Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

Page: 13 / 36

506307-01 Page 13 of 36 Issue 1207
3. Never reduce the pipe size below the outlet size of the
furnace without checking the applicable sections of the
(U.S.) National Fuel Gas Code ANSI Z223.1/NFPA54,
and/or CSA B149.1 Natural Gas and Propane Installa-
tion Codes.
4. All pipe should be supported using the proper clamps
and/or straps. These supports should be at least every
four (4’) feet.
5. All horizontal runs of pipe should have at least a 1/4” (in.)
per foot of upward slope from the furnace to the vent
terminal.
6. All runs of pipe should be as short as possible with as few
turns as possible.
7. Seams should be tightly joined and checked for leaks.
8. The flue pipe must not extend into the chimney but be
flush with the inside wall.
9. The chimney or vent pipe must extend at least three (3’)
feet above the highest point where it passes through a roof
of a building and at least two (2’) feet higher than any portion
of a building within a horizontal distance of ten (10’) feet. It
shall also extend at least five (5’) feet above highest
connected equipment flue collar.
Checking For Vent Oversizing :
If this furnace is replacing a furnace that is attached to a
venting system serving other appliances, the venting system
is likely to be too large to properly vent all of the attached
appliances. An improperly sized venting system can lead to
condensation, leakage, or spillage.
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 common venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and Propane Installation Codes and these instructions.
Determine that there is no blockage or restriction, leakage, corrosion, or 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 applicance being inspected in 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, ANSI Z223.1/NFPA 54 and/or the CSA B149.1, Natural Gas and Propane
Installation Codes.
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.
CARBON MONOXIDE POISONING HAZARD
WARNING