14 18-CD33D1-4
Installer’s Guide
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliances
not connected to the common venting system. Turn
on any exhaust fans, such as range hoods and bath-
room exhausts, so they will operate at maximum
speed. Do not operate a summer exhaust fan, close
fireplace dampers.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
5. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the flame of
a match or candle, or smoke from a cigarette, cigar,
or pipe.
6. After it has been determined that each appliance re-
maining connected to the common venting system
properly vents when tested as outlined above, return
door, windows, exhaust fans, fireplace dampers and
any other gas-burning appliance to their previous
conditions of use.
If improper venting is observed during any of the above
tests, the remaining common venting system must be
corrected. Correction of the remaining common vent
system should be done by referring to 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. 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.
GENERAL VENTING
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-PRES-
SURE 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 conden-
sate and prevent deterioration of the vent system.
American Gas Association has certified the design of
condensing furnaces for a minimum of 0" clearance from
combustible 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 7, page 12).
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
system serving other gas appliances, the venting sys-
tem is likely to be too large to properly vent the remain-
ing attached appliances.
The following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances remaining
connected to the common venting system are not in op-
eration.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no block-
age or restriction, leakage, corrosion or other defi-
ciencies which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
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. 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 combustion air requirements are met. (See AIR FOR COMBUSTION AND VENTILATION)
To Next Page
Loading...
Need help?
General