Modine Manufacturing IFS Installation And Service Manual page 8

INSTALLATION - VENTING
Figure 8.1 - Horizontal 2-Pipe Venting
MUST USE THIMBLE
THROUGH WALL
24'' MIN.
TERMINAL
12''
ADJACENT
BUILDING
TERMINAL
16'' MIN.
24'' MIN.
COMBUSTION AIR
SUPPORT BRACKET
(See Fig. 9.2 for detail)
C7. When horizontal vents pass through a combustible wall (up
to 8 inches thick), the vent passage must be constructed
and insulated as shown in Figure 8.2.
C8. The vent must be supported as shown in Figure 8.2.
C9. When condensation may be a problem, the vent system
shall not terminate over public walkways or over an area
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of
regulators, relief openings, or other equipment.
Figure 8.2 - Exhaust Vent Construction Through
Combustible Walls and Support Bracket
METAL
SLEEVE
2" MIN.
VENT PIPE
DIAMETER
METAL FACE
METAL
SLEEVE
2" MIN.
1"
C10. Maintain a 1/4" per foot downward slope away from the
heater and place a drip leg with clean out near the exit of
the vent as shown in Figure 8.1, or allow the condensate
to drip out the end.
C11. For a vent termination located under an eave, the
distance of the overhang must not exceed 24". The
clearance to combustibles above the exterior vent must
be maintained at a minimum of 12". Consult the National
Fuel Gas Code for additional requirements for eaves that
have ventilation openings.
C12. Once venting is complete, proceed section titled
"Installation - Gas Connections".
Section D - Concentric Vent System
Installation
D1. This section applies to both horizontally and vertically
vented concentric vent systems as defined in "Section A –
General Instructions – All Units", and is in addition to the
instructions in that section.
D2. When utilizing the concentric vent option, it should have
been predetermined whether the appliance will be
horizontally or vertically vented. Before proceeding, verify
that the concentric vent kit received contains the correct
components for the installation:
8
SUPPORT BRACKET
PITCH COMBUSTION AIR
(See Fig. 9.2 for detail)
PIPE DOWNWARD FROM
APPLIANCE 1/4" PER FOOT
EXHAUST
TEE WITH DRIP
LEG AND
CLEANOUT CAP
PITCH VENT PIPE DOWNWARD
AT LOW POINT
FROM APPLIANCE 1/4" PER FOOT
OF VENT SYSTEM
FIBER GLASS
INSULATION
MIN. 2"
PLATE
1"
9"
VENT TERMINATION
45 SUPPORT BRACKET
9" (where required)
(Make from 1" x 1" steel angle)
For Vertically Vented Units (Refer to Figure 8.3):
j Concentric adapter assembly (same for horizontal and
vertical kits)
k Standard Gary Steel 1092 vent termination
l Specially designed inlet terminal (part #5H75154)
Figure 8.3 - Vertical Concentric Vent Kit Components
Combustion Air
Inlet Terminal
Concentric
Vent Adapter
Box
Combustion Air
For Horizontally Vented Units (Refer to Figure 8.4):
j Concentric adapter assembly (same for horizontal and
vertical kits)
k Special vent termination cap (part #5H75150)
l Special inlet air guard
Figure 8.4 - Horizontal Concentric Vent Kit
Components
Concentric
Vent Adapter
Box
Combustion Air
Intake Guard
The concentric vent adapter box must be installed inside of
the structure or building. Do not install this box on the exterior
of a building or structure.
D3. Once the kit contents have been verified as correct for the
direction of venting, the concentric vent adapter box is to be
installed. Determine the location of the box. Be sure to
maintain all clearances as listed in these instructions.
D4. The adapter box is to be mounted on the interior side of the
building. It must not be mounted outside the building. The
adapter box has integral mounting holes for ease of
installation. When horizontal venting multiple units, the
minimum spacing between any sides of the adapter boxes
must be 18" and boxes must not overlap in the vertical
plane (above or below). When condensation may be a
problem, the vent system shall not terminate over public
walkways or over an area where condensate or vapor could
create a nuisance or hazard or could be detrimental to the
operation of regulators, relief openings, or other equipment.
AIR 5-593.9
Outlet Vent
Termination Cap
6" Min.
12" Min.*
Building
Roof / Ceiling
Exhaust
14" Min.
1" Min.
CAUTION
* Size according
to expected
snow depth.
Outlet Vent
Termination Cap
Building Side Wall