International comfort products F8MVL Installation Instructions Manual page 27

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.
Table 8 – Minimum Allowable Input Rating of
Space−Heating Appliance in Thousands of Btuh per Hour
INTERNAL AREA OF CHIMNEY
VENT HEIGHT
FT. (M)
12
(7741)
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
Not recommended for any vent configuration.
*The 99.6% heating (db) temperatures found in the 1997 or 2001
ASHRAE Fundamentals Handbook, Climatic Design Information chapter, Table
1A (United States) and 2A (Canada) or the 2005 ASHRAE Fundamentals hand-
book, Climatic Design Information chapter, and the CD−ROM included with the
2005 ASHRAE Fundamentals Handbook.
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.
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.
441 01 2122 01
SQ. IN. (SQ. MM)
19 28 38
(12258) 18064) (24516)
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
lower
Specifications are subject to change without notice.
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. See
Figure 35 − Figure 47, Venting Orientation 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.
CAUTION
!
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: A flue extension is recommended to extend from the
furnace elbow to outside the furnace casing. 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 as shown
in Figure 35 − Figure 47.
3. Determine the correct location of the knockout to be re-
moved.
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 door. Refer to the Vent Guard Kit
Instructions for complete details. See Specification Sheet for
accessory listing.
27