420010970304 - LP-700 Rev. 000 Rel. 002 Date 4.21.21
37
Friction Loss Equivalent in Piping and Fittings
Fittings or Piping
Equivalent Feet
2” or 3”
90 Degree Elbow*
5’
45 Degree Elbow
3’
Coupling
0’
Air Inlet Tee
0’
One Foot of Straight Pipe
1’
Concentric Kit
3’
V Series Vent Kit
1’
AL29-4C Vent Terminal
1’
Table 14 - Minimum - Maximum Vent Runs
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.
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.
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.
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.
Figure 30 - Correct Installation into the Appliance Collar
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.
WARNING
!
Figure 31 - Transitioning from 2” to 3” Vent Pipe
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.
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
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
5. The equivalent length of elbows, tees, and other fittings are listed
in the Friction Loss Table below.
Table 15 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult
Polypropylene venting instructions for friction loss and pressure drop
equivalents.
WARNING
!
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 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.
