26
LP-520 REV. 5.1.17
• 2.5 feet (.75M) for each additional 3” 45
o
elbow
• 8 feet (2.4M) for each additional 2” 90
o
elbow
• 4 feet (1.2M) for each additional 2” 45
o
elbow
• Some terminations are considered elbows, and deduction should be applied. For example, a turndown 90
o
or an
open T termination should be considered a 90
o
elbow.
• For 2” diameter installations, install a reducing coupling in a vertical section of pipe ABOVE the pipe clamp installed
on the water heater. See Figure 8.
b. For example: If the 2” exhaust vent has two 90
o
elbows and 10 feet of PVC pipe we will calculate: Exhaust Vent Equivalent
Length = (2x8) + 10 = 26 feet.
Further, if the 2” intake pipe has one 90
o
elbow, one 45
o
elbow, and 10 feet of PVC pipe, the following calculation applies:
Intake Pipe Equivalent Length = 8 + 4 + 10 = 22 feet.
The Exhaust Vent Equivalent Length + the Intake Pipe Equivalent Length equal the Total Equivalent Length. In this example,
the Total Equivalent Length is 48 feet.
c. The minimum Total Equivalent Length is fourteen (14) feet (4.2M).
NOTE: The intake pipe and exhaust vent lengths do not have to be of equal length. There is no balancing requirement between intake
and exhaust.
Vent adaptors are not designed as load-bearing devices, and must not be used to support exhaust vent piping. All vent pipes must be
properly connected, supported, and the exhaust must be pitched a minimum of ¼” per foot back to the boiler to allow drainage of
condensate. Failure to properly support vent piping and follow the information in this statement could result in product damage, severe
personal injury, or death.
Failure to provide a minimum total vent length of 14 equivalent feet could result in property damage and improper appliance operation.
D. TIGHTENING APPLIANCE COLLAR TO EXHAUST VENT AND INTAKE PIPE
NOTE: The included 6” length of 3” CPVC pipe MUST BE INSTALLED in the exhaust vent connection BEFORE venting the appliance.
Failure to properly install the included 6” length of 3” CPVC pipe BEFORE venting the appliance could result in product damage, severe
personal injury, or death.
This appliance uses 2” or 3” diameter pipe for exhaust vent and intake pipe. In order to use 2” pipe, it is required to reduce pipe size in
a vertical length of pipe with a reducing coupling (not included). Follow the steps below to install 2” or 3” pipe into the appliance collar.
See Figure 11 for additional details.
1. Clean and dry the appliance connection. DO NOT use primer or cement on the appliance connection.
2. Push the included 6” length of CPVC pipe into the connection until it touches the bottom of the fitting.
3. Tighten the clamps using a screwdriver.
4. Ensure the pipe is secure before continuing installation.
5. For 2” installations, install a reducing coupling in a vertical section of pipe. See Figure 12.
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