Connecting The Power Supply; Setting The Dip Switches; Circuit Board Dip Switches - Navien NPE-180A2 Installation Manual

3.7 Connecting the Power Supply

WARNING
Improperly connecting the power supply can
result in electrical shock and electrocution.
Follow all applicable electrical codes 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 USA or the latest edition of CSA C22.1
Canadian Electrical Code Part 1 in Canada.
Connecting the power supply should be
performed only by a licensed professional.
When connecting the power supply, follow these
guidelines:
Do not connect the electric supply until all
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plumbing and gas piping is complete and the
water heater has been filled with water.
Do not connect the water heater to a 220 - 240 V
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AC power supply. Doing so will damage the water
heater and void the warranty.
All water heaters come with a factory-installed,
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3-pronged (grounded) plug. The water heater can
be plugged into any grounded electrical outlet
nearby, as it requires only 2 - 4 Amps. It is not
necessary to run a dedicated electrical line to the
water heater.
Keep power cord free of dust.
●
Do not use a broken or modified power cord.
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Do not bind, bend or stretch power cords.
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If local codes require the water heater to be
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wired directly, remove and discard the factory-
installed plug. Install a power switch between
the breaker and the water heater to facilitate
end-user maintenance and servicing. Connect
the water heater to a 110 - 120 V AC at 60 Hz with
a maximum of 2 A (4 A if an external pump is
connected) rating electrical supply.
The water heater must be electrically grounded.
●
If using the power plug, ensure that the electrical
outlet you connect the water heater to is properly
grounded. If wiring the water heater directly to
a power supply, do not attach the ground wire
to either the gas or the water piping as plastic
pipe or dielectric unions may prevent proper
grounding.
58 Installing the Water Heater
We recommend using a surge protector to
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protect the water heater from power surges.
If there is a power failure in cold weather areas,
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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 water heater 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 temperatures due to power loss is not
covered under warranty.
The use of extension codes is not recommended.
●
If you are not using your water heater for a long
period of time:
1. Completely drain the water out of the water
heater.
2. Disconnect the power supply to the water
heater. This prevents your water heater from
freezing and being damaged.
CAUTION
Label all wires before disconnecting them
when you work on the controls. Wiring errors
can cause improper and dangerous operation.
Verify proper operation after servicing.

3.8 Setting the DIP Switches

The water heater has two DIP switch locations:
on the main circuit board (PCB) and on the front
panel. Each location has DIP switches that control
the functionality of the water heater. Set the DIP
switches appropriately, based on the installation
environment.

3.8.1 Circuit Board DIP Switches

The two DIP switches on the circuit board configure
the water heater's model settings. These configurations
are set at the factory and should not be changed.