Go Green Already the industry leader in energy effi cient fan coil products, Airtherm has taken a leap forward with new energy saving motor technology that can offer our customers the highest level of energy efficiency which may also qualify for LEED points and utility rebates. In addition to the energy saving benefits, this technology offers building owners ultra quiet operation, enhanced system control and retrofit capabilities with existing Airtherm fan coil installations.

Upgrade and Save Electronically Commutated Motors (ECM) are highly efficient at full and part load with efficiencies up to 85% compared to 40% with traditionally 3-speed PSC motors. Fan coils are often overlooked by energy conservation professionals because of their fractional horsepower and low power consumption, however Airtherm’s solution will allow cost effective energy savings which will satisfy green building initiatives.

Retrofit and Save Airtherm has engineered their ECM offering so that it is backward compatible with their Unitaire products installed over the years. Simply replacing the existing fan deck with a new ECM fan deck in the existing piped cabinet is easy and quick. Airtherm Unitaire fan coils can enjoy the energy savings without re-piping or replacing whole units. This allows them to reap the benefits of improved energy efficiency without the mess of remodeling an entire building.

Benefits of Airtherm Fan Coil Units • A special bonding process provides the sturdy cabinets with an attractive powder coat finish. • Our exclusive Condensate Removal System (CRS) eliminates standing water, improving IAQ by reducing odors and decreasing humidity. • Two 9" deep end pockets and removable panels provide easy access, saving time and money during installation and maintenance. • Resilient motor mounts and insulated discharge panels dampen air sounds for quiet operation. • Reversible coils give added flexibility when piping and installing units. Airtherm Control Interface Airtherm developed a control interface to provide the energy savings benefits with the ECM to adapt to the existing controls. A full featured controller provides interface to a standard thermostat controlling the fan, valves and ECM motor. Standard thermostat commonly found in standalone fan coil systems and will control the fan and valves through it’s 24 volt controls and relays. The dry contacts of the board relays will switch 24 volt or 120 volt valves and dampers on a call for heating or cooling. The controller includes the interoperability to other Building Automation Systems by including BACNET or LONWORKS communication protocols. Whether you choose to use the ECM powered fan coil as a standalone thermostatically powered controlled unit, or integrated to a Building Automation System, this single control does it. This means that virtually any building using hydronic fan coils can take advantage of the savings. Sequence of Operation The Airtherm control interface operates through a standard thermostat which provides the enhanced features an ECM Unitaire fan coil off ers. The thermostat provides the temperature and setpoint control and inputs to the interface to manage the ECM fan, heating and cooling and optional damper. An occupancy control is also provided if desired.

During a satisfied condition, the ECM fan will operate at low flow. Constant airflow through the conditioned space will minimize stratifi cation, provide eff ective measurement of the unit sensors and reduce temperature swings as may be realized with fan cycling controls. In this mode, the power consumption of the fan is as little as a LED bulb of under 9 watts.

When the thermostat calls for heating, the heating relay will enable a valve (or other heating medium) and the fan will ramp up to the heating airflow. The fan will increase from the idle speed to the heating flow over two minutes, providing a gradual ramp up, where most occupants will not notice the change. When the thermostat is satisfied, the valve(or heat) will be disabled and the fan returned to idle fl ow in two minutes.

On a call for cooling, the cooling relay will be enabled the same as the heating sequence, and will allow a valve (or other cooling means) to operate. The same ECM fan ramp up of 2 minutes will begin until the set point is satisfied. When satisfied, the cooling relay will be disabled and the two minute ramp down will begin.

In addition to the heating and cooling relays, a damper relay is available to enable a damper to open during an occupied cycle for ventilation. A occupancy input is available on the Airtherm controller, to accept a motion or other occupancy device and enable the ventilation damper and occupied mode.