80 
/ 27 C
60
/ 16 C
A06745
Fig. 3 - Return Air Temperature
CODES AND STANDARDS
Follow all national and local codes and standards in addition to these instructions. The installation must comply with regulations of the serving gas supplier, local building, heating, plumbing, and other codes. In absence of local codes, the installation must comply with the national codes listed below and all authorities having jurisdiction.
In the United States, follow all codes and standards for the following:
Step 1 — Safety
National Fuel Gas Code (NFGC) NFPA
Step 2 — General Installation
Current 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 for only the NFGC, contact the American Gas Association, 400 N. Capitol Street, N.W., Washington DC 20001 (www.AGA.org.)
Step 3 — Combustion and Ventilation Air
Section 9.3 of the NFGC, NFPA 54/ ANSI
Step 4 — Duct Systems
Air Conditioning Contractors Association (ACCA) Manual D, Sheet Metal and Air Conditioning Contractors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) 2001 Fundamentals Handbook Chapter 34 or 2000 HVAC Systems and Equipment Handbook Chapters 9 and 16.
Step 5 — Acoustical Lining and Fibrous Glass Duct
Current edition of SMACNA and NFPA 90B as tested by UL Standard 181 for Class I Rigid Air Ducts
Step 6 — Gas Piping and Gas Pipe Pressure Testing
NFPA 54 / ANSI
Step 7 — Electrical Connections
National Electrical Code (NEC) ANSI/NFPA
Step 8 — Venting
NFGC; NFPA 54 / ANSI
ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS PROCEDURE
!CAUTION
FURNACE RELIABILITY HAZARD
Improper installation or service of furnace may cause premature furnace component failure.
Electrostatic discharge can affect electronic components. Follow the Electrostatic Discharge Precautions Procedure listed below during furnace installation and servicing to protect the furnace electronic control. Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the procedure. These precautions will help to avoid exposing the control to electrostatic discharge by putting the furnace, the control, and the person at the same electrostatic potential.
1.Disconnect all power to the furnace. Multiple disconnects may be required. DO NOT TOUCH THE CONTROL OR ANY WIRE CONNECTED TO THE CONTROL PRIOR
TO DISCHARGING YOUR BODY’S ELECTROSTATIC 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 a person’s hand during grounding will be satisfactorily dis- charged.
3.After touching the chassis, you may proceed to service the control or connecting wires as long as you do nothing to recharge 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 body with static electricity), firmly touch a clean, unpainted metal surface of the furnace again before touching control or 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 before bringing the control or yourself in contact with the fur- nace. Put all used and new controls into containers before touching ungrounded objects.
7.An ESD service kit (available from commercial sources) may also be used to prevent ESD damage.
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