Carrier 58PAV - Manual (Page 8)

However, the venting of this furnace into a hned masonry
chimney could result in the formation of flue gas condensate
due to cold surfaces and oversizing. If condensate is present
in the masonry chimney, a drain must be provided to pre­
vent condensate flow into the vent connector and furnace.
Refer to National Fuel Gas Code, Section 7.9 for additional
information on condensate drains. Field experience on
induced-combustion furnaces has shown that venting
through a properly sized Type B-1 vent significantly
reduces the occurrence of vent condensation. Any conden­
sate formed is acidic and could cause corrosion of the vent
materials. Therefore, manufacturer suggests (but does not
require) that these furnaces be connected to vent systems
constructed of Tjq)e B-1 vent material.
A. General Instructions
1. This furnace must be installed in accordance with these
instructions, the National Fuel Gas Code NFPA No.
54-1988/ANSI Z223.1-1988, Canadian CAN/CGA.B149
requirements and aU apphcable local codes, and all
authorities having jurisdiction.
2. This furnace must not be connected to a chimney flue
servicing a separate appliance designed to burn solid
fuel.
3. Never cormect this furnace to a chimney serving a fire­
place, unless the fireplace opening is permanently
sealed off.
4. The recommended vent system for this furnace is con­
structed of Type B-1 double-waU vent pipe (UL or ULC
listed). A minimum 1-in. clearance is required between
Type B-1 vent and combustible materials.
5. It may be necessary to add insulation to Type B-1
double-wall vent and to single-wall vent connector, if
allowed by local codes, in some applications. When
insulation is required it must be at least 1-in. thick
fiberglass with foil backing. Using permanent foil tape,
attach insulation to vent pipe. Both the foil tape and
fiberglass insulation must be suitable for temperatures
up to 350 F.
6. Insulation must be added to any vent connector which
will be exposed to ambient temperatures of 30 degrees
Fahrenheit or less, especially any application using
single-wall vent pipe as a connector.
Add insulation to Type B-1 vent in some applications
as indicated with an asterisk (*) in appropriate tables.
Do not insulate vent pipe exposed to outdoor weather
conditions, (i.e. above roof lines).
7. Do not use a vent size smaller or larger than the size
shown in Tables 6 thru 14.
8. If this furnace is connected to a Hned, masonry chim­
ney, the chimney must be sized and installed according
to the provisions of the National Fuel Gas Code, or
Canadian CAN/CGA.B149 requirements. Vent connec­
tors from the furnace to the chimney should be made
with insulated single-wall vent pipe or Type B-1 vent
pipe. Insulate per Section A.5 when required.
9. Installation of the vent pipe should be as directly as
possible, with a minimum number of turns or elbows.
10. Maintain a minimum of 1/4-in. upward slope per Hnear
ft on all horizontal vent pipe runs.
11. Rigidly support the vent pipe every 5 ft or less with
hangers or straps to ensure that there will be no move­
ment after installation.
12. No portion of the vent system shall extend into, or pass
through, any circulation air duct or plenum.
13. The Type B-1 vent system shall terminate above the
roof surface per the National Fuel Gas Code or CAN/
CGA.B149 requirements, emd shall include a UL or
ULC Hsted vent cap or roof assembly, unless prohib­
ited by local codes.
14. This furnace may be common vented with another fur­
nace or other Hsted gas-fired appHances. Total input
rates of aU appHances wiU determine the vent size. See
Sections C and D for additional information.
15. If a common vent system becomes blocked, the furnace
win be shut off by the draft safeguard switch located
on the inducer assembly.
A WARNING
Do not bsqjass the draft safeguard switch, as an unsafe
condition exists which must be corrected. A failure to
foUow this warning could result in a buildup of carbon
monoxide and lead to personal injury or death.
16. All vent pipe passing through floors, ceiHngs, and waUs
must be instaUed with the proper clearances from com­
bustible material, and be fire-stopped according to the
National Fuel Gas Code requirements and Canadian
Standards CAN/CGA.B149.
17. In replacement instaUation, where an existing vent sys­
tem may be used, the vent system must be inspected
for condition, size, type of vent material, and height to
meet the requirements in these instructions. If the
existing vent system is larger than shown in vent
Tables 6 thru 14, the vent system wfll be oversized, and
condensation cem occur causing corrosion of the vent
system. InstaUation of a replacement vent system may
be required.
18. When removing an existing furnace from a common
vent system, the vent system is likely to be oversized
for the remaining appHances. Refer to Section E for
additional information.
19. Vent connectors or vents servicing Category I appH­
ances shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
20. For instaUation of vent systems not covered in Sec­
tions B, C, and D, or for vent systems with length/
height beyond that shown, refer to the National Fuel
Gas Code for information. FoUowing the National Fuel
Gas code requirements wiU provide for an acceptable
vent system and proper operation of the furnace.
B. Venting Tables For Dedicated Vent System (one
58PAV Furnace)
The foUowing tables eire used to size the vent system for a
58PAV Furnace when using a dedicated vent system. The
information shown in these tables indicate the maximum
horizontal length of vent pipe aUowed for a vent system of a
set height and number of elbows. Some tables include infor­
mation for vent lengths aUowed when insulation is added to
the vent connector and the vent. See Tables 6 thru 11 and
Fig. 11.
1. When single-waU vent pipe is used for vent connector,
it must be insulated as indicated in venting table data
marked with an asterisk {*). Insulation must be added
as specified in Sections A.5 and A.6.
Insulation should be added to any single-waU vent pipe
used as a vent connector, especiaUy those appHcations
with long (over 5 ft) vent connector runs.
2. Each table is for a specific size of furnace depending
upon the rated furnace input.