SYSTEM OPERATION
8
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow 0"
0"
3" NC 0" 1"
Horizontal 6" 0" 3" C 0" 6"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
*CVC96 M INIM UM CLEARANCES TO COM BUSTIBLE MATERIALS
(INCHES)
TOP
BOTTOM
SIDE SIDE SIDE
TOP
BOTTOM
Upflow Counterflow Horizontal
Figure 1
• Clearances and Accessibility
• For servicing or cleaning, a 24” front clearance is
required.
• 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 clearances from the enclosure where accessibility
clearances are greater.
Installations must adhere to the clearances to combustible
The minimum clearance information for this furnace is
provided on the unit’s clearance label. These clearances
must be permanently maintained. Clearances must also
accommodate an installation’s gas, electrical, and drain trap
and drain line connections. If the alternate combustion air
must be provided to accommodate these connections. Refer
to Vent/Flue Pipe and Combustion Air Pipe for details.
In addition to the required clearances to combustible
materials, a minimum of 24 inches service clearance must be
available in front of the unit.
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:
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 or the Natural Gas and Propane
Installation Code, CAN/CSA B149.1-15 and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deciencies
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 replace 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. Test for spillage from draft hood appliances at the draft
hood relief opening after 5 minutes of main burner
operation. Use the ame 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 and/or National Gas and Propane
Installation Code CAN/CSA B149.1-15.
9. 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, replace 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 and/or
CAN/CSA B149.1-15 Installation Codes.
TO AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH
,
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED. M
OST HOMES REQUIRE OUTSIDE AIR BE
SUPPLIED INTO THE FURNACE AREA.
air circulation. Do not install the thermostat where it may be
• Drafts, or dead spots behind doors, in corners, or under
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