International comfort products C Series Installation Instructions Manual page 54

INSTALLATION INSTRUCTIONS
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
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 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 Figure 49 and Figure 51.
NOTE: For applications using vent pipe option indicated by
dashed lines in Figure 52 and Figure 53, 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.
54
(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 52, 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 52 to avoid recirculation of gases.
Inducer Outlet Restrictor
FOR VENT
To improve efficiency and operation of 40K, 60K, 100K, or
120K 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 14 -- Maximum Equivalent Vent Length. The
outlet restrictor for 40K models is shipped in the loose parts
bag. See Table 14 for usage, part numbers and sourcing of
40K, 60K, 100k and 120K inducer outlet restrictors.
To determine if the outlet restrictor is required, see Table 14
Failure to use an outlet restrictor on 40K 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
3. Snap the outlet restrictor in place.
4. Re-install the vent elbow
5. Torque vent elbow clamp 15 lb--in.
Specifications subject to change without notice.
on inside outlet of the inducer assembly.
Gas Furnace: N9MSB
440 01 4104 07