INSTALLATION INSTRUCTIONS Gas Furnace: WFAR
440 01 7104 02 45
Specifications subject to change without notice.
3. Slide assembled kit with rain shield REMOVED through
hole.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
4. Locate assembly through sidewall with rain shield
positioned no more than 1--in. (25 mm) from wall as
shown in Figure 53.
5. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
Two-Pipe and Single-Pipe Vent Termination
NOTE: Follow the instructions of the vent terminal
manufacturer. These instructions are provided as a reference,
only.
NOTICE
RECOMMENDED SUPPORT FOR VENT
TERMINATIONS
It is recommended that side--wall vent terminations in
excess of 24 inches (0.6 M) in vertical length be sup-
ported by EITHER the Direct Vent Termination Kit in
Table 12 or by field-supplied brackets or supports
fastened to the structure.
Determine an appropriate location for termination kit using the
guidelines provided in section “Locating The Vent Termination”
in this instruction.
1. Cut 2 holes, 1 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 Figure 53 and Figure 55.
NOTE: For applications using vent pipe option indicated by
dashed lines in Figure 53 and Figure 54, 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 / Two-Pipe System ONLY)
When two or more furnaces are vented near each other, two
vent terminations may be installed as shown in Figure 53, but
next vent termination, or pair of vent terminations, must be at
least 36--in. (914 mm) away from first two terminations. It is
important that vent terminations be made as shown in
Figure 53 to avoid recirculation of gases.
Inducer Outlet Restrictor
To improve efficiency and operation of 40,000 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 shipped in the loose parts bag.
To determine if the outlet restrictor is required, see Table 13.
Failure to use an outlet choke 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 12 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installations)
ASTM SPECIFICATION
(MARKED ON MATERIAL)
MATERI-
AL
PIPE FITTINGS
SOLVENT CEMENT
AND PRIMERS
DESCRIPTION
D1527 ABS Pipe — — Schedule--40
D1785 PVC Pipe — — Schedule--40
D2235 For ABS — — Solvent Cement For ABS
D2241 PVC Pipe — — SDR--21 & SDR--26
D2466 PVC — Fittings — Schedule--40
D2468 ABS — Fittings — Schedule--40
D2564 For PVC — — Solvent Cement For PVC
D2661 ABS Pipe Fittings — DWV at Schedule--40 IPS sizes
D2665 PVC Pipe Fittings — DWV
F438 CPVC — Fittings — Schedule--40
F441 CPVC Pipe — — Schedule--40
F442 CPVC Pipe — — SDR
F493 For CPVC — — Solvent Cement For CPVC
F628 ABS Pipe — —
Cellular Core DWV at
Schedule--40 IPS sizes
F656 For PVC — — Primer For PVC
F891 PVC Pipe — —
Cellular Core Schedule--40 &
DWV
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