Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 4
Thank you for purchasing Rinnai’s Demand
Duo™ H-Series Commercial Hybrid Water
Heating System. This manual provides
information on the installation, operation, and
maintenance of Rinnai’s Demand Duo™ H-Series
Commercial Hybrid Water Heating System. Read
this manual completely before installing or
operating the system.
This manual is a supplement to the
Installation and Operation Manual for
Condensing Tankless Water Heaters; refer to
the tankless water heater installation and
operation manual for complete water heater
details, including:
• Parameter Settings (High Altitude
Adjustment, Vent Length Adjustment, and
more)
• Temperature Controller Installation
• Performance Data
• Diagnostic Codes
• A trained and qualified professional must
install the system, inspect it, and leak test it
before use. The warranty may be voided due
to any improper installation.
• The trained and qualified professional should
have skills such as:
− Gas line sizing
− Connecting gas lines, water lines, valves,
and electricity
− Knowledge of applicable national, state,
and local codes
− Installing venting through a wall or roof
− Training in installation of tankless water
heaters. Training on Rinnai Tankless
Water Heaters is accessible at
www.trainingevents.rinnai.us.
• Read all instructions in this manual before
installing the system. The system must be
installed according to the exact instructions in
this manual.
• Proper installation is the responsibility of the
installer.
• When installation is complete, leave this
manual with the system or give the manual
directly to the consumer.
• You must read the entire manual to
properly operate the water heater and to
have regular maintenance performed.
• Keep this manual for future reference.
• As when using any appliance generating
heat, there are certain safety precautions
you should follow. See the Safety
Precautions section for detailed safety
precautions.
• Be sure your water heater is installed by a
trained and qualified professional.
• If installing in the state of Massachusetts,
you must read the Massachusetts State
Gas Regulations section in the tankless
water heater installation and operation
manual (supplied with tankless water
heater).
For Your Records
Dealer Name:
Dealer Phone #:
Purchase Date:
Tank Serial #:
System Serial #:
Tank Serial
Number Label
System Serial
Number Label