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24
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 Z223.1--2009 and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deficiencies,
which could cause an unsafe condition.
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 Z223.1--2009.
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
gas--fired burning appliance to their previous
conditions of use.
!
WARNING
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 Requir
ements
Follow all safety codes for proper vent sizing and installation
requirements, including local building codes, the National Fuel
Gas Code NFPA 54/ANSI Z223.1--2009 (NFGC), Parts 12 and
13 in the United States, the local building codes, and furnace and
vent manufacturers’ instructions.
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
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.
!
WARNING
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. Two--stage furnaces require Type B vent connectors out-
side the casing in all configurations. Single wall vent con-
nector may be used inside the furnace casing with the
transition to Type B vent outside the furnace casing. Size
the connector so that the FAN--Min vent connector capa-
city is equal to or lower than the low fire rate of the fur-
nace and the FAN--Max vent connector capacity is equal
to or higher than the furnace high fire rate.
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.
315AAV