ca tions.

Model A 2½″




Double - Interlock Type D








2 Deluge Valve D Model A, 2½″ THD x THD or GRV x GRV

Model B, 4″ or 6″ FLNG x FLNG or FLNG x GRV

Model BX, 4″ or 6″ FLNG x FLNG or FLNG x GRV

5 Preaction TrimDouble-Interlock Type D

D Model A (Bulletin 713)Model B&BX (Bulletin 714)

6 Drain Manifold (Optional) D 2½″ Preaction, 4″/6″ Preaction


G Model EPS 10-1 (SPDT)Model EPS 10-2 (DPDT)

8 Mechanical Alarm (Optional) D Model C (Bulletin 612 & 613)


A Model RP-1001


Model PS 1270 (60 Hrs Back-up)


Model 4XLM Annun. Driv. Module

Model RZA-4X Remote Annun.

Model 4XZM Zone Module

11 Alarm Annunciator (Optional) G Model SSM-24-8-24VDC / Polarized Bell

Model SSM-24-10-24VDC / Polarized Bell

Model H 12/24-24VDC Polarized Horn


01/01

99


*Priming water should not be used in systems maintained at temperatures below 32°F (0°C) .

100

01/01The Reliable Automatic Sprinkler Co., Inc., 525 North MacQuesten Parkway, Mount Vernon, New York 10552

(Future)

101

01/01



Double - Interlock Type D







12 Trouble Annunciator(Optional) G Model SSM-24-6-24VDC / Polarized Bell

Model H 12/24-24VDC / Polarized Horn


A Model BNG-1 (SPDT) 1 & 2 Area Detection


Thermal H Model 302 Pendent / Interior, 135°F, 200°F

Thermal Model 302H Horizontal / Interior, 135°F, 200°G


Adapter Model AP-P Adapter Plate (Model 302 Only)

Smoke B Model PSD7125 Photoelectric

Smoke Model CPD7021 Ionization


Model 70-201000-001Base (2-wire)


19 Pressure Maintenance Device D Model A-2, Use with Item number 20

(Bulletin 251)

20 Air Compressor I Model 1HAB-11T-M100X 16″ & 2 Gal Tank

Model 5LCA-11T-M550X ¾″ & 20 Gal Tank


102

01/01


Preaction System1½″ Electrical ActivationDouble-Interlock Type D



(1) System Equipment Manufacturers

(A) Notifier , Division of Pitway Corp.(B) Fenwal Inc., Division of W. Kidde & Co., Inc.(C) Skinner Valve Division, Parker Hannifin Corp.(D) The Reliable Automatic Sprinkler Co., Inc.



2 Deluge Riser Assembly D/C Model H 1½ Thd x Thd (Bulletin 507)

5 Preaction TrimDouble-Interlock-Type D

D Model H (Bulletin 720)


A Model RP-1001


Model PS 1270 (60 Hrs. Back-up)


Model 4XLM Annunciator Driv. Module

Model RZA-4X Remote Annunciator



103

Preaction System1½″ Electrical ActivationDouble-Interlock Type D







11 Alarm Annunciator (Optional) G Model SSM-24-8-24VDC / Polarized Bell

Model SSM-24-10-24VDC / Polarized Bell


Model P2415-24VDC Polarized Horn/Strobe

12 Trouble Annunciator(Optional)

G Model SSM-24-10-24VDC / Polarized Bell



A Model BNG-1 (SPDT)1 & 2 Area Detection


Thermal H Model 302 Pendent / Interior, 135°F, 200°F

Thermal Model 302H Horizontal / Interior, 135°F, 200°F

Thermal Mod. 302AW Pend./All Weather, 135°F, 200°F

Adapter Model AP-P Adapter Plate (Model 302 Only)

Smoke B Model PSD7155 Photoelectric

Smoke Model CPD7051 Ionization


Model 70-201000-001Base (2-Wire)


20Air Compressor

IModel 1LAA-11T-M100X, 1

6 hp Compressor and 2 Gal. Tank (Bulletin 707, Section 1.4.2 & Bulletin720)



104

General DescriptionRe li able Ni tro gen Reg u lating De vices are used to pro vide ni tro gen pres sure in Re li able Supertrol Dou -ble-Interlock Preaction Type D Sys tems or any other Re li able sys tem us ing a Re li able Model A-2 orModel C Pres sure Main te nance De vice. The ni tro gen sup ply is ob tained from a high pres sure ni tro gencyl in der.

In stalled at the su per vi sory pres sure port of the sys tem, the Ni tro gen Regu lat ing De vice in cludes a sin -gle stage pres sure regu la tor equipped with high pres sure in let and low pres sure out let gages. As theni tro gen is gradu ally de pleted and the pres sure in side the cyl in der drops, the low pres sur e regu latedout put re mains sta ble. Con nected to the regu la tor is a coiled cop per tub ing with con nec tor andadapter for a flexi ble and di rect con nec tion to the above men tioned Re li able pres sure main te nancede vices.

