NTI INSTALLATION MANUALS

Part 5 - Venting

When preparing pipe for installation: • Ensure cuts are square. •

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 fty (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 fty (150) feet in 3” pipe.

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. 4. For 3” installations, install the reducing coupling in a vertical section of pipe.

WARNING

When venting with PVC, rst 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 ue gas leakage causing property damage, severe personal injury, or death.

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

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

90 Degree Elbow*

5’

Figure 30 - Correct Installation into the Appliance Collar

45 Degree Elbow

3’

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.

Coupling

0’

One Foot of Straight Pipe

1’

Concentric Kit

3’

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.

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.

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.

Figure 32 - Cut Out Plastic Covering the Air Intake Connection

40