International comfort products F9MVE Installation Instructions Manual page 49

INSTALLATION INSTRUCTIONS
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 Terminations
Single and two pipe vent must be installed as shown in
Figure 47 and Figure 48. Maintain the required separation
distance between vents or pairs of vents as shown in
Figure 47 and Figure 48 and all clearance shown in Figure 59
or Figure 60.
NOTICE
RECOMMENDED SUPPORT
TERMINATIONS
It is recommended that rooftop vent terminations in
excess of 36 inches (1.0 M) in vertical length be
supported by EITHER the Direct Vent Termination Kit
shown in Table 12 or by field-supplied brackets or
supports fastened to the structure.
Cut the required number of holes in the roof or sidewall for vent
and (when used) combustion air pipes. Sidewall holes for
two-pipe vent terminations should be side-by-side, allowing
space between the pipes for the elbows to fit on the pipes.
Holes in the roof for direct−vent (two−pipe) terminations should
be spaced no more than 18−in. (457 mm) apart to help avoid
vent gas recirculation into combustion air intake.
Termination elbows will be installed after the vent and (if used)
combustion air pipe is installed.
Sidewall Terminations
Concentric Vent
NOTE: Follow the instructions of the vent terminal
manufacturer. These instructions are provided as a reference,
only.
Determine an appropriate location for termination kit using the
guidelines provided in section "Locating The Vent Termination"
in this instruction.
1. Cut one 4−in. diameter hole for 2−in. kit, or one 5−in.
diameter hole for 3−in. kit.
2. Loosely assemble concentric
termination components together using instructions in kit.
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 47.
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.
440 01 4400 03
RECOMMENDED
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"
FOR VENT
in this instruction.
NOTE: For applications using vent pipe option indicated by
dashed lines in Figure 47 and Figure 48, rotate vent elbow 90_
from position.
(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 44 and
Figure 46, 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 44 and Figure 46 to avoid recirculation of
gases.
Inducer Outlet Restrictor
(PSC models only)
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 14 or
vent/combustion air Table 16.
NOTE:
result in flame disturbance or flame sense lockout.
To install the outlet restrictor:
Specifications subject to change without notice.
Gas Furnace: (F/G)9MVE
NOTICE
SUPPORT
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 44 and Figure 46.
4. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
Failure to use an outlet choke when required may
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.
FOR VENT
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