Worldwidewww.tyco-fire.comContactsModel ACC-1 Dry Pipe Valve AcceleratorExtenal Resetting Quick Opening DeviceFor Dry Pipe ValvesGeneralDescriptionThe TYCO Model ACC-1 Dry Pipe ValveAccelerator is a quick opening deviceintended for attachment to the TYCO,2-1/2, 3, 4 or 6 inch Model DPV-1 DryPipe Valve. The Model ACC-1 Accelerator reduces the time for valve operationfollowing the operation of one or moreautomatic sprinklers.The Model ACC-1 Dry Pipe ValveAccelerator automatically adjusts toboth small and slow changes in systempressure, but trips when there is a rapidand steady drop in pressure (as in thecase of a sprinkler operation). Upontripping, the Accelerator transmitssystem air pressure to the intermediatechamber of the Model DPV-1 Dry PipeValve. This neutralizes the differential pressure holding the Model DPV-1Dry Pipe Valve closed and permits itto open.The Model ACC-1 Dry Pipe Valve Accelerator has a unique, positive action,internal anti- flood device and a ballfloat which combine to prevent waterand water borne debris from enteringthe more sensitive operating areas ofthe accelerator. The anti-flood deviceseals and latches immediately uponoperation of the Model ACC-1 Accelerator without waiting for a pressurebuild-up in the intermediate chamber ofthe dry pipe valve. The latching featurekeeps the anti-flood device sealed,even while the system is being drained.The ball float seals the pilot chamberinlet port if there is an inadvertent tripof the dry pipe valve, due for example,to an air compressor failure combinedwith a slow loss in system air pressuredue to a leak.cal Services Department for information concerning the use of the ACC-1for use with dry pipe valves other thanthe Model DPV-1.NOTICEThe TYCO Model ACC-1 Dry Pipe ValveAccelerator described herein must beinstalled and maintained in compliancewith this document, as well as with theapplicable standards of the NATIONALFIRE PROTECTION ASSOCIATION, inaddition to the standards of any otherauthorities having jurisdiction. Failureto do so may impair the performanceof this device.The owner is responsible for maintaining their fire protection systemand devices in proper operating condition. Contact the installing contractor or product manufacturer with anyquestions.TechnicalDataApprovalsUL and ULC ListedFM ApprovedLPCB ApprovedMaximum Working Water PressureDesignDataThe connection to the system piping,Figure 4, must be located so that drainback water will not flow into the Accelerator piping and it must be located ata point above the maximum expectedlevel of the drain back/condensatewater.If the connection is made to the riser, itmust be located at least two feet abovethe level of the dry pipe valve. Connections to a feed or cross main must bemade either to the side or top of themain.250 psi (17,2 bar)Maximum Working Air Pressure70 psi (4,8 bar)Pressure Decay For Trip1 psi/min (0,07 bar/min)Physical CharacteristicsBody components constructed ofalodine coated aluminum alloy withaustenitic series stainless steel internal components. Seals are EPDM andsilicone.The Model ACC-1 Dry Pipe Valve Accelerator is a direct replacement for theCentral Model B, Gem Model F311, andStar Model S430. Contact the Techni-NOTICEFailure to follow the above instructionscan result in accidental tripping due toclosure of the ball float.Quick operation of the Acceleratordoes not ensure that the fire protection system will meet the water delivery time requirement of the authorityhaving jurisdiction (following opening ofthe Inspector’s Test Connection). Thesprinkler system designer needs to beaware that water delivery time is primarily determined by the configuration andvolume of the piping network, systemair pressure at time of Accelerator trip,and water supply characteristics.IMPORTANTRefer to Technical Data SheetTFP2300 for warnings pertaining toregulatory and health information.Page 1 of 10AUGUST 2018TFP1112
