Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 13
THIS SECTION IS INTENDED FOR THE
INSTALLER
Installer qualifications: A trained and qualified
professional must install the appliance, inspect it,
and leak test the Demand Duo™ 2 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.
• 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.
• You must follow the installation instructions
and those in the venting section for adequate
combustion air and exhaust.
When installing the Demand Duo™ 2, follow
these guidelines:
• DO NOT install the Demand Duo™ 2
outdoors.
• DO NOT install the Demand Duo™ 2 in an
area where water leakage of the unit or
connections will result in damage to the area
adjacent to the system or to lower floors of
the structure. When such locations cannot be
avoided, it is recommended that a suitable
drain pan, adequately drained, be installed
under the water heaters. The pan must not
restrict combustion air flow.
• DO NOT install the Demand Duo™ 2 in an
area with negative air pressure, where the
pressure inside is lower than the pressure
outside.
• DO NOT obstruct the flow of combustion and
ventilation air.
• DO NOT use the Demand Duo™ 2 in an
application such as a pool or spa heater that
uses chemically treated water. The Demand
Duo™ 2 is suitable for filling large or whirlpool
spa tubs with potable water.
• DO NOT use substitute parts that are not
authorized for this system.
• DO NOT connect power to the Demand
Duo™ 2 prior to completing installation and
the system has been filled with water.
• The appliance and its main gas valve must be
disconnected from the gas supply piping sys-
tem during any pressure testing of that sys-
tem 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.
• If a water heater is installed in a closed water
supply system, such as one having a back-
flow 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 compo-
nents and reduce the life of your appliance.
Topics in this section
• Guidelines
• Typical Installations
• Confirm Shipping Contents
• What You Will Need
• Choose an Installation Location