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Resumen del manual
Shim frame under any low sides. 4. After frame has been squared, straightened and shimmed, weld or attach frame securely to roof. MAX. SLOPE TOLERANCE: 1/16" per linear foot in any direction. Note specification of duct location on bottom of HRV when positioning cross members (duct cavity). Roof Curb Assembly Figure 1 side piece slot for tab wood nailer strip side piece slot for tab locking tab spike wood nailer strips tabs through slots end piece wood nailer strip end piece locking tab Figure 2 Figure 3 11 Drains Connect the stainless steel drain pans in the bottom of the HRV to a drain line fastened to the holes provided. See pg.10 for location of the drain pans and the drain connections. Create a "P" trap to prevent odours from being drawn through. Make sure the drain line slopes down to drain properly and if this is not possible a condensate pump will be required for removal of the water. Note that stagnant water is a leading cause of indoor air quality problems; confirm drainage after installation by pouring water into trays. Drain line must be installed where it will not freeze. The Ductwork System A well designed ducting system will allow the HRV to operate at its maximum efficiency. Avoid the use of undersized ducting and sharp radius bends and tees which can significantly increase the system pressure drop and reduce the air flows. NOTE: Fully insulated ducting with an integral vapour barrier must be used on all runs passing through unheated areas in order to avoid condensation problems and energy losses from the air streams. * Consult local Codes To minimize pressure drop and noise, galvanized metal ducts sized for 1200 fpm (6.09 m/s). (maximum velocity) are recommended. Keep ducting as short as possible and use a minimum of elbows and tees. Connecting sections and shorter runs may be flexible ducting one size larger than the metal duct. Use flexible duct connectors at the HRV to avoid noise transmission. All duct joints must be secured with screws, rivets or duct sealant and sealed with aluminum duct tape to prevent leakage. Outside Weatherhoods The 2500EFD is shipped with 2 weatherhoods inside the cabinet which attach to the outer ends of the cabinet using bolts provided. The 2500IFD requires hoods to be built elsewhere and provided by the contractor. The 2500EFD has built-in screens to prevent foreign objects from entering into the ductwork through the outside hoods. NOTE: It is extremely important to design and install the fresh air intake in an area where the hoods will gather the freshest air, free from restriction. Recommended: • no less than 10 ft. (3 m) apart from each other • at least 18 in. (46 cm) above ground level • away from sources of contaminants, such as automobile exhaust fumes, gas meters, garbage containers, cooling towers, etc. • not exposed to prevailing winds, whenever reasonably possible. The outside perimeter of the weatherhood must be caulked to prevent leakage into the building. The design and size of the weatherhoods or louvers chosen by the installer must allow for adequate free area. Water and snow penetration of the system is minimized when the airflow does not exceed 750 FPM (3.81m/s) free area velocity. Ducting from the Weatherhoods Galvanized sheet metal ducting with sufficient cross section with an integral single piece vapour barrier should be used to connect the HRV to the weather- hoods. All ducting must meet ULC Class 1 Fire Rating. A minimum R value of insulation should be equal to 4 (RSI 0.75), or as stated in local codes. A good bead of high quality caulking (preferably acoustical sealant) and taping with a high quality aluminum foil tape is recommended to seal the duct to both the HRV and the weatherhood. Warmside Ducting - General Ducting from the HRV to different areas within the building should be galvanized metal whenever possible. To minimize airflow losses in the ductwork system, all ducts should be as short as possible and with as few bends or elbows as possible. 45° elbows are preferred to 90° elbows, whenever possible. Use Y tees instead of 90° tees whenever possible. All duct joints must be fastened securely and wrapped with a quality duct tape to prevent leakage. We recommend aluminum foil tape. 12 Stale Air Return System The stale air return system is used to draw air from the points in the building where the worst air quality problems occur. Balancing dampers and/or adjustable grilles are recommended on all return air lines which are used during installation to help balance the "draw" from different areas of the building. Note that the installation schematics show balancing dampers and/or adjustable grilles on all return air lines coming back to the unit. Alternately, the stale air may be drawn directly from the return air duct. When this system is used the air handler's blower will need to operate constantly when ventilation is required. The exhaust takeoff connection must be at least a meter from a directly connected HRV supply duct if both ...
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