Is it ok to substitute a 5 speed blower motor for a 4 speed blower motor?

[zoiks]

Repairing a TRANE furnace with a 4 spd GE5kcp39mgs879s motor. I've got a 5 spd motor that is a drop in replacement except for the 4 vs 5 speeds. Are there any issues with using this and just not connecting 1 of the 5 speeds? Which speed should be dropped?

[classical]

Repairing a TRANE furnace with a 4 spd GE5kcp39mgs879s motor. I've got a 5 spd motor that is a drop in replacement except for the 4 vs 5 speeds. Are there any issues with using this and just not connecting 1 of the 5 speeds? Which speed should be dropped?

Yes it is possible to install a 5spd motor for a 4spd motor, in order to determine which speeds to use you will need to know the CFM and TSEP rating for each speed according to that particular furnace.

[zoiks]

thanks for the response. I've got the table for the old motor.