SYSTEM OPERATION
12
PROVIDE 8" MINIMUM CLEARANCE BETWEEN
CENTER ROD AND FURNACE CABINET TO
ALOW FOR CIRCULATOR BLOWER REMOVAL.
ALTERNATE
GAS PIPING
ASSURE FURNACE IS LEVEL FROM
END TO END. ON 90% FURNACES
MAKE SURE THE UNIT HAS A
SLIGHT FORWARD TILT WITH THE
FRONT OF THE FURNACE 0"-3/4"
BELOW THE BACK OF THE
FURNACE.
CONDENSATE
DRAIN
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR
BLOWER REMOVAL
POSITION AS CLOSE AS
POSSIBLE TO BLOWER DECK TO
ALLOW FOR CIRCULATOR
BLOWER REMOVAL.
2"x2"x1/8" ANGLE IRON
(3 PLACES)
GAS PIPING
SUPPORT
NUTS
HOLD DOWN
NUTS
3/8" DIAMETER
THREADED ROD
(6 PLACES)
Suspended Furnace
Existing Furnace Removal
NOTE:
When an existing furnace is removed from a venting
system serving other appliances,
the venting system may be
too large to properly vent the remaining attached appliances.
The following vent testing procedure is repro duced from the
American National Standard/National Standard of Can
-
ada for Gas-Fired Central Furnaces ANSI Z21.47, latest
edition, CSA-2.3b, 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:
a. Seal any unused openings in the venting system;
b. Inspect the venting system for proper size and
horizontal pitch, as required by the National
Fuel Gas Code, ANSI Z223.1 or the CSA B149
Installation Codes and these instructions. De-
termine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which
could cause an unsafe condition.
c. In so 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. 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. Close fireplace dampers;
d. Follow the lighting instructions. Place the appli-
ance being inspected in operation. Adjust ther-
mostat so appliance shall operate continuously;
e. Test for draft hood equipped spillage at the draft
hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or
candle.
f.
After it has been determined that each appli-
ance connected to the venting system properly
vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace damp
-
ers and any other gas burning appliance to their
previous conditions of use;
g. If improper venting is observed during any of
the above tests, the common venting system
must be corrected.
Corrections must be in accordance with the latest edition of
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSA B149 Installation Codes.
If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edi
-
tion of the National Fuel Gas Code ANSI Z223.1 and/or
CSA B149
Installation Codes.
Thermostat Requirements
A high quality single stage thermostat with a common termi-
nal is recommended.
Thermostat Location
In an area having good air circulation, locate the thermostat
and dehumidistat (if applicable) about five feet high on a vi
-
bration-free inside wall. Do not install the thermostat or dehu-
midistat 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 and
dehumidistat, such as an outside wall.
Consult the instructions packaged with the thermostat and de-
humidistat for mounting instructions and further precautions.
COMBUSTION AND VENTILATION AIR
REQUIREMENTS
WARNING
Possible property damage, personal injury or death may oc
-
cur if the furnace is not provided with enough fresh air for
proper combustion and ventilation of flue gases. Most homes
require outside air be supplied to the furnace area.
Improved construction and additional insulation in build-
ings 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.
