IPT Installation Manual

12
9-511.4
INSTALLATION
Table 12.1 - Maximum Vent Length
Downward slope 1/4" towards drip leg.
Drip Leg
2' Min.
1' Min.*
Approved cap
See Figure 12.2
* Size according to expected snow depth.
8. Avoid venting through unheated space when possible. When
single wall pipe does pass through an unheated space, insulate
runs greater than 5' to minimize condensation. Inspect for
leakage prior to insulating and use insulation that is
noncombustible with a rating of not less than 550°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 12.2. The drip leg
should be cleaned annually.
9. Where the vent passes through a combustible wall or floor or
ceiling, a listed metal thimble 4" greater than the vent
diameter is necessary. If there are six feet or more of vertical
vent pipe in the open space between the unit heater and
where the vent pipe passes through the floor or roof, 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 a 6 inch clearance. Any material used to
close an opening must be noncombustible. Vent pipes must
be adequately supported and sealed with a 550°F or greater
sealant.
10. The vent termial must be Modine part number:
- 5H0722850005 (item code 27865) 3" vent pipe
- 5H0722850001 (item code 27866) 4" vent pipe
11. Do NOT vent this appliance into a masonry chimney.
12. Do NOT use dampers or other devices in the vent pipes.
13. Do NOT use PVC pipe.
14. Precautions must be taken to prevent degradation of
building materials by flue products.
15. The top of the vertical stack should extend at least 2' above
any portion of a building within a horizontal distance of 2'.
16. For pitched roof vertical venting, refer to Figure 13.1 and
Table 13.1 for the vertical distance that the cap must extend
above the pitched roof.
17. Common venting is not allowed for Category III appliances.
Venting
WARNING
1. A built-in combustion air blower is provided – additional
external draft hoods (diverters) or power exhausters are
not required or permitted.
CAUTION
Installation must conform with local building codes or in the
absence of local codes, with Part 7, Venting of Equipment, or
the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest
edition. In Canada installation must be in accordance with
CAN/CGA-B149.1 for natural gas units, and CAN/
CGA-B149.2 for propane units.
General Venting Instructions
The vent pipe may be installed in either a vertical or horizontal
method. Certified vent pipe lengths are as follows:
1. All systems are considered a Category III appliance and the
vent system must be approved for Category III application in
accordance with UL1738 or ULCS636.
2. Use either a certified Category III vent system with a
maximum flue temperature of up to 550°F, or single wall vent
pipe with all joints (fastened with 3 corrosion resistant sheet
metal screws) and seams sealed with a 550°F or greater
sealant. Follow the vent manufacturers instructions for
clearance to combustibles.
3. Refer to the National Fuel Gas Code for the minimum
material thickness and composition of the vent material.
4. If single wall vent systems are used, Type B vent can be used
to terminate the vent system. The Type B double wall vent
must be one continuous section. Under no circumstances
should two sections of double wall vent pipe be joined
together within one vent system due to the inability to verify
complete seal at inner pipes.
5. All seams and joints must be inspected to ensure gas
tightness after installation. Vent system (connections, joints,
and seems) must be leak checked using a soap solution
6. Models 50-75 use 3" venting. Models 100-200 use 4". For
models 50-75, a 4" to 3" reducer must be used to connect the
last tube section to the 3" vent pipe. It is recommended that
vent pipes be fitted with a tee with a drip leg and a clean out
cap to prevent any moisture in the vent pipe from entering the
unit. The drip leg should be inspected and cleaned out
periodically during the heating season See figure 13.1 & 13.3.
7. The National Fuel Gas Code requires a minimum clearance
of 6 inches from combustible materials for single wall vent
pipe. The minimum distance from combustible materials is
based on the combustible material surface not exceeding
160°F. Clearance from the vent pipe (or the top of the unit)
may be required to be greater than 6 inches if heat damage
other than fire (such as material distortion or discoloration)
could result.
Figure 12.2 - Vertical Venting
Figure 12.3 - Construction through Combustible Roof
Input MBH
Min Vent
Lenght (ft.)
Maximum Vent Length (ft.)
1-Stage 2-Stage
50, 60, 75, 100
5'
20' 20'
125 30' 30'
150, 175, 200 40' 30'