A New Level of Energy Efficiency Airtherm offers institutional quality fan coil products with energy efficient These robust ECM fan coils use less energy, and can adapt to applications that others can't. Plus they are made in the U.S.A. Easily boost efficiency by adding an ECM to an existing fan coil unit Airtherm fan coil units' resiliant motor mounts, insulated discharge panels, and EC Motors result in quieter operation than other fan coils. Improved controls that interface with either a thermostat or BMS to improve the operating efficiency and comfort levels. EC motors are highly efficient, quiet, and compact motors; which are more flexible to control than 3-speed PSC motors and great for retrofits. Airtherm's institutional quality fan coil units are engineered for long life, efficient installation, easy service, and improved IAQ. Unique controls allow for cost effective, yet efficient operation also improving comfort.AirRevive compared the operation of two hotel guestroom vertical fan coil units.

The property is located in New York City. The study was conducted during August 2014. Fan coil unit details The purpose of the study was to compare the performance of the existing fan coil unit with a PSC motor against the performance of a fan coil unit retrofit with an EC motor. PSC Motor Horse Power: 1/30 EC Motor Horse Power: 1/8 The following operational performance data was monitored from each unit between August 12th and August 29th, 2014: The MPY03 model is designed to produce airflow between 330 and 200 CFM. The airflow from the unit retrofit with an EC motor is programmed on high speed to 331 cfm and low speed to 227 cfm. This airflow is aligned with the manufacturer’s specifications. When the airflow is aligned with the manufacturer’s specification the air moves across the coils and fins at the correct speed. This facilitates proper heat transfer thus cooling or heating the air efficiently. CFM PSC Motor                CFM EC Motor

High Speed         407                                         331 Low Speed          302                                        227split unit ac fujitsu Savings based on New York City $0.152/kWh, 8760 hours annual run-time.hvac rooftop unit maintenance 884,760 watts reduced on high fan – 70% reductionlennox ac parts miami 719,000 watts reduced on low fan – 80% reduction Up to $134 potential savings per unit annually Annual energy savings varies based on actual run-time. In the graph below the unit retrofit with an EC motor is represented by the orange line and the unit with a PSC motor is represented by the blue line.

The chart illustrates the energy consumed by each unit at low and high speeds. The EC motor operates between .4 amps (off) and increases to .8 amps in use. The PSC motor operates between 1 amp up to 1.7. Guest Comfort and Asset Protection The narrow band suggests intended temperature set points are reached faster and more accurately. The PSC motor represented by the blue lines produced guest room temperature that varied widely between 54 degrees and 68 degrees. The unit retrofit with an EC motor represented by the orange lines produced guest room temperature that fluctuated narrowly between 64 degrees to 68 degrees. AirRevive’s room temperature is constant maintaining a comfortable guest room environment. The data demonstrates that the unit retrofit with an EC motor maintained the guest room temperature within a 4 degree variance while the PSC motor produced guest room temperature that varied between 14 degrees. Guest Room Relative Humidity

Relative humidity below 66% signifies dry air. The unit retrofit with an EC motor maintained guest room relative humidity at or below 65%. The PSC motor guest room humidity ranged daily between 65% – 90%. This allowed for high humidity time periods. The data demonstrates that the EC motor maintained guest room relative humidity within a narrow band while the PSC motor produced relative humidity that fluctuated widely. These results are to be expected because the EC motor airflow is programmed to the manufacturer’s design specifications. When the air moves across the coil at the correct speed the coil evaporates humidity as designed. The PSC motor relative humidity fluctuated widely because the motor on high speed over-blows, which does not allow for water to be evaporated from the air. Click on graph to enlarge. The humidity graph (above left) and the guest room temperature graph  (above right) demonstrate that the unit retrofit with an EC motor (orange lines) produced slightly higher guest room temperature within a narrow band while maintaining lower relative humidity.

