28
Installation Manual
Vent Type
All water heaters are prepared at the factory to be direct vent
(sealed combustion) water heaters that draw all of their required
combustion air directly from outside the building. VST recommends
direct air vent installations whenever possible to avoid back drafting
cold air through the water heater. VST recommends direct air vent
installations when installing the water heater in your attic to get
fresh air into the water heater. If you cannot use a direct vent, ensure
that an ample supply of make-up air is available in the installation
location. VST also recommends installing a new vent system with
this appliance. If reusing an existing vent system, thoroughly inspect
it for punctures, cracks, or blockages prior to connecting it to the
water heater. When using non-direct venting, must provide two
openings as specified in the table on page 28.
Direct
The water heater uses 2" or 3" diameter exhaust and 2" or 3"
diameter intake air ducts. To ensure the draw of air directly from
and exhaust of air directly to the outside of the building, create an
airtight seal from the water heater collar to the vent termination.
Intake materials can be made of ABS, PVC, CPVC, PP, galvanized
steel, corrugated aluminum or any other similar materials. If you use
a corrugated material, ensure that there is not inadvertent crimping
of, or damage to, the intake air pipe.
When using direct venting, maintain the following venting
clearances, as required by ANSI Z21.10.3 and the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, and CAN/CGA B149.1 Natural Gas and
Propane Installation Code.
VRP/VRS water heater have back flue damper in the appliance.
Then, Common venting is only US permitted. Common venting
systems shall be in accordance with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or the CSA B149.1, Natural Gas and
Propane Installation Code(Current Editions), local codes, and this
instructions.
To use direct venting for the water heater:
• Install the 2" vent directly. Ensure the vent is properly seated.
• To install the 3" vent, reducer (3" to 2") must be used.
• Install the reducer (3" to 2") vertically. If installed horizontally,
water may stagnate.
2" PVC Pipe
3" PVC Pipe
3" Elbow
Reducer (3" → 2")
2" Elbow
Condensation
pooling
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