Bryant 915SA - Page 43

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3. Chamfer outside edge of pipe for better distribution of
primer and cement.
4. Clean and dry all surfaces to be joined.
5. Check dry fit of pipe and mark insertion depth on pipe.
6. Insert the vent pipe into the vent elbow.
7. Torque clamp on vent elbow 15 lb --in.
8. Torque clamp on vent coupling 15 lb--in.
9. Insert the combustion air pipe into the adapter.
10. Pilot drill a screw hole through the adapter into the combus-
tion air pipe and secure the pipe to the adapter with sheet
metal screws. DO NOT DRILL INTO POLYPROPY-
LENE VENT PIPES. Use an optional accessory vent cou-
pling, if needed.
11. Seal around the combustion air pipe with silicone or foil
tape. SILICONE SEALERS MAY NOT BE APPRO-
PRIATE FOR POLYPROPYLENE VENT SYSTEMS.
SEE POLYPROPYLENE VENT SYSTEM MANU-
FACTURER’S INSTRUCTIONS.
12. After pipes have been cut and pre-- assembled, apply gener-
ous 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. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
13. While cement is still wet, twist pipe into socket with 1/4--in.
turn. Be sure pipe is fully inserted into fitting socket.
14. W ipe exc ess ce ment fr om joi nt. A continuous be ad of c eme nt
will be visible ar ound per imet er of a properly made joint.
15. Handle pi pe joi nt s ca refully unt i l ce m ent s ets.
16. Horizontal por t ions of the vent ing system shall be suppor ted to
prevent s agging. Space combustion a i r piping and vent piping
hangers as shown i n Tabl e 13. Support pi pes usi ng perforated
me tal hangi ng st rap or c om mercially a vailable hange rs or
straps des igned t o suppor t pla stic pipe.
17. Slope the vent and c ombustion air piping downwa rd towards
furnace. A minimum slope of at least 1/4-in. (6 mm) per linear
ft.(1- in (25 mm) per 4 ft.(1. 2 M)) with no s ags be t w een
hangers is required. See Caution Box below .
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in nuisance short
cycling, frozen vent termination, and/or no heat.
Slope the vent and combustion air piping downward towards
furnace a minimum of 1/4--in. (6 mm) per linear ft. of pipe.
CAUTION
!
18. Complete the vent and combustion air pipe installation by con-
necting the concentric vent or by installing the required termi-
nation e lbows as shown in Figs . 53, 54 and 55.
For Ventilated Combustion Air T ermination, See Fig. 56.
19. Use appr opr iate met hods to seal ope ni ngs where com bustion
air pi pe and vent pipe pas s through roof or sidewall.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
DO NOT use cement to join polypropylene venting systems.
Follow the polypropylene venting system manufacturer ’s
instructions for installing polypropylene venting systems.
!
WARNING
Table 13 – Hanger Spacing
Diameter
Material
PVC Sch 40 SDR 21 & 26 ABS CPVC Polypropylene
1 ½ --- i n . 3 --- f t . 2 ½ --- f t . 3 --- f t . 3 --- f t . 3.25--- ft.
3 8 --- m m 914--- mm 762---mm 914 --- mm 914--- mm 1000 mm
2 --- i n . 3 --- f t . 3 --- f t . 3 --- f t . 3 --- f t . 3.25--- ft.
5 1 --- m m 914--- mm 914---mm 914 --- mm 914--- mm 1000 mm
2 ½ --- i n . 3 1 / 2 --- f t . 3 --- f t . 3 1 / 2 --- f t . 3 1 / 2 --- f t . 3.25---ft.
6 4 --- m m 1067--- mm 914--- mm 1067---mm 1067--- mm 1000 mm
3 --- i n . 3 1 / 2 --- f t . 3 --- f t . 3 1 / 2 --- f t . 3 1 / 2 --- f t . 3.25--- ft.
7 6 --- m m 1067--- mm 914--- mm 1067---mm 1067--- mm 1000 mm
4 --- i n . 4 --- f t . 3 1 / 2 --- f t . 4 --- f t . 4 --- f t . 3.25--- ft.
102--- mm 1219--- mm 1067--- mm 1219---mm 1219--- mm 1000 mm
915SA