I am replacing the motor on a whole house fan. The old one was 1/3HP 220V single phase. The new one is 1/3HP 220V split phase. Will the low, high and common connections be the same or is there different wiring for the split phase motor?
The term "single-phase" would apply to all types of single-phase motors, split-phase, shaded-pole, universal and others. If the motor is self-contained, there should be only two power connections, L1 and L2 or L1 and neutral. In addition, the motor housing should be connected to protective earth ground. If there are three power connections, the third connection would be for an external capacitor. If that is the case, you need to identify the capacitor rating and which connections it should be connected to. If you have purchased a motor that lacks that information, return it and buy a motor that has the proper information.