Performance Climate Changer™ Air Handler - Trane

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Central Station Air Handler D. Wheel drive motor shall be provided mounted in the cassette frame. Wheel drive motor shall be thermally protected and UL Component Recognized. Drive belts shall not require belt tensioners. On units that require drive belt tensioners for the wheel belt/motor assembly, the unit manufacturer shall provide at no additional charge to the customer a visual inspection every four months, and adjustment if necessary, of the recommended belt tension during the unit warranty period. Wheel motors shall be of the voltage, phase, frequency, and Hp indicated on the schedule and drawings. E. Wheel bearings shall be permanently sealed and lubricated and have a minimum L-10 life of 400,000 hours. F. Access doors shall be provided for the removal of wheel segments. Doors shall be located on all air entering and air leaving sides of wheel to allow access to the entire upstream and downstream face of each wheel. Adequate space and access shall be provided for energy wheel motor, bearing and belt removal. Access doors shall be constructed per Section 2.04. G. Energy recovery wheels shall be designed with variable effectiveness control, to vary the wheel’s recovery capacity. Variable effective control shall be done by an internal bypass damper provided by the AHU Manufacturer. The wheel’s variable effectiveness control shall have the ability to modulate the total energy recovery ability down to at least 40% of the initial recovery capacity. Variable frequency speed control is not an acceptable method for controlling variable effectiveness. H. Frost prevention shall be achieved by outside air bypass, return air preheat, or outside air preheat, depending upon design conditions. Frost set point temperatures based on the scheduled design air conditions shall be provided by the AHU Manufacturer. Variable frequency speed control is not an acceptable method of frost control. Winter design supply and exhaust air conditions leaving the energy wheel shall be provided by the AHU Manufacturer and shall include any de-rate in performance due to frost prevention measures. I. Control of energy wheels shall be incorporated and an integral part of the AHU control systems and shall be as described under the AHU control specifications. Secondary independent wheel controllers are not acceptable. 2.17 Desiccant Dehumidification Wheel Section A. Desiccant dehumidification wheels shall be provided as indicated on the schedule and drawings. Wheels shall not require an additional regeneration airflow stream or the use of a high heat source. If any preheat is required it shall not exceed the scheduled capacity. B. Desiccant dehumidification wheels shall not utilize exhaust air, and shall have no exhaust air transfer. C. Cassette casings shall be constructed of heavy duty galvanized steel. Cassettes up to 7000 cfm shall be single face panel construction for easy service access to the wheel drive motor and belt. Larger cassettes shall be double face panel with removable side panel for access to belt and drive motor. D. Desiccant dehumidification wheels shall be constructed of synthetic matrixes with an adsorbent integrally bound into the matrix. Adsorbents shall be type III desiccants. Construction of wheels shall be corrugated, fluted design to provide distinct air passageways and prevent internal wheel bypass. Desiccants shall be permanently bound and uniformly dispersed throughout the wheel matrixes to prevent erosion, abrasion, or delamination of the desiccant. Wheel matrixes shall be rigid and glued layer-to-layer. Wheels shall be structurally reinforced with spokes to minimize wheel deflection. Wheels shall be nonmetallic to offer complete resistance to corrosion. Media shall meet the flammability requirements governing this class of products and be UL-recognized in accordance with UL 1812 and UL 1995. CLCH-PRG003-EN Performance Climate Changer Air Handler 16
Central Station Air Handler E. All cassettes shall include both circumferential seals as an air block-off around the perimeter, and inner diametric seals separating regeneration and supply sides. Seals shall be full contact nylon brush seals to minimize leakage. Seals shall be factory set and field adjustable and shall make intimate contact with wheels on all surfaces. Wheel cassettes, wheels and seal configurations shall allow for operation at high differential pressures. Seal replacement shall not be necessary during the life of the product. F. Drive systems shall consist of heavy-duty fractional horsepower motors mounted in the cassette and cooled by the AHU air stream. Drives shall use high performance v-belt multi-link belts with one-inch links to allow for replacement of individual links if a section of belt becomes worn or breaks. Belts shall be installed under tension, shall require no mechanical tensioners, and shall require no adjustment after startup. Rotation speeds of the wheel shall not exceed the scheduled value. G. Wheel matrixes shall be cleanable by vacuuming or pressurized air blowing, or alternatively with low temperature steam, hot water, light detergent. H. Cassettes shall be provided with bearings which support rotation of wheels around a center shaft driven by perimeter belts. All wheels up to and including 72” in diameter shall use permanently lubricated, no maintenance, internal ball bearings press fitted into the bored wheel hub to support the fixed shaft operation of the wheel assembly. All wheels larger than 72” in diameter shall use flanged or pillow block bearings to support the rotating shaft operation of the wheel assembly. Outboard bearings shall be provided with grease fittings for periodic lubrication. L-10 bearing life shall be greater than 400,000 hours at design conditions. I. Wheel cassettes shall be capable of continuous operation over ambient temperatures ranging from -40 to 200 degrees Fahrenheit at any relative humidity without adversely affecting wheel performance or life. J. Performance shall be predicted by selection software as scheduled and shall be based on testing conducted on the wheel cassette installed in the AHU configuration as shown in the AHU drawings. Performance based on stand-alone desiccant wheel cassette or tests with two independent air streams are unacceptable. Testing shall be performed and data collected on complete unit performance by an ISO 9000-certified laboratory. Temperature measurements shall be taken using instrumentation whose calibration is traceable to NIST standards. Dry bulb and wet bulb temperature measurements shall be accurate to +/- 0.1 degrees Fahrenheit. Performance predictions for the desiccant dehumidification wheel AHU shall be available for multiple conditions as required. K. Access doors shall be provided on all air entering and air leaving sides of wheel to allow for wheel maintenance, belt or motor removal. Access doors shall be constructed per Section 2.04. 2.18 Dual Path Air-Handling Units A. Air handling units shall be designed for dual path as indicated on the plans to separately condition recirculated return air from outdoor air. Each air path shall include a dedicated cooling coil with a single supply fan serving both paths and shall be constructed as a single air handling unit to minimize unit footprint. Outside air and return air unit sections shall be of the same unit casing construction as indicated in Section 2.03. B. Units are to be completely factory-assembled to the extent allowable by shipping limitations with all required factory-supplied support bracing. C. Supply fan must be sized for total supply airflow and to accommodate the highest static pressure operation through recirculated return air and/or outside air paths. D. Pre-engineered openings are to be provided from the manufacturer to allow entry of outside air to be mixed with return air. E. The return air path cooling coil shall be sized per the schedule to maintain design space temperature of the recirculated return air. 17 Performance Climate Changer Air Handler CLCH-PRG003-EN
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