Other consequences of high static installations include noise at the registers from higher air velocities. Newer models are designed to drop airflow but time will tell on how well they will hold up. Some older ECM motors will overheat and even fail when constantly running in over-amped conditions. When this happens, some ECMs will ramp down and drop airflow significantly. Systems with TESPs of 1.0 and higher, which are more typical than many non-performance-based contractors are willing to admit, can eat up to eight times the power they should be using. This reduces actual equipment EER, which means your customer won’t get the savings of the higher efficiency matchup. The extra torque often required to overcome the higher statics results in higher electrical consumption. The tradeoff is higher velocities often cause a noisy system and some coil blow-off. TESP system – the motor still may be able to maintain airflow close to design. In marginal systems with higher-than-design static pressures – for example, a 0.5-in. When installed properly, systems with ECMs can improve dehumidification, reduce register noise, save energy, and provide trouble-free operation. These systems can deliver precise airflow to match two-speed condenser designs and multi-stage gas furnace firing rates to deliver quiet, draft-free comfort in virtually any configuration.Īdditional benefits of these brushless DC motors include low electrical consumption when operating within design Total External Static Pressure (TESP). 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. Let’s take a candid look at the good, bad, and ugly of the application of these great gems of technology. There are, however, some serious downsides associated with the improper application of these motors in new and existing HVAC systems. To ensure that the MX960 delivers the lowest cost per port without sacrificing performance, reliability, scalabilityfunctionality, it has been purpos-built to optimize both switching and carrier-class Ethernet routing functionality.Electronically Commutated Motors (ECMs) manufactured today are the best they’ve ever been and can provide unprecedented airflow delivery to match the required BTUH of a heating and/or cooling system. Технические характеристики Juniper MX960BASE-AC-ECM:Ĭhassis, Midplane, RE, 2-SCB, AC PEM, Enhanced Cable ManagerĬhassis, Midplane, RE, 2-SCB, 3 AC PEM, Enhanced Cable Manager