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441 01 2121 01
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 Requirements
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.
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
furnace will be shut off by the draft safeguard switch
located on the vent elbow.
2. Two−stage furnaces require Type B vent connectors
outside the casing in all configurations. Single wall vent
connector may be used inside the furnace casing with
the transition to Type B vent outside the furnace cas-
ing. Size the connector so that the FAN−Min vent con-
nector capacity is equal to or lower than the low fire
rate of the furnace 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
dedicated 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
appliance.
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
chimney. Refer to Chimney Inspection Chart,
Figure 34.
Figure 27 − Variable Speed Furnace with Single Stage
Air Conditioner
L09F025
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