14 18-CD29D1-11
Installer’s Guide
GENERAL VENTING
IMPORTANT:
These furnaces may be installed as Direct Vent (sealed
combustion) or as Nondirect vent (single pipe). The furnac-
es are shipped DIRECT VENT with sealed combustion.
For DIRECT VENT APPLICATION: The furnaces must
be vented to the exterior of the house and combustion air
MUST come through the inlet air pipe FROM OUTSIDE
AIR.
For NONDIRECT VENT APPLICATION: The furnace shall
be vented to the exterior of the house, but combustion air
may enter from the surrounding area as long as combus-
tion air requirements are met. (See AIR FOR COMBUS-
TION AND VENTILATION)
THIS FURNACE MUST BE VENTED TO THE OUT-
DOORS. THESE FURNACES ARE INDUCED DRAFT
VENTED AND MUST NOT BE CONNECTED TO ANY
VENT SERVING ANOTHER APPLIANCE. PLEASE
NOTE THAT THESE FURNACES USE POSITIVE-
PRESSURE VENT SYSTEMS.
Proper venting is essential to obtain maximum efficiency
from a condensing furnace. Proper installation of the vent
system is necessary to assure drainage of the condensate
and prevent deterioration of the vent system.
American Gas Association has certified the design of con-
densing furnaces for a minimum of 0" clearance from com-
bustible materials with a single wall plastic vent pipe.
The recommended system is assembled from 2", 2-1/2", or
3" plastic pipe and fittings (See Table 10, page 16). Where
the system is routed to the outdoors through an existing
masonry chimney containing flue products from another
gas appliance, or where required by local codes, then 3"
venting of Type 29-4C stainless steel must be used in place
of PVC material.
These furnaces have been classified as CATEGORY
IV furnaces in accordance with the latest edition of
ANSI Z21.47 • CAN/ CGA-2.3 Standards. Category IV fur-
naces operate with positive vent pressure and with a vent
gas temperature less than 140°F above the dewpoint. These
conditions require special venting systems, which must be
gas tight and water tight.
NOTE:
When an existing furnace is removed from a venting sys-
tem serving other gas appliances, the venting system is
likely to be too large to properly vent the remaining at-
tached appliances.
IMPORTANT
These Furnaces may be installed as Direct Vent
(sealed combustion) or as Nondirect Vent (single pipe).
The Furnaces are shipped DIRECT VENT with sealed
combustion.
The following are general steps to be used to correct or resize
a remaining vent system when a furnace which may not be
common vented is removed from the system:
a. Determine the Btu per hour input of all remaining
appliances attached to the venting system.
b. Determine the diameter, rise, and lateral of the ex-
isting venting system, as well as quantity and type
of bends.
c. Use the appropriate tables in the latest edition of
the National Fuel Gas Code (ANSI Z223.1 • CAN/
CGA B149.1 Installation Codes or “Exhibit J” of
ANSI Z21.47 • CAN/ CGA-2.3 Standards. “Exhibit J”
includes examples and drawings of typical venting
systems.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all 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 in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CSA B149.1
Natural Gas and Propane Installation Code and these
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 deficiencies which could cause an
unsafe condition.
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 are operating at maximum speed. Do not operate
a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes of main
burner operation. Use the flame 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
Z221.1/NFPA 54 and/or CSA B149.1 Natural Gas and
Propane Installation Code.
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, fireplace dampers and any other gas-fired
burning appliance to their previous conditions of use.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
FURNACE MUST BE VENTED PROPERLY. FAILURE TO
FOLLOW THE INSTALLATION INSTRUCTIONS FOR THE
VENTING SYSTEM COULD RESULT IN CARBON MONOXIDE
POISONING, FIRE OR SMOKE THAT CAN CAUSE SERIOUS
BODILY INJURY, DEATH OR PROPERTY DAMAGE.
IMPORTANT:
The building owner/maintenance provider must keep the
area around the vent clear from snow.
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