SYSTEM OPERATION
10
If suspending the furnace from rafters or joist, use 3/8”
threaded rod and 2”x2”x1/8” angle iron as shown in the
a concrete pad. Never install the furnace on the ground or
allow it to be exposed to water. The length of rod will depend
on the application and the clearances necessary.
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR BLOWER
REMOVAL.
3/8" DIAMETER
THREADED R
OD
(6 PLACES)
PROVIDE 8" MINIMU
M
C
LE
A
RA
NC
E BETWEEN
CENTER ROD AND FURNACE CABINET
TO ALLOW FOR CIRCULATOR B
LO
WER REMOVAL.
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.
POSITION AS CLOSE AS POSSIBLE
TO BLOWER DECK TO ALLOW FOR
CIRCULATOR BLOW
ER REMOVAL.
2
"
X
2"
X
1/8"
A
NGLE IRON
(3 PLACES)
HOLD DOWN
NUTS
SUPPORT
NUTS
CONDENSATE
DRAIN
GA
S P
IPI
NG
ALTE
R
NA
TE
G
AS
PI
P
IN
G
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
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.
Determine that there is no blockage or restriction, leakage,
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
dampers;
d. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat 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
f. After it has been determined that each appliance connected
to the venting system properly vents when tested as outlined
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 edition of
the National Fuel Gas Code ANSI Z223.1 and/or CSA B149
Installation Codes.
A two stage heat/cool thermostat is recommended. A single
stage heating thermostat may be used. It is recommended
that a high quality thermostat with a “C” terminal is used to
operate the furnace.
T
In an area having good air circulation, locate the thermostat
the following:
• Drafts, or dead spots behind doors, in corners, or under
cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
•
•
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat and
dehumidistat, such as an outside wall.
B RRT G R JR R T R
T R T R T G R R R RR
BT TT G T RQR
T R B T T R R
Improved construction and additional insulation in buildings
around doors and windows. These changes have helped in
reducing heating/cooling costs but have created a problem
other fuel burning appliances. Appliances that pull air out
increase the problem by starving appliances for air.
When the furnace is installed as a direct ven (2-pipe) furnace,
no special provisions for air for combustion are required.
However, 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
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