SEPARARTED COMBUSTION
INSTALLATION - VENTING – CATEGORY III
COMBUSTION AIR VENTING AND PIPING
Never operate unit heaters without combustion air and flue gas piping in place or severe personal injury or death may occur!
CARBON MONOXIDE!
Your venting system must not be blocked by any snow, snow drifts, or any foreign matter. Inspect your venting system to ensure adequate ventilation exists at all times! Failure to heed these warnings could result in Carbon Monoxide Poisoning (symptoms include grogginess, lethargy, inappropriate tiredness, or
1.The combustion air system installation must be in accordance with the current edition of the National Fuel Gas
2.The concentric vent box, inlet air screen, defl ector disk, and vent terminal provided with the unit heater must be installed at the termination point of the combustion air/vent system. See Figures 20, 21, 22, 23 and 24 and Table 6.
3.Each unit heater MUST have its own combustion air system. It MUST NOT be connected to other air intake systems.
4.Use single wall pipe constructed of 26 GA galvanized steel or a material of equivalent durability and corrosion resistance for the vent system. For installations in Canada, use corrosion resistant and
Never use pipe other than diameter stated inTable 1. Never use PVC, ABS or any other
5.Long runs of single wall combustion air piping passing through an unheated space may require insulating if condensation becomes noticeable.
6.The combustion air system must be installed to prevent collection of condensate. Pitch horizontal pipes downward 1/4 inch per foot toward the inlet cap to facilitate drainage. Vertical combustion air pipes should be piped as depicted in Figure 22.
7.The equivalent length of the combustion air system must not be less than 5 feet (1.5m) and must not exceed 30 feet (9m). Equivalent length equals the total length of straight pipe plus 5 feet (1.5m) for each 90° elbow and 2.5 feet (0.76m) for each 45° elbow.
NOTICE: For optimum performance keep the combustion air system as straight as possible.
8.Each slip joint must be secured with at least three corrosion resistant screws. Two full turns of 3M #425 Aluminum Foil Tape or its equivalent must then be used to seal each joint. General Electric
9.For horizontal combustion air systems longer than 5 feet (1.5m), the system must be supported from overhead building structures at 4 foot (1.2m) intervals in the U.S. and at 3 foot (0.91m) intervals in Canada.
EXHAUST VENTING
NOTICE: Every Separated Combustion unit to be installed MUST use the Factory supplied Concentric Vent Kit. If you do not have this kit, contact the manufacturer ASAP to obtain one prior to installation.
Never operate unit heaters without combustion air and flue gas piping in place or severe personal injury or death may occur!
1.Vent system installation must be in accordance with the current National Fuel Gas
2.The Concentric Vent Kit (which includes a concentric vent box, air inlet screen, deflector collar, vent terminal and inlet air collar) provided with the heater by the manufacturer MUST be installed at the termination point of the combustion air/vent system. See Figures 20, 21, 22, 23 and 24 and Table 6.
3.Each unit heater MUST have it’s own vent system. It MUST NOT be connected to other vent systems or to a chimney.
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