NTI Trinity Tft399 Installation And Operation Manual page 24

│Installation and Operation Instructions
Trinity
For installations that exit the wall below grade:
1. Excavate site to a point below where the pipes
are to exit as shown.
2. Ensure the wall is fully sealed where the pipes
penetrate.
3. The Vent/Air-inlet piping MUST be secured to
the side of the building above grade, as shown,
to provide rigidity.
4. Optional mounting bracket p/n 82075 for
securing the exhaust pipes (only applicable for
3" PVC/CPVC venting).
5. Ensure that the Vent/Air-inlet clearances are
maintained, see Section 5.0 for details.
Vent piping outside the building is permitted under
the following conditions:
1. The maximum length outside the building is 20
feet [6.1 m]. Note that outdoor length must be
included in the overall vent length calculation.
2. All normal termination clearances are maintained.
3. The pipe is supported every 24" [610 mm].
4. The exhaust and air-inlet are sloped back to the
boiler 1/2" elevation for every linear foot [13 mm
for every linear 305 mm].
It is permissible to use an existing chimney as a chase
way to run the Vent/Air-inlet piping as long as:
1. The chimney is not being used by any other
boiler.
2. Flue gases don't enter the vacant chimney.
3. Only Trinity certified venting materials are used,
see Section 4.0.
4. Vent lengths are within the maximums specified.
5. The top of the chimney is capped and the
Vent/Air-inlet pipes are flashed to prevent
leakage into the vacant chimney.
Under no circumstances may an existing chimney or chase-way be used to vent or
provide combustion air to a Trinity Tft. Failure to follow these instructions will result in
fire, property damage, serious injury or death.
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Figure 4-8 Venting Below Grade
12" [305 mm]
allowance above
Figure 4-9 Outdoor Venting
Figure 4-10 Existing Chimney Chase Way
Supports every
24" [610 mm]
plus snow
grade
Gas Vent Directly Below
Keep Free of Obstructions
Exhaust
Vent
Exhaust Vent
Chimney
Cap
Air-Inlet
Existing
Chimney
(used as a
chase way)
Tft Series
Air-Inlet
Maximum of 20 ft
[6.1 m] is permitted
for piping outside a
building.
Exhaust Vent Min.
18" [457 mm]
above air-inlet
Air-Inlet
Min. 12" [305 mm]
above roof and
snow level