56080 / 27 C/ 16 CA06745Fig. 3 -- Return Air TemperatureCODES AND STANDARDSFollow all national and local codes and standards in additionto these instructions. The installation must comply withregulations of the serving gas supplier, local building, heating,plumbing, and other codes. In absence of local codes, theinstallation must comply with the national codes listed below andall authorities having jurisdiction.In the United States, follow all codes and standards for thefollowing:Step 1 — SafetyNational Fuel Gas Code (NFGC) NFPA 54--2012/ANSIZ223.1--2012 and the Installation Standards, Warm Air Heatingand Air Conditioning Systems ANSI/NFPA 90BStep 2 — General InstallationCurrent edition of the NFGC and the NFPA 90B. For copies,contact the National Fire Protection Association Inc.,Batterymarch Park, Quincy, MA 02269; (www.NFPA.org) or foronly the NFGC, contact the American Gas Association, 400 N.Capitol Street, N.W., Washington DC 20001 (www.AGA.org.)Step 3 — Combustion and Ventilation AirSection 9.3 of the NFGC, NFPA 54/ ANSI Z223.1--2012 Air forCombustion and VentilationStep 4 — Duct SystemsAir Conditioning Contractors Association (ACCA) Manual D,Sheet Metal and Air Conditioning Contractors NationalAssociation (SMACNA), or American Society of Heating,Refrigeration, and Air Conditioning Engineers (ASHRAE) 2001Fundamentals Handbook Chapter 34 or 2000 HVAC Systemsand Equipment Handbook Chapters 9 and 16.Step 5 — Acoustical Lining and Fibrous Glass DuctCurrent edition of SMACNA and NFPA 90B as tested by ULStandard 181 for Class I Rigid Air DuctsStep 6 — Gas Piping and Gas Pipe Pressure TestingNFPA 54 / ANSI Z223.1--2012; chapters 5, 6, 7, and 8 andNational Plumbing CodesStep 7 — Electrical ConnectionsNational Electrical Code (NEC) ANSI/NFPA 70--2008Step 8 — VentingNFGC; NFPA 54 / ANSI Z223.1--2012 chapters 12 and 13ELECTROSTATIC DISCHARGE (ESD)PRECAUTIONS PROCEDUREFURNACE RELIABILITY HAZARDImproper installation or service of furnace may causepremature furnace component failure.Electrostatic discharge can affect electronic components.Follow the Electrostatic Discharge Precautions Procedurelisted below during furnace installation and servicing toprotect the furnace electronic control. Precautions willprevent electrostatic discharges from personnel and handtools which are held during the procedure. Theseprecautions will help to avoid exposing the control toelectrostatic discharge by putting the furnace, the control,and the person at the same electrostatic potential.CAUTION!1. Disconnect all power to the furnace. Multiple disconnectsmay be required. DO NOT TOUCH THE CONTROL ORANY WIRE CONNECTED TO THE CONTROL PRIORTO DISCHARGING YOUR BODY’SELECTROSTATIC CHARGE TO GROUND.2. Firmly touch the clean, unpainted, metal surface of the fur-nace chassis which is close to the control. Tools held in aperson’s hand during grounding will be satisfactorily dis-charged.3. After touching the chassis, you may proceed to service thecontrol or connecting wires as long as you do nothing torecharge your body with static electricity (for example;DO NOT move or shuffle your feet, do not touch un-grounded objects, etc.).4. If you touch ungrounded objects (and recharge your bodywith static electricity), firmly touch a clean, unpaintedmetal surface of the furnace again before touching controlor wires.5. Use this procedure for installed and uninstalled (ungroun-ded) furnaces.6. Before removing a new control from its container, dis-charge your body’s electrostatic charge to ground to pro-tect the control from damage. If the control is to be in-stalled in a furnace, follow items 1 through 4 beforebringing the control or yourself in contact with the fur-nace. Put all used and new controls into containers beforetouching ungrounded objects.7. An ESD service kit (available from commercial sources)may also be used to prevent ESD damage.58CT