Modine Manufacturing IPT Installation And Service Manual page 13

INSTALLATION
Figure 13.1 - Vertical Venting through Sloped Roof
Listed Cap
H
Drip Leg
Downward slope 1/4" towards drip leg.
Table 13.1 - Minimum Height from Roof to Lowest
Discharge Opening
Rise X (inches) Roof Pitch
0-6 Flat to 6/12
6-7 6/12 to 7/12
7-8 7/12 to 8/12
8-9 8/12 to 9/12
9-10 9/12 to 10/12
10-11 10/12 to 11/12
11-12 11/12 to 12/12
12-14 12/12 to 14/12
14-16 14/12 to 16/12
16-18 16/12 to 18/12
18-20 18/12 to 20/12
20-21 20/12 to 21/12
* Size according to expected snow depth.
Additional Requirements for Horizontal Venting
1. All horizontal vents must be terminated with one of the
following approved vent caps: Gary 1092 or equivalent. In the
United States, the vent cap must be 24" from wall, while in
Canada, a distance of 48" from the wall is required.
2. When horizontal vents pass through a combustible wall (up to
8 inches thick), use a thimble with 2" clearances to the vent
and insulate between thimble and vent. The vent passage
may also be constructed and insulated as shown in Figure
13.2. Where horizontal vents pass through a non-combustible
wall, no clearances to the wall are required.
Figure 13.2 - Vent Construction through
Combustible Wall
Double Wall Vent Pipe
Double wall vent
section to maintain
clearance to
combustibles specified
by type B vent mfg.
Single Wall Vent Pipe
Listed thimble
to maintain
clearances as
specified by
listed thimble
manufacturer
Roof Pitch
x
is x/12
12"
See Figure 12.2
MIn. Height (ft)*
1
1.25
1.50
2
2.50
3.25
4
5
6
7
7.50
8
Gary Steel 1092
or equivalent
vent terminal
3. The vent system shall terminate at least 3' above any forced
air inlet (except direct vent units) located within 10', and at
least 4' below, 4' horizontally from, or 1' above any door,
window or gravity air inlet into any building. The bottom of the
vent terminal shall be located above the snow line or at least
1' above grade; whichever is greater. When located adjacent
to public walkways the vent system shall terminate not less
than 7' above grade.
4. Vent must extend beyond any combustible overhang of the
building.
5. The vent system shall not terminate over public walkways,
building entrances, or where condensate or vapor could
cause a nuisance or hazard or could be detrimental to the
operation of regulators, relief openings, or other equipment.
6. Precautions must be taken to prevent degradation of building
materials by flue products.
7. When vented horizontally, maintain a 1/4" per foot rise away
from the heater. Place a drain tee and clean out near the vent
connector (see Figure 13.3). Where local authorities have
jurisdiction, a 1/4" downward slope is acceptable. Use a drain
tee with a clean out near the exit of the vent (see Figure 13.4)
or allow the condensate to drip out the end.
Figure 13.3 - Horizontal Venting with Upward Pitch
Gary Steel 1092 or equivalent vent terminal
24" min.
(48" min.
in Canada)
Figure 13.4 = Horizontal Venting w/Downward Pitch
(with drip leg)
Gary Steel 1092 or equivalent vent terminal
24" min.
(48" min.
in Canada)
Additional Requirements for Common Venting
1. Only two identical units of the same Btu/hr rating and tube
length may be common vented into a 6" diameter or greater
vent pipe. The individual vents can connect to the common
vent as shown in Figure 14.1 or 14.2.
2. The common vent system can be either horizontal or vertical.
For through-wall penetrations, refer to horizontal or vertical
vent instructions.
3. Both units must be controlled by one thermostat. Refer to the
latest version of literature number 9-410, "Multiple Wiring of
Low Intensity Infrared Unit Heaters".
4. Limit the length of horizontal run to 3/4 the length of vertical
run when common venting vertically. Maintain certified vent
lengths to vent termination.
5. The vent length of each unit must be identical.
6. If the system does not utilize a 4" x 4" x 6" wye as shown in
Figure 14.2, the individual vents must enter the common vent
at different levels, as shown in Figure 14.1.
9-511
Clean out/drip leg
1/4" Slope up towards termination
Listed thimble
1/4" Slope down towards termination
Tee with drip leg and cleanout cap at low
point of vent system
Listed Thimble
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