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For Canadian installations, only the Field Controls
venter and control kit mentioned above are autho-
rized by CSA for use with this furnace.
See Figure 11 for information on where the sidewall vent
terminal can and cannot terminate.
Existing Venting Systems
When an existing Category I furnace is removed or replaced,
the original venting system may no longer be sized to
properly vent the attached appliances. An improperly sized
venting system can result in spillage of flue products into the
living space, the formation of condensate, leakage, etc. See
the WARNING box below for proper test procedure.
Circulating Air Supply
When the furnace is installed so that the supply ducts
carry air circulated by the furnace to areas outside the
space containing the furnace, the return air shall be
handled by a duct or ducts sealed to the furnace casing
and terminated outside the space containing the furnace.
A return air duct system is recommended. If the unit is
installed in a confined space or closet, a return connection
must be run, full size, to a location outside the closet. The
air duct in the closet must be tight to prevent any entrance
of air from the closet into the circulating air.
If there is no complete return air duct system, the return air
connection must be sealed to the furnace casing and run
full size to a location outside the utility room or space
housing the furnace to prevent a negative pressure on the
venting system.
Failure to follow the steps outlined below for each appliance connected to the venting system being placed into opera-
tion 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 common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 (latest edition) 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 between the space in which the appliance(s) connected to the
venting system are located and other spaces in 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 unit 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 (latest edition) and/or the CSA B149.1 Natural Gas and Propane
Installation Codes.
9. After it has been determined that each appliance remaining 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
When an air conditioning unit is used in
conjunction with the furnace, the evaporator
coil must be installed in the discharge (sup-
ply) air. Do not install an evaporator coil in the
return air; excessive condensation will occur
within the furnace.
CAUTION
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