18-CD19D8-18
13
Installer’s Guide
Carbon monoxide, fire or smoke can cause serious bodily
injury, death, and/or property damage.
A variety of potential sources of carbon monoxide can be found
in a building or dwelling such as gas-fired clothes dryers, gas
cooking stoves, water heaters, furnaces and fireplaces. The
U.S. Consumer Product Safety Commission recommends
that users of gas-burning appliances install carbon monoxide
detectors as well as fire and smoke detectors per the
manufacturer’s installation instructions to help alert dwell-
ing occupants of the presence of fire, smoke or unsafe levels of
carbon monoxide. These devices should be listed by Under-
writers Laboratories, Inc.
Standards for Single and Mul-
tiple Station Carbon Monoxide Alarms, UL 2034
or CSA
International Standard,
Residential Carbon Monoxide
Alarming Devices,
CSA 6.19
NOTE:
The manufacturer of your furnace does not test any detec-
tors and makes no representations regarding any brand or
type of detector.
GENERAL VENTING
THIS FURNACE MUST BE VENTED TO THE OUTDOORS.
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 condens-
ing 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 9, page 15). 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 ANSI Z21.47 “latest edition”
standards. Category IV furnaces 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 system is
likely to be too large to properly vent the remaining
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 operation.
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 blockage or
restriction, leakage, corrosion or other deficiencies 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 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 bathroom 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. After it has been determined that each appliance remain-
ing connected to the common venting system properly
vents when tested as outlined above, return door, win-
dows, 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 could require rerouting or resizing the remaining
vent system.
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. The pipes
DO NOT have to exit the exterior of the house together or on
the same side of the house.
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)
FURNACE VENT/INLET PIPE INSTALLATION
There are many different variations of the vent/inlet air pipe
combination. The vent/inlet air combination used for instal-
lation of these furnaces depends on the needs of the location.
However, these guidelines must be followed:
1. The furnace must vent outside the structure.
2. Furnace combustion air requirements must be met for
nondirect, single pipe applications (See example on
next page).
3. For direct vent application of these furnaces, the vent
pipe and air inlet pipe do not have to exit in the same air
space or even on the same surface of the structure.
However, the longest individual pipe will decide the value
for the longest allowable equivalent vent/inlet air length as
shown in the vent length table.
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of incomplete
fuel combustion is believed by the state of California to
cause cancer, birth defects, or other reproductive harm.
▲
WARNING
!