Modine HD Serie Manuel D'utilisation page 7

INSTALLATION - VENTING
diameter 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
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.
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 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 two pieces of pipe. Do not over tighten.
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.
A12. Vent termination clearances must be maintained, refer to
Table 7.1.
A13. Do NOT use dampers or other devices in the vent or
combustion air pipes.
A14. Precautions must be taken to prevent degradation of
building materials by flue products.
A15. Single wall vent pipe must not pass through any
unoccupied attic, inside wall, concealed space, or floor.
A16. 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.
Table 7.1 - Vent Termination Clearances
Vent Shall Terminate:
3 feet above
6 feet in all directions
3 feet in all directions
4 feet below, 4 feet horizontal, or 1 foot above
3 feet in all directions

3 feet horizontal
2 feet in all directions
7 feet in all directions
1 foot above
1 foot below or 1 foot beyond
3 feet below or 1 foot beyond
 Do not terminate the vent directly above a gas meter or regulator. Recommendations based on CSA B149.1 and NFPA 54. Venting must conform with applicable current revision of local and
national installation codes.
A17. The vent terminal must be:
Table 7.2 - Vent Terminals
Model Size
30-75
100-125
thimble
Structure
Forced air inlet within 10' (US)
Forced air inlet (Canada)
Combustion Air inlet of another appliance
Door window, gravity air inlet, or any building opening (US)
Door window, gravity air inlet, or any building opening (Canada)
Electric meter, gas meter, gas regulator, and relief equipment
Adjacent building, adjoining building, or parapet wall
Adjacent public walkways
Grade (ground level)
Eave with 24" overhang or less
Eave with greater than 24" overhang
Modine PN
5H0722850005
5H0722850001
6-583.19
A18. In addition to following these general instructions, specific
instructions for Vertical Category I or Horizontal Category III
vent systems must also be followed. Table 7.3 outlines the
differences:
Table 7.3 - ANSI Unit Heater Venting Requirements
Category Description
I Negative vent pressure
Non-condensing
II Negative vent pressure
Condensing
III Positive vent pressure
Non-condensing
IV Positive vent pressure
Condensing
Note: Vent connectors serving Category I appliances shall not be connected into
any portion of mechanical draft systems operating under positive pressure
Vertical Category I Vent System Determination
• Vertical vent systems terminate vertically (up).
• The horizontal portion of the vent run cannot exceed 75%
of the vertical rise (Example: If the vent height is 10', the
horizontal portion of the vent system cannot exceed 7.5').
• The vent terminates a minimum of 5' above the vent
connector on the unit.
• If the vent system to be installed meets ALL these criteria
(an example is shown in Figure 9.1), proceed to "Section B –
Vertical Vent System Installation". For all other cases, proceed
to the next section for Horizontal Category III Vent System
Determination:
Horizontal Category III Vent System Determination
• Horizontal vent systems terminate horizontally (sideways)
• A vent system that terminates vertically but has a horizontal
run that exceeds 75% of the vertical rise is considered
horizontal.
• Horizontal vent configurations are Category III. For residential
installations, this requires the use of an agency approved
(UL1738) Category III vent system. Additional requirements,
including those for commercial and industrial installations are
covered in "Section C – Horizontal, Category III Vent System
Installation".
Venting Requirements
Follow standard
venting requirements.
Condensate must
be drained.
Vent must be gas tight.
Vent must be liquid and
gastight. Condensate
must be drained.
Reference Standard
NFPA 54
CSA B149.1
CSA B149.1
NFPA 54
CSA B149.1
CSA B149.1
Modine
NFPA 54/CSA B149.1
NFPA 54/CSA B149.1
Modine
Modine
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