13
INSTALLATION CONSIDERATIONS
• NC = For installation on non-combustible floors only.
A combustible subbase mus be used for installations on
combustible flooring.
• For servicing or cleaning, a 24" front clearance is recommended.
• Unit connections (electrical, flue, and drain) may necessitate
greater clearances than the minimum clearances listed
above.
• In all cases, accessibility clearance must take precedence over
from the enclosure where accessibility clearances are
greater.
• Approved for line contact in the horizontal position.
F
URNACE
S
USPENSION
If suspending the furnace from rafters or joist, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol-
lowing figure. If the furnace is installed in a crawl space it
must also be suspended from the floor joist or supported by
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.
2" 2" 1/8"
ANGLE
IRON
(3
PLACES
)
X
X
90% Suspended Furnace Shown
E
XISTING
F
URNACE
R
EMOVAL
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 reproduced from the
American National Standard/National Standard of
Canada 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. Determine that there is no blockage or re-
striction, leakage, corrosion and other deficiencies which
could cause an unsafe condition;
c. In so far as practical, close all building doors and win-
dows 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 appliance be-
ing inspected in operation. Adjust thermostat so appli-
ance 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 appliance con-
nected 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;
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.
T
HERMOSTAT
R
EQUIREMENTS
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
HERMOSTAT
L
OCATION
In an area having good air circulation, locate the thermostat
about five feet high on a vibration-free inside wall. Do not
install the thermostat where it may be influenced by any of
the following:
•
Drafts, or dead spots behind doors, in corners, or un-
der 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 de-
humidistat, such as an outside wall.
