Connecting The Power Supply; Setting The Dip Switches - Navien NPE-180A 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 plumbing and gas
piping is complete and the water heater has been filled with
water.
Do not connect the water heater to a 220-240V AC power
supply. Doing so will damage the water heater and void the
warranty.
All water heaters come with a factory-installed, 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.
If local codes require the water heater to be 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 110-120V AC at 60 Hz with a maximum of 2A (4A 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.
We recommend using a surge protector to protect the water
heater from power surges.
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 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 is
not covered under warranty.
34 Installing the Water Heater

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 two sets
of 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 sets of 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.
3.8.2 Setting the Front Panel DIP Switches
The two sets of DIP switches on the front panel configure the water
heater's pump & recirculation, display, well pump, storage tank &
solar system, lime alarm, high altitude, Cascade Venting and Gas
Type settings. Some of these configurations are set at the factory
and should not be changed. The following tables describe the
functions of the DIP switches and their settings:
ON
1 2 3 4 5
ON
6 7 8 9 10