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2. Adjust the gas input rate per the installation instructions. Low gas input rate causes low vent gas temperatures, ca using condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above 2000'1 3. Adjust the air temperature rise to the midpoint of the rise range or slightly above. Low air temperature rise ca n ca use low vent gas temperature and potential for condensation problems. 4. Set the thermostat heat anticipator or cycle rate to reduce short cycling. Air for combustion must not be contaminated by halogen com pounds which include chlorides, fluorides, bromides, and iodides. These compounds are found in many common home products such as detergent, paint, glue, aerosol spray, bleach, cleaning sol vent, salt, and air freshener, and can cause corrosion of furnaces and vents. Avoid using such products in the combustion-air sup ply. Furnace use during construction of the building could cause the furnace to be exposed to halogen compounds, causing prema ture failure of the furnace or ventincj_stem due to corrosion. Ventdampersonanyapplianceto the common vent connected can cause condensation and corrosion in the venting system. Do not use vent dampers on appliances common vented with this furnace. 8. Gas Supply and Piping Gas Piping Requirements NOTE: The gas supply line must be installed by a qualifted service CARBON MONOXIDE POISONING, FIRE AND technician in accordance with all building codes. EXPLOSION HAZARD. NOTE: In the state of Massachusetts. Failure to follow safety warnings exactly could a. Gas supply connections MUST be performed by a li- result in serious injury, death, and/or property censed plumber or gas fitter). damage. b. When flexible connectors are used, the maximum length Models designated for Natural Gas are to be used shall not exceed 36" (915 mm). with Natural Gas ONLY, unless properly converted to c. When lever handle type manual equipment shutoff use with LP gas. valves are used, they shall be T-handle valves. d. The use ofcopper tubing for gas piping is NOT approved. Gas Supply Requirements 1. Install gas piping in accordance with local codes, or in the ab• Use only the Type of gas approved for this furnace. See rating sence of local codes, the applicable national codes. plate for approved gas type. 2. It is recommended that a manual equipment shutoff valve be • Gas input must not exceed the rated input shown on the rating installed in the gas supply line outside the furnace. Locate plate. Overfiring will result in failure of heat exchanger and valve as close to the furnace as possible where it is readily accause dangerous operation. cessible. Refer to Figure 12. Do not allow minimum supply pressure to vary downward. Doing so will decrease input to furnace. Refer to Table 3 for gas supply. Refer to Table 6 and Table 7 for manifold pressures. FIRE HAZARD Failure to follow safety warnings exactly could I Gas Pressures result in death or personal injury. Supply Pressure Gas Type Use wrench to hold furnace gas control valve when Recommended Max. Min, turning elbows and gas line to prevent damage to Natural 7" 14" 4.5" the gas control valve and furnace. Propa ne 11" 14" 11" Typical Gas Piping (N8MP) Drip Leg and Union, Union* should be outside the Manual shut-off cabinet. Manual shut-off valve MUST be upstream of dripleg, union, and furnace. valve Alterative Use elbows and 3" pipenippleto connectvalveto piping when using right side gas pipeentry. _. LP Low pressure 3'_pipe switch. 25-24-86 * Union may be installed inside the cabinet when necessary because of clearances. 3. Useblackironorsteelpipeandfittingsorotherpipeapproved 4. Use pipe thread compound which is resistant to natural and by local code. LP gases. _] 441 01 261302 5, Use ground joint unions and install a drip leg no less than 3" long to trap dirt and moisture before it can enter gas control valve inside furnace. 6, Provide a 1/8" NPT plugged tapping for test gauge connection immediately up stream of gas supply connection to furnace. 7. Use two pipe wrenches when making connections to prevent furnace gas control valve from turning. NOTE: If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector which has previously served another gas appliance. 8. Flexible corrugated metal gas connector may NOT be used inside the furnace or be secured or supported by the furnace or ductwork. 9. Properly size gas pipe to handle combined appliance load or run gas pipe directly from gas meter or LP gas regulator. 10. Install correct pipe size for run length and furnace rating. 11. Measure pipe length from gas meter or LP second stage regulator to determine gas pipe size. Right Side Gas Supply Piping (N8MP) Gas line can be installed directly to the gas valve through the hole provided in the right side of the cabinet. See Figure 12 Left Side Gas Supply Piping (N8MP) Two(2) 90 ° street elbows or two(2) 90 ° standard elbows and two(...

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