5.23.2 Variable Speed Driver .................................................................................................................................. 25
5.23.2.1 VSD in cooling, cooling glycol or ice mode .......................................................................................... 25
5.23.2.2 VSD in heating mode ........................................................................................................................... 26
5.23.3 Speedtroll...................................................................................................................................................... 26
5.23.4 Fans control at startup in heating mode ....................................................................................................... 26
5.24 Other functions ...................................................................................................................................................... 26
5.24.1 Hot Chilled Water Start ................................................................................................................................. 26
5.24.2 Fan Silent Mode ........................................................................................................................................... 26
5.25 Unit and compressors status ................................................................................................................................ 26
5.26 Start-up sequence ................................................................................................................................................. 28
5.26.1 Unit start-up and shut-down flowcharts ........................................................................................................ 28
5.26.2 Heat recovery start-up and shut-down flowcharts ........................................................................................ 30
6 ALARMS AND TROUBLESHOOTING ......................................................................................................................... 32
6.1 Unit trips ................................................................................................................................................................ 32
6.2 Compressors trip ................................................................................................................................................... 32
6.3 Other trips.............................................................................................................................................................. 33
6.4 Unit and compressors alarms and corresponding codes...................................................................................... 33
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