Dacor PHG30 Installation Instructions - Page 6

Installation Specifications Electrical Specifications WARNING The electrical service to the range hood should be installed only by a licensed electrician. It is the owner's responsibility to ensure that the electrical connection of this appliance is performed by a qualified electrician. The electrical installation, including minimum supply wire size and grounding, must be in accordance with the National Electric code ANSI/NFPA* (or latest revision) and local codes and ordinances. * A copy of this standard may be obtained from: National Fire Protection Association 1 Batterymarch Park Quincy, Massachusetts 02269-9101 Connect the hood to a junction box supplied by a 120 Vac, 60 Hz dedicated, grounded, 3-wire (hot, neutral, ground) circuit protected by a 15 Amp. circuit breaker or time delay fuse. It must be installed a minimum of 17 inches above the bottom of the hood. Planning the Duct Work WARNING • To reduce the risk of fire and to properly exhaust air, be sure to duct air outside the house or building. Do not vent exhaust air into spaces within walls or ceilings or into attics, crawl spaces or garages. • To prevent combustion by-products smoke or odors from entering the home and to improve efficiency, tape all duct joints securely. • Do not exhaust more than one vent into a single duct run. • TO REDUCE THE RISK OF FIRE, USE ONLY METAL DUCT WORK. • DO NOT install an additional in-line or external blower to increase the length of the duct run. Even small differences between blower air flow rates can greatly reduce the air draw of the hood. • All duct work materials (including screws and duct tape) must be purchased separately by the customer. • The hood exhaust connects to an 8-inch round duct. You can increase the duct size over the duct run if desired. To prevent a back draft, never decrease the duct size over the run. If existing duct work is smaller than 8 inches in diameter, remove it and replace it with 8-inch duct work. • Do not rely on tape alone to seal duct joints. Fasten all connections with sheet metal screws and tape all joints with certified silver tape or duct tape. Use sheet metal screws as required to support the duct weight. • To prevent back-drafts, a damper at the duct outlet may also be required. • When planning new duct work, always look for the shortest, most direct route to the outside. Venting can be done through the roof or directly through the back wall to the outside as shown. • Make sure duct work does not interfere with floor joists or wall studs. Calculating the Maximum Duct Run Length The maximum straight duct length for the hood is 50 feet. To determine the actual maximum duct run, subtract the equivalent length of each elbow, transition and cap from 50 feet. EQUIVALENT LENGTHS Piece 8" 90° elbow 8" 45° elbow 3¼" X 10" to round 90° transition Roof cap Subtract 7 feet 3 feet 25 feet * Piece 10" 90° elbow 10" 45° elbow 3¼" X 10" to 8"/10" round transition Wall cap with damper Subtract 5 feet 2 feet 4 feet * * The equivalent lengths of roof and wall caps vary with model and configuration. For equivalent length, contact the manufacturer or a qualified HVAC specialist. Duct Work Design Tips • Wherever possible, reduce the number of transitions and turns to as few sharp angles as possible. Two staggered 45° angles are better than one 90°. • Keep turns as far away from the hood exhaust as possible, and as much space between bends as possible. • For best performance, use round duct instead of rectangular, especially when elbows are required. • If multiple elbows are used, try to keep a minimum of 24 inches straight duct between them. Avoid "S" or "back to back" use of adjacent elbows. • In regions where the weather gets extremely cold, use thermal breaks, such as a short section of non-metallic duct, to avoid indoor heat loss. Locate the break as close as possible to the outside pass through point. • Do not use flexible metal duct. • DO NOT use duct work that is smaller in crosssectional area than the recommended size duct (8" round). 4