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

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Honeywell F-BO-AFE70 Series Installation, Connection, Commissioning, Maintenance Manual pdf 23 page image

User Manual Series F-BO-AFE70 Chapter 7 • Special notes on using the F-BO-AFE70-3 in refrigeration areas7 Special notes on using the F-BO-AFE70-3 in refrigeration areasThe problem in refrigeration areas is that due to condensation and ice formation, ice crystals canform on aspiration holes and in the sampling pipe and have to be blown out regularly.The place of installation of the Purging unit must be chosen such that condensation is precluded atall times.After installing the Purging unit at the place where it will be used, you have to wait until the Pur-ging unit has become acclimatised to the ambient temperature of the refrigeration area before youconnect it. For this purpose it is recommended that the cover of the Purging unit be removed andthe two protective covers of the 25mm push-in fittings be removed (if they have been installed).Take care that contaminants or foreign objects can not get into the push-in fittings.After acclimatisation to the final ambient temperature, the two 25mm push-in fittings have to bechecked for tight seat and, if necessary, they have to be tightened up. Only after that is the Purgingunit to be electrically connected and mechanically connected to the sensor pipe network and to thecompressed-air system, according to the instructions provided in the chapters that follow.In particular, make sure that only dried compressed air is used for the operation of the Purging unit,because residual humidity in the compressed air can lead to icing of the Purging unit.Please note the demands on the compressed air, see Chapter 4.2: „Compressed-air supply“ frompage 15 onwards.The sampling pipe must have the same temperature as the refrigeration area.I56-4252-010D200-104-0023