OEM Carrier Bryant Payne Furnace ECM Blower Motor 3/4 HP 115V Replaces HD46MR121. This is a brand new OEM Carrier Bryant Payne upgraded Furnace ECM Blower Motor 3/4 HP 115V. It replaces the part numbers listed below. An electric motor converts electrical energy into mechanical energy. In an HVAC system, motors typically turn the air conditioning fan blade and the furnace blower motor. Newer high efficient motors, such as X13 and ECM motors, have end caps that control the motor speeds. These can be removed and replaced separately. Replaces Old Part #s. Partial List of Units that Use This Item. Hit Ctrl + F and enter your model number for a quick search!