LP-719 Rev. 000 Rel. 000 Date 6.25.20
33
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 13 - 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
Follow the steps to install exhaust vent pipe into the boiler vent
collar. See
Figure
21 for additional details.
NOTE:
Clean and dry the boiler connection.
DO NOT use primer or cement on the boiler connection.
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. All models ship with 3” diameter vent pipe exhaust vent and intake
air pipe connections.
a. All 150 Models - Vent diameter may be DECREASED to 2”.
b. 199 / 199C Models must be vented in 3” diameter pipe.
c. Increasing the vent diameter of ANY model boiler 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
Figure 21 - Correct Installation into the Appliance Collar
When venting with PVC, first 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 flue gas leakage causing property damage,
severe personal injury, or death.
WARNING
!
5. The equivalent length of elbows, tees, and other fittings are listed in
the Friction Loss Table below.
Table 14 - *Friction loss for long radius elbow is 1 foot less. NOTE: Consult
Polypropylene venting instructions for friction loss and pressure drop
equivalents.
WARNING
!
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.
NOTE:
To install intake pipe, follow the steps for installing exhaust
vent pipe.
G. Exhaust Vent and Intake Pipe Installation
All joints of positive pressure vent systems must be sealed
completely to prevent leakage of flue products into the living
space. Failure to do so could result in property damage, serious
injury, or death.
WARNING
!
1. Use only solid PVC, CPVC, or stainless steel pipe or a
Polypropylene vent system approved for use with Category IV
appliances.
ABS pipe material may be used on air inlet piping
only
.
2. Remove all burrs and debris from joints and fittings.
3. When using PVC or CPVC pipe, all joints must be properly
cleaned, primed, and cemented. Use only cement and primer
approved for use with the pipe material. Cement must conform
to ASTM D2564 for PVC and ASTM F493 for CPVC pipe.
NOTE:
DO NOT CEMENT POLYPROPYLENE PIPE.
4. Ensure the vent is located where it will not be exposed to
prevailing winds.
5. In all roof venting applications, exhaust discharge must point
away from the pitch of the roof.
6. If the exhaust vent is to be terminated in a walled off area
Figure 22 - Air Intake Pipe Installed (Left Side Installation
Demonstrated)
Reducing Vent Diameter - 150 Models ONLY!
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.
