Compressor installation equipped with a dryer and a compressor with an inlet for gas to be compressed and a pressure pipe for compressed gas, whereby this pressure pipe is connected to a first inlet of a first subzone of a regeneration zone of the dryer for the supply of a warm, first regeneration flow to this first subzone, whereby the dryer comprises a vessel with the aforementioned regeneration zone and a drying zone therein; whereby this dryer is further provided with a first inlet of the drying zone and a first outlet from the drying zone, whereby the dryer is further provided with a second subzone of the regeneration zone with a second inlet and whereby this dryer is further provided with a second outlet from the first and second subzones (6 and 7) of the regeneration zone; whereby a rotatable drum is provided in the vessel with a regeneratable drying agent therein and drive means for rotating the aforementioned drum so that the drying agent moves successively through the drying zone and the regeneration zone, characterised in: that the aforementioned second outlet of the regeneration zone is connected by means of a connecting pipe with a cooler and condensate separator therein to the aforementioned first inlet of the drying zone; that the first outlet of the drying zone is connected to the aforementioned second inlet of the second subzone via a tap-off pipe for the supply of a second regeneration flow, that no tap-off pipe is connected to the aforementioned pressure pipe and that the compressor installation is configured such that the entire flow rate of warm, compressed gas to be dried coming from the compressor, is first guided through the regeneration zone, before being guided through the drying zone; that means are provided for boosting the aforementioned second regeneration flow from the drying zone, through the tap-off pipe, to the second subzone and these means comprise a blower in the aforementioned connecting pipe, and that the dryer is provided with restriction means that prevent gas from being able to flow from the drying zone to the regeneration zone via the connecting pipe. that the aforementioned second outlet of the regeneration zone is connected by means of a connecting pipe with a cooler and condensate separator therein to the aforementioned first inlet of the drying zone; that the first outlet of the drying zone is connected to the aforementioned second inlet of the second subzone via a tap-off pipe for the supply of a second regeneration flow, that no tap-off pipe is connected to the aforementioned pressure pipe and that the compressor installation is configured such that the entire flow rate of warm, compressed gas to be dried coming from the compressor, is first guided through the regeneration zone, before being guided through the drying zone; that means are provided for boosting the aforementioned second regeneration flow from the drying zone, through the tap-off pipe, to the second subzone and these means comprise a blower in the aforementioned connecting pipe, and that the dryer is provided with restriction means that prevent gas from being able to flow from the drying zone to the regeneration zone via the connecting pipe.