TYPE CRBCA - BELT DRIVE DOMED POWER ROOF VENTILATORS, UL705
Power Roof Spun Aluminum Ventilators of Type CRBCA manufactured by ILG Industries of American Coolair Corporation meet UL Standard 705 and bear the AMCA Certified Ratings Seal for air and sound performance. Base and venturi inlet is one piece heavy gauge spun aluminum or galvanized steel, with wheel and venturi overlapping for efficient operation. Motor compartment cover is of heavy gauge aluminum construction and easily removable for access to motor and drive. Drive construction shall be of the ILG “C-Drive” design consisting of static shaft/bearing arrangement mounted in a machined cast aluminum disc assembly. The disc assembly is mounted onto the backplate of the centrifugal wheel. The centrifugal wheel shall is of heavy gauge aluminum with backward-inclined, non-overloading blades and is computer balanced. Bearings shall have a calculated L10 bearing life in excess of 1,000,000 hours. Motor is of open drip-proof construction, NEMA design B with minimum service factor of 1.15. Adjustable motor pulley provided to allow for field adjustment and system balance. Motor is mounted on a hinged steel mounting bracket, utilizing a belt tensioning bolt. Motor is mounted with the shaft down to allow easy access to the electrical wiring terminal board/circuit box. The belt driven CRBCA utilizes a unique bearing/shaft arrangement that has been designated the “C-Drive”. This “C-Drive” is patterned after American Coolair’s unique static shaft drive design that has been in existence for over eighty years, serving the general ventilation markets with reliable propeller products. This type of drive uses a captured bearing arrangement inside a cast aluminum disc assembly locked to a short, large diameter shaft. The shaft is held stationary and the centrifugal wheel/disc assembly rotates on the shaft instead of the entire assembly rotating. As a result of reduction of radial loading of the bearings, the calculated L10 bearing life exceeds 1,000,000 hours or an average bearing life of 5,000,000 hours. Additionally, the machined surface of the “C-Drive” provides a rigid backplate for the centrifugal wheel. Electrical connections on the end of the motor face upwards making field connections rapid and simple. This compact drive assembly provides more room in the motor compartment area and the single bolt, V-belt adjustment makes for a very serviceable unit. CRBCA models feature a housing of durable spun aluminum for optimum weather protection. The overlapping deep-spun venturi minimizes air turbulence and increases efficiency. The aluminum centrifugal wheel is a non-overloading, backward-inclined type, selected for low noise levels. Backplate fins draw cool air through the motor compartment. The wheel is secured to the machined aluminum “C-Drive” disc, and computer balanced on state-of-the-art equipment. Neoprene vibration isolators to reduce noise and vibrations. Galvanized ˝” mesh bird guard is a standard accessory.
Prefabricated Roof Curbs: Insulated roof curbs with weather-resistant continuous welded construction. Available with treated wood nailer, aluminum, or galv. steel construction, 8”, 12”, or 24” high; with dam[per shelf and accordingly pitched to meet roof profile.
Special Motors: ALL SINGLE PHASE UNITS COME WITH OPEN DRIP PROOF MOTORS AS STANDARD AND HAVE BUILT IN THERMAL OVERLOAD PROTECTION . Two-speed, totally enclosed, energy efficient and explosion-proof motors for hazardous locations are available. Motor requirements may affect UL Listing.
Backdraft Dampers: Gravity, or motor operated aluminum back-draft dampers are available.
Safety Disconnects: Safety disconnects to cut power to motor for servicing of unit, available as plug-in internal NEMA1 disconnect, or external NEMA3R/NEMA4 disconnect.