Appliance Application Requirements - Carrier 58CVA Installation, Start-Up, Operating And Service And Maintenance Instructions

Exterior Masonry Chimney
FAN + NAT Installations with
Type-B Double-Wall Vent Connectors
Table A—Combined Appliance
Maximum Inut Rating in
Thousands of BTU per Hour
INTERNAL AREA OF CHIMNEY
VENT
HEIGHT (FT)
12
6 74
8 80
10 84
15 NR
20 NR
30 NR
Table B-Minimum Allowable Input Rating of
Space-Heating Appliance in
Thousands of BTU per Hour
VENT
HEIGHT (FT)
12
Local 99% Winter Design
Temperature: 17 to 26 degrees F*
6 0
8 52
10 NR
15 NR
20 NR
30 NR
Local 99% Winter Design
Temperature: 5 to 16 degrees F*
6 NR
8 NR
10 NR
15 NR
20 NR
30 NR
Local 99% Winter Design
Temperature: -10 to 4 degrees F*
6 NR
8 NR
10 NR
15 NR
20 NR
30 NR
Local 99% Winter Design
Temperature: -11 degrees F or lower*
*The 99% Winter Design Dry-Bulb (db) temperatures are found in the 1993
ASHRAE Fundamentals Handbook, Chapter 24, Table 1 (United States) and
2 (Canada), or use the 99.6% heating db temperatures found in the 1997 or
2001 ASHRAE Fundamentals Handbook, Climatic Design Information chap-
ter, Table 1A (United States) and 2A (Canada).
Inspections before the sale and at the time of installation will
determine the acceptability of the chimney or the need for repair
and/or (re)lining. Refer to the Fig. 33 to perform a chimney
inspection. If the inspection of a previously used tile-lined chim-
ney:
a. Shows signs of vent gas condensation, the chimney should
be relined in accordance with local codes and the authority
(SQ. IN.)
19 28 38
119 178 257
130 193 279
138 207 299
152 233 334
NR 250 368
NR NR 404
INTERNAL AREA OF CHIMNEY
(SQ. IN.)
19 28
55 99 141
74 111 154
90 125 169
NR 167 212
NR 212 258
NR NR 362
78 121 166
94 135 182
111 149 198
NR 193 247
NR NR 293
NR NR 377
NR 145 196
NR 159 213
NR 175 231
NR NR 283
NR NR 333
NR NR NR
Not recommended for any vent
configuration
having jurisdiction. The chimney should be relined with a
listed metal 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 NFGC, Section
7.9 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 (ULC listed in Canada) 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
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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 Condi-
tioning Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air-Conditioning Engineers; or other
approved engineering methods. Excessive oversizing of the fur-
nace 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 manufac-
turer'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 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.
3. Adjust the air temperature rise range to the midpoint 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.
Air for combustion must not be contaminated by halogen com-
pounds 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 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.
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