1 IntroductionVLT HVAC Basic DriveSoftware version: 1.2XThis guide can be used with all VLTHVAC Basic Drive frequencyconverters with software version1.2X.The actual software version numbercan be read from15-43 Software Version.1.1.1 Copyright, Limitation of Liability andRevision RightsThis publication contains information proprietary to Danfoss.By accepting and using this manual the user agrees that theinformation contained herein will be used solely foroperating equipment from Danfoss or equipment from othervendors provided that such equipment is intended forcommunication with Danfoss equipment over a serialcommunication link. This publication is protected under theCopyright laws of Denmark and most other countries.Danfoss does not warrant that a software program producedaccording to the guidelines provided in this manual willfunction properly in every physical, hardware or softwareenvironment.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, orfitness for a particular purpose.In no event shall Danfoss be liable for direct, indirect, special,incidental, or consequential damages arising out of the use,or the inability to use information contained in this manual,even if advised of the possibility of such damages. Inparticular, Danfoss is not responsible for any costs, includingbut not limited to those incurred as a result of lost profits orrevenue, loss or damage of equipment, loss of computerprograms, loss of data, the costs to substitute these, or anyclaims 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 users ofsuch revisions or changes.Introduction VLT HVAC Basic Drive Programming GuideMG.18.B1.02 - VLT® is a registered Danfoss trademark 51 1