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TRX Series II - Installation - Startup - Maintenance Instructions
G. Exhaust Vent and Intake Pipe Installation
1. Use only solid PVC, CPVC, or stainless steel pipe or a
Polypropylene vent system approved for use with Category IV
appliances.
ABS pipe material may be used on air inlet piping only.
2. Remove all burrs and debris from joints and fittings.
3. When using PVC or CPVC pipe, all joints must be properly cleaned,
primed, and cemented. Use only cement and primer approved for
use with the pipe material. Cement must conform to ASTM D2564
for PVC and ASTM F493 for CPVC pipe. NOTE: DO NOT CEMENT
POLYPROPYLENE PIPE.
4. Ensure the vent is located where it will not be exposed to
prevailing winds.
5. In all roof venting applications, exhaust discharge must point
away from the pitch of the roof.
6. If the exhaust vent is to be terminated in a walled off area (such as
a roof with a parapet wall), ensure the exhaust vent terminates a
minimum of 10’ from nearest wall and extends level with or above
the top of the wall. This will ensure flue gas does does not get
trapped and possibly recirculated into the intake air pipe, which
could contaminate the combustion air.
7. To prevent water leakage, install adequate roof flashing where the
pipe enters the roof.
8. If it can be avoided do not locate vent directly over public
walkways, driveways, or parking lots in climates where freezing
conditions are possible. Condensate could drip and freeze,
resulting in a slip hazard or damage to vehicles or machinery.
9. Due to potential moisture build-up, sidewall venting may not
be the preferred venting option. To save time and cost, carefully
consider venting installation and location.
10. Horizontal lengths of exhaust vent must slope back towards the
boiler not less than ¼” per foot to allow condensate to drain from
the vent pipe.
11. Do not terminate vent where vapors can accumulate and harm
people or pets.
12. When it can be avoided, do not terminate vent where vapors
can damage shrubs or plants. Such damages are not covered by
product warranty.
13. Moisture in the exhaust gas will condense as it leaves the vent
terminal. In cold weather this condensate can freeze on the
exterior wall, under the eaves, and on surrounding objects,
including shrubs. Some discoloration to the exterior of the
building is to be expected. However, improper location or
installation can result in severe damage to the structure or
exterior fifinish of the building, and increase the opportunity for
vent blockages and nuisance shutdowns.
14. In vacant chimney applications, install and seal a rain cap over
existing chimney openings.
15. All piping must be fully supported. Use pipe hangers at a
minimum of 4 foot intervals to prevent sagging of the pipe where
condensate may form.
16. Do not use the boiler to support any piping.
17. Ensure the outdoor exhaust vent and intake pipe terminations
are screened to prevent blockage caused by debris or birds. Vent
screens are included with this boiler.
18. Maximum Snow Level Determination: These installation
instructions reference snow levels in establishing a minimum
All joints of positive pressure vent systems must be sealed completely to
prevent leakage of flue products into the living space. Failure to do so
could result in property damage, serious injury, or death.
WARNING
Part 5 - Venting
height for the installation of exhaust vent or air intake
terminations. Snow levels shall be determined as follows:
a. The installation location may, by ordinance, designate how
snow levels are calculated in that location; or
b. In the absence of specific ordinances, snow levels shall be
calculated from the average monthly maximum depth of snow
accumulation as indicated by the National Weather Service’s 10
year statistics for the installation location/geographical area.
In addition:
• Total length of vent piping shall not exceed the limits specified in
this manual.
• The vent piping for this direct vented appliance is approved for
zero clearance to combustible construction.
• The flue products coming from the exhaust vent will create a large
plume when the heater is in operation. Avoid venting in areas that
will affect neighboring buildings or be considered objectionable.
• DO NOT locate exhaust vent or intake pipe in a parking area where
machinery may damage the pipe.
• DO NOT vent near soffit vents, crawl space vents, or other areas
where condensate or vapor could create a nuisance or hazard or
cause property damage.
• DO NOT vent where condensate vapor could cause damage or
could be detrimental to the operation of regulators, relief valve, or
other equipment.
In the Commonwealth of Massachusetts and as Required by State
and Local Codes:
• The vented gas fueled appliance shall not be installed so its
combustion, ventilation, or dilution air is obtained from a bedroom
or bathroom.
• Signage: Whenever any through-the-wall (horizontal or sidewall)
vent is installed less than seven feet above the finished grade, a
metal or plastic identification plate shall be permanently mounted
to the exterior of the building at a minimum height of eight feet
above grade directly in line with the exhaust vent terminal. The
sign shall read, in print no less than 0.5 inches in size, “GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.
• Marking of Exhaust Vent and Intake Pipe: Piping used for
ventilation, make-up, or combustion air intake shall be labeled as
follows:
a. Throughout the entire developed length:
i. Labels must be placed every ten feet for exposed/visible
piping; or
ii. Labels must be placed every three feet for concealed piping.
b. At all changes of direction;
c. On each side of a penetration through a partition, wall or ceiling;
and
d. The labels shall be black lettering that:
i. Indicates that the piping is used for ventilation, make-up, or
combustion air intake, and
ii. The letters shall be sized equal to a minimum of the pipe
diameter. However, for piping with a diameter exceeding two
inches, said lettering does not need to be larger than two
inches.
The following table lists optional exhaust/intake terminations
available from NTI:
Description Stock Code
3” PVC Concentric Termination Kit 84634
3” PVC Low Profile Termination Kit 84357
2” PVC Low Profile Termination Kit 85062
Table 16 - Optional Vent Kits
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