1 IntroductionVLT® HVAC DriveFC 100 SeriesThis guide can be used with allVLT® HVAC Drive frequencyconverters with software version3.7x.The actual software versionnumber can be read from15-43 Software Version.1.1.1 Copyright, Limitation of Liability andRevision RightsThis publication contains information proprietary toDanfoss. By accepting and using this manual the useragrees that the information contained herein will be usedsolely for operating equipment from Danfoss or equipmentfrom other vendors provided that such equipment isintended for communication with Danfoss equipment overa serial communication link. This publication is protectedunder the Copyright laws of Denmark and most othercountries.Danfoss does not warrant that a software programproduced according to the guidelines provided in thismanual will function properly in every physical, hardwareor software environment.Although Danfoss has tested and reviewed the documen-tation within this manual, Danfoss makes no warranty orrepresentation, neither expressed nor implied, with respectto this documentation, including its quality, performance,or fitness for a particular purpose.In no event shall Danfoss be liable for direct, indirect,special, incidental, or consequential damages arising out ofthe use, or the inability to use information contained inthis manual, even if advised of the possibility of suchdamages. In particular, Danfoss is not responsible for anycosts, including but not limited to those incurred as aresult of lost profits or revenue, loss or damage ofequipment, loss of computer programs, loss of data, thecosts to substitute these, or any claims by third parties.Danfoss reserves the right to revise this publication at anytime and to make changes to its contents without priornotice or any obligation to notify former or present usersof such revisions or changes.1.1.2 Approvals1.1.3 SymbolsSymbols used in this guide.NOTEIndicates something to be noted by the reader.CAUTIONIndicates a potentially hazardous situation which, if notavoided, may result in minor or moderate injury orequipment damage.WARNINGIndicates a potentially hazardous situation which, if notavoided, could result in death or serious injury.* Indicates default settingIntroduction VLT® HVAC Drive Programming GuideMG.11.CC.02 - VLT® is a registered Danfoss trademark 31 1