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Resumen del manual
45° elbows are preferred to 90° elbows, whenever possible. Use Y tees instead of 90° tees whenever possible. Ail duct joints must be fastened with screws or rivets and wrapped with a quality duct tape to prevent leakage. We recommend aluminum foil tape. To avoid possible noise transfer through the ductwork system, a short length (approximately) 12 in. (30 cm) of non-metallic (i.e. NUFLEX flexible insulated) duct may be connected between the HRV and the supply/exhaust ductwork system. The use of TECHGRILLES™ (from NUTECH) as supply air diffusers and air exhaust covers are recommended. They are efficient, sound absorbing devices specifically designed for this installation. If a "regular style" steel grille is used, the preferred wall grille size is 5 X12 in. (13 X 30 cm) and floor grille size is 4 X 10 in. (10.2 X 25 cm). Smaller grille sizes may restrict air flow. FRESH AIR SUPPLY SYSTEM The fresh air from the HRV may be directed at a grille installed in the cold air return duct of the furnace. The fresh air supply outlet from the unit should be no closer than 4 in. (10.2 cm) and no further than 12 in. (30 cm) from the grille. NOTE: The grille in the cold air return duct must be at least 6 1/2 ft. (2 m) from the furnace, if fossil fueled, or as specified by local regulatory codes. The use of balancing dampers and/or adjustable grilles to balance the flow rates into various rooms is recommended. TheTECHGRILLE™ .availablein4“,5“, 6" (100,125 and 150 mm) is highly recommended. The TECHGRILLE™ is a round, fully adjustable grille, which provides superior, quiet air distribution. See Fig. 3. NOTE: Do not use any louvered hoods with installation of LIFEBREATH™ HRV, as this will restrict the required air flow. The fresh air supply from the HRV to the house can follow several installation strategies. See Figures #4 and #5 for two installation schematics. The installation schematic shown in Figure #4 has proven to be an excellent method for both retrofit and new home situations where a forced air furnace is available. The installation schematic shown in Figure #5 is often installed in new or existing homes that do not have a forced air ducting system to distribute the fresh air throughout the house. For Figure #5, fresh air should be supplied to all rooms, but it is not required in those with exhaust points in them. Supply airgrilles may be floor or high wall mounted, but should not be located in areas where the fresh air will cause an uncomfortable draft on the occupants. TECHGRILLES ™ diffuse cool air exceptionally well to avoid drafts. Avoid installing supply air grilles in bathrooms, or any other small room (with significant air quality problems) if it has an exhaust already. INSTALLATION FIGURE #6 In this method (See Fig. 6), the supply air is ducted directly into the cold air return of the central forced air furnace. NOTE: The installation schematics show a balancing damper on the supply duct leaving the unit. This is installed to balance the supply of air from the unit. Should you wish to hard duct the supply air directly into the cold air return of the furnace, remember to check the air flow balance of the HRV with the furnace fan both "ON" and "OFF" to determine that it does not imbalance the HRV more than 10%. Also, it is advisable to include a short length of fabric flex duct or other non-metallic connector in this hard ducted line in order to keep the HRV separately grounded (electrically) from the furnace. This will avoid a possible shock hazard to Service People if a short to ground develops in one of the devices. STALE AIR RETURN SYSTEM The stale air return system is used to draw airfrom the points in the house where the worst air quality problems occur. It is recommended that return air ducts are brought back from the bathroom, kitchen, and laundry room. Additional return air ducts from strategic locations (i.e. greenhouse, atrium, swimming pool, sauna, etc.) may be installed. Note that the installation schematics show balancing dampers and/or adjustable grilles on all return air lines coming back to the unit. These are installed to help balance the "draw" from the different areas of the house. The damper located just prior to the Heat Recovery Ventilator is provided to balance the stale air exhausted out of the house with fresh air supply entering the house. We recommend the use of high mounted wall returns with grilles. The exhaust air duct from the kitchen should never be connected to a range hood. Instead, an exhaust air grille should be mounted high on the wall at least 4 ft. (1.2 m) horizontally away from the stove. A flip up 8" x 10" rectangular kitchen grille with removable grease filter is available from NUTECH if so desired. The gyproc and studs of the wall can be used as a "duct" for high wall returns. When using wall cavities this way, they should be lined with either galvanized sheet metal or polyethylene (check Local Codes). The wall plate and the floor ply must be c...
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