915SB: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
45
Determine an appropriate location for termination kit using the
guidelines provided in section “Locating The Vent Termination” in
this instruction.
1. Cut two holes, one for each pipe, of appropriate size for pipe size
being used.
2. Loosely install elbow in bracket (if used) and place assembly on
combustion-air pipe.
3. Install bracket as shown in Fig. 40 and Fig. 49.
NOTE: For applications using vent pipe option indicated by dashed
lines in Fig. 40 and Fig. 41, rotate vent elbow 90_ from position.
4. Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping. DO NOT CEMENT
POLYPROPYLENE FITTINGS.
(Direct Vent / 2-Pipe System ONLY)
When two or more furnaces are vented near each other, two vent
terminations may be installed as shown in Fig. 40, but next vent
termination, or pair of vent terminations, must be at least 36 in. (914
mm) away from the first two terminations. It is important that vent
terminations be made as shown in Fig. 40 to avoid recirculation of vent
gases.
Inducer Outlet Restrictor
To improve efficiency and operation of 26K, 40K, 60K, 120K, or 140K
BTUH input models on very short vent systems, an inducer outlet
restrictor is required to be installed on the outlet of the inducer assembly.
The outlet restrictor is shown in the footnote of Table 12 -Maximum
Equivalent Vent Length. The outlet restrictor for 26K and 40K models is
shipped in the loose parts bag. See Table 12 for usage, part numbers and
sourcing of 60K, 120K, or 140K inducer outlet restrictors.
To determine if the outlet restrictor is required, see Table 12. Failure to
use an outlet restrictor on the 40K input models when required may
result in flame disturbance or flame sense lockout.
To install the outlet restrictor:
1. Remove the vent elbow from the inducer outlet.
2. Align the lock tabs on the outlet restrictor with the slots on inside
outlet of the inducer assembly.
3. Snap the outlet restrictor in place.
4. Re-install the vent elbow.
5. Torque vent elbow clamp 15-lb-in.
Table 16 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials
NOTICE
!
RECOMMENDED SUPPORT FOR VENT TERMINATIONS
It is recommended that sidewall vent terminations in excess of 24
inches (0.6 M) in vertical length be supported by EITHER the Direct
Vent Termination Kit shown in Table 11 or by field-supplied brackets
or supports fastened to the structure.
MATERIALS
USA
1. All pipe*, fittings*, primers**, and solvents** must conform to American National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards
2. See Table below for approved materials for use in the U.S.A.
3. UL 1738 vent systems must be composed of pipe*, fittings**, cements, and primers** from the same supplier.
CANADA
1. Installation in Canada must conform to the requirements of CAN/CSA B149 code.
2. Vent systems must be composed of pipe*, fittings*, cements, and primers from the same supplier and listed to ULC S636.
3. Not all materials below may be approved or listed to ULC S636.
4. Factory accessory concentric vent kits are ULC S636 listed.
Material Description Type
ASTM / ULC / UL Specification
Pipe* Fittings* Solvents/Primers** Cements
PVC
Pressure Pipe Schedule 40 D1785 / UL 1738
DWV Schedule 40 D1785 / D2665 D2466
Cellular Core Schedule 40 F891 or F656 D2564
SDR 26 N/A D2241 D2665
SDR 21 N/A D2241
IPEX Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
ABS
ABS Schedule 40 D1527 D2468 Clear Cleaner For
ABS†
D2235
DWV-IPS Sizes Schedule 40 D2661 D2661
Cellular Core
DWV-IPS Sizes
Schedule 40 F628
CPVC
Pressure Pipe Schedule 40 F441 F438 F656 F493
SDR N/A F442 N/A
IPEX Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
Royal Pipe Schedule 40 ULC S636 ULC S636 ULC S636 ULC S636
* PVC and ABS pipe may use either DWV or pressure rated fittings.
** Colored or tinted solvents or primers must be used where required by code in the USA
† ABS plastic does not require a primer before solvent cementing. A cleaner for ABS is recommended to remove any surface residue. ABS cleaners are
not subject to ASTM standards.
Polypropylene Approved Manufacturer Solvents Primers Cements
Poly Pro® M & G Dura Vent Not Permitted
Innoflue® Centrotherm Not Permitted
NOTE: Polypropylene vent systems are UL−1738 and ULC S636 listed and assembled using mechanical fastening systems supplied by the vent
manufacturer.
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