TFP1112Page 2 of 10OperationThe Inlet Chamber of the Accelerator,Figure 1, is pressurized via its connection to the system (at a point abovethe maximum expected level of drainback water). The Pilot Chamber is, inturn, pressurized through its inlet portwhich is formed by the annular openingaround the lower tip of the Anti-FloodValve. As the Pilot Chamber increasesin pressure, the Differential Chamberis pressurized through the Restriction.The Accelerator is in its set positionwhile it is being pressurized as wellas after the Inlet, Pilot Chamber andDifferential Chamber pressures haveequalized. When in the Set position,the Outlet Chamber is sealed off bythe Exhaust Valve which is held againstits seat by a combination of the Springpushing up against the Lever and thenet downward force exerted by thepressure in the Pilot Chamber.Both small and slow changes insystem pressure are accommodatedby flow through the Restriction. When,however, there is a rapid and steadydrop in system (i.e., Inlet and PilotChamber) pressure, the pressure inthe Differential Chamber reduces ata substantially lower rate. This condition creates a net downward force onthe Plunger which rotates the Lever. Asthe Lever is rotated, Figure 2, the ReliefValve is raised out of the Relief Portand the Anti-Flood Valve is depresseddownward into the Pilot Chamber InletPort, venting the Pilot Chamber.The system pressure in the InletChamber then forces (raises) theExhaust Valve off its seat. This continues the rotation of the Lever into thetripped (latched) position, Figure 2. Asthe Exhaust Valve is raised off its seat,system pressure is transmitted to theintermediate chamber of the dry pipevalve which neutralizes the differentialpressure holding the valve closed.Following the dry pipe valve trip, majorwater borne debris is prevented fromentering the Accelerator (via the connection to the system piping) by theStrainer located at its Inlet. Water andany fine water borne debris such assilt is prevented from entering the PilotChamber by virtue of the Anti-FloodValve having sealed off its inlet port.The Check Valve located downstreamof the Accelerator Outlet prevents anywater borne debris from entering theAccelerator via the connection to theintermediate chamber of the dry pipevalve.After the accelerator/dry pipe valvehas tripped and the sprinkler systemhas been drained, the piping from the1/4" NPT CHAMBERSPRINGANTI-FLOOD VALVEBALL FLOAT1/2" NPT INLETPILOT CHAMBERINLET PORTRELIEF VALVEINLET CHAMBER1/2" NPT OUTLETEXHAUST VALVEOUTLET CHAMBERFIGURE 1MODEL ACC-1 ACCELERATORIN SET POSITIONPLUNGERLATCHRESET KNOBLEVERFROMSYSTEMPIPINGRELIEF PORTTO DRYPIPE VALVEINTERMEDIATECHAMBERFIGURE 2MODEL ACC-1 ACCELERATORIN TRIPPED POSITIONsystem to the Accelerator must alsobe drained and the Accelerator reset/inspected according to the instructionsgiven in the Setting Procedure section.The rate-of-flow through the Restriction has been set such that the ModelACC-1 Accelerator provides themaximum practical sensitivity to a lossin system pressure due to a sprinkleroperation while still being capable ofautomatically compensating for normalvariations in system pressure such asare caused by environmental temperature changes. A test for verifying thatthe rate-of-flow through the Restriction is within the range for optimumAccelerator performance is given in theSetting Procedure section.
TFP1112Page 3 of SCRIPTIONBaseCoverUpper DiaphragmPlatePivot Plate AssemblySpirol PinPivot PlatePlungerPan Hd. Machine ScrewUpper DiaphragmRetaining RingUpper DiaphragmJam NutExhaust ValveUpper PlugWasherLower DiaphragmLower PlugO-Ring*O-Ring RetainerExhaust Valve ScrewRd. Head MachineScrew1/4 -20 UNC x 5/8 QTY.P/N1NR1NR1See (c)11111DescriptionRepair PartsKit (a)ReplacementParts Kit (b)ReplacementParts Kit (c)See (b)See (a)P/NIncludes Items 5, 6, 8, 10, 11, 23, 27& 1.5 grams of FS3452Include Items 4, 13-22, 29& 1.5 grams of FS3452Includes Items 3, 7, 9, 12, 24-26, 28,& 1.5 grams of 11155b5c5b5d2See (c)Cover GasketVent PlugO-Ring*RestrictionRestriction Access PlugPan Hd. Machine Screw10-32 UNF x 5/8 Cotter PinLeverRetaining RingAnti-Flood ValveRelief ValveSpringRelief Valve SeatO-Ring*Seal WasherLatchFillister Hd. MachineScrew1/4”-20 UNC x 1-1/2 11111See (a)See (c)See (a)See (a)See (c)4See (b)1111111111See (b)See (b)See (b)See (b)See (b)See (b)See (b)See (b)See (b)See (a)8See (c)Plug SeatO-Ring*O-Ring*Reset KnobAnti-Flood SeatAssembly w/Ball FloatInsertSealGuideBallClipO-Ring*1111See (c)See (c)See (a)See (c)1See (b)1111115aSee (a)6* Requires thin film of FS3452Fluorosilicone GreaseReplacement Part KitsKit9 (VENTPLUG358311131444a4b1529b12 (RESTRICTIONACCESS 9f6e6f6g1272425NR: Not Replaceable26FIGURE 3MODEL ACC-1 ACCELERATORASSEMBLY28 (RESETKNOB)
