NTI INSTALLATION MANUALS

Part 5 - Venting

F. Tightening Boiler Collar to Exhaust Vent and Intake Pipe

E. Exhaust Vent and Intake Pipe Sizing

Follow the steps to install exhaust vent pipe into the boiler vent collar. See Figure 22 for additional details. NOTE: Clean and dry the boiler connection. DO NOT use primer or cement on the boiler connection. 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 tting. 2. Tighten the clamps using a screwdriver. 3. Ensure the pipe is secure before continuing installation. NOTE: To install intake pipe, follow the steps for installing exhaust vent pipe.

1. All models ship with 3” diameter vent pipe exhaust vent and intake air pipe connections. a. Vent diameter may be DECREASED to 2”. b. Increasing the vent diameter IS NOT an option. 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 2” 3” Intake Air Pipe Run 0 - 100 feet 0 - 150 feet Exhaust Vent Run 6 - 100 feet 6 - 150 feet

WARNING

When venting with PVC, Àrst install the included 5” length of 3” 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 Áue gas leakage causing property damage, severe personal injury, or death.

Table 14 - Minimum - Maximum Vent Runs

5. The equivalent length of elbows, tees, and other ttings are listed in the Friction Loss Table below.

Friction Loss Equivalent in Piping and Fittings

Equivalent Feet 2” or 3”

Fittings or Piping

5’

90 Degree Elbow*

3’

45 Degree Elbow

0’

Coupling

1’

One Foot of Straight Pipe

3’

Concentric Kit

Figure 22 - Correct Installation into the Appliance Collar

Vent Sizing Example If the exhaust vent run has two 90 o elbows, 10 feet of straight pipe 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 o elbow, two 45 o elbows, and 14 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. Table 15 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult Polypropylene venting instructions for friction loss and pressure drop equivalents.

Reducing Vent Diameter In order to use 2” pipe, it is required to reduce pipe size in a vertical length of pipe with a 3” x 2” reducing coupling (not included). NOTE: A reducing coupling MUST BE USED when transitioning from 3” to 2” vent pipe. DO NOT use reducing bushings.

Figure 23 - Correct Installation into the Appliance Collar

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.

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