Honeywell F-BO-AFE70 Series Installation, Connection, Commissioning, Maintenance

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Honeywell F-BO-AFE70 Series Installation, Connection, Commissioning, Maintenance Manual pdf 26 page image

Chapter 8 • Mounting and connection of pneumatic components User Manual Series F-BO-AFE70The pipe is connected by carefully inserting the pipe, which has been prepared as described above,into the 25mm push-in fitting as far as it will go, the insertion depth is approximately 39mm. Aftercompleting these activities, check the correct fit of the pipe.The pipe system that is connected to the Automatic Purging Unit F-BO-AFE70, including allcomponents installed in the pipe, such as filters, must be designed such that it withstands thestatic overpressure of the connected compressed-air supply with sufficient safety. Although usu-ally this pressure is never reached during normal operation, this pressure can be reached in caseof severe clogging of the piping. Therefore you absolutely have to contact the suppliers of thecomponents and make sure that the components meet the requirements.If the piping and the components connected to it have not been laid professionally or ifcomponents are used which do not withstand the maximum pressure that is available,severe injuries or damage can occur!It is recommended that, if possible, the aspirating smoke detector should only be installed in thecourse of commissioning the Purging unit, because the pneumatic connection between the Pur-ging unit and the aspirating smoke detector has to be interrupted when commissioning starts.8.2.1 Loosening the pipe connectionThe Purging unit's connection to a 25mm pipe can also be loosened again by unscrewing the 25mmpush-in fittings.Make absolutely sure that, before starting this activity, both the supply line of the com-pressed air as well as the supply voltage are reliably turned off or disconnected and thatthey can not be turned on or connected again by mistake.To unscrew the 25mm push-in fitting you need a suitable wrench for applying a counteracting forceon the hexagon surface of the push-in fitting (wrench size 32mm), as well as a suitable open-endwrench (or, if necessary, a suitable pair of pliers) for unscrewing the push-in fitting via the octagonsurface (wrench size 35mm). It is not necessary to disassemble the push-in fitting, it only has to beunscrewed as far as necessary to easily pull out the pipe by hand. When unscrewing the connection,also make sure that the push-in fitting is not screwed off from the valve body by mistake.Before the 25mm push-in fitting can be used again after pulling out the pipe, it must be screwedtogether again (3Nm torque) and checked for flawless condition of all components.After finishing the work, make sure that the fit of the push-in fittings is correct and safe.8.2.2 Use of filtersIf it must be expected that the air that is drawn in by the aspirating smoke detector will be particu-larly dirty, it is recommended that an air filter should be installed between the pipe system and thePurging unit. Without appropriate prefiltering of the intake air, the accumulation of dust inside thehousing of the Purging unit can cause increased abrasion or even result in the valve piston gettingstuck.In the event of a fault in the purification of the compressed air, solid or liquid particles in the com-pressed air which are aspirated again by the aspirating smoke detector after the Purging process hasbeen carried out, can cause deceptive alarms or result in the rapid contamination of the aspiratingsmoke detector. As a precaution it is therefore recommended that a prefilter should be used betweenthe Purging unit and the aspirating smoke detector.Many types of aspirating smoke detectors already have prefilters built into their evaluation unit,therefore a separate prefilter between Purging unit and evaluation unit is not needed.In any case, filters must comply with the system approval of the aspirating smoke detector used.Pay attention to the project planning instructions of the manufacturer of the aspirating smokedetector.I56-4252-010D200-104-0026