315AAV
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:
1.Seal any unused openings in venting system.
2.Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, NFPA 54/ANSI
3.As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.
4.Close fireplace dampers.
5.Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.
6.Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously.
7.Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.
8.If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, NFPA 54/ANSI
9.After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other
Vent system or vent connectors may need to be resized. Vent systems or vent connectors must be sized to approach minimum size as determined using appropriate table found in the current edition of NFGC.
General Venting Requirements
Follow all safety codes for proper vent sizing and installation requirements, including local building codes, the National Fuel Gas Code NFPA 54/ANSI
The following information and warning must be considered in addition to the requirements defined in the NFGC.
A00275
Fig. 27 - Two-Stage Furnace with Single-Speed
Air Conditioner
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
Do not bypass the draft safeguard switch, as an unsafe condition could exist which must be corrected.
1.If a vent (common or dedicated) becomes blocked, the fur- nace will be shut off by the draft safeguard switch located on the vent elbow.
2.
3.Do not vent this Category I furnace into a single wall ded- icated or common vent. The dedicated or common vent is considered to be the vertical portion of the vent system that terminates outdoors.
4.Vent connectors serving Category I furnaces shall not be connected into any portion of a mechanical draft system operating under positive pressure.
5.Do not vent this appliance with any solid fuel burning ap- pliance.
6.Category I furnaces must be vented vertically or nearly vertically unless equipped with a listed mechanical venter. See SIDEWALL VENTING section.
7.Do not vent this appliance into an unlined masonry chim- ney. Refer to Chimney Inspection Chart, Fig. 35.
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