Natco F85H Fire Coil 85 200 Installation And Operation Instructions Manual
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Fire Coil 85 (200, 300, 400) Page 92.1.2 Intake Combustion AirThe combustion air can be taken through thewall, or through the roof. When taken from the wall,it must be taken from out-of-doors by means of theNATCO horizontal wall terminal (see Table 1). Whentaken from the roof, a field-supplied rain cap or anelbow arrangement must be used to prevent entry ofrain water (see Figure 2).Use single-wall galvanized pipe, per Table4, for the combustion air intake (see Table 1 forappropriate size). Route the intake to the heater asdirectly as possible. Seal all joints with tape. Provideadequate hangers. The unit must not support theweight of the combustion air intake pipe. Maximumlinear pipe length allowed is 50 feet (15.2m). Threeelbows have been calculated into the 50-foot (15.2m)linear run. Subtract 10 allowable linear feet (3.0m) forevery additional elbow used (see Table 1). When fewerthan 3 elbows are used, the maximum linear pipelength allowed is still 50 feet (15.2m).Term DescriptionPipe Single-wall galvanized steel pipe, 24 gaugeminimum (either insulated or non-insulated)Joint Sealing Permanent duct tape or aluminum tapeTable 4. Required Combustion Air Piping Material.The connection for the intake air pipe is onthe filter box. The Fire Coil 85 appliances may haveventing and combustion air ducting attached to the topor the back. They are shipped with the connectionsat the top. For attaching either or both pipes to theback, the mounting flanges are reversible by removingthe mounting screws and orienting the flanges in thedesired position. Replace the screws after positioningflanges. Run a bead of silicone around the collar andslide the pipe over the collar. Secure with sheet metalscrews.In addition to air needed for combustion, airshall also be supplied for ventilation, including all airrequired for comfort and proper working conditionsfor personnel. The Fire Coil 85 loses less than 1percent of its input rating to the room, but other heatsources may be present.2.2 Venting2.2.1 Vent CategoriesDepending upon desired Fire Coil 85 venting,it may be considered a Category I or a Category IIIappliance. In general, a vertical vent system will bea Category I system. However, in rare instances, aFire Coil 85’s vertical vent system may be consideredCategory III. In the U.S., the National Fuel Gas Code(ANSI Z223.1), or in Canada the Natural Gas andPropane Installation Code (CSA B149.1), defines aCategory I vent system, and includes rules and tablesto size these vent systems. If the Fire Coil 85’s verticalvent system does not satisfy the criteria for Category Iventing, it must be vented as a Category III system.All Fire Coil 85 vent systems which dischargehorizontally (without the use of a power venter) areconsidered Category III vent systems.2.2.2 Category I VentWhen vented as a Category I appliance, thevent system must conform to the National Fuel GasCode (ANSI Z223.1-Latest Edition) in the U.S., or inCanada, to the Natural Gas and Propane InstallationCode (CSA B149.1 latest edition). The vent systemmust be sized and installed for a Category I Fan-Assisted Appliance.If chimney height is greater than 25 feet, orif multiple units are vented into the same verticalvent, a barometric damper must be installed on eachappliance, such that the flue draft does not exceed(negative) 0.1 in. w.c.If using a power venter for any type of CategoryI venting, the draft should be set between (negative)0.01 and 0.05 in. w.c.2.2.3 Common Venting SystemsFire Coil 85 units are Category I fan-assistedwhen vented vertically and adhering to all applicablecodes. Fire Coil 85 units are not allowed to be ventedinto a common horizontal vent system, unless aproperly sized vent fan is used, and the commonvent system is properly designed by the vent fanman u fac tur er or a qualified engineer. When commonventing Fire Coil 85 fan-assisted unit with otherappliances through one shared vertical duct called a“common vent”, special care must be taken by theinstaller to ensure safe operation. In the event thatthe common vent is blocked, it is possible, especiallyfor fan-assisted devices, to vent backwards throughnon-operating appliances sharing the vent, allowingcom bus tion products to infiltrate occupied spaces.If the appliances are allowed to operate in thiscon di tion, serious injury or death may occur.WARNINGOperation of appliances with a blocked commonvent may lead to serious injury or death. Safetydevices must be implemented to prevent blockedcommon vent operation. If safe operation of allappliances connected to a common vent cannotbe assured, including prevention of spillage of fluegasses into living spaces, common venting shouldnot be applied, and appliances should each bevented separately. |
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