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WARNING
extremely flammable. Vapors may cause a
flash fire or explosion resulting in property
damage, personal injury or death.
•
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 restrictions that could reduce
performance of the water heaters.
•
PVC combustion air and exhaust should
terminate with elbow or tee pointing down.
This will stop unwanted moisture from
entering the vent system.
•
Fire rated penetrations shall be fire stopped.
Contact your vent supplier or local firestop
manufacturer 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
manufacturer'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
approved for use by the vent manufacturer.
Demand Duo
H-Series with SENSEI CX Installation Instructions
PVC solvents (primer
and glue) can be
•
Refer to vent manufacturer's installation
instructions 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. See "PVC/CPVC Common
Vent Installation" illustration on this page.
Figure 41
HEADER
PVC/CPVC Common Vent Installation
DO NOT
DO NOT mix vent pipe, fittings or joining
methods from different vent manufacturers.
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 18
ACCEPTABLE
90° Elbows, Long
Sweep
NOT ACCEPTABLE
90° Elbows,
Close Turn
VENT
ACCEPTABLE
90° Elbows, Short
Sweep
36
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