Variable speed ge ecm motors when you look at buying a new hvac system it will surely arise when the hvac salesman or hvac contractor who comes to give you an estimate will show an hvac system that has a variable speed motor or the ge ecm electronically commutated motor installed in it. In one sense this is true it does vary its rpm of the motor but only in response to changing conditions in the system.
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Ec brushless electric motors are commonly used to power condenser and evaporator fans in hvac r equipment such as display cases ice machines and walk in coolers.
Ecm motor hvac. This includes air conditioners heat pumps and furnaces. Ecm motors contain a microprocessor which is the key component of what makes them. Ecms provide the same output as comparable shaded pole and psc induction motors while using less electricity and they maintain their efficiency at a wide range of operating speeds.
It should be noted that the ecm motor programming is specific to each model of hvac equipment so programming is only done at the factory not in the field. When a furnace or air handler with an ecm is installed on a good duct coil and filtration system with static pressures within proper design parameters it can perform flawlessly. Tesp system the motor still may be able to maintain airflow close to design.
An ecm motor is some times referred to an a variable speed motor. First of all there are two components to an ecm motor the control module and the motor itself. In the simplest terms an ecm motor lowers the total electrical consumption of an ac or furnace and helps to maintain proper air flow through the system.
In other hvac units an ecm can run at variable speeds but depends on a controller that pre programs speed including the rate at which the motor ramps up. These are systems that have a higher efficiency rating than the hvac equipment that has the typical. The letters ecm stand for electronically commutated motor which might sound a bit complex to understand.
A psc motor has an expected service life of only 50 000 hours or eight years before replacement is required. Typically psc motors start and almost immediately run at full capacity while an ecm can start slowly and stop slowly which helps reduce humidity in a room. Ecm motors can adjust the air flow depending on what the system is getting for feedback.
These motors are used in pumps fans and increasingly in compressors and other motor applications. Increased comfort because a furnace ecm motor runs a longer cycle at a lower output most of the time heating and cooling is more consistent and rooms avoid the temperature spikes and sags common with on off psc blowers. Ecm motors are providing a variety of benefits to commercial hvac systems over traditional psc motors.
But in the truest sense all it trying to do is maintain a programmed cfm. When ordering a replacement ecm motor techs must know the specs of the model in which the motor will be installed for it to work properly. Ecm motors are commonly used in hvac systems these days as blower motors.
In marginal systems with higher than design static pressures for example a 5 in. Tesp rated furnace with ecm on a 8 in. Ecm motors energy savings and added functionality.
