In applying your regenerative blower, it is therefore necessary to know the operating conditions for the blower. Most blowers (including APPL’s standard models), include motor winding embedded thermistors for protection of the motor.  On small single phase units, these thermistor leads (in the motor terminal box) should be wired in series with the 115V hot lead supplied to the blower. On larger single phase units (over 15 amp service) and on 3 phase models, the thermistors may be used for pilot duty service only. With these voltages, a motor starter must be used and the thermistor should be wired in series with the contactor control coil circuit. If a VFD is used, an input for is usually provided for a motor fault to which the thermistor could be wired. In addition to the winding embedded motor thermistors, standard starters and VFD’s provide overload protection which will protect the

Several descriptive names have been used for “regenerative” blowers by different manufacturers, which may include “side channel”, “vortex”, or “ring compressors”. These are basic descriptions of the blowers based on the dynamic motion of the air stream inside the blower housing as it turns in a spiraling effect. As the impeller blades pass the inlet port in the blower, a low pressure area is generated that draws air/gas into the voids between the impeller blades. The air captured in these voids is thrown by centrifugal force from the base of the impeller to the housing perimeter, then is returned by side channels back to the root of the impeller. The shape of the housing side channels creates a spiraling effect in the air, and the process is repeated. With each rotation of the impeller, many complete air movement cycles take place creating a vortex, and pressure is regenerated each time