Vent Termination - Carrier 58SMA Operating Instructions Manual

10. After pipes have been cut and preassembled, apply generous
layer of cement primer to pipe fitting socket and end of pipe
to insertion mark. Quickly apply approved cement to end of
pipe and fitting socket (over primer). Apply cement in a light,
uniform coat on inside of socket to prevent buildup of excess
cement. Apply second coat.
11. While cement is still wet, twist pipe into socket with 1/4 turn.
Be sure pipe is fully inserted into fitting socket.
12. Wipe excess cement from joint. A continuous bead of cement
will be visible around perimeter of a properly made joint.
13. Handle pipe joints carefully until cement sets.
14. Support vent piping a minimum of every 5 ft (3 ft for SDR-21
or -26 PVC) using perforated metal hanging strap.
15. Slope vent pipe toward furnace a minimum of 1/4 in. per
linear ft with no sags between hangers.
16. Use appropriate methods to seal openings where vent pipe
passes through roof or sidewall.
EXTENDED EXPOSED SIDEWALL PIPES
Sidewall vent pipe termination may be extended beyond area
shown in Fig. 34 in outside ambient by insulating pipe as indicated
in Table 5.
1. Determine vent pipe diameter, as stated above, using total pipe
length and number of elbows.
2. Find appropriate temperature for your application and furnace
model using winter design temperature (used in load calcula-
tions).
3. Determine required insulation thickness for exposed pipe
lengths.
NOTE: Pipe length (ft) specified for maximum pipe lengths
located in unconditioned spaces cannot exceed total allowable pipe
length as specified in Table 4.
Step 3—Vent Termination
Vent pipe must terminate either through roof or sidewall. See
Table 6 for required clearances. See Fig. 33, 34, and 35 for exterior
piping arrangements.
Table 6—Vent Pipe Termination Clearances
LOCATION
Above grade level or above antici-
pated snow depth
From any mechanical fresh air intake
For furnaces with an input capacity
less than 100,000 Btuh–from any
non-mechanical air supply (windows
or doors which can be opened) or
combustion-air opening
For furnaces with an input capacity
greater than 100,000 Btuh–from any
non-mechanical air supply (windows
or doors which can be opened) or
combustion-air opening
From service regulator vent, electric
and gas meters, and relief equipment
Above grade when adjacent to public
walkway
* 18 in. above roof surface in Canada.
† Located within 10 ft in U.S.A.
‡ Horizontal or below opening. If above opening, 1 ft is allowed.
** Horizontal distance.
†† 36 in. to electric meter in Canada only.
NOTE: When locating vent termination, consideration must be given to
prevailing winds, location, and other conditions which may cause nuisance
outages.
CLEARANCE (FT)
U.S.A. Canada
1 1*
3 above† 6
4‡ 1
4‡ 3
4** 6††
7 7
28
MAINTAIN 12-IN. MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24 IN. ABOVE ROOF.
Fig. 33—Roof Termination (Preferred)
OVERHANG OR ROOF
12" MINIMUM
VENT
90°
Fig. 34—Sidewall Termination with 2 Elbows
(Preferred)
OVERHANG OR ROOF
12" MINIMUM
VENT
Fig. 35—Sidewall Termination with Straight Pipe
ROOF
VENT
A96191
MAINTAIN 12-IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
A96192
6-IN. MINIMUM
CLEARANCE BETWEEN
WALL AND END OF VENT
PIPE.
10-IN. MAXIMUM PIPE LENGTH
MAINTAIN 12-IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
A96210