Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 32
Shut off building supply power prior to
connecting to the electrical assembly. Failure to
do so may result in property damage, bodily
harm, or death.
a. Locate the gang box on top of the storage
tank.
1. A 4-unit electrical assembly is pre-installed on
the storage tank for single point electrical
connection (Refer to the Specifications
sections in this manual for electrical
requirements.
Connect power to the electrical assembly by
following the steps below.
4-Unit
Electrical Assembly
with (2) 20 A, 125
V, 2-Pole, 3-Wire
Grounding
Receptacles
WARNING
• Do not use an extension cord or adapter plug
with this appliance.
• The water heater must be electrically
grounded in accordance with local codes and
ordinances or, in the absence of local codes,
in accordance with the National Electrical
Code, ANSI/NFPA No. 70.
• Indoor water heaters are equipped with a
three-prong (grounding) plug for your
protection against shock hazard and should
be plugged directly into a properly grounded
three-prong receptacle. Do not cut or remove
the grounding terminal from this plug.
When connecting the power supply, follow these
guidelines:
• Do not rely on the gas or water piping to
ground the water heater. Ground locations
are provided inside the water heater.
• Do not exceed the limits of the 15A circuit.
• The water heater requires 120 VAC, 60 Hz
power from a properly grounded circuit.
• Do not connect power to the Demand Duo™
2 system prior to completing installation and
filling the system with water.
• The Tankless Water Heater wiring diagram is
located on the inside of the water heater front
cover. The controller wiring diagram is
located on the inside front cover of the
controller.
• When power is supplied, the digital controller
maintains pump operation. If the Demand
Duo™ 2 system is not in use for an extended
period of time, disconnect power from the
system.
To connect the power supply:
WARNING