Exhaust Vent And Intake Pipe Sizing; Tightening Boiler Collar To Exhaust Vent And Intake Pipe - NTI TRX085 Installation, Start-Up, Maintenance, Parts, Warranty

E. Exhaust Vent and Intake Pipe Sizing
1. The factory ready exhaust vent and intake air pipe diameter is 2".
The vent diameter can be increased to 3" by installing a reducing
coupling in a vertical length of pipe.
2. The total length of the intake air pipe run must not exceed one
hundred (100) feet in 2" pipe, or one hundred fifty (150) feet in
3" pipe.
NOTE: There is no minimum length for the intake air pipe run.
3. The total length of the exhaust vent pipe run must not be less
than six (6) feet.
4. The total length of the exhaust vent pipe run must not exceed
one hundred (100) feet in 2" pipe, or one hundred fifty (150)
feet in 3" pipe.
Minimum - Maximum Vent Run Lengths
Diameter
Intake Air Pipe Run
Exhaust Vent Run
Table 13 - Minimum - Maximum Vent Runs
5. The equivalent length of elbows, tees, and other fittings are listed
in the Friction Loss Table below.
Friction Loss Equivalent in Piping and Fittings
Fittings or Piping
90 Degree Elbow*
45 Degree Elbow
Coupling
One Foot of Straight Pipe
Concentric Kit
Table 14 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult
Polypropylene venting instructions for friction loss and pressure drop
equivalents.
Vent Sizing Example
If the exhaust vent run has two 90
and a concentric kit we will calculate:
Exhaust Vent Equivalent Length = (2x5) + 10 + 3 = 23 feet - Well
below the maximum of 100 ft in 2" pipe, or 150 ft in 3" pipe.
If the intake air pipe run has one 90
feet of straight pipe:
Intake Air Pipe Equivalent Length = 5 + (2x3) + 14 = 25 feet - Well
below the maximum of 100 ft in 2" pipe, or 150 ft in 3" pipe.
NOTE: The intake air pipe and exhaust vent do not have to be of equal
length. There is no balancing requirement between intake and exhaust.
WARNING
Failure to install the boiler within the minimum and maximum vent
length requirements could result in improper product operation and
property damage, serious personal injury, or death.
F. Tightening Boiler Collar to Exhaust Vent and Intake Pipe
This boiler uses 2" or 3" diameter pipe for exhaust vent and intake pipe.
In order to use 3" pipe, it is required to increase pipe size in a vertical
length of pipe with a 3" x 2" reducing coupling (not included).
Follow the steps to install exhaust vent pipe into the boiler vent
collar. See Figure 30 for additional details.
NOTE: Clean and dry the boiler connection.
DO NOT use primer or cement on the boiler connection.
2" 3"
0 - 100 feet 0 - 150 feet
6 - 100 feet 6 - 150 feet
Equivalent Feet
2" or 3"
5'
3'
0'
1'
3'
o
elbows, 10 feet of straight pipe
o o
elbow, two 45 elbows, and 14
When preparing pipe for installation:
• Ensure cuts are square.
• Bevel cut edges by 1/16" - 1/8". Deburr the pipe.
• Lubricate the gasket.
1. Push the length of pipe into the connection until it touches the
bottom of the fitting.
2. Tighten the clamps using a screwdriver.
3. Ensure the pipe is secure before continuing installation.
4. For 3" installations, install the reducing coupling in a vertical section
of pipe.
WARNING
When venting with PVC, first install the included 5.5" length of 2" CPVC
into the boiler's exhaust connection, then adapt to PVC using approved
CPVC to PVC transition cement. Installing PVC pipe into the boiler's
exhaust connection is strictly prohibited - the strain of the gear clamp
combined with heat can deform PVC over time and result in flue gas
leakage causing property damage, severe personal injury, or death.
Figure 30 - Correct Installation into the Appliance Collar
NOTE: INCREASING VENT SIZE: TRANSITIONING FROM 2" TO 3" VENT
PIPE MUST ALWAYS TAKE PLACE IN A VERTICAL POSITION TO PREVENT
CONDENSATE BLOCKAGE. See Figure 31.
Figure 31 - Transitioning from 2" to 3" Vent Pipe
Follow the steps below to install air intake pipe into the boiler air
intake connection. See Figure 32 for additional details.
NOTE: Clean and dry the boiler connection.
DO NOT use primer or cement on the boiler connection.
Select an air intake connection (left or right of the exhaust vent collar).
See Figure 32.
1. Using a utility knife, cut out the plastic covering the air intake
connection from the side chosen. NOTE: DO NOT CUT OUT BOTH
SIDES! See Figure 32.
Figure 32 - Cut Out Plastic Covering the Air Intake Connection
Part 5 - Venting
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