The duct work should be designed so the external static pressure does not exceed 0 .2 water column inches, while developing air velocities of 600 feet to 1,000 feet per minute in the main trunk duct and 400 feet to 600 feet per minute at the registers. The heat outlet should never be less than 10 inches round or 79 square inches. The Ignite Tech Furnace must be installed with a cold air return system. The system must be a minimum of 12 inches to readily transfer the cold air back to the furnace. If desired, a cold air filter box may be constructed with a minimum opening of 225 square inches. A foundation window is an excellent location for running the hot air duct vent as well as the vent for the cold air return. The cold air return is an integral part of the system and must be used when installing the furnace. Failure to use cold air return will pressurize the building causing the furnace to not work properly. If a basement window is not available, you may access the building through a window, wall, or crawl space for both the plenum and air return. Run the thermostat wire (not supplied) from the 2 posts located on top of the control center transformer. NOTE: You may run the thermostat wire and power cord through the return cold air duct, or you may access the hole from the bottom of the blower housing cover. THE HOLE MUST BE SEALED AFTERWARD, REGARDLESS OF ROUTING CHOICE.
Burying Ductwork: DO NOT BURY FLEXIBLE DUCT.
To bury the ductwork, use schedule 40 or 80 PVC or black plastic DUAL WALL CULVERT PIPE with smooth inner walls. Dig a trench to accommodate both the heat duct and the return air duct. The trench must be a minimum of 24 inches deep. To further ensure efficiency, minimize heat loss, and prevent moisture formation, line the trench with 1 inch pink Styrofoam insulation sheeting on the sides and bottom of the trench. The duct run should not exceed 25 feet. If the run exceeds 25 feet, you run the risk of reducing the furnace’s efficiency and airflow. DO NOT USE FLEXIBLE HOT AIR DUCT INSIDE PVC OR CULVERT PIPE. ALWAYS KEEP YOUR WOOD COVERED YEAR ROUND. DRY WOOD WILL PRODUCE MORE BTU OUTPUT AND A LONGER BURN TIME. The diagram on page 9 shows typical installations through a foundation window, crawl space, or wall. Notice that the heat duct and return air duct do not contain any 90° elbows. The use of 45° or less is advised for proper air delivery. IF 10 INCH FLEX DUCT IS USED, IT MUST NOT BE EXPOSED TO THE OUTDOORS. IT IS FOR INDOOR USE ONLY. WARNING: RISK OF FIRE! DO NOT USE ANYTHING OTHER THAN 250° F-RATED FLEX DUCT! IMPORTANT: FOR TECHNICAL SUPPORT OR CUSTOMER SERVICE ISSUES, CALL IGNITE TECH AT 1-800-875-4788. T ypes of Installations : Your Ignite Tech Furnace is designed to be a supplemental or central heating source for your building. This wood/coal burning furnace may be installed in parallel with a properly operating electric, gas, or oil-fired central furnace that is listed or certified in accordance with a nationally recognized safety standard within installation clearances as specified on the Ignite Tech Furnace nameplate. When in a parallel installation the static pressure of the central furnace plenum may not exceed .15 water column inches, and the maximum setting on central furnace limit switch is 182° F. With the HD90X wood and coal burning furnace in an “Interconnection Arrangement” your Ignite Tech Furnace should be upstream from the central furnace. The Ignite Tech Furnace warm air supply should never be connected to the return air for the central furnace. A QUALIFIED INSTALLER SHOULD PERFORM INSTALLATION. CENTRAL DUCT CONNECTIONS: A qualified professional should do the installation. Maximum run should be 25 feet. A duct run in excess of 25 feet will greatly restrict the air flow and heat output, therefore is not recommended. When connecting the Ignite Tech Furnace to a central duct system, avoid 90° elbows. As with any furnace, the more turns and branches in the ducting limit the airflow delivery. DO NOT USE FLEX DUCT OUTSIDE.
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