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58SU0A: Installation, Start-up, Operating and Service and Maintenance Instructions
A chimney without a clay tile liner, which is otherwise in good
condition, shall be rebuilt to conform to current edition of 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.
Exterior Masonry Chimney FAN + NAT
Installations with Type-B Double Wall Vent
Connectors ÓNFPA & AGA
Table 8 – Combined Appliance Maximum Input Rating in
Thousands of BTUH per Hour
INTERNAL AREA OF CHIMNEY
VENT HEIGHT
FT. (M)
12
(7741)
74
6 (1.8)
80
8 (2.4)
10 (3.0)
84
15 (4.5)
NR
NR
20 (6.0)
NR
30 (9.1)
Table 9 – Minimum Allowable Input Rating of Space-Heating
Appliance in Thousands of BTUH per Hour
VENT HEIGHT
FT (M)
12
(7741)
Local 99% Winter Design
Temperature: 17 to 26°F
6 (1.8)
0
8 (2.4)
52
10 (3.0)
NR
15 (4.6)
NR
20 (6.1)
NR
30 (9.1)
NR
Local 99% Winter Design
Temperature: 5 to 16°F
6 (1.8)
NR
8 (2.4)
NR
10 (3.0)
NR
15 (4.6)
NR
20 (6.1)
NR
30 (9.1)
NR
Local 99% Winter Design
Temperature: -10 to 4°F
6 (1.8)
NR
8 (2.4)
NR
10 (3.0)
NR
15 (4.6)
NR
20 (6.1)
NR
30 (9.1)
NR
Local 99% Winter Design
Temperature: -11°F (-24°C) or lower
Not recommended for any vent configuration.
*. The 99.6% heating db temperatures table found in the Appendix of the
Climatic Design Information chapter of the 2017 ASHRAE Fundamentals
Handbook.
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
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
IN2 (MM2)
19
28
(12258)
(18064)
(24516)
119
178
130
193
138
207
152
233
NR
250
NR
NR
INTERNAL AREA OF CHIMNEY
2
2
IN
. (MM
)
19
28
(12258)
(18064)
(24516)
*
(-8 to -3°C)
55
99
74
111
90
125
NR
167
NR
212
NR
NR
*
(-15 to -9°C)
78
121
94
135
111
149
NR
193
NR
NR
NR
NR
*
(-23 to -16°C)
NR
145
NR
159
NR
175
NR
NR
NR
NR
NR
NR
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 (16°C)db except
for brief periods of time during warm-up from setback at no lower
38
than 55°F (13°C) db or during initial start-up from a standby
condition.
257
2. Adjust the gas input rate per the installation instructions. Low gas
279
input rate causes low vent gas temperatures, causing condensation
299
and corrosion in the furnace and/or venting system.
334
3. Adjust the air temperature rise to the midpoint of the rise range or
368
slightly above. Low air temperature rise can cause low vent gas
404
temperature and potential for condensation problems.
4. Set the thermostat heat anticipator or cycle rate to reduce short
cycling.
Air for combustion must not be contaminated by halogen compounds
which include chlorides, fluorides, bromides, and iodides. These
38
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
141
construction of the building could cause the furnace to be exposed to
154
halogen compounds, causing premature failure of the furnace or venting
169
system due to corrosion.
212
258
Vent dampers on any appliance connected to the common vent can cause
362
condensation and corrosion in the venting system. Do not use vent
dampers on appliances common vented with this furnace.
ADDITIONAL VENTING REQUIREMENTS
166
A 4" (101 mm) round vent elbow is supplied with the furnace. A 5-inch
182
(127 mm) or 6- inch (152 mm) vent connector may be required for some
198
247
model furnaces. A field-supplied 4-inch-to-5-inch (101 - 127 mm) or
293
4-inch-to-6-inch (101 - 152 mm) sheet metal increaser fitting is required
377
when 5-inch (127 mm) or 6-inch (152 mm) vent connector is used. See
Fig. 26
-
Fig. 31
Venting Orientation for approved vent configurations.
NOTE: Vent connector length for connector sizing starts at furnace vent
196
elbow. The 4-inch vent elbow is shipped for upflow configuration and
213
may be rotated for other positions. Remove the 3 screws that secure vent
231
elbow to furnace, rotate furnace vent elbow to position desired, reinstall
283
screws. The factory-supplied vent elbow does NOT count as part of the
333
NR
number of vent connector elbows.
The vent connector can exit the furnace through one of two locations on
the casing.
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 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
18
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