Nortek SD Ultra Low Nox Series, Installation Instructions Manual

Page: 10 / 48

10
1. Slide the rubber coupling over the end of the pipe that is
attached to the furnace and secure it with one of the hose
clamps.
2. Slide the other end of the rubber coupling onto the other
pipe from the vent.
3. Secure the coupling with the second hose clamp, ensuring
that the connection is tight and leak free.
Outdoor Terminations - Horizontal Venting
• Vent and combustion air intake terminations shall be
installed as shown in Figure 7 & Figure 8 and in accordance
with these instructions:
• Vent termination clearances must be consistent with the
NFGC, ANSI 2223.1/NFPA 54.
Table 10 (page 35)
lists
the necessary distances from the vent termination to
windows and building air intakes.
• Vent and combustion air intake terminations must
be located to ensure proper furnace operation and
conformance to applicable codes. A vent terminal must
be located at least 3 feet above any forced air inlet located
within 10 feet. This does not apply to the combustion air
inlet of a direct vent (two pipe) appliance. See
Table 14
(page 39) .
• All minimum clearances must be maintained to protect
building materials from degradation by flue gases. See
(
Figure 8
).
• For optimal performance, vent the furnace through a wall
that experiences the least exposure to winter winds.
• The vent termination shall be located at least 3 ft.
horizontally from any electric meter, gas meter, regulator
and any relief equipment. These distances apply ONLY
to U.S. installations.
• Do not install the vent terminal such that exhaust is
directed into window wells, stairwells, under decks or into
alcoves or similar recessed areas, and do not terminate
above any public walkways.
• If venting horizontally, a side wall vent kit is available
according to the pipe diameter size of the installation. For
2 inch pipe use side wall vent kit #904617, and for 3 inch
pipe use kit #904347. Please follow the instructions
provided with the kit.
• Concentric vent termination kits are available for use with
these furnaces. Refer to the technical sales literature for
kit numbers.
2 Inch pipe: U.S. use kit #904177
3 inch pipe: U.S. use kit # 904176
• When the vent pipe must exit an exterior wall close to
the grade or expected snow level where it is not possible
to obtain clearances shown in Figure 7 , a riser may be
provided as shown in Figure 9 . Insulation is required to
prevent freezing of this section of pipe. See
Table 2 (page
11)
for vent freezing protection.
Outdoor Terminations - Vertical Venting
Termination spacing requirements from the roof and from
Figure 7. Inlet & Exhaust Pipe Clearances
12” min.
to maximum
expected sn
ow lev
el
(both pipes
)
90° Elbo
w
Exhaust v
ent
option
B
Exhaust v
ent
option
A
Mounting kit
faceplate
secured to
wall with scre
ws
(both pipes
)
Combustion
air inlet
Exhaust v
ent
option
C
18” Min. 18” Min
.
36” Max. 36” Max
.
8” Min
.
36” Max.
(all positions)
Note
2
Mechanical draft
vent terminal
Direct v
ent
terminal
50,000 Btuh
or less
Forced air inlet
Direct vent
terminal - more
than 50,000 Btuh
Mechanical
draft
vent
ter
minal
Mechanical
draft v
ent
terminal
Less
than
10 ft.
3 ft.
NOTES:
1. All dimensions shown are
minimum requirements.
2. Exterior vent terminations must
be located at least 12” above the
maximum expected snow level.
Note
2
4 ft
4 ft
12 in.
12 in.
9 in
.
Note
2
Figure 8. Vent Locations
Figure 9. Alternate Horizontal Vent Installation
Support
NOTE: Vent Configuration to Provide
12" Minimum height above Snow Level.
1/2"
Armaflex
Insulation or
Equivalent
(if required)
12" Above
Maximum
Expected
Snow Level
19" Max.
(See Note)
Outside
Wall