Modine PTS Manuel D'installation page 7

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INSTALLATION - VENTING
less than 400°F. Install a tee fitting at the low point of the
vent system and provide a drip leg with a clean out cap as
shown in Figure 8.1.
A9. When the vent passes through a combustible INTERIOR
wall or floor, a metal thimble 4" greater than the vent
diameter is necessary. If there is 6' or more of vent pipe in
the open space between the appliance and where the vent
pipe passes through the wall or floor, the thimble need only
be 2" greater than the diameter of the vent pipe. If a
thimble is not used, all combustible material must be cut
away to provide 6" of clearance. Where authorities have
jurisdiction, Type B vent may be used for the last section of
vent pipe to maintain clearance to combustibles while
passing through wall or floor (see Figure 6.1). Any material
used to close the opening must be noncombustible.
A10. Seal all seams and joints of un-gasketed single wall pipe
with metal tape or Silastic suitable for temperatures up to
400°F. Wrap the tape 2 full turns around the vent pipe. One
continuous section of double wall vent pipe may be used
within the vent system to pass through the wall to the listed
vent cap. Refer to instruction A12 in "Section A – General
Instructions – All Units" for attaching double wall pipe to
single wall pipe.
A11. The following are General Instructions for Double Wall
(Type B) Terminal Pipe Installation:
How to attach a single wall vent terminal to double wall
(Type B) vent pipe:
1. Look for the "flow" arrow on the vent pipe.
2. Slide the vent terminal inside the exhaust end of the
double wall vent pipe.
3. Drill 3 holes through the pipe and the vent terminal.
Using 3/4" long sheet metal screws, attach the cap to
the pipe. Do not over tighten.
How to connect a single wall vent system to a double wall
(Type B) vent pipe:
1. Slide the single wall pipe inside the inner wall of the
double wall pipe.
2. Drill 3 holes through both walls of the single and double
wall vent pipes. Using 3/4" sheet metal screws, attach
the 2 pieces of pipe. Do not overtighten.
3. The gap between the single and double wall pipe must
be sealed but it is not necessary to fill the full volume of
the annular area. To seal, run a large bead of 400°F
silastic around the gap.
Table 7.1 - Vent Termination Clearances
Structure
Forced air inlet within 10 feet
Combustion air inlet of another
appliance
Door, window, gravity air inlet,
or any building opening
Electric meter, gas meter, gas
regulator, and relief equipment 
Gas regulator

Adjoining building or parapet wall
Adjacent public walkways
Grade (ground level)
 Do not terminate the vent directly above a gas meter or regulator.
Minimum Clearances for
Vent Terminal Location
3 feet above
6 feet all directions
4 feet horizontal and below
1 foot above
4 feet horizontal (U.S.)
6 feet horizontal (Canada)
3 feet horizontal (U.S.)
6 feet horizontal (Canada)
6 feet all directions
7 feet all directions
3 feet above
6-561.12
A12. Vent termination clearances must be maintained:
A13. Do NOT vent this appliance into a masonry chimney.
A14. Do NOT use dampers or other devices in the vent or
combustion air pipes.
A15. The venting system must be exclusive to a single
appliance and no other appliance is allowed to be vented
into it.
A16. Precautions must be taken to prevent degradation of
building materials by flue products.
A17. Single wall vent pipe must not pass through any
unoccupied attic, inside wall, concealed space, or floor.
A18. Uninsulated single wall vent pipe must not be used
outdoors for venting appliances in regions where the 99%
winter design temperature is below 32°F.
A19. Long runs of horizontal or vertical combustion air pipes
may require insulation in very cold climates to prevent the
buildup of condensation on the outside of the pipe where
the pipe passes through conditioned spaces.
A20. Vertical combustion air pipes should be fitted with a tee
with a drip leg and a clean out cap to prevent against the
possibility of any moisture in the combustion air pipe from
entering the unit. The drip leg should be inspected and
cleaned out periodically during the heating season.
A21. The vent terminal must be:
Table 7.2 - Vent Terminals
Model Size
150-200
250-400
A22. In addition to following these general instructions, specific
instructions for vertical and horizontal vent systems in
2-Pipe or concentric vent configurations must also be
followed. The following outlines the differences:
Vertical Category III Vent System Determination
• Vertical vent systems terminate vertically (up)
(an example is shown in Figure 8.1).
• Determine the venting configuration as follows:
> For two building penetrations through the wall or roof
(one for the combustion air inlet pipe and one for the
vent pipe), proceed to "Section B - Vertical 2-Pipe
Venting".
> For a single larger building penetration through the
wall or roof, through which both the combustion air
inlet and vent pipes will pass, proceed to "Section D -
Horizontal and Vertical Concentric Venting".
> For all other cases, proceed to the next section for
Horizontal Vent System Determination.
Horizontal Category III Vent System Determination
• Horizontal vent systems terminate horizontally
(sideways) (an example is shown in Figure 8.2).
• Determine the venting configuration as follows:
> For 2 building penetrations through the wall or roof
(1 for the combustion air inlet pipe and 1 for the vent
pipe), proceed to "Section C - Horizontal 2-Pipe
Venting".
> For a single larger building penetration through the
wall or roof, through which both the combustion air
inlet and vent pipes will pass, proceed to "Section D -
Horizontal and Vertical Concentric Venting".
Modine PN
5H0722850001
5H0722850002
7

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