TotalPac®2 Dry - FIREFLEX SYSTEMS

TOTALPAC2 Page 1 of 4TOTALPAC2 Integrated Fire Protection SystemDry Pipe Accelerator Option5. Air Supply AccessoriesThe Viking Model E-1 Accelerator is a quick-openingdevice. When installed with the required external Anti-floodDevice (on dry pipe systems only), it is used to increase theoperational speed of a differential type valve. Anaccelerator (quick-opening device) is recommended on alldifferential dry pipe valves and is required on dry pipesystems of certain capacities. Refer to NFPA Standardsand Authorities Having Jurisdiction. The Viking Model E-1Accelerator may also be used without the Anti-flood deviceto speed the action of a pneumatic release system on adeluge, flow control or preaction system.Features:.A al AntAutomatically resets..B Externi-flood Assembly..C UL Listed for use on systems of maximum capacityallowed..D Factory tested.Operation:The Viking Model E-1 Accelerator operates on the principleof unbalanced pressures. As the accelerator ispressurized, air enters the inlet chamber, goes through thescreen filter into the middle chamber and through an orificeinto the lower chamber. From the middle chamber, airslowly enters the upper chamber through a filtered orificerestriction in the cover diaphragm.In the SET position, the system air pressure is the same inall chambers. When a sprinkler or release device operates,the pressure in the middle and lower chambers is reducedat the same rate as the system pressure. The orificerestriction in the cover diaphragm restricts the air flow fromthe upper chamber, temporarily causing higher pressure inthe upper chamber.The pressure differential forces the cover diaphragm down,pushing the actuator rod down. This action vents thepressure from the lower chamber to the outlet vent,allowing residual pressure in the inlet chamber to force theclapper diaphragm open. After the clapper diaphragmopens, any pressure remaining in the inlet chamber andassociated piping is vented to atmosphere.As the air pressure increases in the intermediate chamberof the dry valve, the dry valve pressure differential isdestroyed and the valve trips, allowing water to enter thedry pipe system.After the dry valve trips, water entering the intermediatechamber of the dry valve will fill the trim piping connectingthe accelerator to the dry system. However, when the antifloodassembly is pressurized closed, water is preventedfrom entering the middle and upper chambers of theaccelerator.To enable or reset the Accelerator Device:When the dry pipe system is ready to be placed in service,verify that all equipment is adequately heated and protected toprevent freezing and physical damage.1. Close the Anti-flood isolation valve (1).2. Close the Accelerator isolation valve (2).3. Observe the Accelerator pressure gauge (3) on top of theaccelerator. The gauge must read zero before theaccelerator will automatically reset. It may be necessary toloosen, remove, and re-install the accelerator air gauge (usethe appropriate wrench) to vent trapped air pressure fromthe upper chamber even when the gauge indicates zero ifthe air supply is on while performing this step.4. Pressurize the system in accordance with recommendedsettings. See technical data for the dry system used. Do notexceed 60 PSI (4.1 bar).5. Open the Accelerator isolation valve (2). When air pressureon the accelerator air gauge equals the system set pressure,open the Anti-flood isolation valve (1).6. When the air pressure on the accelerator air gauge equalsthe system set pressure, perform Dry Pipe Valve PrimingWater level test to verify that water is not present above thePriming Level Test Valve in the dry valve trim. This test isimportant because any water columning (accumulation ofwater above the Priming Level Test Valve) can starve theaccelerator sensing port and may cause false tripping of thesystem.To isolate the Accelerator Device:Close both the Anti-Flood isolation Valve (1) and theAccelerator isolation Valve (2), positioning the handle acrossthe valve body. This operation can be necessary in order toverify the pressure adjustments or to allow the pressureswitches adjustments.Refer to instructions described on Viking datasheet no. 122(Form No. 071692).Viking Accelerator Model E-1 (for dry pipe systems)FM-086G-0-52C