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Installation
Installer qualifications: A trained and qualified professional must install the appliance, inspect it, and leak test the
Demand Duo™ before use. The warranty will be voided due to any improper installation. The trained and qualified
professional should have skills such as: Gas sizing; Connecting gas lines, water lines, valves, and electricity; Knowledge
of applicable national, state, and local codes; Installing venting through a wall or roof; and training in installation of
tankless water heaters. Training for Rinnai Tankless Water Heaters is accessible online at www.trainingevents.rinnai.us.
Installation Guidelines
When installing the Demand Duo™, follow these guidelines:
•
This water heater is suitable for combination water
heating and space heating and not suitable for space
heating applications only.
•
The installation must conform with local codes or, in
the absence of local codes, with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas
and Propane Installation Code, CSA B149.1.
•
The appliance, when installed, must be electrically
grounded in accordance with local codes or, in the
absence of local codes, with the National Electrical
Code, ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1.
•
The appliance and its main gas valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psi (3.5 kPa) (13.84 in
W.C.). For system testing at pressures less than or
equal to 1/2 psi (3.5 kPa) (13.84 in W.C.) the
appliance must be isolated from the gas supply
piping by closing its individual manual shutoff valve.
•
You must follow the installation instructions and
those in the venting section for adequate
combustion air and exhaust.
•
If a water heater is installed in a closed water supply
system, such as one having a backflow preventer in
the cold water supply line, means shall be provided
to control thermal expansion. Contact the water
supplier or local plumbing inspector on how to
control thermal expansion.
•
Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the
appliance.
•
Combustion air must be free of chemicals, such as
chlorine or bleach, that produce fumes. These fumes
can damage components and reduce the life of your
appliance.
8
THIS SECTION IS INTENDED FOR THE INSTALLER
Rinnai Commercial Hybrid System Installation and Operation Manual
DO NOT
DO NOT install the Demand Duo™ Commercial
Hybrid Water Heating System outdoors.
DO NOT install the water heater in an area
where water leakage of the unit or connections
will result in damage to the area adjacent to the
appliance or to lower floors of the structure.
When such locations cannot be avoided, it is
required that a suitable drain pan, adequately
drained, be installed under the water heater.
The pan must not restrict combustion air flow.
DO NOT install the water heater in an area with
negative air pressure.
DO NOT obstruct the flow of combustion and
ventilation air.
DO NOT use this appliance in an application
such as a pool or spa heater that uses
chemically treated water. This appliance is
suitable for filling large or whirlpool spa tubs
with potable water.
DO NOT use substitute parts that are not
authorized for this appliance.
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