Modine Manufacturing PTP Installation And Service Manual page 7

InsTAllATIon - venTIng
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. All seams and joints of the single wall pipe must be sealed
with metallic 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 A11 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 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.
A12. Vent termination clearances must be maintained:
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
6-560.4
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. The vent terminal must be:
Table 7.2 - vent Terminals
model size modine Pn
150-200 5H0722850001
250-400 5H0722850002
A20. In addition to following these eneral Instructions, specific
instructions for Vertical Category I or Horizontal Category
III vent systems must also be followed. The following
outlines the differences:
Table 7.3 - AnsI unit Heater venting requirements
Category description
Negative vent pressure
I
Non-condensing
Negative vent pressure
II
Condensing
Positive vent pressure
III
Non-condensing
Positive vent pressure
Condensing
IV
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
• V ertical vent systems terminate vertically (up) (an example
is shown in Figure 8.1).
• T he 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').
• T he vent terminates a minimum of 5' above the vent
connector on the unit.
• I f the vent system to be installed meets ALL these criteria
(an example is shown in Figure 8.1), 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
• H orizontal vent systems terminate horizontally (sideways)
(an example is shown in Figure 9.2).
• A vent system that terminates vertically but has a
horizontal run that exceeds 75% of the vertical rise is
considered horizontal.
• H orizontal vent configurations are Category III. Additional
requirements are covered in "Section C - Horizontal
Category III Vent System Installation".
other listed Terminals
Gary Steel 1092
Gary Steel 1092
venting requirements
Follow standard venting
requirements.
Condensate must be
drained.
Vent must be gas tight.
Vent must be liquid and
gas tight. Condensate
must be drained.
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