Electrical Connections - Navien NR-180 Installation Manual

Gas Water Heater Installation

█ Electrical Connections:

Follow the electrical code requirements of the local authority having jurisdiction. In
the absence of such requirements, follow the latest edition of the National Electrical
Code (NFPA 70) in the U.S. or the latest edition of CGA C22.1 Canadian Electrical
Code - Part 1 in Canada.
Electric Wiring: Grounding and Surges
 All units come with a factory installed 3-pronged (grounded) plug end. The Water Heater
can be plugged into any electrical outlet close to the unit as it requires only 2 Amperes. It
is not necessary to run a dedicated electrical line to the water heater.
 If the local jurisdiction requires the unit to be wired directly, remove and discard the
factory installed plug. An on/off switch controlling the main power between the breaker
and the Navien Water Heater should be provided to facilitate end-user maintenance and
servicing.
 The heater must be electrically grounded. Ensure the electical receptacle, in which the
water heater will be plugged into, is properly grounded; if wiring directly, do not attach the
ground wire to either the gas or the water piping as plastic pipe or dielectric unions may
isolate the water heater electrically.
 The use of a surge protector is recommended to protect from power surges.
 Do not plug electrical power to the unit until all plumbing and gas piping is
complete and the Water Heater has been filled with water.
 The electrical supply required by the Water Heater is 110~120VAC at 60 Hz with a
maximum 2 A rating.
 Do not connect 220~240V AC to this Navien Water Heater. It will damage the Water
Heater and this damage is not covered under warranty.
 Do not disconnect the power supply when the unit is in normal operation.
 If there is a power failure in cold weather areas, the freeze prevention system in the
water heater will not operate and may result in freezing of the heat exchanger; in cold
weather areas where power failures are common, you must completely drain the unit to
prevent damage if the power will be off for any extended period of time.
 A battery back-up (available at most computer retailers) may be used to supply hot water
during periods of power outages.
 Damage caused by freezing is not covered under warranty.
CAUTION
Label all wires prior to disconnection when servicing coltrols.
Wiring errors can cause improper and dangerous operation.
Verify proper opation after servicing.
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