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880TB/881TB: Installation, Start–Up, Operating and Service and Maintenance Instructions
liner, Type-B vent, or a listed chimney adapter kit shall be used to
reduce condensation. If a condensate drain is required by local
code, refer to the NFPA 54/ANSI Z223.1, Section 12.10 for
additional information on condensate drains.
b. Indicates the chimney exceeds the maximum permissible size in
the tables, the chimney should be rebuilt or relined to conform to
the requirements of the equipment being installed and the
authority having jurisdiction.
A chimney without a clay tile liner, which is otherwise in good
condition, shall be rebuilt to conform to ANSI/NFPA 211 or be lined
with a UL listed metal liner or UL listed Type-B vent. Relining with a
listed metal liner or Type-B vent is considered to be a vent-in-a-chase.
If a metal liner or Type-B vent is used to line a chimney, no other
appliance shall be vented into the annular space between the chimney
and the metal liner.
Appliance Application Requirements
Appliance operation has a significant impact on the performance of the
venting system. If the appliances are sized, installed, adjusted, and
operated properly, the venting system and/or the appliances should not
suffer from condensation and corrosion. The venting system and all
appliances shall be installed in accordance with applicable listings,
standards, and codes.
The furnace should be sized to provide 100 percent of the design heating
load requirement plus any margin that occurs because of furnace model
size capacity increments. Heating load estimates can be made using
approved methods available from Air Conditioning Contractors of
America (Manual J); American Society of Heating, Refrigerating, and
Air-Conditioning Engineers; or other approved engineering methods.
Excessive oversizing of the furnace could cause the furnace and/or vent
to fail prematurely.
When a metal vent or metal liner is used, the vent must be in good
condition and be installed in accordance with the vent manufacturer's
instructions.
To prevent condensation in the furnace and vent system, the following
precautions must be observed:
1. The return-air temperature must be at least 60°F db except for brief
periods of time during warm-up from setback at no lower than 55°F
(13°C) db or during initial start-up from a standby condition.
2. Adjust the gas input rate per the installation instructions. Low gas
input rate causes low vent gas temperatures, causing condensation
and corrosion in the furnace and/or venting system. Derating is
permitted only for altitudes above 2000 ft. (610 M).
3. Adjust the air temperature rise to the midpoint of the rise range or
slightly above. Low air temperature rise can cause low vent gas
temperature and potential for condensation problems.
4. Set the thermostat heat anticipator or cycle rate to reduce short
cycling.
CAUTION
!
BURN HAZARD
Failure to follow this caution may result in personal injury.
Hot vent pipe is within reach of small children when installed in
downflow position.
See the following instruction.
Air for combustion must not be contaminated by halogen compounds
which include chlorides, fluorides, bromides, and iodides. These
compounds are found in many common home products such as
detergent, paint, glue, aerosol spray, bleach, cleaning solvent, salt, and
air freshener, and can cause corrosion of furnaces and vents. Avoid using
such products in the combustion-air supply. Furnace use during
construction of the building could cause the furnace to be exposed to
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
halogen compounds, causing premature failure of the furnace or venting
system due to corrosion.
Vent dampers on any appliance connected to the common vent can cause
condensation and corrosion in the venting system. Do not use vent
dampers on appliances common vented with this furnace.
Additional Venting Requirements
A 4-in. (102 mm) round vent elbow is supplied with the furnace. A 5-in.
(127 mm) or 6- in. (152 mm) vent connector may be required for some
model furnaces. A field-supplied 4-in. (102 mm) to 5-in. (127 mm) or
4-in. (102 mm) to 6-in. (152 mm) sheet metal increaser fitting is required
when 5-in. (127 mm) or 6-in. (152 mm) vent connector is used. Refer to
Table 12
to determine the minimum vertical vent height for various
furnace and vent orientations. See
for approved vent configurations.
NOTE: Vent connector length for connector sizing starts at furnace vent
elbow. The 4-in. (102 mm) vent elbow is shipped for upflow
configuration and may be rotated for other positions. Remove the three
screws that secure vent elbow to furnace, rotate furnace vent elbow to
position desired, reinstall screws. The factory-supplied vent elbow does
NOT count as part of the number of vent connector elbows.
The vent connector can exit the furnace through one of five locations on
the casing.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts, and servicing furnaces.
1. Attach the single wall vent connector to the furnace vent elbow, and
fasten the vent connector to the vent elbow with at least two
field-supplied, corrosion-resistant, sheet metal screws located 180°
apart.
NOTE: An accessory flue extension is available to extend from the
furnace elbow to outside the furnace casing. See Product Data Sheet for
accessory listing. If flue extension is used, fasten the flue extension to
the vent elbow with at least two field-supplied, corrosion-resistant, sheet
metal screws located 180° apart. Fasten the vent connector to the flue
extension with at least two field-supplied, corrosion resistant sheet metal
screws located 180° apart.
2. Vent the furnace with the appropriate connector, see
Fig.
44)
3. Determine the correct location of the knockout to be removed.
4. Use a hammer and screwdriver to strike a sharp blow between the
tie points and work the slug back and forth until the slug breaks
free.
An accessory Vent Guard Kit is REQUIRED for downflow applications
for use where the vent exits through the lower portion of the furnace
casing. Refer to the Vent Guard Kit Instructions for complete details. See
Product Data Sheet for accessory listing.
The horizontal portion of the venting system shall slope upwards not less
than 1/4-in. per linear ft. (21 mm/m) from the furnace to the vent and
shall be rigidly supported every 5 ft. (1.5 M) or less with metal hangers
or straps to ensure there is no movement after installation.
Sidewall Venting
This furnace is not approved for direct sidewall horizontal venting.
Per section 12.4.3 of the NFPA 54/ANSI Z223.1, any listed mechanical
venter may be used, when approved by the authority having jurisdiction.
Select the listed mechanical venter to match the BTUh input of the
furnace
being
vented.
requirements for venting and termination included with the listed
mechanical venter.
23
Fig. 32
-
Fig. 44
Venting Orientation
CAUTION
Follow
all
manufacturer's
Fig. 32
-
installation
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