Installation and Service Manual

6-584.13
A10. 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.
A11. 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 a listed
vent cap. Refer to instruction A12 in “Section A – General
Instructions – All Units” for attaching double wall pipe to
single wall pipe.
A12. 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 overtighten.
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.
A13. Vent termination clearances must be maintained:
A14. Do NOT vent this appliance into a masonry chimney.
A15. Do NOT use dampers or other devices in the vent or
combustion air pipes.
A16.
The venting system must be exclusive to a single
appliance, and no other appliance is allowed to be vented
into it.
A17. Precautions must be taken to prevent degradation of
building materials by flue products.
A18. Single wall vent pipe must not pass through any
unoccupied attic, inside wall, concealed space, or floor.
A19. 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:
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 9.1).
• 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 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”.
7
INSTALLATION - VENTING
Minimum Clearances for
Structure Vent Terminal Location
Forced air inlet within 10 feet 3 feet above
Combustion air inlet of another
appliance 6 feet all directions
Door, window, gravity air inlet, 4 feet horizontal and below
or any building opening 1 foot above
Electric meter, gas meter, gas 4 feet horizontal (U.S.)
regulator, and relief equipment j  6 feet horizontal (Canada)
Gas regulator j 3 feet horizontal (U.S.)
6 feet horizontal (Canada)
Adjoining building or parapet wall 6 feet all directions
Adjacent public walkways 7 feet all directions
Grade (ground level) 3 feet above
Table 7.1 - Vent Termination Clearances
j Do not terminate the vent directly above a gas meter or regulator.
Table 7.2 - Vent Terminals (two pipe)
Model Size Modine PN
30-45 5H0722850005
60-75 5H0722850001
100-125 5H0722850001