Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 4
Thank you for purchasing Rinnai’s Demand
Duo™ 2 Commercial Hybrid Water Heating
System.
This manual provides information on the
installation, operation, and maintenance of the
system. Read this manual completely before
installing or operating the system.
This manual is a supplement to the Installation
and Operation Manual for Commercial CU199
and CU160 Condensing Tankless Water Heaters;
refer to the CU199/CU160 manual for complete
water heater information.
For Your Records
Dealer Name:
Dealer Phone #:
Purchase Date:
Demand Duo™ 2 Serial #:
Rack Serial #:
Demand Duo™ 2
Serial # and Rack
Serial # located on
side of rack frame
leg.
• A trained and qualified professional must
install the system, inspect it, and leak test it
before use. The warranty will 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
licensed installer.
• 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).
Demand Duo™ 2
Serial # and Tank
Serial # located on
the tank on the left
of the tankless
water heater.