The PSC motor (blue lines) produced cooler guest room temperature coupled with higher relative humidity. This combination of cool air with high humidity results in an uncomfortable guest room that is often characterized by dank feeling. These graphs side-by-side clearly demonstrate that the EC motor produced a more comfortable guest room. Mold spores begin to grow when humidity hits 66%. The unit retrofit with an EC motor creates a healthy, dry environment preventing mold spore. The dry room also prevents A/C related odor spreading and embedding into the room assets. CONTACT US TODAY TO SETUP A PRESENTATION AND ONSITE DEMO. You are hereHome ECM/EPIC Fan Technology® Significant energy savings (67% average compared to PSC motors) Unique factory pre-set air volume capability (+/- 5%) Pressure independent fan operation LED for visual indication of air volume Field adjustable fan air volume controller Remote fan air volume adjustment capability from BAS

Larger turn down ratios mean more flexibility for tenant changes Since 1985, equipment manufacturers have used ECM motors in residential air conditioners and furnaces. These motors have made it possible to achieve SEER ratings of 12 and higher. Until more recently though, they were only manufactured in 120 and 240 VAC, which precluded their use in commercial applications. Following two years of research and development and the availability of a new 277 VAC version, Engineered Comfort was first to introduce the ECM motors to the commercial HVAC market as an option for use in commercial fan coil unit applications. What is an ECM Motor? The ECM (Electronically Commutated Motor) is an ultra high efficiency programmable brushless DC motor utilizing a permanent magnet motor and a built-in inverter. DC motors are significantly more energy efficient than AC motors and much easier to control. The major weakness of commercial fan coil units until now, has been their low fan motor efficiency.

The widely used three speed fractional horsepower shaded pole and permanent split capacitor (PSC) induction motor in combination with a 3 speed switch or an electronic SCR speed controller is extremely inefficient at typical operating conditions. Due to acoustical considerations, the fan motor is usually adjusted to operate at considerably less than full load (where PSC motor efficiencies may be as high as 62%). PSC motor efficiency drops off dramatically when turned down; typically by at least half. Installed PSC motor efficiencies are therefore typically in the range of only 12 – 45%. ECM motors in contrast, maintain a high efficiency of 65 – 72% at all speeds.In addition to lower operating costs, ECM motor technology allows Engineered Comfort to pre-set the fan airflow volume at the factory.The graphs shown in our catalog demonstrate the lower watts per cfm (translating into lower operating costs) and wider operating ranges of commercial fan coils employing ECM/EPIC Fan Technology® versus PSC induction motors.

Soft starts and slewed speed ramps are programmed into the ECM motor eliminating stress transmitted to the mounting bracket or hardware. They incorporate ball bearings providing permanent lubrication unlike sleeve bearings requiring a minimum rpm operation for oiling. The wider operating range of the ECM motor allows each model to actually replace two models using induction motors. This feature alone provides several benefits: a simpler product line to choose from, little or no equipment changes necessary when tenants change, more similar sized units on the job, decreased spare parts inventory and increased contractor flexibility. The low operating temperature of the ECM motor (essentially ambient) requires very little energy to offset the heat gain from the motor versus PSC motors which run hot (typically around 90 – 150ºF). ECM/EPIC Fan Technology® provides an average 90,000 hours of operation (versus 50,000 hours for a typical PSC motor). This translates into about 10 years for a typical fan coil as opposed to 8 for a one using a PSC motor.

In addition to these standard features are two primary benefits, energy savings and the ability to pre-set the fan airflow volume at the factory. Why and How do You Pre-set Fan Airflow? Pre-setting the fan airflow (cfm) has not been an issue with fan coil manufacturers because these units were either on at full load or off in normal operating conditions. With ECM/EPIC Fan Technology®, the fan coils can now be run as a VAV device with all of the requisite savings that VAV brings to other commercial jobs. (See control sequence in our catalog for further explanation.)AC motors are not synchronous machines and the rpm, and consequently the unit cfm, changes when static pressure changes. The difficulty in pre-setting the fan lies in estimating the motor workload required at the job site in actual working conditions. The fan operated by an AC motor will not produce the same volume of air as it did at the factory without the duct work or loaded filter. Because there is no way to accurately predict the downstream static pressure as it would exist at the job site, it was impossible to pre-set the fan cfm.

The ECM motors are DC and inherently synchronous machines. The motors are programmed to calculate the work they are doing and then compare the work accomplished to the cfm requirement. The integral microprocessor based controller automatically adjusts the speed and torque in Engineered Comfort commercial fan coil units Engineered Comfort fan coil units incorporate our own custom EPIC™ fan controller. An electronic PWM volume control device that allows adjustment of airflow volume. Minimum and Maximum airflows can be pre-set on the assembly line. It is field adjustable either manually using a screwdriver and voltmeter locally at the fan coil or with the Engineered Comfort thermostat and controller or remotely using a 0 – 10 VDC analog output from a digital controller via the BAS or Engineered Comfort’s standard thermostat and controllers. A fan volume versus DC volts calibration chart is provided. The importance of this feature is the energy that is saved due to controlling the fan airflow as well as the large reduction in noise generation.