If de sired, an op tional ad just able low pres sure switch kit is avail able. In stalled be tween the Ni tro genRegu lat ing De vice out let and the Model A-2 or Model C Pres sure Main te nance De vice in let, i t sig nals acon trol panel such as the No ti fier RP1001 the ap proach ing de ple tion of the ni tro gen sup ply.

The Re li able Ni tro gen Regu lat ing De vice is avail able as sem bled, ready for con nec tion to the sys tem.

Fig ure 1 Ni tro gen Regu lat ing De vice shown with op tional low pres sure switch kit

3.4.3.3 Nitrogen Regulating Device

ItemNo.

PartNumber Description

Qty.Req’d

1 6999991570 Pressure Regulator 1

2 98085630 Connector, ¼″ Tubing x ¼″ NPT 2

3 98768004 Tubing ¼″ O.D. X 6 ft. - Copper 1

4 98048025 Reducer Bushing, ¾″ x ¼″ - Galv. 1

5 6501200100 Optional - Low Pressure Switch Kit 1

Ni tro gen Regu lat ing De viceP/N 6304030101 (Item 5 in cluded)P/N 6304030100 (With out Item 5)

Technical DataThe Re li able Ni tro gen Reg u lating De vice con sists of com po nents shown in Fig. 1.The sin gle-stage pres sure regu la tor, made of brass, has a 200- 4000 psi (13,8 - 275,8 bar) cyl in derpres sure gauge and a 10- 200 psi (0,7 - 13,8 bar) out let pres sure gauge. A coiled ¼″ cop per tub ing al -lows for flexi bil ity in con nect ing the De vice to the sys tem air sup ply in let.

The low pres sure switch kit con sist ing of gal va nized tee, out let nip ple, branch nip ple, branch cou plingre ducer and ad just able low pres sure switch is op tional. Mounted be tween the Ni tro gen Regu lat ingDe vice and the su per vi sory pres sure in let, it sends a warn ing sig nal to re place a ni tro gen cyl in der thatis ap proach ing a pre set pres sure de ple tion level.

The high pres sure ni tro gen cyl in der can typi cally be rented from a lo cal source, with rental fees vary ingby sup plier and cyl in der sizes. Typi cal cyl in ders are:

Cylinder Size: “Q” “S” “K” “T”Nitrogen Weight lbs.(kg): 5.50 (2.50) 10.28 (4.66) 16.51 (7.50) 22.01 (9.98)Nitrogen Volume cu. ft. (m3): 76 (2.2) 142 (4.0) 228 (65) 304 (8.6)Pressurized at psig (bar):* 2200 (151.7) 2200 (151.7) 2200 (151.7) 2640 (182.0)

* Note: Ini tial pres sure and thus ni tro gen weight and vol ume can vary slightly. Check with your lo cal sup plier.

When used in con junc tion with the Re li able Dou ble-Interlock Type D Pre ac tion Sys tem in a re frig er atedarea, the cal cu lated ni tro gen sup ply in lbs. (kg.) to pres sur ize var i ous sys tem ca paci ties to 10 psig (0,7 bar) at dif fer ent freezer tem pera tures is as fol lows:** Note: When used in con junc tion with the Re li able Model A-2 Pres sure Main te nance De vice hav ing

by-pass line open.The ni tro gen used in re frig er ated area sys tems min i mizes a pos si bil ity of ice buildup and block age in sidethe sys tem pip ing that could pre vent proper sys tem op er a tion. The dew-point of ni tro gen com pressed to amax i mum of 10 psig (0,7 bar) pressure in the Re li able Dou ble-Interlock Type D Preaction Sys tem is -52°F(-46.7°C).

The fol low ing list of bul le tins de scribes the sys tems and de vices which are used in con junc tion with this De vice:

Supertrol Double-Interlock Type DPreaction Sys tem 4″ & 6″ (100mm &150mm) size 714

2½″ size (65mm) 713 1½″ size (40mm) 720

Con trol Panel 707/708Model A-2 Pres sure Main te nance De vice 251Model C Pres sure Main te nance De vice 252Low Pneu matic Pres sure Switch (Sys tem Sen sor) D770-08-00

SystemCapacity

Freezer Temperature °F (°C)Approx.Fill Time(min.)**

20° (-6.7°) 0° (-18°) -20° (-29°) -40° (-40°) -60° (-51°)Gal. (L)

2505007501000

(946.4)(1892.7)(2839.0)(3785.4)

4.49 (2.04)8.98 (4.07)13.47 (6.11)17.97 (39.62)

4.69 (2.13)9.37 (4.25)14.06 (6.38)18.75 (8.50)

4.90 (2.22)9.80 (4.45)14.70 (6.67)19.60 (8.90)

5.13 10.2715.4020.54

5.39 (2.44)10.78 (4.90)16.17 (7.33)21.56 (9.78)

1234

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section_3_preaction_special_systems

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