Modine HDS Manuel D'installation page 8

INSTALLATION - VENTING
Section B – Vertical 2-Pipe Vent System
Installation
B1. This section applies to vertically vented 2-pipe (one
combustion air inlet pipe and one vent pipe) vent systems
and is in addition to "Section A – General Instructions – All
Units".
B2. Vertical vent systems terminate vertically (up).
B3. It is recommended to install a tee with drip leg and clean out
cap as shown in Figure 8.1.
B4. The combustion air and vent pipes must be terminated with
2 listed vent caps.
B5. Vertical vents must terminate a minimum horizontal and
vertical distance from roof lines and adjacent walls or
obstructions. These minimum distances are outlined in
Figure 8.1 and Table 8.1.
B6. The vent must terminate at least 1' above and 6" horizontally
from the combustion air inlet.
Figure 8.1 - Vertical 2-Pipe Vent System - Sloped Roof
MINIMUM DISTANCE TO ADJOINING WALL
OR BUILDING IS 2 FEET.
REFER TO TABLE 8.1 FOR "H" DIMENSION.
ROOF FLASHING
"H" MIN*
(SEE TABLE 8.1)
USE LISTED THIMBLES
THROUGH CEILING
AND ROOF
X
ROOF PITCH IS:
X / 12
12
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
BACK VIEW
RECOMMENDED
8
LISTED
TERMINAL
"H" MIN*
(SEE TABLE 8.1)
TEE WITH DRIP LEG
AND CLEANOUT CAP
LISTED
TERMINAL
"H" MIN*
"H" MIN*
(SEE TABLE 8.1)
ROOF FLASHING
4" MIN
EXHAUST
TEE WITH DRIP LEG
AND CLEANOUT CAP
COMBUSTION AIR
(SLOPE 1/4" PER
FOOT DOWNWARD
12" MIN TOWARD DRIP LEG)
Table 8.1 - Minimum Height from Roof to Lowest
Discharge Opening
Rise X (in)
0-6
6-7
7-8
8-9
9-10
10-11
11-12
12-14
14-16
16-18
18-20
20-21
j Size according to expected snow depth.
Figure 8.2 - Vertical 2-Pipe Vent System - Flat Roof
TO WALL OR ADJOINING BUILDING
2' MIN
LISTED
TERMINAL
12" MIN
USE THIMBLE
THROUGH
12" MIN*
CELLING
B9. Once venting is complete, proceed section titled "Installation
– Gas Connections".
6-584.11
Roof Pitch Min Height H (ft) j
Flat to 6/12 1.00
6/12 to 7/12 1.25
7/12 to 8/12 1.50
8/12 to 9/12 2.00
9/12 to 10/12 2.50
10/12 to 11/12 3.25
11/12 to 12/12 4.00
12/12 to 14/12 5.00
14/12 to 16/12 6.00
16/12 to 18/12 7.00
18/12 to 20/12 7.50
20/12 to 21/12 8.00
6" MIN
LISTED
TERMINAL
ROOF FLASHING
* SIZE ACCORNING
TO EXPECTED
SNOW DEPTH.
TEE WITH DRIP LEG
AND CLEANOUT CAP