On 17-8-2020 16:49, Brian Lamb wrote:
3hp is 3hp, doesn¡¯t matter if it¡¯s a single or three phase motor. If the specs say the same CFM is accomplished, then the specs are most likely wrong, or they are using the same exact impeller and housing and the 4hp motor is essentially over kill for the application. Don¡¯t forget, Felder uses the S1 and S6 motor specifications, so hp is a relative term depending upon the rating of the motor¡. the S1 3hp motor is the same as a S6 4hp motor. It is a marketing gimmick.
No it is not. It has to do with duty cycles and periods under load and reaching thermal equilibrium.
S1 means continuous duty under load, S6 means continuous operation with periodic duty, which means the difference between S1 and S6 is that in the latter situation the motor runs at no-load, without actual stopping for a while in between periods of use.
See for illustrative diagrams and explanation:
Regards,
Jonathan
Jonathan Martens