TFP1112Page 4 of 10NO. DESCRIPTIONQTY P/N1 250 psi/ 1750 kPaAir PressureGauge . . . . . . . . . . . 12 1/2" Y-Strainer . . . . 1NO. DESCRIPTION92-343-1-01252-353-1-005NO. DESCRIPTIONQTY P/N3 1/2" Ball Valve . . . . 14 1/2" SwingCheck Valve . . . . . . 15 1/2" Union. . . . . . . . 246-050-1-00446-049-1-004CH* In accordance with the 2007 edition of NFPA 13, 188.8.131.52, the Accelerator Control Valveshall be supervised. Where a signaling service is to be utilized, replace the Ball Valvewith a BVS-1/2" electrically supervised control valve.QTY P/N6 1/2" 90 Elbow . . . . 37 1/2" x 1-1/2"Nipple . . . . . . . . . . . 68 1/2" x 3" Nipple. . . . 19 1/2" x 3-1/2"Nipple . . . . . . . . . . . 110 1/2" x 5-1/2"Nipple . . . . . . . . . . . 1CHCHCHCHCHCH: Common Hardware1/2" NPTCONNECTION TOSYSTEM PIPINGACCELERATORCONTROL VALVE *(NORMALLY OPEN)ACCELERATORPRESSUREGAUGEDRYPIPE /2" NPTACCELERATORTRIM CONNECTIONTO INTERMEDIATECHAMBER5962-1/2 or 3 INCH (DN65 or DN80)ACCELERATORCONTROL VALVE *(NORMALLY OPEN)ACCELERATORPRESSUREGAUGEDRYPIPE VALVEACCELERATORDRYPIPE CELERATORPRESSUREGAUGEACCELERATORCONTROL VALVE *(NORMALLY OPEN)1/2" NPTCONNECTION TOSYSTEM PIPING7871/2" NPTCONNECTION TOSYSTEM PIPING3*1RESETKNOB677VENTPLUGDRYPIPE VALVEACCELERATOR51RESTRICTIONACCESS PLUGACCELERATORPRESSUREGAUGE3*964 INCH (DN100)1/2" NPTACCELERATORTRIM CONNECTIONTO INTERMEDIATECHAMBER1/2" NPTACCELERATORTRIM CONNECTIONTO INTERMEDIATECHAMBER6 INCH (DN150)FIGURE 4MODEL ACC-1 DRY PIPE VALVE ACCELERATOR TRIM FOR2-1/2, 3, 4, AND 6 INCH MODEL DPV-1 DRY PIPE VALVES
TFP1112Page 5 of 108"(200 mm)2-1/2 & 3 INCH(DN65 & DN80)VALVE15"(380 mm)21-1/8"(540 mm)15"(380 mm)12"(300 mm)4 INCH(DN100)VALVE24-1/2"(625 mm)11-1/2"(290 mm)11-1/8"(283 mm)6 INCH(DN150)VALVE23-3/4"(600 mm)FIGURE 5MODEL ACC-1 DRY PIPE VALVE ACCELERATOR TRIMMODEL DPV-1 DRY PIPE VALVE INSTALLATION DIMENSIONS
TFP1112Page 6 of 10InstallationThe TYCO Model ACC-1 Dry Pipe ValveAccelerator must be installed in accordance with this section.NOTICEFailure to follow these instructions canresult in flooding of the Acceleratorand accidental tripping due to closureof the ball float.Step 1. The Accelerator must be positioned vertically and trimmed per thearrangement shown in Figure 4. Applypipe thread sealant sparingly to malethreads only.Step 2. The Strainer located at theAccelerator Inlet must be installedwith its arrow pointed towards theAccelerator.Step 3. The Check Valve located in theline between the Accelerator Outletand the intermediate chamber of thedry pipe valve must be installed horizontally with its arrow pointed in thedirection of flow to the intermediatechamber.Step 4. The connection to the systempiping must be located so that drainback water will not flow into the Accelerator piping and it must be located ata point above the maximum expectedlevel of the drain back/condensatewater.If the connection is made to the riser, itmust be located at least two feet abovethe level of the dry pipe valve primingwater. Connections to a feed or crossmain must be made either to the sideor top of the main.Step 5. The accelerator/dry pipe valvecombination must be installed in aheated enclosure which is maintainedat a minimum temperature of 40 F/4 C.Heat tracing is not permitted.Step 6. Close the Accelerator ControlValve until the Model ACC-1 Accelerator is ready to be placed in service.The Accelerator Control Valve must beclosed during hydrostatic testing of thesystem in order to prevent damage tothe Ball Float. After the system is hydrostatically tested and drained, the Accelerator connection to the system mustbe independently drained through theStrainer clean-out plug by first removing the Strainer clean-out plug and thenopening the Accelerator Control Valveto vent the line.SettingProcedureThe TYCO Model ACC-1 Dry Pipe ValveAccelerator must be reset and restoredto service as soon as possible after anoperation. Follow the procedure indicated below.Step 1. Close the system main controlvalve, the air supply control valve (tothe system) and the Accelerator ControlValve.Step 2. Open the Inspector’s Test Connection and then open the main drainvalve as well as all auxiliary (low point)drains.Step 3. After the system has beendrained, close the Inspector’s TestConnection and all auxiliary drainvalves. Leave the main drain valveopen.Step 4. Set the dry pipe valve in accordance with the instructions given inthe appropriate technical data sheet.Restore normal system air pressure.Leave the main control valve closedand the main drain valve open.Step 5. While holding the plunger of thedry pipe valve’s automatic drain valvedepressed, partially open the Accelerator Control Valve, and allow the waterin the Accelerator piping to blow out.After water spray stops discharging,close the Accelerator Control Valve andthen release the plunger. (This instruction does not apply when the ModelACC-1 Dry Pipe Valve Accelerator isbeing set for the first time, since theAccelerator is shipped in the set position. Proceed to Step 6