Installation Sheet

Rinnai Tankless Water Heater Installaon and Operaon Manual 41
When installing PVC/CPVC Common Vent, follow these guidelines:
• Avoid sharp bends or tees in the vent system.
These vent components create addional
restricons that could reduce performance of
the water heaters.
• PVC combuson air and exhaust should
terminate with elbow or tee poinng down.
This will stop unwanted moisture from entering
the vent system.
• Fire rated penetraons shall be restopped.
Contact your vent supplier or local restop
manufacturer for appropriate restop
methods.
• Examine all vent components for damage prior to
installaon.
• PVC/CPVC vent systems must be free to expand and
contract. Refer to the vent manufacturer’s installaon
instrucons for appropriate support methods.
• PVC/CPVC venng must include unrestricted vent
movement through walls, ceilings, and roof
penetraons.
• Use only PVC/CPVC primer and cement approved for
use by the vent manufacturer.
• Refer to vent manufacturer’s installaon instrucons
for proper joint assembly procedures and products.
• PVC/CPVC common venng 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. See “PVC/CPVC
Common Vent Installaon” illustraon on this page.
• 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.
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.
WARNING
DO NOT
DO NOT mix vent pipe, ngs or joining methods
from dierent vent manufacturers.
DO NOT aempt to repair damaged vent. Dam-
aged vent components must be replaced.
DO NOT use short radius elbows in the common
vent system.
ACCEPTABLE ACCEPTABLE NOT ACCEPTABLE
90° Elbows,
Long Sweep
90° Elbows,
Short Sweep
90° Elbows,
Close Turn
HEADER
VENT
PVC/CPVC Common Vent Installaon
Schedule 40 PVC/CPVC Common Vent Guidelines