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Figure 1
Existing Furnace Removal
The following vent testing procedure is reproduced from
the
American National Standard/National Standard of
Canada for Gas-Fired Central Furnaces ANSI Z21.47,
CSA-2.3 latest edition Section 1.23.1.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the 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 by the National Fuel
Gas Code, ANSI Z223.1 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 shall operate at maximum speed. Do not
operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance shall operate continuously.
7. 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.
8. 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
burning appliance to their previous conditions of use.
If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code ANSI Z223.1 Installation
Codes.
Thermostat Location
The thermostat should be placed approximately five feet
from the floor on a vibration-free, inside wall in an area
having good air circulation. Do not install the thermostat
where it may be influenced by any of the following:
•
Drafts, or dead spots behind doors, in corners, or
under cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
•
Light fixtures or other appliances.
•
Radiant heat from a fireplace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat, such as
an outside wall.
Consult the instructions packaged with the thermostat for
mounting instructions and further precautions.
COMBUSTION & VENTILATION AIR
REQUIREMENTS
WARNING
To avoid property damage, personal injury or death, suffi
-
cient fresh air for proper combustion and ventilation of
flue gases must be supplied. Most homes require outside air
be supplied into the furnace area.
Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and
escape around doors and windows. These changes have
helped in reducing heating/cooling costs but have created
a problem supplying combustion and ventilation air for
gas fired and other fuel burning appliances. Appliances
that pull air out of the house (clothes dryers, exhaust
fans, fireplaces, etc.) increase the problem by starving
appliances for air.
House depressurization can cause back drafting or
improper combustion of gas-fired appliances, thereby
exposing building occupants to gas combustion products
that could include carbon monoxide.
If this furnace is to be installed in the same space with
other gas appliances, such as a water heater, ensure there
is an adequate supply of combustion and ventilation air for
all appliances. Refer to the latest edition of the National
Fuel Gas Code NFPA 54/ANSI Z223.1 or applicable
provisions of the local building codes for determining the
combustion air requirements for the appliances.
Most homes will require outside air be supplied to the
furnace area by means of ventilation grilles or ducts
connecting directly to the outdoors or spaces open to the
outdoors such as attics or crawl spaces.
