Rinnai Sensei CU199i Installation And Operation Manual page 51

Schedule 40 PVC/CPVC Common Vent Guidelines
WARNING
• Keep solvents away from heat, sparks, flames and all other sources of ignition.
• Do not solder, cut or weld until all vapors have dissipated.
• PVC solvents are heavier than air causing them to settle at low points of the system.
• Before Using PVC solvent
– Disconnect power to the water heater.
– Remove the front cover of the water heater.
– Ensure areas around the water heater and PVC venting are all well ventilated.
– Allow all vapors to dissipate before applying power to the system or introducing any other
source of ignition.
When installing PVC/CPVC Common Vent, follow these guidelines:
• Avoid sharp bends or tees in the vent system.
These vent components create additional re-
strictions that could reduce performance of the
water heaters.
• PVC combustion air and exhaust should termi-
nate with elbow or tee pointing down. This will
stop unwanted moisture from entering the vent
system.
• Fire rated penetrations shall be firestopped.
Contact your vent supplier or local firestop man-
ufacturer for appropriate firestop methods.
• Examine all vent components for damage prior
to installation.
• PVC/CPVC vent systems must be free to
expand and contract. Refer to the vent manu-
facturer's installation instructions for appropriate
support methods.
• PVC/CPVC venting must include unrestricted
vent movement through walls, ceilings, and roof
penetrations.
• Use only PVC/CPVC primer and cement ap-
proved for use by the vent manufacturer.
• Refer to vent manufacturer's installation instruc-
tions for proper joint assembly procedures and
products.
• PVC/CPVC common venting should include a
condensate drain and trap between the header
and vent length. Condensate trap must include
a loop that can hold 6 in. (15 cm) of water.
Refer to the Rinnai Common Vent Installation
manual for more information.
Rinnai Tankless Water Heater Installation and Operation Manual
PVC solvents (primer and glue) can be extremely flammable. Vapors may
cause a flash fire or explosion resulting in property damage, personal injury
or death.
Header
Figure 50: PVC/CPVC Common Vent
Installation
DO NOT
• Do not mix vent pipe, fittings or joining
methods from different vent manufactur-
ers.
• DO NOT attempt to repair damaged
vent. Damaged vent components must
be replaced.
• DO NOT use short radius elbows in the
common vent system.
Table 23
Acceptable Acceptable
90° Elbows, 90° Elbows,
Long Sweep Short Sweep
Vent
Not
Acceptable
90° Elbows,
Close Turn
51