International comfort products *8MPL, Installation Instructions Manual

Page: 17 / 44

441 01 2613 05 17
Specifications are subject to change without notice
Exterior Masonry Chimney,
FAN+NAT Installations with
Type ! B Double ! Wall Vent Connectors
!
NFPA & AGA
Table A-
Combined Appliance
Maximum Input Rating in
Thousands of Btu per Hr
VENT
HEIGHT
FT(m)
INTERNAL AREA OF CHIMNEY
SQ IN.(cm)
12(77.4) 19(122.6) 28(180.6) 38(245.2)
6(1.8) 74 119 178 257
8(2.4) 80 130 193 279
10(3) 84 138 207 299
15(4.6) NR 152 233 334
20(6.1) NR NR 250 368
30(9.1) NR NR NR 404
Table B-
Minimum Allowable Input Rating of
Space-Heating Appliance in
Thousands of Btu per Hr
VENT
HEIGHT
FT(m)
INTERNAL AREA OF CHIMNEY
sq. in(cm)
12(77.4) 19(122.6) 28(180.6) 38(245.2)
17 to 26
"
F (
!
8 to
!
3
"
C)
Local 99% Winter Design Temperature:
17 to 26
°
F ( ! 8 to ! 3
°
C)*
6(1.8) 0 55 99 141
8(2.4) 52 74 111 154
10(3) NR 90 125 169
15(4.6) NR NR 167 212
20(6.11) NR NR 212 258
30(9.1) NR NR NR 362
5 t o 16
"
F (
!
15 to
!
9
"
C)
Local 99% Winter Design Temperature:
5 to 16
°
F ( ! 15 to ! 9
°
C)*
6(1.8) NR 78 121 166
8(2.4) NR 94 135 182
10(3) NR 111 149 198
15(4.6) NR NR 193 247
20(6.11) NR NR NR 293
30(9.1) NR NR NR 377
!
10 to 4
"
F (
!
23 to
!
16
"
C)
Local 99% Winter Design Temperature:
! 10 to 4 ° F ( ! 23 to ! 16 ° C)*
6(1.8) NR NR 145 196
8(2.4) NR NR 159 213
10(3) NR NR 175 231
15(4.6) NR NR NR 283
20(6.11) NR NR NR 333
30(9.1) NR NR NR NR
! 11 ° F
( ! 24 ° C)
or lower
Local 99% Winter Design Temperature:
! 11
°
F ( ! 24
°
C) or lower*
Not recommended for any vent configuration
* The 99% Winter Design Dry ! Bulb (db) temperatures are
found in the 2005 ASHRAE Fundamentals Handbook CD
and Chapter 28.
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 Chimney Inspection Chart to
perform a chimney inspection.
If the inspection of a previously used tile ! lined chimney:
a. Shows signs of vent gas condensation, the chimney should
be relined in accordance with local codes and the authority
having jurisdiction. The chimney should be relined with a
listed metal liner, Type ! B vent, or a listed chimney adapter
kit to reduce condensation. If a condensate drain is required
by local code, refer to the ANSI Z223.1/NFPA 54 ! 2009,
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 ! 2006 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 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 or liner must be in
good condition and be installed in accordance with the vent or liner
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 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
′
(610m).
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.
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 halogen
compounds, causing premature failure of the furnace or venting
system due to corrosion.
National Excelsior Company
www.excelsiorhvac.com
Subject to change without notice.